Organic matter is of emerging interest as a control on molybdenum (Mo) biogeochemistry, and information on isotope fractionation during adsorption to organic matter can improve interpretations of Mo isotope variations in natural settings. Molybdenum isotope fractionation was investigated during adsorption onto insolubilized humic acid (IHA), a surrogate for organic matter, as a function of time (2–170 h) and pH (2–7). For the time series experiment performed at pH 4.2, the average Mo isotope fractionation between the solution and the IHA (Δ98Mosolution-IHA) was 1.39‰ (± 0.16‰, 2σ, based on 98Mo/95Mo relative to the NIST 3134 standard) at steady state. For the pH series experiment, Mo adsorption decreased as pH increased from 2.0 to 6.9, and the Δ98Mosolution-IHA increased from 0.82‰ to 1.79‰. We also evaluated natural Mo isotope patterns in precipitation, foliage, organic horizon, surface mineral soil, and bedrock from 12 forested sites in the Oregon Coast Range. The average Mo isotope offset observed between precipitation and organic (O) horizon soil was 2.1‰, with light Mo isotopes adsorbing preferentially to organic matter. Fractionation during adsorption to organic matter is similar in magnitude and direction to prior observations of Mo fractionation during adsorption to Fe- and Mn- (oxyhydr)oxides. Our finding that organic matter influences Mo isotope composition has important implications for the role of organic matter as a driver of trace metal retention and isotopic fractionation.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.gca.2017.11.014","usgsCitation":"King, E., Perakis, S.S., and Pett-Ridge, J.C., 2018, Molybdenum isotope fractionation during adsorption to organic matter: Geochimica et Cosmochimica Acta, v. 222, p. 584-598, https://doi.org/10.1016/j.gca.2017.11.014.","productDescription":"15 p.","startPage":"584","endPage":"598","ipdsId":"IP-087758","costCenters":[{"id":289,"text":"Forest and Rangeland Ecosys Science Center","active":true,"usgs":true}],"links":[{"id":469152,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1016/j.gca.2017.11.014","text":"Publisher Index Page"},{"id":349646,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"222","publishingServiceCenter":{"id":12,"text":"Tacoma PSC"},"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a60fad6e4b06e28e9c22780","contributors":{"authors":[{"text":"King, Elizabeth K.","contributorId":146931,"corporation":false,"usgs":false,"family":"King","given":"Elizabeth K.","affiliations":[{"id":6680,"text":"Oregon State University","active":true,"usgs":false}],"preferred":false,"id":724312,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Perakis, Steven S. 0000-0003-0703-9314 sperakis@usgs.gov","orcid":"https://orcid.org/0000-0003-0703-9314","contributorId":145528,"corporation":false,"usgs":true,"family":"Perakis","given":"Steven","email":"sperakis@usgs.gov","middleInitial":"S.","affiliations":[{"id":289,"text":"Forest and Rangeland Ecosys Science Center","active":true,"usgs":true},{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"preferred":true,"id":724311,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Pett-Ridge, Julie C.","contributorId":172441,"corporation":false,"usgs":false,"family":"Pett-Ridge","given":"Julie","email":"","middleInitial":"C.","affiliations":[{"id":6680,"text":"Oregon State University","active":true,"usgs":false}],"preferred":false,"id":724313,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70194515,"text":"70194515 - 2018 - Estimating the per-capita contribution of habitats and pathways in a migratory network: A modelling approach","interactions":[],"lastModifiedDate":"2018-04-27T16:47:13","indexId":"70194515","displayToPublicDate":"2017-12-01T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1445,"text":"Ecography","active":true,"publicationSubtype":{"id":10}},"title":"Estimating the per-capita contribution of habitats and pathways in a migratory network: A modelling approach","docAbstract":"Every year, migratory species undertake seasonal movements along different pathways between discrete regions and habitats. The ability to assess the relative demographic contributions of these different habitats and pathways to the species’ overall population dynamics is critical for understanding the ecology of migratory species, and also has practical applications for management and conservation. Metrics for assessing habitat contributions have been well-developed for metapopulations, but an equivalent metric is not currently available for migratory populations. Here, we develop a framework for estimating the demographic contributions of the discrete habitats and pathways used by migratory species throughout the annual cycle by estimating the per capita contribution of cohorts using these locations. Our framework accounts for seasonal movements between multiple breeding and non-breeding habitats and for both resident and migratory cohorts. We illustrate our framework using a hypothetical migratory network of four habitats, which allows us to better understand how variations in habitat quality affect per capita contributions. Results indicate that per capita contributions for any habitat or pathway are dependent on habitat-specific survival probabilities in all other areas used as part of the migratory circuit, and that contribution metrics are spatially linked (e.g. reduced survival in one habitat also decreases the contribution metric for other habitats). Our framework expands existing theory on the dynamics of spatiotemporally structured populations by developing a generalized approach to estimate the habitat- and pathway-specific contributions of species migrating between multiple breeding and multiple non-breeding habitats for a range of life histories or migratory strategies. Most importantly, it provides a means of prioritizing conservation efforts towards those migratory pathways and habitats that are most critical for the population viability of migratory species.
","language":"English","publisher":"Wiley","doi":"10.1111/ecog.02718","usgsCitation":"Wiederholt, R., Mattsson, B.J., Thogmartin, W.E., Runge, M.C., Diffendorfer, J.E., Erickson, R.A., Federico, P., Lopez-Hoffman, L., Fryxell, J., Norris, D.R., and Sample, C., 2018, Estimating the per-capita contribution of habitats and pathways in a migratory network: A modelling approach: Ecography, v. 41, no. 5, p. 815-824, https://doi.org/10.1111/ecog.02718.","productDescription":"10 p.","startPage":"815","endPage":"824","ipdsId":"IP-076968","costCenters":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"links":[{"id":349625,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"41","issue":"5","publishingServiceCenter":{"id":6,"text":"Columbus PSC"},"noUsgsAuthors":false,"publicationDate":"2017-08-21","publicationStatus":"PW","scienceBaseUri":"5a60faf7e4b06e28e9c22a32","contributors":{"authors":[{"text":"Wiederholt, Ruscena","contributorId":149125,"corporation":false,"usgs":false,"family":"Wiederholt","given":"Ruscena","affiliations":[{"id":17653,"text":"School of Natural Resources & the Environment, The University of Arizona, Tucson","active":true,"usgs":false}],"preferred":false,"id":724217,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Mattsson, Brady J.","contributorId":201057,"corporation":false,"usgs":false,"family":"Mattsson","given":"Brady","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":724218,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Thogmartin, Wayne E. 0000-0002-2384-4279 wthogmartin@usgs.gov","orcid":"https://orcid.org/0000-0002-2384-4279","contributorId":2545,"corporation":false,"usgs":true,"family":"Thogmartin","given":"Wayne","email":"wthogmartin@usgs.gov","middleInitial":"E.","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true},{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"preferred":true,"id":724216,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Runge, Michael C. 0000-0002-8081-536X mrunge@usgs.gov","orcid":"https://orcid.org/0000-0002-8081-536X","contributorId":3358,"corporation":false,"usgs":true,"family":"Runge","given":"Michael","email":"mrunge@usgs.gov","middleInitial":"C.","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"preferred":true,"id":724219,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Diffendorfer, Jay E. 0000-0003-1093-6948 jediffendorfer@usgs.gov","orcid":"https://orcid.org/0000-0003-1093-6948","contributorId":55137,"corporation":false,"usgs":true,"family":"Diffendorfer","given":"Jay","email":"jediffendorfer@usgs.gov","middleInitial":"E.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":false,"id":724220,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Erickson, Richard A. 0000-0003-4649-482X rerickson@usgs.gov","orcid":"https://orcid.org/0000-0003-4649-482X","contributorId":5455,"corporation":false,"usgs":true,"family":"Erickson","given":"Richard","email":"rerickson@usgs.gov","middleInitial":"A.","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":true,"id":724221,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Federico, Paula","contributorId":201058,"corporation":false,"usgs":false,"family":"Federico","given":"Paula","email":"","affiliations":[],"preferred":false,"id":724222,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Lopez-Hoffman, Laura","contributorId":149127,"corporation":false,"usgs":false,"family":"Lopez-Hoffman","given":"Laura","affiliations":[{"id":17654,"text":"School of Natural Resources & the Environment and Udall Center for Studies in Public Policy, The University of Arizona, Tucson","active":true,"usgs":false}],"preferred":false,"id":724223,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Fryxell, John","contributorId":201059,"corporation":false,"usgs":false,"family":"Fryxell","given":"John","email":"","affiliations":[],"preferred":false,"id":724224,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Norris, D. Ryan","contributorId":59734,"corporation":false,"usgs":true,"family":"Norris","given":"D.","email":"","middleInitial":"Ryan","affiliations":[],"preferred":false,"id":724225,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Sample, Christine","contributorId":201060,"corporation":false,"usgs":false,"family":"Sample","given":"Christine","email":"","affiliations":[],"preferred":false,"id":724226,"contributorType":{"id":1,"text":"Authors"},"rank":11}]}} ,{"id":70194517,"text":"70194517 - 2018 - Water guns affect abundance and behavior of bigheaded carp and native fish differently","interactions":[],"lastModifiedDate":"2022-10-31T16:29:25.595511","indexId":"70194517","displayToPublicDate":"2017-12-01T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1018,"text":"Biological Invasions","active":true,"publicationSubtype":{"id":10}},"title":"Water guns affect abundance and behavior of bigheaded carp and native fish differently","docAbstract":"Water guns have shown the potential to repel nuisance aquatic organisms. This study examines the effects of exposure to a 1966.4 cm3 seismic water gun array (two guns) on the abundance and behavior of Bighead Carp Hypophthalmichthys nobilis, Silver Carp H. molitrix (collectively referred to as bigheaded carp) and native fishes (e.g., Smallmouth Buffalo Ictiobus bubalus). Water guns were deployed in a channel that connects the Illinois River to backwater quarry pits that contained a large transient population of bigheaded carp. To evaluate the effect of water guns, mobile side-looking split-beam hydroacoustic surveys were conducted before, during and between replicated water gun firing periods. Water guns did not affect abundance of bigheaded carp, but abundance of native fish detected during the firing treatment was 43 and 34% lower than the control and water guns off treatments, respectively. The proximity of bigheaded carp to the water gun array was similar between the water guns on and water guns off treatments. In contrast, the closest detected native fish were detected farther from the water guns during the water guns on treatment (mean ± SE, 32.38 ± 3.32 m) than during the water guns off treatment (15.04 ± 1.59 m). The water gun array had a greater impact on native fish species than on bigheaded carp. Caution should be taken to the extrapolation of these results to other fish species and to fish exposed to water guns in different environments (e.g., reduced shoreline interaction) or exposure to a larger array of water guns, or for use of water guns for purposes other than a barrier.
","language":"English","publisher":"Springer","doi":"10.1007/s10530-017-1624-9","usgsCitation":"Rivera, J., Glover, D.C., Kocovsky, P., Garvey, J.E., Gaikowski, M., Jensen, N., and Adams, R.F., 2018, Water guns affect abundance and behavior of bigheaded carp and native fish differently: Biological Invasions, v. 20, no. 5, p. 1243-1255, https://doi.org/10.1007/s10530-017-1624-9.","productDescription":"13 p.","startPage":"1243","endPage":"1255","ipdsId":"IP-071514","costCenters":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"links":[{"id":349624,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Illinois","otherGeospatial":"Illinois River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -88.45021074393868,\n 41.34496407480228\n ],\n [\n -88.45021074393868,\n 41.341067466457446\n ],\n [\n -88.44097485665472,\n 41.341067466457446\n ],\n [\n -88.44097485665472,\n 41.34496407480228\n ],\n [\n -88.45021074393868,\n 41.34496407480228\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"20","issue":"5","publishingServiceCenter":{"id":6,"text":"Columbus PSC"},"noUsgsAuthors":false,"publicationDate":"2017-11-17","publicationStatus":"PW","scienceBaseUri":"5a60faf7e4b06e28e9c22a2f","contributors":{"authors":[{"text":"Rivera, Jose 0000-0003-3756-6860 jrivera@usgs.gov","orcid":"https://orcid.org/0000-0003-3756-6860","contributorId":201064,"corporation":false,"usgs":true,"family":"Rivera","given":"Jose","email":"jrivera@usgs.gov","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":true,"id":724236,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Glover, David C.","contributorId":178006,"corporation":false,"usgs":false,"family":"Glover","given":"David","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":724237,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Kocovsky, Patrick 0000-0003-4325-4265 pkocovsky@usgs.gov","orcid":"https://orcid.org/0000-0003-4325-4265","contributorId":150837,"corporation":false,"usgs":true,"family":"Kocovsky","given":"Patrick","email":"pkocovsky@usgs.gov","affiliations":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"preferred":true,"id":724238,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Garvey, James E.","contributorId":178007,"corporation":false,"usgs":false,"family":"Garvey","given":"James","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":724239,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Gaikowski, Mark P. 0000-0002-6507-9341 mgaikowski@usgs.gov","orcid":"https://orcid.org/0000-0002-6507-9341","contributorId":149357,"corporation":false,"usgs":true,"family":"Gaikowski","given":"Mark P.","email":"mgaikowski@usgs.gov","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":true,"id":724240,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Jensen, Nathan R.","contributorId":201065,"corporation":false,"usgs":false,"family":"Jensen","given":"Nathan R.","affiliations":[],"preferred":false,"id":724241,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Adams, Ryan F. 0000-0001-7299-329X rfadams@usgs.gov","orcid":"https://orcid.org/0000-0001-7299-329X","contributorId":5499,"corporation":false,"usgs":true,"family":"Adams","given":"Ryan","email":"rfadams@usgs.gov","middleInitial":"F.","affiliations":[{"id":344,"text":"Illinois Water Science Center","active":true,"usgs":true},{"id":24708,"text":"Lower Mississippi-Gulf Water Science Center","active":true,"usgs":true},{"id":5064,"text":"Southeast Regional Director's Office","active":true,"usgs":true}],"preferred":true,"id":724242,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70194490,"text":"70194490 - 2018 - The geomorphic legacy of water and erosion control structures in a semiarid rangeland watershed","interactions":[],"lastModifiedDate":"2018-03-26T14:28:05","indexId":"70194490","displayToPublicDate":"2017-11-30T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1425,"text":"Earth Surface Processes and Landforms","active":true,"publicationSubtype":{"id":10}},"title":"The geomorphic legacy of water and erosion control structures in a semiarid rangeland watershed","docAbstract":"Control over water supply and distribution is critical for agriculture in drylands where manipulating surface runoff often serves the dual purpose of erosion control. However, little is known of the geomorphic impacts and legacy effects of rangeland water manipulation infrastructure, especially if not maintained. This study investigated the geomorphic impacts of structures such as earthen berms, water control gates, and stock tanks, in a semiarid rangeland in the southwestern USA that is responding to both regional channel incision that was initiated over a century ago, and a more recent land use change that involved cattle removal and abandonment of structures. The functional condition of remnant structures was inventoried, mapped, and assessed using aerial imagery and lidar data. Headcut initiation, scour, and channel incision associated with compromised lateral channel berms, concrete water control structures, floodplain water spreader berms, and stock tanks were identified as threats to floodplains and associated habitat. Almost half of 27 identified lateral channel berms (48%) have been breached and 15% have experienced lateral scour; 18% of 218 shorter water spreader berms have been breached and 17% have experienced lateral scour. A relatively small number of 117 stock tanks (6%) are identified as structurally compromised based on analysis of aerial imagery, although many currently do not provide consistent water supplies. In some cases, the onset of localized disturbance is recent enough that opportunities for mitigation can be identified to alter the potentially damaging erosion trajectories that are ultimately driven by regional geomorphic instability. Understanding the effects of prior land use and remnant structures on channel and floodplain morphologic condition is critical because both current land management and future land use options are constrained by inherited land use legacy effects.
","language":"English","publisher":"Wiley","doi":"10.1002/esp.4287","usgsCitation":"Nichols, M.H., Magirl, C.S., Sayre, N., and Shaw, J.R., 2018, The geomorphic legacy of water and erosion control structures in a semiarid rangeland watershed: Earth Surface Processes and Landforms, v. 43, no. 4, p. 909-918, https://doi.org/10.1002/esp.4287.","productDescription":"10 p.","startPage":"909","endPage":"918","ipdsId":"IP-088934","costCenters":[{"id":128,"text":"Arizona Water Science Center","active":true,"usgs":true}],"links":[{"id":349587,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Arizona","otherGeospatial":"Buenos Aires National Wildlife Refuge","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -111.57440185546875,\n 31.43159261047983\n ],\n [\n -111.34506225585938,\n 31.43159261047983\n ],\n [\n -111.34506225585938,\n 31.81572994283835\n ],\n [\n -111.57440185546875,\n 31.81572994283835\n ],\n [\n -111.57440185546875,\n 31.43159261047983\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"43","issue":"4","publishingServiceCenter":{"id":14,"text":"Menlo Park PSC"},"noUsgsAuthors":false,"publicationDate":"2017-12-18","publicationStatus":"PW","scienceBaseUri":"5a60fafbe4b06e28e9c22a7b","contributors":{"authors":[{"text":"Nichols, Mary H.","contributorId":201006,"corporation":false,"usgs":false,"family":"Nichols","given":"Mary","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":724085,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Magirl, Christopher S. 0000-0002-9922-6549 magirl@usgs.gov","orcid":"https://orcid.org/0000-0002-9922-6549","contributorId":1822,"corporation":false,"usgs":true,"family":"Magirl","given":"Christopher","email":"magirl@usgs.gov","middleInitial":"S.","affiliations":[{"id":622,"text":"Washington Water Science Center","active":true,"usgs":true},{"id":128,"text":"Arizona Water Science Center","active":true,"usgs":true}],"preferred":true,"id":724084,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Sayre, N.F.","contributorId":201007,"corporation":false,"usgs":false,"family":"Sayre","given":"N.F.","email":"","affiliations":[],"preferred":false,"id":724086,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Shaw, Jeremy R.","contributorId":201008,"corporation":false,"usgs":false,"family":"Shaw","given":"Jeremy","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":724087,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70196037,"text":"70196037 - 2018 - Weekly summer diet of gray wolves (Canis lupus) in northeastern Minnesota","interactions":[],"lastModifiedDate":"2018-03-15T11:06:17","indexId":"70196037","displayToPublicDate":"2017-11-30T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":737,"text":"American Midland Naturalist","active":true,"publicationSubtype":{"id":10}},"displayTitle":"Weekly summer diet of gray wolves (Canis lupus) in northeastern Minnesota","title":"Weekly summer diet of gray wolves (Canis lupus) in northeastern Minnesota","docAbstract":"Wolves (Canis lupus) are opportunistic predators and will capitalize on available abundant food sources. However, wolf diet has primarily been examined at monthly, seasonal, or annual scales, which can obscure short-term responses to available food. We examined weekly wolf diet from late June to early October by collecting scats from a single wolf pack in northeastern Minnesota. During our 15 week study, nonungulate food types constituted 58% of diet biomass. Deer (Odocoileus virginianus) fawns were a major food item until mid-July after which berries (primarily Vaccinium and Rubus spp.) composed 56–83% of weekly diet biomass until mid-August. After mid-August, snowshoe hares (Lepus americanus) and adult deer were the primary prey. Weekly diet diversity approximately doubled from June to October as wolves began using several food types in similar proportions as the summer transitioned into fall. Recreational hunting of black bears (Ursus americanus) contributed to weekly wolf diet in the fall as wolves consumed foods from bear bait piles and from gut piles/carcasses of successfully harvested or fatally wounded bears. To our knowledge, we are the first to examine wolf diet via scat analysis at weekly intervals, which enabled us to provide a detailed description of diet plasticity of this wolf pack, as well as the rapidity with which wolves can respond to new available food sources.
","language":"English","publisher":"University of Notre Dame","doi":"10.1674/0003-0031-179.1.15","usgsCitation":"Gable, T.D., Windels, S.K., Bruggink, J.G., and Barber-Meyer, S., 2018, Weekly summer diet of gray wolves (Canis lupus) in northeastern Minnesota: American Midland Naturalist, v. 179, no. 1, p. 15-27, https://doi.org/10.1674/0003-0031-179.1.15.","productDescription":"13 p.","startPage":"15","endPage":"27","ipdsId":"IP-081332","costCenters":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":352523,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Minnesota","otherGeospatial":"Kabetogama State Forest","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -92.89627075195312,\n 48.120267527274464\n ],\n [\n -92.46368408203125,\n 48.120267527274464\n ],\n [\n -92.46368408203125,\n 48.34529727896014\n ],\n [\n -92.89627075195312,\n 48.34529727896014\n ],\n [\n -92.89627075195312,\n 48.120267527274464\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"179","issue":"1","publishingServiceCenter":{"id":4,"text":"Rolla PSC"},"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5afee755e4b0da30c1bfc26f","contributors":{"authors":[{"text":"Gable, Thomas D.","contributorId":203312,"corporation":false,"usgs":false,"family":"Gable","given":"Thomas","email":"","middleInitial":"D.","affiliations":[{"id":36598,"text":"Dept of Biol, Northern Michigan University","active":true,"usgs":false}],"preferred":false,"id":731090,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Windels, Steve K.","contributorId":182422,"corporation":false,"usgs":false,"family":"Windels","given":"Steve","email":"","middleInitial":"K.","affiliations":[{"id":18939,"text":"Voyageurs National Park","active":true,"usgs":false}],"preferred":false,"id":731091,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bruggink, John G.","contributorId":203313,"corporation":false,"usgs":false,"family":"Bruggink","given":"John","email":"","middleInitial":"G.","affiliations":[{"id":36598,"text":"Dept of Biol, Northern Michigan University","active":true,"usgs":false}],"preferred":false,"id":731092,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Barber-Meyer, Shannon 0000-0002-3048-2616 sbarber-meyer@usgs.gov","orcid":"https://orcid.org/0000-0002-3048-2616","contributorId":191875,"corporation":false,"usgs":true,"family":"Barber-Meyer","given":"Shannon","email":"sbarber-meyer@usgs.gov","affiliations":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"preferred":true,"id":731089,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70228185,"text":"70228185 - 2018 - Watershed export of fine sediment, organic carbon, and chlorophyll-a to Chesapeake Bay: Spatial and temporal patterns in 1984–2016","interactions":[],"lastModifiedDate":"2022-02-07T16:53:32.713489","indexId":"70228185","displayToPublicDate":"2017-11-29T10:50:36","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3352,"text":"Science of the Total Environment","active":true,"publicationSubtype":{"id":10}},"title":"Watershed export of fine sediment, organic carbon, and chlorophyll-a to Chesapeake Bay: Spatial and temporal patterns in 1984–2016","docAbstract":"Chesapeake Bay has long experienced nutrient enrichment and water clarity deterioration. This study provides new quantification of loads and yields for sediment (fine and coarse grained), organic carbon (total, dissolved, and particulate), and chlorophyll-a from the monitored nontidal Chesapeake Bay watershed (MNTCBW), all of which are expected to drive estuarine water clarity. We conducted an integrated analysis of nine major tributaries to the Bay to understand spatial and temporal export patterns over the last thirty years (1984–2016). In terms of spatial pattern, export of these constituents from the MNTCBW was strongly dominated (~ 90%) by the three largest tributaries (i.e., Susquehanna, Potomac, and James). Among the nine tributaries, the ranking of constituent export generally follows the order of their watershed sizes, with other factors such as land use and reservoir playing important roles in some exceptions. In terms of partitioning, suspended sediment (SS) export was dominated by fine-grained sediment (SSfine) in all nine tributaries; overall, ~ 90% of the MNTCBW SS is SSfine. Total organic carbon (TOC) export was dominated by dissolved organic carbon (DOC) in all tributaries except Potomac River; overall, ~ 60% of the MNTCBW TOC is DOC. A comparison with literature shows that the MNTCBW SS and TOC yields were ~ 80% and ~ 60% of the respective medians of worldwide watersheds. In terms of temporal pattern, flow-normalized yields from the MNTCBW show overall increases in SS (both long-term [1984–2016] and short-term [2004–2016]), SSfine (long-term and short-term), TOC (long-term), and chlorophyll-a (short-term). The rises in SS, SSfine, and TOC were largely driven by Susquehanna River where Conowingo Reservoir's trapping efficiency has greatly diminished in the last twenty years. Overall, these new results on the status and trends of sediment, organic carbon, and chlorophyll-a provide the foundation for building potential linkages between riverine inputs and estuarine water clarity patterns.
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0000-0002-0140-6534","orcid":"https://orcid.org/0000-0002-0140-6534","contributorId":215461,"corporation":false,"usgs":true,"family":"Blomquist","given":"Joel","middleInitial":"D.","affiliations":[{"id":374,"text":"Maryland Water Science Center","active":true,"usgs":true}],"preferred":true,"id":833346,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70194112,"text":"70194112 - 2018 - Anticoagulant rodenticide toxicity to non-target wildlife under controlled exposure conditions","interactions":[],"lastModifiedDate":"2017-11-30T12:36:42","indexId":"70194112","displayToPublicDate":"2017-11-29T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Anticoagulant rodenticide toxicity to non-target wildlife under controlled exposure conditions","docAbstract":"Much of our understanding of anticoagulant rodenticide toxicity to non-target wildlife has been derived from molecular through whole animal research and registration studies in domesticated birds and mammals, and to a lesser degree from trials with captive wildlife. Using these data, an adverse outcome pathway identifying molecular initiating and anchoring events (inhibition of vitamin K epoxide reductase, failure to activate clotting factors), and established and plausible linkages (coagulopathy, hemorrhage, anemia, reduced fitness) associated with toxicity, is presented. Controlled exposure studies have demonstrated that second-generation anticoagulant rodenticides (e.g., brodifacoum) are more toxic than first- and intermediate-generation compounds (e.g., warfarin, diphacinone), however the difference in potency is diminished when first- and intermediate-generation compounds are administered on multiple days. Differences in species sensitivity are inconsistent among compounds. Numerous studies have compared mortality rate of predators fed prey or tissue containing anticoagulant rodenticides. In secondary exposure studies in birds, brodifacoum appears to pose the greatest risk, with bromadiolone, difenacoum, flocoumafen and difethialone being less hazardous than brodifacoum, and warfarin, coumatetralyl, coumafuryl, chlorophacinone and diphacinone being even less hazardous. In contrast, substantial mortality was noted in secondary exposure studies in mammals ingesting prey or tissue diets containing either second- or intermediate-generation compounds. Sublethal responses (e.g., prolonged clotting time, reduced hematocrit and anemia) have been used to study the sequelae of anticoagulant intoxication, and to some degree in the establishment of toxicity thresholds or toxicity reference values. Surprisingly few studies have undertaken histopathological evaluations to identify cellular lesions and hemorrhage associated with anticoagulant rodenticide exposure in non-target wildlife. Ecological risk assessments of anticoagulant rodenticides would be improved with additional data on (i) interspecific differences in sensitivity, particularly for understudied taxa, (ii) sublethal effects unrelated to coagulopathy, (iii) responses to mixtures and sequential exposures, and (iv) the role of vitamin K status on toxicity, and significance of inclusion of supplemental vitamin K or menadione (provitamin) in the diet of test organisms. A more complete understanding of the toxicity of anticoagulant rodenticides in non-target wildlife would enable regulators and natural resource managers to better predict and even mitigate risk.","largerWorkTitle":"Anticoagulant rodenticides and wildlife","language":"English","publisher":"Springer","doi":"10.1007/978-3-319-64377-9_3","usgsCitation":"Rattner, B.A., and Mastrota, F.N., 2018, Anticoagulant rodenticide toxicity to non-target wildlife under controlled exposure conditions, chap. of Anticoagulant rodenticides and wildlife, v. 5, p. 45-86, https://doi.org/10.1007/978-3-319-64377-9_3.","productDescription":"42 p.","startPage":"45","endPage":"86","ipdsId":"IP-073175","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":349531,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"5","publishingServiceCenter":{"id":10,"text":"Baltimore PSC"},"noUsgsAuthors":false,"publicationDate":"2017-11-11","publicationStatus":"PW","scienceBaseUri":"5a60fad6e4b06e28e9c22782","contributors":{"editors":[{"text":"van den Brink, Nico","contributorId":127370,"corporation":false,"usgs":false,"family":"van den Brink","given":"Nico","affiliations":[{"id":6920,"text":"Wageningen University, The Netherlands","active":true,"usgs":false}],"preferred":false,"id":724035,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Elliott, J.","contributorId":200997,"corporation":false,"usgs":false,"family":"Elliott","given":"J.","affiliations":[],"preferred":false,"id":724036,"contributorType":{"id":2,"text":"Editors"},"rank":2},{"text":"Shore, R.","contributorId":200998,"corporation":false,"usgs":false,"family":"Shore","given":"R.","email":"","affiliations":[],"preferred":false,"id":724037,"contributorType":{"id":2,"text":"Editors"},"rank":3},{"text":"Rattner, B.","contributorId":51416,"corporation":false,"usgs":true,"family":"Rattner","given":"B.","affiliations":[],"preferred":false,"id":724038,"contributorType":{"id":2,"text":"Editors"},"rank":4}],"authors":[{"text":"Rattner, Barnett A. 0000-0003-3676-2843 brattner@usgs.gov","orcid":"https://orcid.org/0000-0003-3676-2843","contributorId":4142,"corporation":false,"usgs":true,"family":"Rattner","given":"Barnett","email":"brattner@usgs.gov","middleInitial":"A.","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"preferred":true,"id":722111,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Mastrota, F. Nicholas","contributorId":200995,"corporation":false,"usgs":false,"family":"Mastrota","given":"F.","email":"","middleInitial":"Nicholas","affiliations":[],"preferred":false,"id":724034,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70194110,"text":"70194110 - 2018 - Anticoagulant rodenticides and wildlife: Concluding remarks","interactions":[],"lastModifiedDate":"2017-11-30T09:52:17","indexId":"70194110","displayToPublicDate":"2017-11-29T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Anticoagulant rodenticides and wildlife: Concluding remarks","docAbstract":"Rodents are known to affect human society globally in various adverse ways, resulting in a widespread demand for their continuous control. Anticoagulant rodenticides (ARs) have been, and currently remain, the cornerstone of rodent control throughout the world. Although alternative control methods exist, they are generally less effective. ARs work by affecting vitamin K metabolism, thereby preventing the activation of blood clotting factors and eventual coagulopathy. Since ARs are non-selective, their undoubted benefits for rodent control have to be balanced against the environmental risks that these compounds pose. Although they have been used for decades, pharmacokinetic and toxicokinetic data are mainly available for laboratory mammals and have concentrated on acute effects. Limited information is available on chronic exposure scenarios and for wildlife species. Important gaps exist in our understanding of the large inter- and intra-species differences in sensitivity to ARs, especially for non-target species, and in our knowledge about the occurrence and importance of sub-lethal effects in wildlife. It is clear that mere presence of AR residues in the body tissues may not indicate the occurrence of effects, although unequivocal assessment of effects under field conditions is difficult. Ante-mortem symptoms, like lethargy, subdued behaviour and unresponsiveness are generally not very specific as is true for more generic post-mortem observations (e.g. pallor of the mucous membranes or occurrence of haemorrhages). It is only by combining ante or post-mortem data with information on exposure that effects in the field may be confirmed. We do know however that a wide variety of non-target species are directly exposed to ARs. Secondary exposure in predators is also widespread although there is limited information on whether this exposure causes actual effects. Exposure is driven by ecological factors and is context specific with respect to spatial habitat configuration and bait placement. Another key factor that affects the interaction between ARs and wildlife is the development of resistance in target species. The development of resistance has resulted in higher use of SGARs, thereby increasing the potential of non-target and secondary exposure. AR use has increasingly become more strictly regulated, increasing the need for alternatives. Alternatives are available, including non-anticoagulant rodenticides, but these may also pose significant risk to environmental organisms, humans and pets. There are also various mitigation measures that can be implemented when using ARs, including bait protection, pulsed baiting at the onset of infestation, restricting use by non-professionals, and avoiding use in areas of high non-target density. Reduction in secondary exposure may result from e.g. non-chemical control, habitat management, and, in agricultural habitats, the use of lure crops and supplemental feeding. Such Integrated Pest Management (IPM) may not only reduce non-target exposure but also benefit resistance management. Barriers to adopt IPM approaches however, include the perception that they do not work or too slowly and are more laborious, expensive and time consuming. It is therefore important that the expectations of stakeholders are considered and managed. Nevertheless, further development of alternatives and IPM measures is essential, so the key research priority related to rodent control may ultimately be to address the lack of scientific assessment of the effectiveness of both specific AR mitigation measures and of IPM approaches to rodent control.","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Anticoagulant rodenticides and wildlife","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"Springer","doi":"10.1007/978-3-319-64377-9_14","usgsCitation":"van den Brink, N.W., Elliott, J., Shore, R., and Rattner, B.A., 2018, Anticoagulant rodenticides and wildlife: Concluding remarks, chap. of Anticoagulant rodenticides and wildlife, v. 5, p. 379-386, https://doi.org/10.1007/978-3-319-64377-9_14.","productDescription":"8 p.","startPage":"379","endPage":"386","ipdsId":"IP-086091","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":500002,"rank":0,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://research.wur.nl/en/publications/anticoagulant-rodenticides-and-wildlife-concluding-remarks","text":"External Repository"},{"id":349540,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"5","publishingServiceCenter":{"id":10,"text":"Baltimore PSC"},"noUsgsAuthors":false,"publicationDate":"2017-11-11","publicationStatus":"PW","scienceBaseUri":"5a60fad6e4b06e28e9c22787","contributors":{"authors":[{"text":"van den Brink, Nico W.","contributorId":39229,"corporation":false,"usgs":true,"family":"van den Brink","given":"Nico","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":724046,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Elliott, John E.","contributorId":169675,"corporation":false,"usgs":false,"family":"Elliott","given":"John E.","affiliations":[],"preferred":false,"id":724047,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Shore, Richard F.","contributorId":111984,"corporation":false,"usgs":true,"family":"Shore","given":"Richard F.","affiliations":[],"preferred":false,"id":724048,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rattner, Barnett A. 0000-0003-3676-2843 brattner@usgs.gov","orcid":"https://orcid.org/0000-0003-3676-2843","contributorId":4142,"corporation":false,"usgs":true,"family":"Rattner","given":"Barnett","email":"brattner@usgs.gov","middleInitial":"A.","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"preferred":true,"id":722109,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70193708,"text":"70193708 - 2018 - Urban raptor communities: Why some raptors and not others occupy urban environments","interactions":[],"lastModifiedDate":"2020-08-20T17:12:30.484472","indexId":"70193708","displayToPublicDate":"2017-11-29T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"chapter":"3","title":"Urban raptor communities: Why some raptors and not others occupy urban environments","docAbstract":"No abstract available.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Urban raptors: Ecology and conservation of birds of prey in cities","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"Island Press","usgsCitation":"Boal, C.W., 2018, Urban raptor communities: Why some raptors and not others occupy urban environments, chap. 3 of Urban raptors: Ecology and conservation of birds of prey in cities.","ipdsId":"IP-083943","costCenters":[{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true}],"links":[{"id":349549,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":349548,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://islandpress.org/book/urban-raptors"}],"publishingServiceCenter":{"id":9,"text":"Reston PSC"},"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a60fad6e4b06e28e9c2278a","contributors":{"editors":[{"text":"Boal, Clint W. 0000-0001-6008-8911 cboal@usgs.gov","orcid":"https://orcid.org/0000-0001-6008-8911","contributorId":1909,"corporation":false,"usgs":true,"family":"Boal","given":"Clint","email":"cboal@usgs.gov","middleInitial":"W.","affiliations":[{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true},{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true}],"preferred":true,"id":724053,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Dykstra, Cheryl R.","contributorId":18142,"corporation":false,"usgs":false,"family":"Dykstra","given":"Cheryl","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":724054,"contributorType":{"id":2,"text":"Editors"},"rank":2}],"authors":[{"text":"Boal, Clint W. 0000-0001-6008-8911 cboal@usgs.gov","orcid":"https://orcid.org/0000-0001-6008-8911","contributorId":1909,"corporation":false,"usgs":true,"family":"Boal","given":"Clint","email":"cboal@usgs.gov","middleInitial":"W.","affiliations":[{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true},{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true}],"preferred":true,"id":720003,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70194446,"text":"70194446 - 2018 - Effects of host injury on susceptibility of marine reef fishes to ectoparasitic gnathiid isopods","interactions":[],"lastModifiedDate":"2018-04-27T16:48:09","indexId":"70194446","displayToPublicDate":"2017-11-29T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":5073,"text":"Symbiosis","active":true,"publicationSubtype":{"id":10}},"title":"Effects of host injury on susceptibility of marine reef fishes to ectoparasitic gnathiid isopods","docAbstract":"The importance of the role that parasites play in ecological communities is becoming increasingly apparent. However much about their impact on hosts and thus populations and communities remains poorly understood. A common observation in wild populations is high variation in levels of parasite infestation among hosts. While high variation could be due to chance encounter, there is increasing evidence to suggest that such patterns are due to a combination of environmental, host, and parasite factors. In order to examine the role of host condition on parasite infection, rates of Gnathia marleyi infestation were compared between experimentally injured and uninjured fish hosts. Experimental injuries were similar to the minor wounds commonly observed in nature. The presence of the injury significantly increased the probability of infestation by gnathiids. However, the level of infestation (i.e., total number of gnathiid parasites) for individual hosts, appeared to be unaffected by the treatment. The results from this study indicate that injuries obtained by fish in nature may carry the additional cost of increased parasite burden along with the costs typically associated with physical injury. These results suggest that host condition may be an important factor in determining the likelihood of infestation by a common coral reef fish ectoparasite, G. marleyi.
","language":"English","publisher":"Springer","doi":"10.1007/s13199-017-0518-z","usgsCitation":"Jenkins, W.G., Demopoulos, A.W., and Sikkel, P.C., 2018, Effects of host injury on susceptibility of marine reef fishes to ectoparasitic gnathiid isopods: Symbiosis, v. 75, no. 2, p. 113-121, https://doi.org/10.1007/s13199-017-0518-z.","productDescription":"9 p.","startPage":"113","endPage":"121","ipdsId":"IP-087918","costCenters":[{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"links":[{"id":349536,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"75","issue":"2","publishingServiceCenter":{"id":5,"text":"Lafayette PSC"},"noUsgsAuthors":false,"publicationDate":"2017-11-13","publicationStatus":"PW","scienceBaseUri":"5a60fafde4b06e28e9c22a98","contributors":{"authors":[{"text":"Jenkins, William G. 0000-0001-5133-2628","orcid":"https://orcid.org/0000-0001-5133-2628","contributorId":200936,"corporation":false,"usgs":false,"family":"Jenkins","given":"William","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":723855,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Demopoulos, Amanda W.J. 0000-0003-2096-4694 ademopoulos@usgs.gov","orcid":"https://orcid.org/0000-0003-2096-4694","contributorId":196216,"corporation":false,"usgs":true,"family":"Demopoulos","given":"Amanda","email":"ademopoulos@usgs.gov","middleInitial":"W.J.","affiliations":[{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"preferred":false,"id":723854,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Sikkel, Paul C.","contributorId":140403,"corporation":false,"usgs":false,"family":"Sikkel","given":"Paul","email":"","middleInitial":"C.","affiliations":[{"id":13476,"text":"Arkansas State University, State University, AR","active":true,"usgs":false}],"preferred":false,"id":723856,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70194479,"text":"70194479 - 2018 - An extirpated lineage of a threatened frog species resurfaces in southern California","interactions":[],"lastModifiedDate":"2018-09-28T14:30:11","indexId":"70194479","displayToPublicDate":"2017-11-29T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2968,"text":"Oryx","active":true,"publicationSubtype":{"id":10}},"title":"An extirpated lineage of a threatened frog species resurfaces in southern California","docAbstract":"Southern California has experienced widespread amphibian declines since the 1960s. One species, the Vulnerable California red-legged frog Rana draytonii, is now considered to be extirpated from most of southern California. In February 2017 a population of R. draytonii was discovered in the southern foothills of the San Bernardino Mountains of Riverside County, California, near the edge of the species’ historical distribution. This population belongs to an mtDNA lineage that was presumed to be extirpated within the USA but is still extant in Baja California, Mexico. This discovery increases the potential for future, evolutionarily informed translocations within the southern portion of this species’ range in California.
","language":"English","publisher":"Cambridge University Press","doi":"10.1017/S0030605317001168","usgsCitation":"Backlin, A.R., Richmond, J.Q., Gallegos, E., Christensen, C.K., and Fisher, R.N., 2018, An extirpated lineage of a threatened frog species resurfaces in southern California: Oryx, v. 52, no. 4, p. 718-722, https://doi.org/10.1017/S0030605317001168.","productDescription":"5 p.","startPage":"718","endPage":"722","ipdsId":"IP-085992","costCenters":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"links":[{"id":469154,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1017/s0030605317001168","text":"Publisher Index Page"},{"id":438068,"rank":0,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/F7C82870","text":"USGS data release","linkHelpText":"New record of California red-legged frogs (Rana draytonii) in Whitewater Canyon, Riverside County, CA, USA"},{"id":349528,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"52","issue":"4","publishingServiceCenter":{"id":1,"text":"Sacramento PSC"},"noUsgsAuthors":false,"publicationDate":"2017-11-27","publicationStatus":"PW","scienceBaseUri":"5a60fafbe4b06e28e9c22a85","contributors":{"authors":[{"text":"Backlin, Adam R. 0000-0001-5618-8426 abacklin@usgs.gov","orcid":"https://orcid.org/0000-0001-5618-8426","contributorId":3802,"corporation":false,"usgs":true,"family":"Backlin","given":"Adam","email":"abacklin@usgs.gov","middleInitial":"R.","affiliations":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"preferred":true,"id":724022,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Richmond, Jonathan Q. 0000-0001-9398-4894 jrichmond@usgs.gov","orcid":"https://orcid.org/0000-0001-9398-4894","contributorId":5400,"corporation":false,"usgs":true,"family":"Richmond","given":"Jonathan","email":"jrichmond@usgs.gov","middleInitial":"Q.","affiliations":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"preferred":true,"id":724023,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Gallegos, Elizabeth 0000-0002-8402-2631 egallegos@usgs.gov","orcid":"https://orcid.org/0000-0002-8402-2631","contributorId":1528,"corporation":false,"usgs":true,"family":"Gallegos","given":"Elizabeth","email":"egallegos@usgs.gov","affiliations":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"preferred":true,"id":724024,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Christensen, Clinton K.","contributorId":200990,"corporation":false,"usgs":false,"family":"Christensen","given":"Clinton","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":724025,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Fisher, Robert N. 0000-0002-2956-3240 rfisher@usgs.gov","orcid":"https://orcid.org/0000-0002-2956-3240","contributorId":1529,"corporation":false,"usgs":true,"family":"Fisher","given":"Robert","email":"rfisher@usgs.gov","middleInitial":"N.","affiliations":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"preferred":true,"id":724021,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70194111,"text":"70194111 - 2018 - Anticoagulant rodenticides and wildlife: Introduction","interactions":[],"lastModifiedDate":"2017-11-30T09:50:00","indexId":"70194111","displayToPublicDate":"2017-11-29T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Anticoagulant rodenticides and wildlife: Introduction","docAbstract":"Rodents have interacted with people since the beginning of systematic food storage by humans in the early Neolithic era. Such interactions have had adverse outcomes such as threats to human health, spoiling and consumption of food sources, damage to human infrastructure and detrimental effects on indigenous island wildlife (through inadvertent anthropogenic assisted introductions). These socio/economic and environmental impacts illustrate the clear need to control populations of commensal rodents. Different methods have been applied historically but the main means of control in the last decades is through the application of rodenticides, mainly anticoagulant rodenticides (ARs) that inhibit blood clotting. The so-called First Generation Anticoagulant Rodenticides (FGARs) proved highly effective but rodents increasingly developed resistance. This led to a demand for more effective alternative compounds and paved the way to the development of Second Generation Anticoagulant Rodenticides (SGARs). These were more acutely toxic and persistent, making them more effective but also increasing the risks of exposure of non-target species and secondary poisoning of predatory species. SGARs often fail the environmental thresholds of different regulatory frameworks because of these negative side-effects, but their use is still permitted because of the overwhelming societal needs for rodent control and the lack of effective alternatives. This book provides a state-of-the-art overview of the scientific advancements in assessment of environmental exposure, effects and risks of currently used ARs. This is discussed in relation to the societal needs for rodent control, including risk mitigation and development of alternatives.","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Anticoagulant rodenticides and wildlife","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"Springer","doi":"10.1007/978-3-319-64377-9_1","usgsCitation":"van den Brink, N.W., Elliott, J., Shore, R., and Rattner, B.A., 2018, Anticoagulant rodenticides and wildlife: Introduction, chap. of Anticoagulant rodenticides and wildlife, v. 5, p. 1-9, https://doi.org/10.1007/978-3-319-64377-9_1.","productDescription":"9 p.","startPage":"1","endPage":"9","ipdsId":"IP-084360","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":499976,"rank":0,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://research.wur.nl/en/publications/anticoagulant-rodenticides-and-wildlife-introduction","text":"External Repository"},{"id":349538,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"5","publishingServiceCenter":{"id":10,"text":"Baltimore PSC"},"noUsgsAuthors":false,"publicationDate":"2017-11-11","publicationStatus":"PW","scienceBaseUri":"5a60fad6e4b06e28e9c22784","contributors":{"editors":[{"text":"van den Brink, Nico W.","contributorId":39229,"corporation":false,"usgs":true,"family":"van den Brink","given":"Nico","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":724042,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Elliott, John E.","contributorId":169675,"corporation":false,"usgs":false,"family":"Elliott","given":"John E.","affiliations":[],"preferred":false,"id":724043,"contributorType":{"id":2,"text":"Editors"},"rank":2},{"text":"Shore, Richard F.","contributorId":111984,"corporation":false,"usgs":true,"family":"Shore","given":"Richard F.","affiliations":[],"preferred":false,"id":724044,"contributorType":{"id":2,"text":"Editors"},"rank":3},{"text":"Rattner, Barnett A. 0000-0003-3676-2843 brattner@usgs.gov","orcid":"https://orcid.org/0000-0003-3676-2843","contributorId":4142,"corporation":false,"usgs":true,"family":"Rattner","given":"Barnett","email":"brattner@usgs.gov","middleInitial":"A.","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"preferred":true,"id":724045,"contributorType":{"id":2,"text":"Editors"},"rank":4}],"authors":[{"text":"van den Brink, Nico W.","contributorId":39229,"corporation":false,"usgs":true,"family":"van den Brink","given":"Nico","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":724039,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Elliott, John E.","contributorId":127368,"corporation":false,"usgs":false,"family":"Elliott","given":"John E.","affiliations":[{"id":6779,"text":"Environment Canada, Burlington, Ontario, Canada","active":true,"usgs":false}],"preferred":false,"id":724040,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Shore, Richard F.","contributorId":111984,"corporation":false,"usgs":true,"family":"Shore","given":"Richard F.","affiliations":[],"preferred":false,"id":724041,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rattner, Barnett A. 0000-0003-3676-2843 brattner@usgs.gov","orcid":"https://orcid.org/0000-0003-3676-2843","contributorId":4142,"corporation":false,"usgs":true,"family":"Rattner","given":"Barnett","email":"brattner@usgs.gov","middleInitial":"A.","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"preferred":true,"id":722110,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70194430,"text":"70194430 - 2018 - Living on the edge: Opportunities for Amur tiger recovery in China","interactions":[],"lastModifiedDate":"2018-07-26T13:08:41","indexId":"70194430","displayToPublicDate":"2017-11-28T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1015,"text":"Biological Conservation","active":true,"publicationSubtype":{"id":10}},"title":"Living on the edge: Opportunities for Amur tiger recovery in China","docAbstract":"Sporadic sightings of the endangered Amur tiger Panthera tigris altaica along the China-Russia border during the late 1990s sparked efforts to expand this subspecies distribution and abundance by restoring potentially suitable habitats in the Changbai Mountains. To guide science-based recovery efforts and provide a baseline for future monitoring of this border population, empirical, quantitative information is needed on what resources and management practices promote or limit the occurrence of tigers in the region. We established a large-scale field camera-trapping network to estimate tiger density, survival and recruitment in the Hunchun Nature Reserve and the surrounding area using an open population spatially explicit capture-recapture model. We then fitted an occupancy model that accounted for detectability and spatial autocorrelation to assess the relative influence of habitat, major prey, disturbance and management on tiger habitat use patterns. Our results show that the ranges of most tigers abut the border with Russia. Tiger densities ranged between 0.20 and 0.27 individuals/100 km2 over the study area; in the Hunchun Nature Reserve, the tiger density was three times higher than that in the surrounding inland forested area. Tiger occupancy was strongly negatively related to heavy cattle grazing, human settlements and roads and was positively associated with sika deer abundance and vegetation cover. These findings can help to identify the drivers of tiger declines and dispersal limits and refine strategies for tiger conservation in the human-dominated transboundary landscape. Progressively alleviating the impacts of cattle and human disturbances on the forest, and simultaneously addressing the economic needs of local communities, should be key priority actions to increase tiger populations. The long-term goal is to expand tiger distribution by improving habitats for large ungulates.","language":"English","publisher":"Elsevier","doi":"10.1016/j.biocon.2017.11.008","usgsCitation":"Wang, T., Royle, A., Smith, J., Zou, L., Lu, X., Li, T., Yang, H., Li, Z., Feng, R., Bian, Y., Feng, L., and Ge, J., 2018, Living on the edge: Opportunities for Amur tiger recovery in China: Biological Conservation, v. 217, p. 269-279, https://doi.org/10.1016/j.biocon.2017.11.008.","productDescription":"11 p.","startPage":"269","endPage":"279","ipdsId":"IP-090114","costCenters":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":349415,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"China","state":"Jilin Province","otherGeospatial":"Changbai Mountains","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n 129.869384765625,\n 42.35042512243457\n ],\n [\n 131.19873046875,\n 42.35042512243457\n ],\n [\n 131.19873046875,\n 43.27720532212024\n ],\n [\n 129.869384765625,\n 43.27720532212024\n ],\n [\n 129.869384765625,\n 42.35042512243457\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"217","publishingServiceCenter":{"id":10,"text":"Baltimore PSC"},"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a60fafee4b06e28e9c22ac2","contributors":{"authors":[{"text":"Wang, Tianming","contributorId":200892,"corporation":false,"usgs":false,"family":"Wang","given":"Tianming","email":"","affiliations":[],"preferred":false,"id":723742,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Royle, J. 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We used a time series of beach profile data at Fire Island, New York to define a new contour-based morphologic change metric, the Beach Change Envelope (BCE). The BCE quantifies changes to the upper portion of the beach likely to sustain measurable impacts from storm waves and capture a variety of storm and post-storm beach states. We evaluated the ability of the BCE to characterize cycles of beach change by relating it to a conceptual beach recovery regime, and demonstrated that BCE width and BCE height from the profile time series correlate well with established stages of recovery. We also investigated additional applications of this metric to capture impacts from storms and human modification by applying it to several post-storm historical datasets in which impacts varied considerably; Nor'Ida (2009), Hurricane Irene (2011), Hurricane Sandy (2012), and a 2009 community replenishment. In each case, the BCE captured distinctive upper beach morphologic change characteristic of these different beach building and erosional events. Analysis of the beach state at multiple profile locations showed spatial trends in recovery consistent with recent morphologic island evolution, which other studies have linked with sediment availability and the geologic framework. Ultimately we demonstrate a new way of more effectively characterizing beach response and recovery cycles to evaluate change along sandy coasts.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.geomorph.2017.08.004","usgsCitation":"Brenner, O.T., Lentz, E.E., Hapke, C.J., Henderson, R.E., Wilson, K., and Nelson, T., 2018, Characterizing storm response and recovery using the beach change envelope: Fire Island, New York: Geomorphology, v. 300, p. 189-202, https://doi.org/10.1016/j.geomorph.2017.08.004.","productDescription":"14 p.","startPage":"189","endPage":"202","ipdsId":"IP-081355","costCenters":[{"id":574,"text":"St. Petersburg Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":461105,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1016/j.geomorph.2017.08.004","text":"Publisher Index Page"},{"id":349532,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"New York","otherGeospatial":"Fire Island","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -73.2242202758789,\n 40.62177060472069\n ],\n [\n -73.14216613769531,\n 40.62177060472069\n ],\n [\n -73.14216613769531,\n 40.65485736139743\n ],\n [\n -73.2242202758789,\n 40.65485736139743\n ],\n [\n -73.2242202758789,\n 40.62177060472069\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"300","publishingServiceCenter":{"id":9,"text":"Reston PSC"},"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a60fad6e4b06e28e9c22791","contributors":{"authors":[{"text":"Brenner, Owen T. 0000-0002-1588-721X obrenner@usgs.gov","orcid":"https://orcid.org/0000-0002-1588-721X","contributorId":4933,"corporation":false,"usgs":true,"family":"Brenner","given":"Owen","email":"obrenner@usgs.gov","middleInitial":"T.","affiliations":[{"id":574,"text":"St. Petersburg Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":723886,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lentz, Erika E. 0000-0002-0621-8954 elentz@usgs.gov","orcid":"https://orcid.org/0000-0002-0621-8954","contributorId":173964,"corporation":false,"usgs":true,"family":"Lentz","given":"Erika","email":"elentz@usgs.gov","middleInitial":"E.","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":723889,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hapke, Cheryl J. 0000-0002-2753-4075 chapke@usgs.gov","orcid":"https://orcid.org/0000-0002-2753-4075","contributorId":2981,"corporation":false,"usgs":true,"family":"Hapke","given":"Cheryl","email":"chapke@usgs.gov","middleInitial":"J.","affiliations":[{"id":6676,"text":"USGS (retired)","active":true,"usgs":false}],"preferred":true,"id":723887,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Henderson, Rachel E. 0000-0001-5810-7941 rehenderson@usgs.gov","orcid":"https://orcid.org/0000-0001-5810-7941","contributorId":194022,"corporation":false,"usgs":true,"family":"Henderson","given":"Rachel","email":"rehenderson@usgs.gov","middleInitial":"E.","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true},{"id":574,"text":"St. Petersburg Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":723890,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Wilson, Kathleen 0000-0002-2810-7585 kwilson@usgs.gov","orcid":"https://orcid.org/0000-0002-2810-7585","contributorId":195620,"corporation":false,"usgs":true,"family":"Wilson","given":"Kathleen","email":"kwilson@usgs.gov","affiliations":[{"id":574,"text":"St. Petersburg Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":723888,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Nelson, Timothy 0000-0002-5005-7617 trnelson@usgs.gov","orcid":"https://orcid.org/0000-0002-5005-7617","contributorId":191933,"corporation":false,"usgs":true,"family":"Nelson","given":"Timothy","email":"trnelson@usgs.gov","affiliations":[{"id":574,"text":"St. Petersburg Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":723891,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70194344,"text":"70194344 - 2018 - Viscous relaxation as a prerequisite for tectonic resurfacing on Ganymede: Insights from numerical models of lithospheric extension","interactions":[],"lastModifiedDate":"2018-03-19T11:25:07","indexId":"70194344","displayToPublicDate":"2017-11-28T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1963,"text":"Icarus","active":true,"publicationSubtype":{"id":10}},"title":"Viscous relaxation as a prerequisite for tectonic resurfacing on Ganymede: Insights from numerical models of lithospheric extension","docAbstract":"Ganymede’s bright terrain formed during a near-global resurfacing event (or events) that produced both heavily tectonized and relatively smooth terrains. The mechanism(s) by which resurfacing occurred on Ganymede (e.g., cryovolcanic or tectonic), and the relationship between the older, dark and the younger, bright terrain are fundamental to understanding the geological evolution of the satellite. Using a two-dimensional numerical model of lithospheric extension that has previously been used to successfully simulate surface deformation consistent with grooved terrain morphologies, we investigate whether large-amplitude preexisting topography can be resurfaced (erased) by extension (i.e., tectonic resurfacing). Using synthetically produced initial topography, we show that when the total relief of the initial topography is larger than 25–50 m, periodic groove-like structures fail to form. Instead, extension is localized in a few individual, isolated troughs. These results pose a challenge to the tectonic resurfacing hypothesis. We further investigate the effects of preexisting topography by performing suites of simulations initialized with topography derived from digital terrain models of Ganymede’s surface. These include dark terrain, fresh (relatively deep) impact craters, smooth bright terrain, and a viscously relaxed impact crater. The simulations using dark terrain and fresh impact craters are consistent with our simulations using synthetic topography: periodic groove-like deformation fails to form. In contrast, when simulations were initialized with bright smooth terrain topography, groove-like deformation results from a wide variety of heat flow and surface temperature conditions. Similarly, when a viscously relaxed impact crater was used, groove-like structures were able to form during extension. These results suggest that tectonic resurfacing may require that the amplitude of the initial topography be reduced before extension begins. We emphasize that viscous relaxation may be the key to enabling tectonic resurfacing, as the heat fluxes associated with groove terrain formation are also capable of reducing crater topography through viscous relaxation. For long-wavelength topography (large craters) viscous relaxation is unavoidable. We propose that the resurfacing of Ganymede occurred through a combination of viscous relaxation, tectonic resurfacing, cryovolcanism and, at least in a few cases, band formation. Variations in heat flow and strain magnitudes across Ganymede likely produced the complex variety of terrain types currently observed.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.icarus.2017.10.017","usgsCitation":"Bland, M.T., and McKinnon, W.B., 2018, Viscous relaxation as a prerequisite for tectonic resurfacing on Ganymede: Insights from numerical models of lithospheric extension: Icarus, v. 306, p. 285-305, https://doi.org/10.1016/j.icarus.2017.10.017.","productDescription":"21 p.","startPage":"285","endPage":"305","ipdsId":"IP-085490","costCenters":[{"id":131,"text":"Astrogeology Science Center","active":true,"usgs":true}],"links":[{"id":349426,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"306","publishingServiceCenter":{"id":14,"text":"Menlo Park PSC"},"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a60fb00e4b06e28e9c22ad7","contributors":{"authors":[{"text":"Bland, Michael T. 0000-0001-5543-1519 mbland@usgs.gov","orcid":"https://orcid.org/0000-0001-5543-1519","contributorId":146287,"corporation":false,"usgs":true,"family":"Bland","given":"Michael","email":"mbland@usgs.gov","middleInitial":"T.","affiliations":[{"id":131,"text":"Astrogeology Science Center","active":true,"usgs":true}],"preferred":true,"id":723383,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"McKinnon, William B.","contributorId":196152,"corporation":false,"usgs":false,"family":"McKinnon","given":"William","email":"","middleInitial":"B.","affiliations":[{"id":16661,"text":"Washington University in Saint Louis","active":true,"usgs":false}],"preferred":false,"id":723384,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70217648,"text":"70217648 - 2018 - Varve formation during the past three centuries in three large proglacial lakes in south-central Alaska","interactions":[],"lastModifiedDate":"2023-11-14T15:17:54.512541","indexId":"70217648","displayToPublicDate":"2017-11-27T06:48:12","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1786,"text":"Geological Society of America Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"Varve formation during the past three centuries in three large proglacial lakes in south-central Alaska","docAbstract":"The sediments stored in the large, deep proglacial lakes of south-central Alaska are largely unstudied. We analyzed sediments in 20 cores, up to 160 cm long, from Eklutna, Kenai, and Skilak Lakes, using a combination of repeated lamination counting, radionuclide dating, event stratigraphy, and tephrochronology. We show that the characteristically rhythmic layers were deposited annually. Most of these glacial varves consist of one coarse-grained base and a fine-grained top, but varves composed of multiple coarse-grained turbidite pulses are common too. They are likely related to successive episodes of high sediment discharge during flooding, and they become more frequent in all three lakes, along with increased sedimentation rates, during the nineteenth century late phase of the Little Ice Age. These flood turbidites were generated by rain events and intense melting of snow and ice. Other (mega) turbidites are a result of earthquake-triggered slope collapses (e.g., A.D. 1964). Some event layers are present in all three lakes. In addition, the annual time series of varve thickness (normalized annual sedimentation rate) are significantly correlated among the three lakes (ρ > 0.27; p < 0.001). Differences between the varve thickness records can be attributed partly to the dam construction at Eklutna Lake and outbursts from an ice-dammed lake at Skilak Lake. Geomorphologic differences among the catchments result in further differences in sedimentation patterns in the three lakes.
","language":"English","publisher":"Geological Society of America","doi":"10.1130/B31792.1","usgsCitation":"Boes, E., Van Daele, M., Moernaut, J., Schmidt, S., Jensen, B.J., Praet, N., Kaufman, D., Haeussler, P., Loso, M.G., and De Batist, M., 2018, Varve formation during the past three centuries in three large proglacial lakes in south-central Alaska: Geological Society of America Bulletin, v. 130, no. 5-6, p. 757-774, https://doi.org/10.1130/B31792.1.","productDescription":"18 p.","startPage":"757","endPage":"774","ipdsId":"IP-087929","costCenters":[{"id":119,"text":"Alaska Science Center Geology Minerals","active":true,"usgs":true}],"links":[{"id":382576,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","otherGeospatial":"Eklutna Lake, Kenai Lake, Skilak Lake","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": 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Rockies","interactions":[],"lastModifiedDate":"2017-11-27T10:15:02","indexId":"70194306","displayToPublicDate":"2017-11-25T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"chapter":"7","title":"Effects of climate change on ecological disturbance in the northern Rockies","docAbstract":"Disturbances alter ecosystem, community, or population structure and change elements of the biological and/or physical environment. Climate changes can alter the timing, magnitude, frequency, and duration of disturbance events, as well as the interactions of disturbances on a landscape, and climate change may already be affecting disturbance events and regimes. Interactions among disturbance regimes, such as the cooccurrence in space and time of bark beetle outbreaks and wildfires, can result in highly visible, rapidly occurring, and persistent changes in landscape composition and structure. Understanding how altered disturbance patterns and multiple disturbance interactions might result in novel and emergent landscape behaviors is critical for addressing climate change impacts and for designing land management strategies that are appropriate for future climates This chapter describes the ecology of important disturbance regimes in the Northern Rockies region, and potential shifts in these regimes as a consequence of observed and projected climate change. We summarize five disturbance types present in the Northern Rockies that are sensitive to a changing climate--wildfires, bark beetles, white pine blister rust (Cronartium ribicola), other forest diseases, and nonnative plant invasions—and provide information that can help managers anticipate how, when, where, and why climate changes may alter the characteristics of disturbance regimes.","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Climate change and Rocky Mountain ecosystems; Advances in Global Change Research v. 63","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"Springer","doi":"10.1007/978-3-319-56928-4_7","isbn":"978-3-319-56927-7","usgsCitation":"Loehman, R.A., Bentz, B.J., DeNitto, G.A., Keane, R.E., Manning, M.E., Duncan, J.P., Egan, J.M., Jackson, M.B., Kegley, S., Lockman, I.B., Pearson, D.E., Powell, J.A., Shelly, S., Steed, B.E., and Zambino, P.J., 2018, Effects of climate change on ecological disturbance in the northern Rockies, chap. 7 of Climate change and Rocky Mountain ecosystems; Advances in Global Change Research v. 63, v. 63, p. 115-141, https://doi.org/10.1007/978-3-319-56928-4_7.","productDescription":"27 p.","startPage":"115","endPage":"141","ipdsId":"IP-087575","costCenters":[{"id":118,"text":"Alaska Science Center Geography","active":true,"usgs":true}],"links":[{"id":349306,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Rocky Mountains","volume":"63","publishingServiceCenter":{"id":12,"text":"Tacoma PSC"},"noUsgsAuthors":false,"publicationDate":"2017-07-20","publicationStatus":"PW","scienceBaseUri":"5a60fad7e4b06e28e9c22799","contributors":{"editors":[{"text":"Halofsky, Jessica E.","contributorId":146628,"corporation":false,"usgs":false,"family":"Halofsky","given":"Jessica","email":"","middleInitial":"E.","affiliations":[{"id":13553,"text":"University of Washington-Seattle","active":true,"usgs":false}],"preferred":false,"id":723391,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Peterson, David L.","contributorId":94643,"corporation":false,"usgs":false,"family":"Peterson","given":"David","email":"","middleInitial":"L.","affiliations":[{"id":12647,"text":"U.S. Forest Service, Pacific Northwest Research Station","active":true,"usgs":false}],"preferred":false,"id":723392,"contributorType":{"id":2,"text":"Editors"},"rank":2}],"authors":[{"text":"Loehman, Rachel A. 0000-0001-7680-1865 rloehman@usgs.gov","orcid":"https://orcid.org/0000-0001-7680-1865","contributorId":187605,"corporation":false,"usgs":true,"family":"Loehman","given":"Rachel","email":"rloehman@usgs.gov","middleInitial":"A.","affiliations":[{"id":118,"text":"Alaska Science Center Geography","active":true,"usgs":true},{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"preferred":false,"id":723194,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bentz, Barbara J.","contributorId":200734,"corporation":false,"usgs":false,"family":"Bentz","given":"Barbara","email":"","middleInitial":"J.","affiliations":[{"id":6679,"text":"US Forest Service, Rocky Mountain Research Station","active":true,"usgs":false}],"preferred":false,"id":723195,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"DeNitto, Gregg A.","contributorId":200735,"corporation":false,"usgs":false,"family":"DeNitto","given":"Gregg","email":"","middleInitial":"A.","affiliations":[{"id":35842,"text":"U.S. Forest Service Northern Region, Missoula","active":true,"usgs":false}],"preferred":false,"id":723196,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Keane, Robert E.","contributorId":200723,"corporation":false,"usgs":false,"family":"Keane","given":"Robert","email":"","middleInitial":"E.","affiliations":[{"id":6679,"text":"US Forest Service, Rocky Mountain Research Station","active":true,"usgs":false}],"preferred":false,"id":723197,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Manning, Mary E.","contributorId":200726,"corporation":false,"usgs":false,"family":"Manning","given":"Mary","email":"","middleInitial":"E.","affiliations":[{"id":35842,"text":"U.S. Forest Service Northern Region, Missoula","active":true,"usgs":false}],"preferred":false,"id":723198,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Duncan, Jacob P.","contributorId":200736,"corporation":false,"usgs":false,"family":"Duncan","given":"Jacob","email":"","middleInitial":"P.","affiliations":[{"id":12682,"text":"Utah State University, Logan, UT","active":true,"usgs":false}],"preferred":false,"id":723199,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Egan, Joel M.","contributorId":200737,"corporation":false,"usgs":false,"family":"Egan","given":"Joel","email":"","middleInitial":"M.","affiliations":[{"id":35842,"text":"U.S. Forest Service Northern Region, Missoula","active":true,"usgs":false}],"preferred":false,"id":723200,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Jackson, Marcus B.","contributorId":200738,"corporation":false,"usgs":false,"family":"Jackson","given":"Marcus","email":"","middleInitial":"B.","affiliations":[{"id":35842,"text":"U.S. Forest Service Northern Region, Missoula","active":true,"usgs":false}],"preferred":false,"id":723201,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Kegley, Sandra","contributorId":200739,"corporation":false,"usgs":false,"family":"Kegley","given":"Sandra","email":"","affiliations":[{"id":35842,"text":"U.S. Forest Service Northern Region, Missoula","active":true,"usgs":false}],"preferred":false,"id":723202,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Lockman, I. 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The earliest changes will be at ecotones between lifeforms (e.g., upper and lower treelines). Ecological disturbance, including wildfire and insect outbreaks, will be the primary facilitator of vegetation change, and future forest landscapes may be dominated by younger age classes and smaller trees. High-elevation forests will be especially vulnerable if disturbance frequency","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Climate change and Rocky Mountain ecosystems; Advances in Global Change Research v. 63","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"Springer","doi":"10.1007/978-3-319-56928-4_5","isbn":"978-3-319-56927-7","usgsCitation":"Keane, R.E., Mahalovich, M.F., Bollenbacher, B.L., Manning, M.E., Loehman, R.A., Jain, T.B., Holsinger, L.M., and Larson, A.J., 2018, Effects of climate change on forest vegetation in the northern Rockies, chap. 5 of Climate change and Rocky Mountain ecosystems; Advances in Global Change Research v. 63, v. 63, p. 59-95, https://doi.org/10.1007/978-3-319-56928-4_5.","productDescription":"37 p.","startPage":"59","endPage":"95","ipdsId":"IP-087655","costCenters":[{"id":118,"text":"Alaska Science Center 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repository for populating, managing, and distributing metadata","docAbstract":"Creating, maintaining, and archiving accurate station metadata is critical for successful seismic network operations, data discovery, and research. The Station Information System (SIS) is a centralized repository of seismic station equipment inventory, instrument response, and site information of stations operated by regional seismic networks (RSNs) of the Advanced National Seismic System (ANSS; Filson and Arabasz, 2017). It has a web‐based user interface that enables the creation and manipulation of the corresponding metadata. The system can track the installation, maintenance, and removal of equipment from a site, which often results in the creation of new metadata epochs. SIS also computes the overall response, including gain, of a data channel by combining the responses of the underlying hardware components. SIS distributes this information in standard formats such as Federation of Digital Seismic Networks StationXML and dataless Standard for the Exchange of Earthquake Data. SIS can also be used to manage inventory of field equipment such as power, telemetry, or Global Positioning System antenna, as well as links to other site‐related repositories external to SIS to give the network operator the most complete view of a site and the overall network. This article summarizes the main features in SIS. We present its basic infrastructure, holdings, workflow, and how RSNs retrieve data from it. We also explain the reasoning to pursue one centralized repository and why it supports the goals of SIS and the ANSS. We demonstrate that by providing the ANSS network operator with a comprehensive site view, SIS enables the production of high‐quality metadata, a necessary prerequisite for producing high‐quality seismic data.
","language":"English","publisher":"Seismological Society of America","doi":"10.1785/0220170130","usgsCitation":"Yu, E., Acharya, P., Jaramillo, J., Kientz, S., Thomas, V., and Hauksson, E., 2018, The Station Information System (SIS): A centralized seismic station repository for populating, managing, and distributing metadata: Seismological Research Letters, v. 89, no. 1, p. 47-55, https://doi.org/10.1785/0220170130.","productDescription":"9 p.","startPage":"47","endPage":"55","ipdsId":"IP-088648","costCenters":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true}],"links":[{"id":469155,"rank":2,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://resolver.caltech.edu/CaltechAUTHORS:20171127-131244965","text":"External Repository"},{"id":406843,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"89","issue":"1","noUsgsAuthors":false,"publicationDate":"2017-11-22","publicationStatus":"PW","contributors":{"authors":[{"text":"Yu, Ellen","contributorId":222020,"corporation":false,"usgs":false,"family":"Yu","given":"Ellen","email":"","affiliations":[{"id":7218,"text":"California Institute of Technology","active":true,"usgs":false}],"preferred":false,"id":851950,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Acharya, Prabha","contributorId":296601,"corporation":false,"usgs":false,"family":"Acharya","given":"Prabha","email":"","affiliations":[{"id":7218,"text":"California Institute of Technology","active":true,"usgs":false}],"preferred":false,"id":851951,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Jaramillo, Justin","contributorId":296602,"corporation":false,"usgs":false,"family":"Jaramillo","given":"Justin","email":"","affiliations":[{"id":7218,"text":"California Institute of Technology","active":true,"usgs":false}],"preferred":false,"id":851952,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Kientz, Sue","contributorId":296603,"corporation":false,"usgs":false,"family":"Kientz","given":"Sue","email":"","affiliations":[{"id":7218,"text":"California Institute of Technology","active":true,"usgs":false}],"preferred":false,"id":851953,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Thomas, Valerie I. 0000-0001-6170-5563","orcid":"https://orcid.org/0000-0001-6170-5563","contributorId":208162,"corporation":false,"usgs":true,"family":"Thomas","given":"Valerie I.","affiliations":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true}],"preferred":true,"id":851954,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Hauksson, Egill","contributorId":48174,"corporation":false,"usgs":false,"family":"Hauksson","given":"Egill","affiliations":[{"id":27150,"text":"Seismological Laboratory, California Institute of Technology, Pasadena, CA, USA","active":true,"usgs":false}],"preferred":false,"id":851955,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70194325,"text":"70194325 - 2018 - Variability in eddy sandbar dynamics during two decades of controlled flooding of the Colorado River in the Grand Canyon","interactions":[],"lastModifiedDate":"2018-04-02T16:28:27","indexId":"70194325","displayToPublicDate":"2017-11-22T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3368,"text":"Sedimentary Geology","active":true,"publicationSubtype":{"id":10}},"title":"Variability in eddy sandbar dynamics during two decades of controlled flooding of the Colorado River in the Grand Canyon","docAbstract":"Sandbars are iconic features of the Colorado River in the Grand Canyon, Arizona, U.S.A. Following completion of Glen Canyon Dam in 1963, sediment deficit conditions caused erosion of eddy sandbars throughout much of the 360 km study reach downstream from the dam. Controlled floods in 1996, 2004, and 2008 demonstrated that sand on the channel bed could be redistributed to higher elevations, and that floods timed to follow tributary sediment inputs would increase suspended sand concentrations during floods. Since 2012, a new management protocol has resulted in four controlled floods timed to follow large inputs of sand from a major tributary. Monitoring of 44 downstream eddy sandbars, initiated in 1990, shows that each controlled flood deposited significant amounts of sand and increased the size of subaerial sandbars. However, the magnitude of sandbar deposition varied from eddy to eddy, even over relatively short distances where main-stem suspended sediment concentrations were similar. Here, we characterize spatial and temporal trends in sandbar volume and site-scale (i.e., individual eddy) sediment storage as a function of flow, channel, and vegetation characteristics that reflect the reach-scale (i.e., kilometer-scale) hydraulic environment. We grouped the long-term monitoring sites based on geomorphic setting and used a principal component analysis (PCA) to correlate differences in sandbar behavior to changes in reach-scale geomorphic metrics. Sites in narrow reaches are less-vegetated, stage changes markedly with discharge, sandbars tend to remain dynamic, and sand storage change dominantly occurs in the eddy compared to the main channel. In wider reaches, where stage-change during floods may be half that of narrow sites, sandbars are more likely to be stabilized by vegetation, and floods tend to aggrade the vegetated sandbar surfaces. In these locations, deposition during controlled floods is more akin to floodplain sedimentation, and the elevation of sandbar surfaces increases with successive floods. Because many sandbars are intermediate to the end members described above, high-elevation bar surfaces stabilized by vegetation often have a more dynamic unvegetated sandbar on the channel-ward margin that aggrades and erodes in response to controlled flood cycles. Ultimately, controlled floods have been effective at increasing averaged sandbar volumes, and, while bar deposition during floods decreases through time where vegetation has stabilized sandbars, future controlled floods are likely to continue to result in deposition in a majority of the river corridor.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.sedgeo.2017.11.007","usgsCitation":"Mueller, E.R., Grams, P.E., Hazel, J., and Schmidt, J.C., 2018, Variability in eddy sandbar dynamics during two decades of controlled flooding of the Colorado River in the Grand Canyon: Sedimentary Geology, v. 363, p. 181-199, https://doi.org/10.1016/j.sedgeo.2017.11.007.","productDescription":"19 p.","startPage":"181","endPage":"199","ipdsId":"IP-088808","costCenters":[{"id":568,"text":"Southwest Biological Science Center","active":true,"usgs":true}],"links":[{"id":438069,"rank":0,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/F7HD7SSW","text":"USGS data release","linkHelpText":"Colorado River Eddy Sandbar Dynamics Data"},{"id":349282,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Colorado River, Grand Canyon","volume":"363","publishingServiceCenter":{"id":14,"text":"Menlo Park PSC"},"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a60fad7e4b06e28e9c227a1","contributors":{"authors":[{"text":"Mueller, Erich R. 0000-0001-8202-154X emueller@usgs.gov","orcid":"https://orcid.org/0000-0001-8202-154X","contributorId":4930,"corporation":false,"usgs":true,"family":"Mueller","given":"Erich","email":"emueller@usgs.gov","middleInitial":"R.","affiliations":[{"id":568,"text":"Southwest Biological Science Center","active":true,"usgs":true}],"preferred":true,"id":723314,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Grams, Paul E. 0000-0002-0873-0708 pgrams@usgs.gov","orcid":"https://orcid.org/0000-0002-0873-0708","contributorId":1830,"corporation":false,"usgs":true,"family":"Grams","given":"Paul","email":"pgrams@usgs.gov","middleInitial":"E.","affiliations":[{"id":568,"text":"Southwest Biological Science Center","active":true,"usgs":true}],"preferred":true,"id":723315,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hazel, Joseph E. Jr.","contributorId":91819,"corporation":false,"usgs":true,"family":"Hazel","given":"Joseph E.","suffix":"Jr.","affiliations":[],"preferred":false,"id":723316,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Schmidt, John C. 0000-0002-2988-3869 jcschmidt@usgs.gov","orcid":"https://orcid.org/0000-0002-2988-3869","contributorId":1983,"corporation":false,"usgs":true,"family":"Schmidt","given":"John","email":"jcschmidt@usgs.gov","middleInitial":"C.","affiliations":[{"id":568,"text":"Southwest Biological Science Center","active":true,"usgs":true}],"preferred":true,"id":723317,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70194286,"text":"70194286 - 2018 - 6th international conference on Mars polar science and exploration: Conference summary and five top questions","interactions":[],"lastModifiedDate":"2018-05-04T15:21:15","indexId":"70194286","displayToPublicDate":"2017-11-22T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1963,"text":"Icarus","active":true,"publicationSubtype":{"id":10}},"title":"6th international conference on Mars polar science and exploration: Conference summary and five top questions","docAbstract":"We provide a historical context of the International Conference on Mars Polar Science and Exploration and summarize the proceedings from the 6th iteration of this meeting. In particular, we identify five key Mars polar science questions based primarily on presentations and discussions at the conference and discuss the overlap between some of those questions. We briefly describe the seven scientific field trips that were offered at the conference, which greatly supplemented conference discussion of Mars polar processes and landforms. We end with suggestions for measurements, modeling, and laboratory and field work that were highlighted during conference discussion as necessary steps to address key knowledge gaps.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.icarus.2017.06.027","usgsCitation":"Smith, I.B., Diniega, S., Beaty, D.W., Thorsteinsson, T., Becerra, P., Bramson, A., Clifford, S.M., Hvidberg, C.S., Portyankina, G., Piqueux, S., Spiga, A., and Titus, T.N., 2018, 6th international conference on Mars polar science and exploration: Conference summary and five top questions: Icarus, v. 308, p. 2-14, https://doi.org/10.1016/j.icarus.2017.06.027.","productDescription":"13 p.","startPage":"2","endPage":"14","ipdsId":"IP-081480","costCenters":[{"id":131,"text":"Astrogeology Science Center","active":true,"usgs":true}],"links":[{"id":349272,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"308","publishingServiceCenter":{"id":14,"text":"Menlo Park PSC"},"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a60fb01e4b06e28e9c22af9","contributors":{"authors":[{"text":"Smith, Isaac B.","contributorId":200695,"corporation":false,"usgs":false,"family":"Smith","given":"Isaac","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":723084,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Diniega, Serina","contributorId":80532,"corporation":false,"usgs":true,"family":"Diniega","given":"Serina","affiliations":[],"preferred":false,"id":723085,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Beaty, David W.","contributorId":127511,"corporation":false,"usgs":false,"family":"Beaty","given":"David","email":"","middleInitial":"W.","affiliations":[{"id":7023,"text":"Jet Propulsion Laboratory, California Institute of Technology","active":true,"usgs":false}],"preferred":false,"id":723086,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Thorsteinsson, Thorsteinn","contributorId":200698,"corporation":false,"usgs":false,"family":"Thorsteinsson","given":"Thorsteinn","email":"","affiliations":[],"preferred":false,"id":723087,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Becerra, Patricio","contributorId":173341,"corporation":false,"usgs":false,"family":"Becerra","given":"Patricio","email":"","affiliations":[],"preferred":false,"id":723088,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Bramson, Ali","contributorId":189477,"corporation":false,"usgs":false,"family":"Bramson","given":"Ali","email":"","affiliations":[],"preferred":false,"id":723089,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Clifford, Stephen M.","contributorId":7984,"corporation":false,"usgs":true,"family":"Clifford","given":"Stephen","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":723090,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Hvidberg, Christine S.","contributorId":200702,"corporation":false,"usgs":false,"family":"Hvidberg","given":"Christine","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":723091,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Portyankina, Ganna","contributorId":200703,"corporation":false,"usgs":false,"family":"Portyankina","given":"Ganna","email":"","affiliations":[],"preferred":false,"id":723092,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Piqueux, Sylvain","contributorId":56986,"corporation":false,"usgs":false,"family":"Piqueux","given":"Sylvain","email":"","affiliations":[{"id":7023,"text":"Jet Propulsion Laboratory, California Institute of Technology","active":true,"usgs":false}],"preferred":false,"id":723291,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Spiga, Aymeric","contributorId":200704,"corporation":false,"usgs":false,"family":"Spiga","given":"Aymeric","email":"","affiliations":[],"preferred":false,"id":723093,"contributorType":{"id":1,"text":"Authors"},"rank":11},{"text":"Titus, Timothy N. 0000-0003-0700-4875 ttitus@usgs.gov","orcid":"https://orcid.org/0000-0003-0700-4875","contributorId":146,"corporation":false,"usgs":true,"family":"Titus","given":"Timothy","email":"ttitus@usgs.gov","middleInitial":"N.","affiliations":[{"id":131,"text":"Astrogeology Science Center","active":true,"usgs":true}],"preferred":true,"id":723083,"contributorType":{"id":1,"text":"Authors"},"rank":12}]}} ,{"id":70194314,"text":"70194314 - 2018 - Spring fasting behavior in a marine apex predator provides an index of ecosystem productivity","interactions":[],"lastModifiedDate":"2018-01-05T13:58:58","indexId":"70194314","displayToPublicDate":"2017-11-22T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1837,"text":"Global Change Biology","active":true,"publicationSubtype":{"id":10}},"title":"Spring fasting behavior in a marine apex predator provides an index of ecosystem productivity","docAbstract":"The effects of declining Arctic sea ice on local ecosystem productivity are not well understood but have been shown to vary inter-specifically, spatially, and temporally. Because marine mammals occupy upper trophic levels in Arctic food webs, they may be useful indicators for understanding variation in ecosystem productivity. Polar bears (Ursus maritimus) are apex predators that primarily consume benthic and pelagic-feeding ice-associated seals. As such, their productivity integrates sea ice conditions and the ecosystem supporting them. Declining sea ice availability has been linked to negative population effects for polar bears but does not fully explain observed population changes. We examined relationships between spring foraging success of polar bears and sea ice conditions, prey productivity, and general patterns of ecosystem productivity in the Beaufort and Chukchi Seas (CSs). Fasting status (≥7 days) was estimated using serum urea and creatinine levels of 1,448 samples collected from 1,177 adult and subadult bears across three subpopulations. Fasting increased in the Beaufort Sea between 1983–1999 and 2000–2016 and was related to an index of ringed seal body condition. This change was concurrent with declines in body condition of polar bears and observed changes in the diet, condition and/or reproduction of four other vertebrate consumers within the food chain. In contrast, fasting declined in CS polar bears between periods and was less common than in the two Beaufort Sea subpopulations consistent with studies demonstrating higher primary productivity and maintenance or improved body condition in polar bears, ringed seals, and bearded seals despite recent sea ice loss in this region. Consistency between regional and temporal variation in spring polar bear fasting and food web productivity suggests that polar bears may be a useful indicator species. Furthermore, our results suggest that spatial and temporal ecological variation is important in affecting upper trophic-level productivity in these marine ecosystems.
","language":"English","publisher":"Wiley","doi":"10.1111/gcb.13933","usgsCitation":"Rode, K.D., Wilson, R.H., Douglas, D.C., Muhlenbruch, V.L., Atwood, T.C., Regehr, E.V., Richardson, E., Pilfold, N., Derocher, A.E., Durner, G.M., Stirling, I., Amstrup, S.C., St. Martin, M., Pagano, A.M., and Simac, K.S., 2018, Spring fasting behavior in a marine apex predator provides an index of ecosystem productivity: Global Change Biology, v. 24, no. 1, p. 410-423, https://doi.org/10.1111/gcb.13933.","productDescription":"14 p.","startPage":"410","endPage":"423","ipdsId":"IP-085600","costCenters":[{"id":116,"text":"Alaska Science Center Biology MFEB","active":true,"usgs":true}],"links":[{"id":461107,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1111/gcb.13933","text":"Publisher Index Page"},{"id":438071,"rank":0,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/F7SQ8XJC","text":"USGS data release","linkHelpText":"Serum Urea and Creatinine Levels of Spring-Caught Polar Bears (Ursus maritimus) in the Southern Beaufort and Chukchi Seas"},{"id":349268,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"24","issue":"1","publishingServiceCenter":{"id":12,"text":"Tacoma PSC"},"noUsgsAuthors":false,"publicationDate":"2017-11-06","publicationStatus":"PW","scienceBaseUri":"5a60fad7e4b06e28e9c227a4","contributors":{"authors":[{"text":"Rode, Karyn D. 0000-0002-3328-8202 krode@usgs.gov","orcid":"https://orcid.org/0000-0002-3328-8202","contributorId":5053,"corporation":false,"usgs":true,"family":"Rode","given":"Karyn","email":"krode@usgs.gov","middleInitial":"D.","affiliations":[{"id":116,"text":"Alaska Science Center Biology MFEB","active":true,"usgs":true},{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"preferred":true,"id":723231,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wilson, Ryan H. 0000-0001-7740-7771","orcid":"https://orcid.org/0000-0001-7740-7771","contributorId":130989,"corporation":false,"usgs":false,"family":"Wilson","given":"Ryan","email":"","middleInitial":"H.","affiliations":[{"id":6987,"text":"U.S. Fish and Wildlife Sevice","active":true,"usgs":false}],"preferred":false,"id":723232,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Douglas, David C. 0000-0003-0186-1104 ddouglas@usgs.gov","orcid":"https://orcid.org/0000-0003-0186-1104","contributorId":2388,"corporation":false,"usgs":true,"family":"Douglas","given":"David","email":"ddouglas@usgs.gov","middleInitial":"C.","affiliations":[{"id":116,"text":"Alaska Science Center Biology MFEB","active":true,"usgs":true}],"preferred":true,"id":723233,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Muhlenbruch, Vanessa L","contributorId":200747,"corporation":false,"usgs":false,"family":"Muhlenbruch","given":"Vanessa","email":"","middleInitial":"L","affiliations":[],"preferred":false,"id":723234,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Atwood, Todd C. 0000-0002-1971-3110 tatwood@usgs.gov","orcid":"https://orcid.org/0000-0002-1971-3110","contributorId":4368,"corporation":false,"usgs":true,"family":"Atwood","given":"Todd","email":"tatwood@usgs.gov","middleInitial":"C.","affiliations":[{"id":116,"text":"Alaska Science Center Biology MFEB","active":true,"usgs":true},{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"preferred":true,"id":723235,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Regehr, Eric V. 0000-0003-4487-3105","orcid":"https://orcid.org/0000-0003-4487-3105","contributorId":66364,"corporation":false,"usgs":false,"family":"Regehr","given":"Eric","email":"","middleInitial":"V.","affiliations":[{"id":12428,"text":"U. 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This notion can be discounted primarily because most of the relevant CM fragments were found coated in thick crusts of pedogenic carbonate clearly showing that breakage occurred thousands of years ago. Haynes also raises questions about site stratigraphy, radiometric dating, and absence of other artifactual evidence. The stratigraphic context of CM bones and rocks is well-defined, and the Pleistocene site stratigraphy remained intact before excavation. Knapped stone tools are not a requirement in bone processing archaeological sites. In the absence of other plausible explanations for the multiple lines of evidence, we maintain that hominins broke the CM bones using stone hammers and anvils.
","language":"English","publisher":"Taylor & Francis ","doi":"10.1080/20555563.2017.1396835","usgsCitation":"Holen, S.R., Demere, T.A., Fisher, D.C., Fullagar, R., Paces, J.B., Jefferson, G.T., Beeton, J.M., Rountrey, A.N., and Holen, K.A., 2018, Broken bones and hammerstones at the Cerutti Mastodon site: A reply to Haynes: PaleoAmerica, v. 4, no. 1, p. 8-11, https://doi.org/10.1080/20555563.2017.1396835.","productDescription":"4 p.","startPage":"8","endPage":"11","ipdsId":"IP-090894","costCenters":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"links":[{"id":356690,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California ","otherGeospatial":"Cerutti Mastodon site","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -117.29690551757814,\n 32.52249989111295\n ],\n [\n -116.94671630859375,\n 32.52249989111295\n ],\n [\n -116.94671630859375,\n 32.83228893100241\n ],\n [\n -117.29690551757814,\n 32.83228893100241\n ],\n [\n -117.29690551757814,\n 32.52249989111295\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"4","issue":"1","publishingServiceCenter":{"id":2,"text":"Denver PSC"},"noUsgsAuthors":false,"publicationDate":"2017-11-21","publicationStatus":"PW","scienceBaseUri":"5b98a327e4b0702d0e843032","contributors":{"authors":[{"text":"Holen, Steven R.","contributorId":207197,"corporation":false,"usgs":false,"family":"Holen","given":"Steven","email":"","middleInitial":"R.","affiliations":[{"id":35320,"text":"Center for American Paleolithic Research","active":true,"usgs":false}],"preferred":false,"id":743207,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Demere, Thomas A.","contributorId":207198,"corporation":false,"usgs":false,"family":"Demere","given":"Thomas","email":"","middleInitial":"A.","affiliations":[{"id":16175,"text":"San Diego Natural History Museum","active":true,"usgs":false}],"preferred":false,"id":743208,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Fisher, Daniel C.","contributorId":207199,"corporation":false,"usgs":false,"family":"Fisher","given":"Daniel","email":"","middleInitial":"C.","affiliations":[{"id":37387,"text":"University of Michigan","active":true,"usgs":false}],"preferred":false,"id":743209,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Fullagar, Richard","contributorId":207200,"corporation":false,"usgs":false,"family":"Fullagar","given":"Richard","email":"","affiliations":[{"id":37474,"text":"University of Wollongong","active":true,"usgs":false}],"preferred":false,"id":743210,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Paces, James B. 0000-0002-9809-8493 jbpaces@usgs.gov","orcid":"https://orcid.org/0000-0002-9809-8493","contributorId":2514,"corporation":false,"usgs":true,"family":"Paces","given":"James","email":"jbpaces@usgs.gov","middleInitial":"B.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":743206,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Jefferson, George T.","contributorId":207201,"corporation":false,"usgs":false,"family":"Jefferson","given":"George","email":"","middleInitial":"T.","affiliations":[{"id":35321,"text":"California Department of Parks and Recreation","active":true,"usgs":false}],"preferred":false,"id":743211,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Beeton, Jared M.","contributorId":207202,"corporation":false,"usgs":false,"family":"Beeton","given":"Jared","email":"","middleInitial":"M.","affiliations":[{"id":35322,"text":"Adams State College","active":true,"usgs":false}],"preferred":false,"id":743212,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Rountrey, Adam N.","contributorId":207203,"corporation":false,"usgs":false,"family":"Rountrey","given":"Adam","email":"","middleInitial":"N.","affiliations":[{"id":37387,"text":"University of Michigan","active":true,"usgs":false}],"preferred":false,"id":743213,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Holen, Kathleen A.","contributorId":207204,"corporation":false,"usgs":false,"family":"Holen","given":"Kathleen","email":"","middleInitial":"A.","affiliations":[{"id":37475,"text":"Center for American Paleolithic Studies","active":true,"usgs":false}],"preferred":false,"id":743214,"contributorType":{"id":1,"text":"Authors"},"rank":9}]}} ,{"id":70222616,"text":"70222616 - 2018 - The 2015 Gorkha (Nepal) Earthquake sequence: I. Source modeling and deterministic 3D ground shaking","interactions":[],"lastModifiedDate":"2021-08-09T13:26:10.316998","indexId":"70222616","displayToPublicDate":"2017-11-21T08:21:12","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"The 2015 Gorkha (Nepal) Earthquake sequence: I. Source modeling and deterministic 3D ground shaking","docAbstract":"To better quantify the relatively long period (< 0.3 Hz) shaking experienced during the 2015 Gorkha (Nepal) earthquake sequence, we study the finite rupture processes and the associated 3D ground motion of the Mw7.8 mainshock and the Mw7.2 aftershock. The 3D synthetics are then used in the broadband ground shaking in Kathmandu with a hybrid approach, summarized in a companion paper (Chen and Wei, 2017, submitted together). We determined the coseismic rupture process of the mainshock by joint inversion of InSAR/SAR, GPS (static and high-rate), strong motion and teleseismic waveforms. Our inversion for the mainshock indicates unilateral rupture towards the ESE, with an average rupture speed of 3.0 km/s and a total duration of ~ 60 s. Additionally, we find that the beginning part of the rupture (5–18 s) has about 40% longer rise time than the rest of the rupture, as well as slower rupture velocity. Our model shows two strong asperities occurring ~ 24 s and ~ 36 s after the origin and located ~ 30 km to the northwest and northeast of the Kathmandu valley, respectively. In contrast, the Mw7.2 aftershock is more compact both in time and space, as revealed by joint inversion of teleseismic body waves and InSAR data. The different rupture features between the mainshock and the aftershock could be related to difference in fault zone structure. The mainshock and aftershock ground motions in the Kathmandu valley, recorded by both strong motion and high-rate GPS stations, exhibited strong amplification around 0.2 Hz. A simplified 3D basin model, calibrated by an Mw5.2 aftershock, can match the observed waveforms reasonably well at 0.3 Hz and lower frequency. The 3D simulations indicate that the basin structure trapped the wavefield and produced an extensive ground vibration. Our study suggests that the combination of rupture characteristics and propagational complexity are required to understand the ground shaking produced by hazardous earthquakes such as the Gorkha event.
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Source modeling and deterministic 3D ground shaking: Tectonophysics, v. 722, p. 447-461, https://doi.org/10.1016/j.tecto.2017.11.024.","productDescription":"15 p.","startPage":"447","endPage":"461","ipdsId":"IP-090039","costCenters":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true}],"links":[{"id":469156,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1016/j.tecto.2017.11.024","text":"Publisher Index Page"},{"id":387776,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Nepal","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n 86.539306640625,\n 26.696545111585152\n ],\n [\n 86.802978515625,\n 27.848790459862073\n ],\n [\n 82.650146484375,\n 29.6594160549124\n ],\n [\n 82.034912109375,\n 28.159189634046708\n ],\n [\n 85.4296875,\n 27.127591028502078\n ],\n [\n 86.539306640625,\n 26.696545111585152\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"722","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Wei, Shengji","contributorId":192953,"corporation":false,"usgs":false,"family":"Wei","given":"Shengji","email":"","affiliations":[],"preferred":false,"id":820768,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Chen, Meng","contributorId":261912,"corporation":false,"usgs":false,"family":"Chen","given":"Meng","email":"","affiliations":[{"id":48937,"text":"Earth Observatory of Singapore, Nanyang Technological University, Singapore","active":true,"usgs":false}],"preferred":false,"id":820769,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wang, Xin","contributorId":177411,"corporation":false,"usgs":false,"family":"Wang","given":"Xin","email":"","affiliations":[],"preferred":false,"id":820770,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Graves, Robert 0000-0001-9758-453X rwgraves@usgs.gov","orcid":"https://orcid.org/0000-0001-9758-453X","contributorId":140738,"corporation":false,"usgs":true,"family":"Graves","given":"Robert","email":"rwgraves@usgs.gov","affiliations":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true}],"preferred":true,"id":820771,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Lindsey, Eric","contributorId":261913,"corporation":false,"usgs":false,"family":"Lindsey","given":"Eric","email":"","affiliations":[{"id":48937,"text":"Earth Observatory of Singapore, Nanyang Technological University, Singapore","active":true,"usgs":false}],"preferred":false,"id":820772,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Wang, Teng","contributorId":156235,"corporation":false,"usgs":false,"family":"Wang","given":"Teng","email":"","affiliations":[{"id":20300,"text":"Southern Methodist University","active":true,"usgs":false}],"preferred":false,"id":820773,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Karakas, Cagil","contributorId":261914,"corporation":false,"usgs":false,"family":"Karakas","given":"Cagil","email":"","affiliations":[{"id":48937,"text":"Earth Observatory of Singapore, Nanyang Technological University, Singapore","active":true,"usgs":false}],"preferred":false,"id":820774,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Helmberger, Don","contributorId":192954,"corporation":false,"usgs":false,"family":"Helmberger","given":"Don","email":"","affiliations":[],"preferred":false,"id":820775,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}} ,{"id":70194250,"text":"70194250 - 2018 - A Holocene record of ocean productivity and upwelling from the northern California continental slope","interactions":[],"lastModifiedDate":"2018-04-27T16:49:28","indexId":"70194250","displayToPublicDate":"2017-11-20T00:00:00","publicationYear":"2018","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3217,"text":"Quaternary International","active":true,"publicationSubtype":{"id":10}},"title":"A Holocene record of ocean productivity and upwelling from the northern California continental slope","docAbstract":"The Holocene upwelling history of the northern California continental slope is examined using the high-resolution record of TN062-O550 (40.9°N, 124.6°W, 550 m water depth). This 7-m-long marine sediment core spans the last ∼7500 years, and we use it to test the hypothesis that marine productivity in the California Current System (CCS) driven by coastal upwelling has co-varied with Holocene millennial-scale warm intervals. A combination of biogenic sediment concentrations (opal, total organic C, and total N), stable isotopes (organic matter δ13C and bulk sedimentary δ15N), and key microfossil indicators of upwelling were used to test this hypothesis. The record of biogenic accumulation in TN062-O550 shows considerable Holocene variability despite being located within 50 km of the mouth of the Eel River, which is one of the largest sources of terrigenous sediment to the Northeast Pacific Ocean margin. A key time interval beginning at ∼2900 calibrated years before present (cal yr BP) indicates the onset of modern upwelling in the CCS, and this period also corresponds to the most intense period of upwelling in the last 7500 years. When these results are placed into a regional CCS context during the Holocene, it was found that the timing of upwelling intensification at TN062-O550 corresponds closely to that seen at nearby ODP Site 1019, as well as in the Santa Barbara Basin of southern California. Other CCS records with less refined age control show similar results, which suggest late Holocene upwelling intensification may be synchronous throughout the CCS. Based on the strong correspondence between the alkenone sea surface temperature record at ODP Site 1019 and the onset of late Holocene upwelling in northern California, we suggest that CCS warming may be conducive to upwelling intensification, though future changes are unclear as the mechanisms forcing SST variability may differ.
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