The objective of this simulation study was to create an age-structured population model for horseshoe crabs (Limulus polyphenols) in the Delaware Bay region using best available estimates of age-specific mortality and recent harvest levels. Density dependence was incorporated using a spatial model relating egg mortality with abundance of spawning females. Combinations of annual female harvest (0, 50, 100, and 200 thousand), timing of female harvest (before or after spawning), and three levels of density-dependent egg mortality were simulated. The probability of the population increasing was high (> 80%) with low and medium egg mortality and harvest less than 200 thousand females per year. Under the high egg mortality case, the probability of the population increasing was < 50% regardless of harvest. Harvest occurring after spawning increased the probability of population growth. The number of eggs available to shorebirds was highest when egg mortality was lowest and female abundance was at its highest levels. Although harvest and egg mortality influenced population growth and food availability to shorebirds, sensitivity and elasticity analyses showed that early-life stage mortality, age 0 mortality in particular, was the most important parameter for population growth. Our modeling results indicate areas where further research is needed and suggest effective management will involve a combination of harvest management and actions to increase early juvenile survival.
","language":"English","publisher":"SpringerLink","doi":"10.1007/BF02700170","usgsCitation":"Sweka, J., Smith, D., and Millard, M.J., 2007, An age-structured population model for horseshoe crabs in the Delaware Bay area to assess harvest and egg availability for shorebirds: Estuaries and Coasts, v. 30, no. 2, p. 277-286, https://doi.org/10.1007/BF02700170.","productDescription":"10 p.","startPage":"277","endPage":"286","costCenters":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true}],"links":[{"id":240245,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Delaware","otherGeospatial":"Delaware Bay","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -75.35522460937499,\n 38.976492485539396\n ],\n [\n -75.2398681640625,\n 38.852542390364235\n ],\n [\n -74.970703125,\n 38.843986129756615\n ],\n [\n -75.0421142578125,\n 39.0831721934762\n ],\n [\n -75.1849365234375,\n 39.18117526158749\n ],\n [\n -75.4156494140625,\n 39.142842478062505\n ],\n [\n -75.35522460937499,\n 38.976492485539396\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"30","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e9e7e4b0c8380cd48502","contributors":{"authors":[{"text":"Sweka, J. A.","contributorId":15015,"corporation":false,"usgs":false,"family":"Sweka","given":"J. A.","affiliations":[],"preferred":false,"id":424647,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, D. R. 0000-0001-6074-9257","orcid":"https://orcid.org/0000-0001-6074-9257","contributorId":44108,"corporation":false,"usgs":true,"family":"Smith","given":"D. R.","affiliations":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true}],"preferred":false,"id":424649,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Millard, M. J.","contributorId":40555,"corporation":false,"usgs":false,"family":"Millard","given":"M.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":424648,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029867,"text":"70029867 - 2007 - Developments in seismic monitoring for risk reduction","interactions":[],"lastModifiedDate":"2012-03-12T17:21:08","indexId":"70029867","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2447,"text":"Journal of Risk Research","active":true,"publicationSubtype":{"id":10}},"title":"Developments in seismic monitoring for risk reduction","docAbstract":"This paper presents recent state-of-the-art developments to obtain displacements and drift ratios for seismic monitoring and damage assessment of buildings. In most cases, decisions on safety of buildings following seismic events are based on visual inspections of the structures. Real-time instrumental measurements using GPS or double integration of accelerations, however, offer a viable alternative. Relevant parameters, such as the type of connections and structural characteristics (including storey geometry), can be estimated to compute drifts corresponding to several pre-selected threshold stages of damage. Drift ratios determined from real-time monitoring can then be compared to these thresholds in order to estimate damage conditions drift ratios. This approach is demonstrated in three steel frame buildings in San Francisco, California. Recently recorded data of strong shaking from these buildings indicate that the monitoring system can be a useful tool in rapid assessment of buildings and other structures following an earthquake. Such systems can also be used for risk monitoring, as a method to assess performance-based design and analysis procedures, for long-term assessment of structural characteristics of a building, and as a possible long-term damage detection tool.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Risk Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1080/13669870701447964","issn":"13669877","usgsCitation":"Çelebi, M., 2007, Developments in seismic monitoring for risk reduction: Journal of Risk Research, v. 10, no. 5, p. 715-727, https://doi.org/10.1080/13669870701447964.","startPage":"715","endPage":"727","numberOfPages":"13","costCenters":[],"links":[{"id":212719,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1080/13669870701447964"},{"id":240247,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"10","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0089e4b0c8380cd4f7a5","contributors":{"authors":[{"text":"Çelebi, M.","contributorId":36946,"corporation":false,"usgs":true,"family":"Çelebi","given":"M.","affiliations":[],"preferred":false,"id":424653,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70029868,"text":"70029868 - 2007 - Field-derived relationships for flow velocity and resistance in high-gradient streams","interactions":[],"lastModifiedDate":"2012-03-12T17:21:08","indexId":"70029868","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2342,"text":"Journal of Hydrology","active":true,"publicationSubtype":{"id":10}},"title":"Field-derived relationships for flow velocity and resistance in high-gradient streams","docAbstract":"We measured velocity and channel geometry in 10 reaches (bed gradient = 0.08-0.21) of a predominantly step-pool channel, the Rio Cordon, Italy, over a range of discharges (3-80% of the bankfull discharge). The resulting data were used to compute flow resistance. At-a-station hydraulic geometry relations indicate that in most reaches, the exponent describing the rate of velocity increases with discharge was between 0.48 and 0.6, which is within the range of published values for pool-riffle channels. The Rio Cordon data are also combined with published hydraulics data from step-pool streams to explore non-dimensional relationships between velocity and flow resistance and factors including unit discharge, channel gradient, and step geometry. Multiple regression analysis of this combined field dataset indicated that dimensionless unit discharge (q*) is the most important independent variable overall in explaining variations in velocity and flow resistance, followed by channel slope and the ratio of step height to step length. Empirical equations are provided both for dimensionless velocity and flow resistance, but prediction of the former variable appears more reliable. ?? 2007 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Hydrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.jhydrol.2007.03.021","issn":"00221694","usgsCitation":"Comiti, F., Mao, L., Wilcox, A., Wohl, E., and Lenzi, M., 2007, Field-derived relationships for flow velocity and resistance in high-gradient streams: Journal of Hydrology, v. 340, no. 1-2, p. 48-62, https://doi.org/10.1016/j.jhydrol.2007.03.021.","startPage":"48","endPage":"62","numberOfPages":"15","costCenters":[],"links":[{"id":212745,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jhydrol.2007.03.021"},{"id":240281,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"340","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0feee4b0c8380cd53a86","contributors":{"authors":[{"text":"Comiti, F.","contributorId":82130,"corporation":false,"usgs":true,"family":"Comiti","given":"F.","email":"","affiliations":[],"preferred":false,"id":424658,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Mao, L.","contributorId":64894,"corporation":false,"usgs":true,"family":"Mao","given":"L.","email":"","affiliations":[],"preferred":false,"id":424657,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wilcox, A.","contributorId":62834,"corporation":false,"usgs":true,"family":"Wilcox","given":"A.","email":"","affiliations":[],"preferred":false,"id":424655,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wohl, E.E. 0000-0001-7435-5013","orcid":"https://orcid.org/0000-0001-7435-5013","contributorId":28753,"corporation":false,"usgs":true,"family":"Wohl","given":"E.E.","affiliations":[],"preferred":false,"id":424654,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Lenzi, M.A.","contributorId":63622,"corporation":false,"usgs":true,"family":"Lenzi","given":"M.A.","email":"","affiliations":[],"preferred":false,"id":424656,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70029870,"text":"70029870 - 2007 - PIT tags increase effectiveness of freshwater mussel recaptures","interactions":[],"lastModifiedDate":"2017-11-06T09:46:14","indexId":"70029870","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2564,"text":"Journal of the North American Benthological Society","onlineIssn":"1937-237X","printIssn":"0887-3593","active":true,"publicationSubtype":{"id":10}},"title":"PIT tags increase effectiveness of freshwater mussel recaptures","docAbstract":"Translocations are used increasingly to conserve populations of rare freshwater mussels. Recovery of translocated mussels is essential to accurate assessment of translocation success. We designed an experiment to evaluate the use of passive integrated transponder (PIT) tags to mark and track individual freshwater mussels. We used eastern lampmussels (Lampsilis radiata radiata) as a surrogate for 2 rare mussel species. We assessed internal and external PIT-tag retention in the laboratory and field. Internal tag retention was high (75-100%), and tag rejection occurred primarily during the first 3 wk after tagging. A thin layer of nacre coated internal tags 3 to 4 mo after insertion, suggesting that long-term retention is likely. We released mussels with external PIT tags at 3 field study sites and recaptured them with a PIT pack (mobile interrogation unit) 8 to 10 mo and 21 to 23 mo after release. Numbers of recaptured mussels differed among study sites; however, we found more tagged mussels with the PIT-pack searches with visual confirmation (72-80%) than with visual searches alone (30-47%) at all sites. PIT tags offer improved recapture of translocated mussels and increased accuracy of posttranslocation monitoring. ?? 2007 by The North American Benthological Society.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of the North American Benthological Society","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1899/0887-3593(2007)26[253:PTIEOF]2.0.CO;2","issn":"08873593","usgsCitation":"Kurth, J., Loftin, C., Zydlewski, J.D., and Rhymer, J., 2007, PIT tags increase effectiveness of freshwater mussel recaptures: Journal of the North American Benthological Society, v. 26, no. 2, p. 253-260, https://doi.org/10.1899/0887-3593(2007)26[253:PTIEOF]2.0.CO;2.","startPage":"253","endPage":"260","numberOfPages":"8","costCenters":[],"links":[{"id":240316,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212778,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1899/0887-3593(2007)26[253:PTIEOF]2.0.CO;2"}],"volume":"26","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a735ee4b0c8380cd76fc5","contributors":{"authors":[{"text":"Kurth, J.","contributorId":7504,"corporation":false,"usgs":true,"family":"Kurth","given":"J.","email":"","affiliations":[],"preferred":false,"id":424669,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Loftin, C.","contributorId":78939,"corporation":false,"usgs":true,"family":"Loftin","given":"C.","email":"","affiliations":[],"preferred":false,"id":424671,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Zydlewski, Joseph D. 0000-0002-2255-2303 jzydlewski@usgs.gov","orcid":"https://orcid.org/0000-0002-2255-2303","contributorId":2004,"corporation":false,"usgs":true,"family":"Zydlewski","given":"Joseph","email":"jzydlewski@usgs.gov","middleInitial":"D.","affiliations":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true},{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true},{"id":199,"text":"Coop Res Unit Leetown","active":true,"usgs":true}],"preferred":false,"id":424668,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rhymer, Judith","contributorId":63507,"corporation":false,"usgs":true,"family":"Rhymer","given":"Judith","email":"","affiliations":[],"preferred":false,"id":424670,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029871,"text":"70029871 - 2007 - Impacts of a gape limited Brook Trout, Salvelinus fontinalis, on larval Northwestern salamander, Ambystoma gracile, growth: A field enclosure experiment","interactions":[],"lastModifiedDate":"2017-11-15T13:31:32","indexId":"70029871","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2334,"text":"Journal of Herpetology","active":true,"publicationSubtype":{"id":10}},"title":"Impacts of a gape limited Brook Trout, Salvelinus fontinalis, on larval Northwestern salamander, Ambystoma gracile, growth: A field enclosure experiment","docAbstract":"The formation of amphibian population structure is directly affected by predation. Although aquatic predators have been shown to have direct negative effects on larval salamanders in laboratory and field experiments, the potential impacts of gape-limited fish on larval salamander growth has been largely underexplored. We designed an enclosure experiment conducted in situ to quantify the effects of gape-limited Brook Trout (Salvelinus fontinalis) on larval Northwestern Salamander (Ambystoma gracile) growth. We specifically tested whether the presence of fish too small to consume larvae had a negative effect on larval growth. The results of this study indicate that the presence of a gape-limited S. fontinalis can have a negative effect on growth of larval A. gracile salamanders. Copyright 2007 Society for the Study of Amphibians and Reptiles.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Herpetology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1670/0022-1511(2007)41[321:IOAGLB]2.0.CO;2","issn":"00221511","usgsCitation":"Currens, C., Liss, W., and Hoffman, R., 2007, Impacts of a gape limited Brook Trout, Salvelinus fontinalis, on larval Northwestern salamander, Ambystoma gracile, growth: A field enclosure experiment: Journal of Herpetology, v. 41, no. 2, p. 321-324, https://doi.org/10.1670/0022-1511(2007)41[321:IOAGLB]2.0.CO;2.","startPage":"321","endPage":"324","numberOfPages":"4","costCenters":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"links":[{"id":240317,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212779,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1670/0022-1511(2007)41[321:IOAGLB]2.0.CO;2"}],"volume":"41","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a38dfe4b0c8380cd61700","contributors":{"authors":[{"text":"Currens, C.R.","contributorId":10364,"corporation":false,"usgs":true,"family":"Currens","given":"C.R.","email":"","affiliations":[],"preferred":false,"id":424672,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Liss, W.J.","contributorId":75887,"corporation":false,"usgs":true,"family":"Liss","given":"W.J.","email":"","affiliations":[],"preferred":false,"id":424674,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hoffman, R.L.","contributorId":28778,"corporation":false,"usgs":true,"family":"Hoffman","given":"R.L.","email":"","affiliations":[],"preferred":false,"id":424673,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029873,"text":"70029873 - 2007 - Effects of intraborehole flow on groundwater age distribution","interactions":[],"lastModifiedDate":"2018-10-11T19:02:24","indexId":"70029873","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1923,"text":"Hydrogeology Journal","active":true,"publicationSubtype":{"id":10}},"title":"Effects of intraborehole flow on groundwater age distribution","docAbstract":"Environmental tracers are used to estimate groundwater ages and travel times, but the strongly heterogeneous nature of many subsurface environments can cause mixing between waters of highly disparate ages, adding additional complexity to the age-estimation process. Mixing may be exacerbated by the presence of wells because long open intervals or long screens with openings at multiple depths can transport water and solutes rapidly over a large vertical distance. The effect of intraborehole flow on groundwater age was examined numerically using direct age transport simulation coupled with the Multi-Node Well Package of MODFLOW. Ages in a homogeneous, anisotropic aquifer reached a predevelopment steady state possessing strong depth dependence. A nonpumping multi-node well was then introduced in one of three locations within the system. In all three cases, vertical transport along the well resulted in substantial changes in age distributions within the system. After a pumping well was added near the nonpumping multi-node well, ages were further perturbed by a flow reversal in the nonpumping multi-node well. Results indicated that intraborehole flow can substantially alter groundwater ages, but the effects are highly dependent on local or regional flow conditions and may change with time.
","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Hydrogeology Journal","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10040-006-0139-8","issn":"14312174","usgsCitation":"Zinn, B., and Konikow, L.F., 2007, Effects of intraborehole flow on groundwater age distribution: Hydrogeology Journal, v. 15, no. 4, p. 633-643, https://doi.org/10.1007/s10040-006-0139-8.","productDescription":"11 p.","startPage":"633","endPage":"643","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":240353,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212809,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10040-006-0139-8"}],"volume":"15","issue":"4","noUsgsAuthors":false,"publicationDate":"2007-01-09","publicationStatus":"PW","scienceBaseUri":"505a0728e4b0c8380cd515ac","contributors":{"authors":[{"text":"Zinn, B.A.","contributorId":78153,"corporation":false,"usgs":true,"family":"Zinn","given":"B.A.","email":"","affiliations":[],"preferred":false,"id":424684,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Konikow, Leonard F. 0000-0002-0940-3856 lkonikow@usgs.gov","orcid":"https://orcid.org/0000-0002-0940-3856","contributorId":158,"corporation":false,"usgs":true,"family":"Konikow","given":"Leonard","email":"lkonikow@usgs.gov","middleInitial":"F.","affiliations":[{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":true,"id":424683,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70030024,"text":"70030024 - 2007 - Dominant factors in controlling marine gas pools in South China","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70030024","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1707,"text":"Frontiers of Earth Science in China","active":true,"publicationSubtype":{"id":10}},"title":"Dominant factors in controlling marine gas pools in South China","docAbstract":"In marine strata from Sinian to Middle Triassic in South China, there develop four sets of regional and six sets of local source rocks, and ten sets of reservoir rocks. The occurrence of four main formation periods in association with five main reconstruction periods, results in a secondary origin for the most marine gas pools in South China. To improve the understanding of marine gas pools in South China with severely deformed geological background, the dominant control factors are discussed in this paper. The fluid sources, including the gas cracked from crude oil, the gas dissolved in water, the gas of inorganic origin, hydrocarbons generated during the second phase, and the mixed pool fluid source, were the most significant control factors of the types and the development stage of pools. The period of the pool formation and the reconstruction controlled the pool evolution and the distribution on a regional scale. Owing to the multiple periods of the pool formation and the reconstruction, the distribution of marine gas pools was complex both in space and in time, and the gas in the pools is heterogeneous. Pool elements, such as preservation conditions, traps and migration paths, and reservoir rocks and facies, also served as important control factors to marine gas pools in South China. Especially, the preservation conditions played a key role in maintaining marine oil and gas accumulations on a regional or local scale. According to several dominant control factors of a pool, the pool-controlling model can be constructed. As an example, the pool-controlling model of Sinian gas pool in Weiyuan gas field in Sichuan basin was summed up. ?? Higher Education Press and Springer-Verlag 2007.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Frontiers of Earth Science in China","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s11707-007-0060-z","issn":"16737385","usgsCitation":"Xu, S., and Watney, W., 2007, Dominant factors in controlling marine gas pools in South China: Frontiers of Earth Science in China, v. 1, no. 4, p. 491-497, https://doi.org/10.1007/s11707-007-0060-z.","startPage":"491","endPage":"497","numberOfPages":"7","costCenters":[],"links":[{"id":213012,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s11707-007-0060-z"},{"id":240592,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"1","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a03a6e4b0c8380cd505b3","contributors":{"authors":[{"text":"Xu, S.","contributorId":84954,"corporation":false,"usgs":true,"family":"Xu","given":"S.","email":"","affiliations":[],"preferred":false,"id":425376,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Watney, W.L.","contributorId":43087,"corporation":false,"usgs":true,"family":"Watney","given":"W.L.","email":"","affiliations":[],"preferred":false,"id":425375,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029874,"text":"70029874 - 2007 - Competition between hardwood hammocks and mangroves","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029874","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1478,"text":"Ecosystems","active":true,"publicationSubtype":{"id":10}},"title":"Competition between hardwood hammocks and mangroves","docAbstract":"The boundaries between mangroves and freshwater hammocks in coastal ecotones of South Florida are sharp. Further, previous studies indicate that there is a discontinuity in plant predawn water potentials, with woody plants either showing predawn water potentials reflecting exposure to saline water or exposure to freshwater. This abrupt concurrent change in community type and plant water status suggests that there might be feedback dynamics between vegetation and salinity. A model examining the salinity of the aerated zone of soil overlying a saline body of water, known as the vadose layer, as a function of precipitation, evaporation and plant water uptake is presented here. The model predicts that mixtures of saline and freshwater vegetative species represent unstable states. Depending on the initial vegetation composition, subsequent vegetative change will lead either to patches of mangrove coverage having a high salinity vadose zone or to freshwater hammock coverage having a low salinity vadose zone. Complete or nearly complete coverage by either freshwater or saltwater vegetation represents two stable steady-state points. This model can explain many of the previous observations of vegetation patterns in coastal South Florida as well as observations on the dynamics of vegetation shifts caused by sea level rise and climate change. ?? 2007 Springer Science+Business Media, LLC.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ecosystems","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10021-007-9050-y","issn":"14329840","usgsCitation":"Sternberg, L., Teh, S., Ewe, S., Miralles-Wilhelm, F., and DeAngelis, D., 2007, Competition between hardwood hammocks and mangroves: Ecosystems, v. 10, no. 4, p. 648-660, https://doi.org/10.1007/s10021-007-9050-y.","startPage":"648","endPage":"660","numberOfPages":"13","costCenters":[],"links":[{"id":212838,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10021-007-9050-y"},{"id":240388,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"10","issue":"4","noUsgsAuthors":false,"publicationDate":"2007-05-22","publicationStatus":"PW","scienceBaseUri":"5059f8cce4b0c8380cd4d2d6","contributors":{"authors":[{"text":"Sternberg, L.D.S.L.","contributorId":41223,"corporation":false,"usgs":true,"family":"Sternberg","given":"L.D.S.L.","email":"","affiliations":[],"preferred":false,"id":424687,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Teh, S.Y.","contributorId":22969,"corporation":false,"usgs":true,"family":"Teh","given":"S.Y.","email":"","affiliations":[],"preferred":false,"id":424685,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ewe, S.M.L.","contributorId":78496,"corporation":false,"usgs":true,"family":"Ewe","given":"S.M.L.","email":"","affiliations":[],"preferred":false,"id":424688,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Miralles-Wilhelm, F.","contributorId":97325,"corporation":false,"usgs":true,"family":"Miralles-Wilhelm","given":"F.","affiliations":[],"preferred":false,"id":424689,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"DeAngelis, D.L. 0000-0002-1570-4057","orcid":"https://orcid.org/0000-0002-1570-4057","contributorId":32470,"corporation":false,"usgs":true,"family":"DeAngelis","given":"D.L.","affiliations":[],"preferred":false,"id":424686,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70029875,"text":"70029875 - 2007 - High-resolution shallow reflection seismic image and surface evidence of the Upper Tiber Basin active faults (Northern Apennines, Italy)","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029875","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"High-resolution shallow reflection seismic image and surface evidence of the Upper Tiber Basin active faults (Northern Apennines, Italy)","docAbstract":"Shallow seismic reflection prospecting has been carried out in order to investigate the faults that bound to the southwest and northeast the Quaternary Upper Tiber Basin (Northern Apennines, Italy). On the northeastern margin of the basin a ??? 1 km long reflection seismic profile images a fault segment and the associated up to 100 meters thick sediment wedge. Across the southwestern margin a 0.5 km-long seismic profile images a 50-55??-dipping extensional fault, that projects to the scarp at the base of the range-front, and against which a 100 m thick syn-tectonic sediment wedge has formed. The integration of surface and sub-surface data allows to estimate at least 190 meters of vertical displacement along the fault and a slip rate around 0.25 m/kyr. Southwestern fault might also be interpreted as the main splay structure of regional Alto Tiberina extensional fault. At last, the 1917 Monterchi earthquake (Imax=X, Boschi et alii, 2000) is correlable with an activation of the southwestern fault, and thus suggesting the seismogenic character of this latter.","largerWorkTitle":"Bollettino della Societa Geologica Italiana","language":"English","issn":"00378763","usgsCitation":"Donne, D., Plccardi, L., Odum, J.K., Stephenson, W.J., and Williams, R.A., 2007, High-resolution shallow reflection seismic image and surface evidence of the Upper Tiber Basin active faults (Northern Apennines, Italy), in Bollettino della Societa Geologica Italiana, v. 126, no. 2, p. 323-331.","startPage":"323","endPage":"331","numberOfPages":"9","costCenters":[],"links":[{"id":240389,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"126","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3135e4b0c8380cd5dd17","contributors":{"authors":[{"text":"Donne, D.D.","contributorId":73075,"corporation":false,"usgs":true,"family":"Donne","given":"D.D.","email":"","affiliations":[],"preferred":false,"id":424691,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Plccardi, L.","contributorId":21833,"corporation":false,"usgs":true,"family":"Plccardi","given":"L.","email":"","affiliations":[],"preferred":false,"id":424690,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Odum, J. K.","contributorId":105705,"corporation":false,"usgs":true,"family":"Odum","given":"J.","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":424694,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Stephenson, W. J.","contributorId":87982,"corporation":false,"usgs":true,"family":"Stephenson","given":"W.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":424693,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Williams, R. A.","contributorId":82323,"corporation":false,"usgs":true,"family":"Williams","given":"R.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":424692,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70029877,"text":"70029877 - 2007 - Mercury and selenium in American White Pelicans breeding at Pyramid Lake, Nevada","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029877","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3731,"text":"Waterbirds","onlineIssn":"19385390","printIssn":"15244695","active":true,"publicationSubtype":{"id":10}},"title":"Mercury and selenium in American White Pelicans breeding at Pyramid Lake, Nevada","docAbstract":"American White Pelicans (Pelecanus erythrorhynchos) that breed on Anaho Island, Pyramid Lake, Nevada, are potentially exposed to a variety of contaminants. Therefore, the reproductive success of this colony was monitored in 1996 and eggs, blood and feathers from nestlings, livers from adults and nestlings, regurgitated fish from nestlings, and fish from representative feeding areas were collected and analyzed for mercury and selenium to determine exposure to the pelicans and sources of contamination. Additional samples were collected and analyzed in 1988, 1992, and 2004. Reproductive success at the Anaho Island colony was normal in 1996 based on hatching rates of eggs (???75% in undisturbed areas) and survival of nestlings. Mercury and selenium concentrations in eggs were generally below known effect levels and did not appear to have an adverse impact on hatching success. Mercury and selenium concentrations in fish ranged widely, with mercury of greatest concern. Microscopic lesions characteristic of mercury toxicity were absent in pre-fledging nestlings in 1996. Some adult pelicans had elevated mercury concentrations in their livers; however, the potential toxic effects were difficult to evaluate because of probable demethylation of mercury, thereby possibly providing protection from toxicity. Exposure of pelicans to mercury varied among years, most likely in relation to wet-dry cycles and available feeding areas.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Waterbirds","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1675/1524-4695(2007)30[284:MASIAW]2.0.CO;2","issn":"15244695","usgsCitation":"Wiemeyer, S.N., Miesner, J., Tuttle, P.L., Murphy, E., Sileo, L., and Withers, D., 2007, Mercury and selenium in American White Pelicans breeding at Pyramid Lake, Nevada: Waterbirds, v. 30, no. 2, p. 284-295, https://doi.org/10.1675/1524-4695(2007)30[284:MASIAW]2.0.CO;2.","startPage":"284","endPage":"295","numberOfPages":"12","costCenters":[],"links":[{"id":212866,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1675/1524-4695(2007)30[284:MASIAW]2.0.CO;2"},{"id":240424,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"30","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a53e1e4b0c8380cd6cda2","contributors":{"authors":[{"text":"Wiemeyer, Stanley N.","contributorId":78279,"corporation":false,"usgs":true,"family":"Wiemeyer","given":"Stanley","email":"","middleInitial":"N.","affiliations":[],"preferred":false,"id":424699,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Miesner, J.F.","contributorId":79509,"corporation":false,"usgs":true,"family":"Miesner","given":"J.F.","email":"","affiliations":[],"preferred":false,"id":424700,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Tuttle, P. L.","contributorId":101280,"corporation":false,"usgs":true,"family":"Tuttle","given":"P.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":424702,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Murphy, E.C.","contributorId":86745,"corporation":false,"usgs":true,"family":"Murphy","given":"E.C.","email":"","affiliations":[],"preferred":false,"id":424701,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Sileo, L.","contributorId":46895,"corporation":false,"usgs":true,"family":"Sileo","given":"L.","email":"","affiliations":[],"preferred":false,"id":424698,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Withers, D.","contributorId":19370,"corporation":false,"usgs":true,"family":"Withers","given":"D.","email":"","affiliations":[],"preferred":false,"id":424697,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70029878,"text":"70029878 - 2007 - Development and implementation of a Bayesian-based aquifer vulnerability assessment in Florida","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029878","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2832,"text":"Natural Resources Research","onlineIssn":"1573-8981","printIssn":"1520-7439","active":true,"publicationSubtype":{"id":10}},"title":"Development and implementation of a Bayesian-based aquifer vulnerability assessment in Florida","docAbstract":"The Florida Aquifer Vulnerability Assessment (FAVA) was designed to provide a tool for environmental, regulatory, resource management, and planning professionals to facilitate protection of groundwater resources from surface sources of contamination. The FAVA project implements weights-of-evidence (WofE), a data-driven, Bayesian-probabilistic model to generate a series of maps reflecting relative aquifer vulnerability of Florida's principal aquifer systems. The vulnerability assessment process, from project design to map implementation is described herein in reference to the Floridan aquifer system (FAS). The WofE model calculates weighted relationships between hydrogeologic data layers that influence aquifer vulnerability and ambient groundwater parameters in wells that reflect relative degrees of vulnerability. Statewide model input data layers (evidential themes) include soil hydraulic conductivity, density of karst features, thickness of aquifer confinement, and hydraulic head difference between the FAS and the watertable. Wells with median dissolved nitrogen concentrations exceeding statistically established thresholds serve as training points in the WofE model. The resulting vulnerability map (response theme) reflects classified posterior probabilities based on spatial relationships between the evidential themes and training points. The response theme is subjected to extensive sensitivity and validation testing. Among the model validation techniques is calculation of a response theme based on a different water-quality indicator of relative recharge or vulnerability: dissolved oxygen. Successful implementation of the FAVA maps was facilitated by the overall project design, which included a needs assessment and iterative technical advisory committee input and review. Ongoing programs to protect Florida's springsheds have led to development of larger-scale WofE-based vulnerability assessments. Additional applications of the maps include land-use planning amendments and prioritization of land purchases to protect groundwater resources. ?? International Association for Mathematical Geology 2007.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Natural Resources Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s11053-007-9038-5","issn":"15207439","usgsCitation":"Arthur, J.D., Wood, H., Baker, A., Cichon, J., and Raines, G.L., 2007, Development and implementation of a Bayesian-based aquifer vulnerability assessment in Florida: Natural Resources Research, v. 16, no. 2, p. 93-107, https://doi.org/10.1007/s11053-007-9038-5.","startPage":"93","endPage":"107","numberOfPages":"15","costCenters":[],"links":[{"id":212867,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s11053-007-9038-5"},{"id":240425,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"16","issue":"2","noUsgsAuthors":false,"publicationDate":"2007-06-02","publicationStatus":"PW","scienceBaseUri":"505a0024e4b0c8380cd4f5ea","contributors":{"authors":[{"text":"Arthur, J. D.","contributorId":67924,"corporation":false,"usgs":true,"family":"Arthur","given":"J.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":424705,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wood, H.A.R.","contributorId":10623,"corporation":false,"usgs":true,"family":"Wood","given":"H.A.R.","email":"","affiliations":[],"preferred":false,"id":424703,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Baker, A.E.","contributorId":54022,"corporation":false,"usgs":true,"family":"Baker","given":"A.E.","email":"","affiliations":[],"preferred":false,"id":424704,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Cichon, J.R.","contributorId":68115,"corporation":false,"usgs":true,"family":"Cichon","given":"J.R.","email":"","affiliations":[],"preferred":false,"id":424706,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Raines, G. L.","contributorId":90720,"corporation":false,"usgs":true,"family":"Raines","given":"G.","middleInitial":"L.","affiliations":[],"preferred":false,"id":424707,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70029880,"text":"70029880 - 2007 - In situ hydrogen consumption kinetics as an indicator of subsurface microbial activity","interactions":[],"lastModifiedDate":"2018-10-17T12:44:23","indexId":"70029880","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1619,"text":"FEMS Microbiology Ecology","onlineIssn":"1574-6941","printIssn":"0168-6496","active":true,"publicationSubtype":{"id":10}},"title":"In situ hydrogen consumption kinetics as an indicator of subsurface microbial activity","docAbstract":"There are few methods available for broadly assessing microbial community metabolism directly within a groundwater environment. In this study, hydrogen consumption rates were estimated from in situ injection/withdrawal tests conducted in two geochemically varying, contaminated aquifers as an approach towards developing such a method. The hydrogen consumption first-order rates varied from 0.002 nM h-1 for an uncontaminated, aerobic site to 2.5 nM h-1 for a contaminated site where sulfate reduction was a predominant process. The method could accommodate the over three orders of magnitude range in rates that existed between subsurface sites. In a denitrifying zone, the hydrogen consumption rate (0.02 nM h-1) was immediately abolished in the presence of air or an antibiotic mixture, suggesting that such measurements may also be sensitive to the effects of environmental perturbations on field microbial activities. Comparable laboratory determinations with sediment slurries exhibited hydrogen consumption kinetics that differed substantially from the field estimates. Because anaerobic degradation of organic matter relies on the rapid consumption of hydrogen and subsequent maintenance at low levels, such in situ measures of hydrogen turnover can serve as a key indicator of the functioning of microbial food webs and may be more reliable than laboratory determinations.
","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"FEMS Microbiology Ecology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1111/j.1574-6941.2007.00286.x","issn":"01686496","usgsCitation":"Harris, S., Smith, R.L., and Suflita, J.M., 2007, In situ hydrogen consumption kinetics as an indicator of subsurface microbial activity: FEMS Microbiology Ecology, v. 60, no. 2, p. 220-228, https://doi.org/10.1111/j.1574-6941.2007.00286.x.","productDescription":"9 p.","startPage":"220","endPage":"228","numberOfPages":"9","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":487621,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1111/j.1574-6941.2007.00286.x","text":"Publisher Index Page"},{"id":212892,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1111/j.1574-6941.2007.00286.x"},{"id":240456,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"60","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a39a4e4b0c8380cd619b7","contributors":{"authors":[{"text":"Harris, S.H.","contributorId":10950,"corporation":false,"usgs":true,"family":"Harris","given":"S.H.","email":"","affiliations":[],"preferred":false,"id":424712,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, Richard L. 0000-0002-3829-0125 rlsmith@usgs.gov","orcid":"https://orcid.org/0000-0002-3829-0125","contributorId":1592,"corporation":false,"usgs":true,"family":"Smith","given":"Richard","email":"rlsmith@usgs.gov","middleInitial":"L.","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":36183,"text":"Hydro-Ecological Interactions Branch","active":true,"usgs":true},{"id":38175,"text":"Toxics Substances Hydrology Program","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":true,"id":424714,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Suflita, Joseph M.","contributorId":187604,"corporation":false,"usgs":false,"family":"Suflita","given":"Joseph","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":424713,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029953,"text":"70029953 - 2007 - Source parameters of a M4.8 and its accompanying repeating earthquakes off Kamaishi, NE Japan: Implications for the hierarchical structure of asperities and earthquake cycle","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029953","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1807,"text":"Geophysical Research Letters","active":true,"publicationSubtype":{"id":10}},"title":"Source parameters of a M4.8 and its accompanying repeating earthquakes off Kamaishi, NE Japan: Implications for the hierarchical structure of asperities and earthquake cycle","docAbstract":"We determine the source parameters of a M4.9 ?? 0.1 'characteristic earthquake' sequence and its accompanying microearthquakes at ???50 km depth on the subduction plate boundary offshore of Kamaishi, NE Japan. The microearthquakes tend to occur more frequently in the latter half of the recurrence intervals of the M4.9 ?? 0.1 events. Our results show that the microearthquakes are repeating events and they are located not only around but also within the slip area for the 2001 M4.8 event. From the hierarchical structure of slip areas and smaller stress drops for the microearthquakes compared to the M4.8 event, we infer the small repeating earthquakes rupture relatively weak patches in and around the slip area for the M4.8 event and their activity reflects a stress concentration process and/or change in frictional property (healing) at the area. We also infer the patches for the M4.9 ?? 0.1 and other repeating earthquakes undergo aseismic slip during their interseismic period. Copyright 2007 by the American Geophysical Union.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geophysical Research Letters","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1029/2007GL031263","issn":"00948276","usgsCitation":"Uchida, N., Matsuzawa, T., Ellsworth, W., Imanishi, K., Okada, T., and Hasegawa, A., 2007, Source parameters of a M4.8 and its accompanying repeating earthquakes off Kamaishi, NE Japan: Implications for the hierarchical structure of asperities and earthquake cycle: Geophysical Research Letters, v. 34, no. 20, https://doi.org/10.1029/2007GL031263.","costCenters":[],"links":[{"id":477217,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2007gl031263","text":"Publisher Index Page"},{"id":213008,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2007GL031263"},{"id":240588,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"34","issue":"20","noUsgsAuthors":false,"publicationDate":"2007-10-31","publicationStatus":"PW","scienceBaseUri":"505b9338e4b08c986b31a38f","contributors":{"authors":[{"text":"Uchida, N.","contributorId":101088,"corporation":false,"usgs":true,"family":"Uchida","given":"N.","email":"","affiliations":[],"preferred":false,"id":425049,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Matsuzawa, T.","contributorId":11804,"corporation":false,"usgs":true,"family":"Matsuzawa","given":"T.","affiliations":[],"preferred":false,"id":425046,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ellsworth, W.L.","contributorId":48541,"corporation":false,"usgs":true,"family":"Ellsworth","given":"W.L.","email":"","affiliations":[],"preferred":false,"id":425047,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Imanishi, K.","contributorId":51956,"corporation":false,"usgs":true,"family":"Imanishi","given":"K.","affiliations":[],"preferred":false,"id":425048,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Okada, T.","contributorId":10626,"corporation":false,"usgs":true,"family":"Okada","given":"T.","email":"","affiliations":[],"preferred":false,"id":425045,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Hasegawa, A.","contributorId":6264,"corporation":false,"usgs":true,"family":"Hasegawa","given":"A.","email":"","affiliations":[],"preferred":false,"id":425044,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70029881,"text":"70029881 - 2007 - Characterization of suspended particles in Everglades wetlands","interactions":[],"lastModifiedDate":"2018-10-16T11:02:45","indexId":"70029881","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2620,"text":"Limnology and Oceanography","active":true,"publicationSubtype":{"id":10}},"title":"Characterization of suspended particles in Everglades wetlands","docAbstract":"We report the concentration, phosphorus (P) and nitrogen (N) content, and size and chemical fractionation of fine suspended particles (0.2‐100 µm) and colloids (3 kilodalton [kDa]‐0.1 µm) in the surface water of Everglades wetlands along regional and P‐enrichment gradients. Total suspended sediment concentrations ranged from 0.7 to 2.7 mg L−1. Total particulate P concentrations increased from 0.05 µmol L21 to 0.31 µmol L−1along the Penrichment gradient. Particles contained from 20% to 43% of total P but <12% of total N in surface water. Dissolved (<0.2 µm) organic N contained about 90% of total N, with the 3‐100‐kDa colloidal size class containing the most N of any size class. The 0.45‐2.7‐µm size fraction held the most particulate P at all sites, whereas particulate N was most abundant in the 2.7‐10‐µm size class at most sites. Standard chemical fractionation of particles identified acid‐hydrolyzable P as the most abundant species of particulate P, with little reactive or refractory organic P. Sequential chemical extraction revealed that about 65% of total particulate P was microbial, while about 25% was associated with humic and fulvic organic matter. The size and chemical fractionation information suggested that P‐rich particles mostly consisted of suspended bacteria. Suspended particles in Everglades wetlands were small in size and had low concentrations, yet they stored a large proportion of surface‐water P in intermediately reactive forms, but they held little N.
","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Limnology and Oceanography","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.4319/lo.2007.52.3.1166","issn":"00243590","usgsCitation":"Noe, G., Harvey, J.W., and Saiers, J.E., 2007, Characterization of suspended particles in Everglades wetlands: Limnology and Oceanography, v. 52, no. 3, p. 1166-1178, https://doi.org/10.4319/lo.2007.52.3.1166.","productDescription":"13 p.","startPage":"1166","endPage":"1178","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":477128,"rank":1,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.715.2908","text":"External Repository"},{"id":240457,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":265987,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.4319/lo.2007.52.3.1166"}],"country":"United States","state":"Florida","otherGeospatial":"Everglades wetlands","volume":"52","issue":"3","noUsgsAuthors":false,"publicationDate":"2007-05-17","publicationStatus":"PW","scienceBaseUri":"5059f4dfe4b0c8380cd4bf8c","contributors":{"authors":[{"text":"Noe, Gregory B. 0000-0002-6661-2646 gnoe@usgs.gov","orcid":"https://orcid.org/0000-0002-6661-2646","contributorId":2332,"corporation":false,"usgs":true,"family":"Noe","given":"Gregory","email":"gnoe@usgs.gov","middleInitial":"B.","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":false,"id":424717,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Harvey, Judson W. 0000-0002-2654-9873 jwharvey@usgs.gov","orcid":"https://orcid.org/0000-0002-2654-9873","contributorId":1796,"corporation":false,"usgs":true,"family":"Harvey","given":"Judson","email":"jwharvey@usgs.gov","middleInitial":"W.","affiliations":[{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":true,"id":424715,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Saiers, James E.","contributorId":191842,"corporation":false,"usgs":false,"family":"Saiers","given":"James","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":424716,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029883,"text":"70029883 - 2007 - Geochemical proxies of North American freshwater routing during the Younger Dryas cold event","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029883","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3165,"text":"Proceedings of the National Academy of Sciences of the United States of America","active":true,"publicationSubtype":{"id":10}},"title":"Geochemical proxies of North American freshwater routing during the Younger Dryas cold event","docAbstract":"The Younger Dryas cold interval represents a time when much of the Northern Hemisphere cooled from ???12.9 to 11.5 kiloyears B.P. The cause of this event, which has long been viewed as the canonical example of abrupt climate change, was initially attributed to the routing of freshwater to the St. Lawrence River with an attendant reduction in Atlantic meridional overturning circulation. However, this mechanism has recently been questioned because current proxies and dating techniques have been unable to confirm that eastward routing with an increase in freshwater flux occurred during the Younger Dryas. Here we use new geochemical proxies (??Mg/Ca, U/Ca, and 87Sr/86Sr) measured in planktonic foraminifera at the mouth of the St. Lawrence estuary as tracers of freshwater sources to further evaluate this question. Our proxies, combined with planktonic ??18Oseawater and ??13C, confirm that routing of runoff from western Canada to the St. Lawrence River occurred at the start of the Younger Dryas, with an attendant increase in freshwater flux of 0.06 ?? 0.02 Sverdrup (1 Sverdrup = 106 m3??s-1). This base discharge increase is sufficient to have reduced Atlantic meridional overturning circulation and caused the Younger Dryas cold interval. In addition, our data indicate subsequent fluctuations in the freshwater flux to the St. Lawrence River of ???0.06-0.12 Sverdrup, thus explaining the variability in the overturning circulation and climate during the Younger Dryas. ?? 2007 by The National Academy of Sciences of the USA.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Proceedings of the National Academy of Sciences of the United States of America","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1073/pnas.0611313104","issn":"00278424","usgsCitation":"Carlson, A., Clark, P., Haley, B., Klinkhammer, G., Simmons, K., Brook, E., and Meissner, K.J., 2007, Geochemical proxies of North American freshwater routing during the Younger Dryas cold event: Proceedings of the National Academy of Sciences of the United States of America, v. 104, no. 16, p. 6556-6561, https://doi.org/10.1073/pnas.0611313104.","startPage":"6556","endPage":"6561","numberOfPages":"6","costCenters":[],"links":[{"id":477060,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"http://doi.org/10.1073/pnas.0611313104","text":"External Repository"},{"id":212924,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1073/pnas.0611313104"},{"id":240491,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"104","issue":"16","noUsgsAuthors":false,"publicationDate":"2007-04-17","publicationStatus":"PW","scienceBaseUri":"505a1696e4b0c8380cd551d4","contributors":{"authors":[{"text":"Carlson, A.E.","contributorId":54825,"corporation":false,"usgs":true,"family":"Carlson","given":"A.E.","email":"","affiliations":[],"preferred":false,"id":424725,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Clark, P.U.","contributorId":78449,"corporation":false,"usgs":true,"family":"Clark","given":"P.U.","email":"","affiliations":[],"preferred":false,"id":424727,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Haley, B.A.","contributorId":52047,"corporation":false,"usgs":true,"family":"Haley","given":"B.A.","email":"","affiliations":[],"preferred":false,"id":424724,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Klinkhammer, G.P.","contributorId":86232,"corporation":false,"usgs":true,"family":"Klinkhammer","given":"G.P.","email":"","affiliations":[],"preferred":false,"id":424728,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Simmons, K.","contributorId":75333,"corporation":false,"usgs":true,"family":"Simmons","given":"K.","affiliations":[],"preferred":false,"id":424726,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Brook, E.J.","contributorId":23292,"corporation":false,"usgs":true,"family":"Brook","given":"E.J.","email":"","affiliations":[],"preferred":false,"id":424722,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Meissner, K. J.","contributorId":29704,"corporation":false,"usgs":false,"family":"Meissner","given":"K.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":424723,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70029884,"text":"70029884 - 2007 - Fractal topography and subsurface water flows from fluvial bedforms to the continental shield","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029884","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1807,"text":"Geophysical Research Letters","active":true,"publicationSubtype":{"id":10}},"title":"Fractal topography and subsurface water flows from fluvial bedforms to the continental shield","docAbstract":"Surface-subsurface flow interactions are critical to a wide range of geochemical and ecological processes and to the fate of contaminants in freshwater environments. Fractal scaling relationships have been found in distributions of both land surface topography and solute efflux from watersheds, but the linkage between those observations has not been realized. We show that the fractal nature of the land surface in fluvial and glacial systems produces fractal distributions of recharge, discharge, and associated subsurface flow patterns. Interfacial flux tends to be dominated by small-scale features while the flux through deeper subsurface flow paths tends to be controlled by larger-scale features. This scaling behavior holds at all scales, from small fluvial bedforms (tens of centimeters) to the continental landscape (hundreds of kilometers). The fractal nature of surface-subsurface water fluxes yields a single scale-independent distribution of subsurface water residence times for both near-surface fluvial systems and deeper hydrogeological flows. Copyright 2007 by the American Geophysical Union.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geophysical Research Letters","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1029/2007GL029426","issn":"00948276","usgsCitation":"Worman, A., Packman, A., Marklund, L., Harvey, J., and Stone, S., 2007, Fractal topography and subsurface water flows from fluvial bedforms to the continental shield: Geophysical Research Letters, v. 34, no. 7, https://doi.org/10.1029/2007GL029426.","costCenters":[],"links":[{"id":212952,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2007GL029426"},{"id":240522,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"34","issue":"7","noUsgsAuthors":false,"publicationDate":"2007-04-04","publicationStatus":"PW","scienceBaseUri":"505a13a5e4b0c8380cd5470b","contributors":{"authors":[{"text":"Worman, A.","contributorId":105534,"corporation":false,"usgs":true,"family":"Worman","given":"A.","email":"","affiliations":[],"preferred":false,"id":424733,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Packman, A.I.","contributorId":37539,"corporation":false,"usgs":true,"family":"Packman","given":"A.I.","email":"","affiliations":[],"preferred":false,"id":424729,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Marklund, L.","contributorId":69786,"corporation":false,"usgs":true,"family":"Marklund","given":"L.","affiliations":[],"preferred":false,"id":424732,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Harvey, J. W. 0000-0002-2654-9873","orcid":"https://orcid.org/0000-0002-2654-9873","contributorId":39725,"corporation":false,"usgs":true,"family":"Harvey","given":"J. W.","affiliations":[],"preferred":false,"id":424730,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Stone, S.H.","contributorId":48763,"corporation":false,"usgs":true,"family":"Stone","given":"S.H.","email":"","affiliations":[],"preferred":false,"id":424731,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70029885,"text":"70029885 - 2007 - Stress before and after the 2002 Denali fault earthquake","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029885","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1807,"text":"Geophysical Research Letters","active":true,"publicationSubtype":{"id":10}},"title":"Stress before and after the 2002 Denali fault earthquake","docAbstract":"Spatially averaged, absolute deviatoric stress tensors along the faults ruptured during the 2002 Denali fault earthquake, both before and after the event, are derived, using a new method, from estimates of the orientations of the principal stresses and the stress change associated with the earthquake. Stresses are estimated in three regions along the Denali fault, one of which also includes the Susitna Glacier fault, and one region along the Totschunda fault. Estimates of the spatially averaged shear stress before the earthquake resolved onto the faults that ruptured during the event range from near 1 MPa to near 4 MPa. Shear stresses estimated along the faults in all these regions after the event are near zero (0 ?? 1 MPa). These results suggest that deviatoric stresses averaged over a few tens of km along strike are low, and that the stress drop during the earthquake was complete or nearly so.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geophysical Research Letters","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1029/2007GL029189","issn":"00948276","usgsCitation":"Wesson, R.L., and Boyd, O., 2007, Stress before and after the 2002 Denali fault earthquake: Geophysical Research Letters, v. 34, no. 7, https://doi.org/10.1029/2007GL029189.","costCenters":[],"links":[{"id":477250,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2007gl029189","text":"Publisher Index Page"},{"id":212953,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2007GL029189"},{"id":240523,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"34","issue":"7","noUsgsAuthors":false,"publicationDate":"2007-04-10","publicationStatus":"PW","scienceBaseUri":"505b9b51e4b08c986b31cdd3","contributors":{"authors":[{"text":"Wesson, R. L.","contributorId":51752,"corporation":false,"usgs":true,"family":"Wesson","given":"R.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":424734,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Boyd, O.S.","contributorId":74479,"corporation":false,"usgs":true,"family":"Boyd","given":"O.S.","email":"","affiliations":[],"preferred":false,"id":424735,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029886,"text":"70029886 - 2007 - The relationship between productivities of salmonids and forest stands in northern California watersheds","interactions":[],"lastModifiedDate":"2013-03-24T15:08:02","indexId":"70029886","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3744,"text":"Western Journal of Applied Forestry","active":true,"publicationSubtype":{"id":10}},"title":"The relationship between productivities of salmonids and forest stands in northern California watersheds","docAbstract":"Productivities of resident salmonids and upland and riporian forests in 22 small watersheds of coastal northern California were estimated and compared to determine whether: 1) upland site productivity predicted riparian site productivity; 2) either upland or riparian site productivity predicted salmonid productivity; and 3) other parameters explained more of the variance in salmonid productivity. Upland and riparian site productivities were estimated using Site Index values for redwood (Sequoia sempervirens) and red alder (Alnus rubra), respectively. Salmonid productivity was indexed by back-calculated length at age 1 of the largest individuals sampled and by total biomass. Upland and riparian site indices were correlated, but neither factor contributed to the best approximating models of salmonid productivity. Total salmonid biomass was best described by a positive relationship with drainage area. Length of dominant fish was best described by a positive relationship with percentage of hardwoods within riparian areas, which may result from nutrient and/or litter subsidies provided by red older. The inability of forest productivity to predict salmon productivity may reflect insufficient variation in independent variables, limitations of the indices, and the operation of other factors affecting salmonid production. The lack of an apparent relationship between upland conifer and salmonid productivity suggests that management of land for timber productivity and component streams for salmonid production in these sites will require separate, albeit integrated, management strategies.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Western Journal of Applied Forestry","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"08856095","usgsCitation":"Frazey, S., and Wilzbach, M., 2007, The relationship between productivities of salmonids and forest stands in northern California watersheds: Western Journal of Applied Forestry, v. 22, no. 2, p. 73-80.","startPage":"73","endPage":"80","numberOfPages":"8","costCenters":[],"links":[{"id":240524,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":269924,"type":{"id":11,"text":"Document"},"url":"https://www.humboldt.edu/cuca/documents/publications/WJAF07.pdf"}],"volume":"22","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505baf1be4b08c986b324559","contributors":{"authors":[{"text":"Frazey, S.L.","contributorId":93705,"corporation":false,"usgs":true,"family":"Frazey","given":"S.L.","email":"","affiliations":[],"preferred":false,"id":424737,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wilzbach, M.A.","contributorId":48505,"corporation":false,"usgs":true,"family":"Wilzbach","given":"M.A.","affiliations":[],"preferred":false,"id":424736,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70197419,"text":"70197419 - 2007 - Review of A. Kääb, 2005. Remote sensing of mountain glaciers and permafrost creep","interactions":[],"lastModifiedDate":"2022-03-29T16:09:27.173788","indexId":"70197419","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2328,"text":"Journal of Glaciology","active":true,"publicationSubtype":{"id":10}},"title":"Review of A. Kääb, 2005. Remote sensing of mountain glaciers and permafrost creep","docAbstract":"No abstract available.
","language":"English","publisher":"International Glaciological Society","doi":"10.3189/172756507781833857","usgsCitation":"Williams, R.S., 2007, Review of A. Kääb, 2005. Remote sensing of mountain glaciers and permafrost creep: Journal of Glaciology, v. 53, no. 180, https://doi.org/10.3189/172756507781833857.","productDescription":"1 p.","startPage":"153","costCenters":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":477152,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.3189/172756507781833857","text":"Publisher Index Page"},{"id":354674,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"53","issue":"180","noUsgsAuthors":false,"publicationDate":"2017-09-08","publicationStatus":"PW","scienceBaseUri":"5b15772be4b092d9651e1f45","contributors":{"authors":[{"text":"Williams, R. S. Jr.","contributorId":119999,"corporation":false,"usgs":true,"family":"Williams","given":"R.","suffix":"Jr.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":737098,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":80808,"text":"ofr20071361 - 2007 - Applying radar technology to migratory bird conservation and management: Strengthening and expanding a collaborative","interactions":[],"lastModifiedDate":"2018-01-01T16:59:36","indexId":"ofr20071361","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2007-1361","title":"Applying radar technology to migratory bird conservation and management: Strengthening and expanding a collaborative","docAbstract":"Understanding the factors affecting migratory bird and bat populations during all three phases of their life cycle—breeding, nonbreeding, and migration—is critical to species conservation planning. This includes the need for information about these species’ responses to natural challenges, as well as information about the effects of human activities and structures. Habitats and other resources critical to migrants during passage and stopover are being destroyed, degraded, and threatened by human activities. Birds and bats are also uniquely susceptible to human use of the airspace. Wind turbines, communication and power transmission towers, and other tall structures, known to cause bird and bat mortality, are being erected or proposed in increasing numbers across the country. In addition, the potential for bird/aircraft collisions poses human safety threats. Management and regulatory agencies, conservation organizations, and industry currently lack the information they need to meet their missions and statutory responsibilities. The biological data available from various radar technologies offer a unique opportunity to learn more about the spatiotemporal distribution patterns, flight characteristics, and habitat use of “aero-fauna.”
\nRecognizing the opportunities presented by radar technologies, the U.S. Geological Survey (USGS), the U.S. Fish and Wildlife Service (USFWS), and university partners collaborated first on individual projects and then in a broader, informal “collaborative” to coordinate their radar-related research and work together to develop the suite of products needed for conservation of birds and bats. Having produced two summary documents (Sojda and others, 2005; Ruth and others, 2005), the next objective was to convene a workshop for researchers, management and regulatory agencies, and other interested parties. The focus of this initial workshop was on strengthening the existing USGS-USFWS-university partnership and expanding the “collaborative” to include new Federal agency partners. The subject matter was centered on discussing available technologies, appropriate applications, management-related needs, and ways to strengthen collaborative research and conservation efforts.
\nThe workshop opened with presentations about the history of the “radar collaborative,” a description of the workshop objectives and focuses, and a summary of resource management and regulatory needs. Scientific presentations describing current research projects or subjects followed, given by USGS scientists, as well as scientists from other Federal agencies, academia, conservation and ornithological organizations, and a private contracting firm. Presenters addressed a wide variety of management issues including siting of wind-power facilities, bird/aircraft collisions, effects of hurricanes Katrina and Rita on bird migration, bird use of Conservation Reserve Program land, defining bird migration patterns at a broad regional scale, and associating migrant birds with their stopover habitats. Presentations described a variety of radar technologies including NEXRAD weather surveillance radar, modified mobile marine radar, military tracking radar, pencil beam radar, and dual polarization radar, as well as complementary techniques and analysis methods such as acoustic monitoring, thermal imaging, artificial intelligence, and individual-based modeling.
\nKey issues, themes, and questions identified during the open discussions that followed fell into five main categories: (1) agency needs and challenges; (2) radar technology and applications—technical questions and issues; (3) tools and resources for managers and researchers; (4) standardization of protocols; and (5) collaborative opportunities. Participants identified the following management, regulatory, or business issues facing them which may be addressed with radar technologies: tall structures; wind turbines; identification and protection of key habitats; assessment of management activities; and bird/aircraft strikes. Participants frequently expressed the need for specific information about which radar technologies are best used for answering particular questions. User groups emphasized the importance of clear, defensible scientific information on which they can base their activities. In turn, researchers emphasized their need for clearly defined, specific questions from managers so that they can design and conduct the required research. Discussions about technical issues requiring further research and collaboration included target identity, ground-truthing, linking migrants to habitat, and standardized protocols for applied research.
\nWorkshop participants identified and endorsed a series of seven action items that would promote collaboration and begin to address key issues identified at the workshop:
\nAction Item #1: Establish a working subgroup to address large-scale surveillance radar standardization issues.
Action Item #2: Establish a working subgroup to address small-scale radar standardization issues.
Action Item #3: Bring management and regulatory agencies together to identify the three most important information needs for each key management issue relating to radar technologies.
Action Item #4: Develop Fact Sheet(s) to provide information about radar technology applications to migratory bird and bat conservation issues.
Action Item #5: Create a “radar collaborative” Website to provide information about radar biology applications, contacts, publications, and so forth.
Action Item #6: Formalize and expand the USGS-USFWS “radar collaborative.”
Action Item #7: Advance basic research, such as target identity and validation, which will support and improve our abilities to apply radar technologies to conservation objectives.
There was considerable interest in expanding the “radar collaborative” to include those agencies, organizations, and industries represented at the workshop. It was felt that the publication of the workshop proceedings, implementation of action items, and additional future meetings or workshops will be crucial in strengthening the “radar collaborative” effort and promoting the use of these valuable technologies for conserving migratory species.
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In the western entrance and central, western and eastern parts, where salinities vary from 18 to 30 psu and the sediments contain both low and high organic carbon, the foraminifera from Facies 3 are dominated by Quinqueloculina milletti, Arenoparrella mexicana, Pararotalia cananeiaensis, Ammonia beccarii, Buliminella elegantissima, Elphidium sp., Elphidium excavatum, Elphidium gunteri and Elphidium poeyanum. In mesohaline and polyhaline waters of the central part, the organic-carbon-rich silt and clay contain Facies 4, which includes Ammonia beccarii, Pararotalia cananeiaensis, Elphidium excavatum and Elphidium sp. Most of organic-carbon-enriched, silty-clay substrates that are subject to the highest fresh-water discharge and high bottom temperatures support two different assemblages: one of mostly Rotaliina and the other mostly of Textulariida (Facies 5 and 6). Facies 5 includes Ammonia beecarii, Elphidium excavatum, Arenoparrella mexicana, Haplophragmoides wilberti, Siphotrochammina lobata, Trochammina inflata and Trochammina sp., all of which are typical of mesohaline sites (mainly Crumau?? and Trindade rivers), and Facies 6 includes Bolivina sp., Ammoastuta salsa, Arenoparrella mexicana, Haplophragmoides wilberti and Trochammina sp., all of which are typical of oligohaline and mesohaline mangrove fringes. 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