{"pageNumber":"934","pageRowStart":"23325","pageSize":"25","recordCount":46734,"records":[{"id":70175722,"text":"70175722 - 2006 - Evaluating light-based geolocation for estimating demersal fish movements in high latitudes","interactions":[],"lastModifiedDate":"2017-02-27T14:38:35","indexId":"70175722","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1663,"text":"Fishery Bulletin","printIssn":"0090-0656","active":true,"publicationSubtype":{"id":10}},"title":"Evaluating light-based geolocation for estimating demersal fish movements in high latitudes","docAbstract":"

We evaluated light-based geolocation estimates from pop-up satellite tags in high latitudes because some of the largest fisheries in the world are in areas where this technique has not been assessed. Daily longitude and latitude were estimated by using two Wildlife Computers software programs: 1) Argos Message Processor (AMP), which summarizes light intensity data transmitted to satellites, and 2) Time Series Processor (TSP), which uses more detailed data obtained from retrieved tags. Three experiments were conducted in the northern Gulf of Alaska using tags placed on 1) Pacific halibut in outdoor aquaria, 2) a fixed mooring line at various depths and 3) wild Pacific halibut. TSP performed better than AMP because the percentage of days with geolocation estimates was greater and the mean error magnitude and bias were smaller for TSP and increased with depth for both programs; however, latitude errors were much greater than longitude errors at all depths. Light-based geolocation enabled us to discern basin-scale movements and showed that the Pacific halibut in our study remained within the Gulf of Alaska. We conclude that this technique provides a feasible method for inferring large-scale population structure for demersal fishes in high latitudes. 

","language":"English","publisher":"NOAA National Marine Fisheries Service","issn":"0090-0656","usgsCitation":"Seitz, A.C., Norcross, B.L., Wilson, D., and Nielsen, J.L., 2006, Evaluating light-based geolocation for estimating demersal fish movements in high latitudes: Fishery Bulletin, v. 104, no. 4, p. 571-578.","productDescription":"8 p.","startPage":"571","endPage":"578","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":326828,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":336100,"rank":2,"type":{"id":15,"text":"Index Page"},"url":"https://fishbull.noaa.gov/1044/1044toc.htm","text":"Fishery Bulletin: Volume 104, Issue 4"}],"country":"United States","state":"Alaska","otherGeospatial":"Gulf of Alaska","volume":"104","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"57b6dc5ae4b03fd6b7d94c3b","contributors":{"authors":[{"text":"Seitz, Andrew C.","contributorId":156324,"corporation":false,"usgs":true,"family":"Seitz","given":"Andrew","email":"","middleInitial":"C.","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":6752,"text":"University of Alaska Fairbanks","active":true,"usgs":false}],"preferred":false,"id":646188,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Norcross, Brenda L.","contributorId":21497,"corporation":false,"usgs":false,"family":"Norcross","given":"Brenda","email":"","middleInitial":"L.","affiliations":[{"id":7211,"text":"University of Alaska, Fairbanks","active":true,"usgs":false}],"preferred":false,"id":646189,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wilson, Derek","contributorId":178950,"corporation":false,"usgs":true,"family":"Wilson","given":"Derek","email":"","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"preferred":false,"id":646190,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Nielsen, Jennifer L.","contributorId":43722,"corporation":false,"usgs":true,"family":"Nielsen","given":"Jennifer","email":"","middleInitial":"L.","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"preferred":true,"id":646191,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70028071,"text":"70028071 - 2006 - Relevance of cryptic fishes in biodiversity assessments: A case study at Buck Island Reef National Monument, St. Croix","interactions":[],"lastModifiedDate":"2012-03-12T17:20:51","indexId":"70028071","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1106,"text":"Bulletin of Marine Science","active":true,"publicationSubtype":{"id":10}},"title":"Relevance of cryptic fishes in biodiversity assessments: A case study at Buck Island Reef National Monument, St. Croix","docAbstract":"Because cryptic fishes are difficult to accurately survey, they are undersampled components of coral reef habitats, and their ecological roles have been generally ignored. Fifty-eight enclosed stations were sampled in shoreline, nearshore reef, lagoon, backreef, forereef, and bank/shelf habitats with an ichthyocide (rotenone) at Buck Island Reef National Monument, St. Croix, U.S. Virgin Islands. Our samples included 55 families and 228 species, 60 previously unreported from St. Croix. Fish assemblages varied across habitat zones with the shoreline assemblage the most distinct. Only 8% of the species were present in all habitats. Multi-dimensional scaling plots of habitat characteristics and Bray-Curtis similarities of fish assemblages revealed similar patterns. Dominant and rare taxa are enumerated for each habitat sampled. Rotenone and visual census data are compared. While visual surveys accumulated more species per unit of effort, rotenone samples accumulated more species by area. Only 36% of the 228 species sampled with rotenone were visually detected, while 70% of the 115 species visually detected were also collected with rotenone. The use of rotenone is controversial but important for obtaining reasonably complete inventories of reef fishes. Misconceptions about rotenone and the advantages and limitations of alternative biodiversity assessment methods are discussed. ?? 2006 Rosenstiel School of Marine and Atmospheric Science of the University of Miami.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Bulletin of Marine Science","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"00074977","usgsCitation":"Smith-Vaniz, W., Jelks, H., and Rocha, L., 2006, Relevance of cryptic fishes in biodiversity assessments: A case study at Buck Island Reef National Monument, St. Croix: Bulletin of Marine Science, v. 79, no. 1, p. 17-48.","startPage":"17","endPage":"48","numberOfPages":"32","costCenters":[],"links":[{"id":237294,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"79","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505aa6b5e4b0c8380cd84fdc","contributors":{"authors":[{"text":"Smith-Vaniz, W. F.","contributorId":20684,"corporation":false,"usgs":true,"family":"Smith-Vaniz","given":"W. F.","affiliations":[],"preferred":false,"id":416410,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Jelks, H.L. 0000-0002-0672-6297","orcid":"https://orcid.org/0000-0002-0672-6297","contributorId":12000,"corporation":false,"usgs":true,"family":"Jelks","given":"H.L.","affiliations":[],"preferred":false,"id":416409,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Rocha, L.A.","contributorId":52780,"corporation":false,"usgs":true,"family":"Rocha","given":"L.A.","email":"","affiliations":[],"preferred":false,"id":416411,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70028898,"text":"70028898 - 2006 - Abundance and distribution of selected elements in soils, stream sediments, and selected forage plants from desert tortoise habitats in the Mojave and Colorado deserts, USA","interactions":[],"lastModifiedDate":"2012-03-12T17:20:41","indexId":"70028898","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2183,"text":"Journal of Arid Environments","active":true,"publicationSubtype":{"id":10}},"title":"Abundance and distribution of selected elements in soils, stream sediments, and selected forage plants from desert tortoise habitats in the Mojave and Colorado deserts, USA","docAbstract":"A baseline and background chemical survey was conducted in southeastern California, USA, to identify potential sources of toxicants in natural and anthropogenically-altered habitats of the threatened desert tortoise (Gopherus agassizii). Soil, stream sediment, and plant samples were collected from six tortoise habitat study areas in the Mojave and Colorado deserts and analysed for up to 66 different elements. The chemical analyses provided new information on the abundances and distributions of selected elements in this region. Soil, stream-sediment, and plant analyses showed distinct variations in bulk chemistries from locality to locality. Variations were, in general, consistent with the many types of exposed rock units in the region, their highly variable bulk mineralogies, and chemical contents. Of elements in soils that might have been toxic to tortoises, only As seemed to be anomalous region-wide. Some soil and plant anomalies were clearly anthropogenic. In the Rand and Atolia mining districts, soil anomalies for As, Au, Cd, Hg, Sb, and(or) W and plant anomalies for As, Sb, and(or) W extend as far as ???15 km outward from the present area of mining; soils containing anomalous Hg were found at least 6 km away from old piles of tailings. The anomalous concentrations of As and Hg may have been the source of elevated levels of these elements found in ill tortoises from the region. In the Goldstone mining district, soil anomalies extended several km from the mining area. These areas probably represented anthropogenic surface contamination of dust redistributed by wind, vehicles, and rainfall. One of two study areas transected by a paved road (Chemehuevi Valley) showed weakly elevated levels of Pb, which extended as far as ???22 m from the pavement edge and were probably related to vehicle exhaust. No soil or plant samples from historically used military areas (Goldstone, Goffs, Chemehuevi Valley, Chuckwalla Bench) contained anomalous concentrations of the elements As, Cu, Cr, Fe, Pb, or Zn that could be ascribed to military maneuvers, vehicles, or ordnance. For future studies, the distribution and abundance of elements in the tortoise forage plants need to be evaluated for the respective roles of dust and systemic uptake. Additional chemical data from tortoise necropsies and nutritional studies are needed to determine the effects of potentially toxic elements in tortoise habitats on their health. ?? 2006 Elsevier Ltd. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Arid Environments","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.jaridenv.2006.09.018","issn":"01401963","usgsCitation":"Chaffee, M., and Berry, K., 2006, Abundance and distribution of selected elements in soils, stream sediments, and selected forage plants from desert tortoise habitats in the Mojave and Colorado deserts, USA: Journal of Arid Environments, v. 67, no. SUPPL., p. 35-87, https://doi.org/10.1016/j.jaridenv.2006.09.018.","startPage":"35","endPage":"87","numberOfPages":"53","costCenters":[],"links":[{"id":209906,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jaridenv.2006.09.018"},{"id":236656,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"67","issue":"SUPPL.","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e659e4b0c8380cd47365","contributors":{"authors":[{"text":"Chaffee, M.A.","contributorId":108049,"corporation":false,"usgs":true,"family":"Chaffee","given":"M.A.","affiliations":[],"preferred":false,"id":420404,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Berry, K.H.","contributorId":17934,"corporation":false,"usgs":true,"family":"Berry","given":"K.H.","email":"","affiliations":[],"preferred":false,"id":420403,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70028802,"text":"70028802 - 2006 - Effects of human recreation on the incubation behavior of American Oystercatchers","interactions":[],"lastModifiedDate":"2012-03-12T17:20:44","indexId":"70028802","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3784,"text":"Wilson Journal of Ornithology","active":true,"publicationSubtype":{"id":10}},"title":"Effects of human recreation on the incubation behavior of American Oystercatchers","docAbstract":"Human recreational disturbance and its effects on wildlife demographics and behavior is an increasingly important area of research. We monitored the nesting success of American Oystercatchers (Haematopus palliatus) in coastal North Carolina in 2002 and 2003. We also used video monitoring at nests to measure the response of incubating birds to human recreation. We counted the number of trips per hour made by adult birds to and from the nest, and we calculated the percent time that adults spent incubating. We asked whether human recreational activities (truck, all-terrain vehicle [ATV], and pedestrian traffic) were correlated with parental behavioral patterns. Eleven a priori models of nest survival and behavioral covariates were evaluated using Akaike's Information Criterion (AIC) to see whether incubation behavior influenced nest survival. Factors associated with birds leaving their nests (n = 548) included ATV traffic (25%), truck traffic (17%), pedestrian traffic (4%), aggression with neighboring oystercatchers or paired birds exchanging incubation duties (26%), airplane traffic (1%) and unknown factors (29%). ATV traffic was positively associated with the rate of trips to and away from the nest (??1 = 0.749, P < 0.001) and negatively correlated with percent time spent incubating (??1 = -0.037, P = 0.025). Other forms of human recreation apparently had little effect on incubation behaviors. Nest survival models incorporating the frequency of trips by adults to and from the nest, and the percentage of time adults spent incubating, were somewhat supported in the AIC analyses. A low frequency of trips to and from the nest and, counter to expectations, low percent time spent incubating were associated with higher daily nest survival rates. These data suggest that changes in incubation behavior might be one mechanism by which human recreation affects the reproductive success of American Oystercatchers.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Wilson Journal of Ornithology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1676/05-084.1","issn":"15594491","usgsCitation":"McGowan, C., and Simons, T., 2006, Effects of human recreation on the incubation behavior of American Oystercatchers: Wilson Journal of Ornithology, v. 118, no. 4, p. 485-493, https://doi.org/10.1676/05-084.1.","startPage":"485","endPage":"493","numberOfPages":"9","costCenters":[],"links":[{"id":477411,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://www.biodiversitylibrary.org/part/240823","text":"External Repository"},{"id":210001,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1676/05-084.1"},{"id":236787,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"118","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a071ae4b0c8380cd51566","contributors":{"authors":[{"text":"McGowan, C.P.","contributorId":19760,"corporation":false,"usgs":true,"family":"McGowan","given":"C.P.","email":"","affiliations":[],"preferred":false,"id":419807,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Simons, T.R.","contributorId":56334,"corporation":false,"usgs":true,"family":"Simons","given":"T.R.","email":"","affiliations":[],"preferred":false,"id":419808,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70028317,"text":"70028317 - 2006 - Seasonal migration and environmental conditions of Pacific halibut Hippoglossus stenolepis, elucidated from pop-up archival transmitting (PAT) tags","interactions":[],"lastModifiedDate":"2017-06-07T15:51:12","indexId":"70028317","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2663,"text":"Marine Ecology Progress Series","active":true,"publicationSubtype":{"id":10}},"title":"Seasonal migration and environmental conditions of Pacific halibut Hippoglossus stenolepis, elucidated from pop-up archival transmitting (PAT) tags","docAbstract":"

Pop-up archival transmitting (PAT) tags were used to study the fall migration of halibut in the Gulf of Alaska (GOA). We tagged 6 Pacific halibut Hippoglossus stenolepis on summer feeding grounds in the eastern GOA and another 6 in the western GOA from June 13 to August 6, 2002. The tags were programed to be released from the fish on January 15, 2003, at the height of the winter spawning season: 10 tags successfully detached, transmitted archived environmental data (depth and temperature), and generated accurate latitude–longitude coordinates shortly after pop-up; 2 tags deployed off SE Alaska were lost. The tags revealed that 6 fish had moved a considerable distance (>200 km) between tagging and pop-up, and all of these had moved northward to some extent. The longest of the observed migrations was from the southern Alaska Peninsula to Yakutat Bay, a linear displacement of 1153 km; 4 fish showed little evidence of geographic displacement, exhibiting migrations that ranged only from 30 to 69 km. Although 2 fish had moved inshore by the end of the tagging period, all other fish had moved offshore regardless of their overall migration distance. The precise timing of offshore movements varied, beginning as early as August and as late as January. These observations generally corroborate conventional tagging, indicating migration of halibut toward winter spawning grounds in the northern GOA, and movement of fish to deep water in fall. However, no single stereotypic migration behavior was apparent, and a variety of vertical movement patterns and temperature profiles were observed. Halibut spent most time in waters of 5 to 7°C, but experienced temperatures ranging from 2.6 to 11.6°C. Depth observations ranged from 0 to 736 m, with summertime activity concentrated in depths from 0 to 400 m, and halibut that exhibited offshore movement were typically observed at 300 to 700 m by mid-winter. Vertical movement (short-period changes in depth) varied among fish and over time, with some fish displaying little vertical activity, others displaying short periods of activity, and still others displaying considerable activity throughout their time at liberty.

","language":"English","publisher":"Inter Research","doi":"10.3354/meps317259","issn":"01718630","usgsCitation":"Loher, T., and Seitz, A.C., 2006, Seasonal migration and environmental conditions of Pacific halibut Hippoglossus stenolepis, elucidated from pop-up archival transmitting (PAT) tags: Marine Ecology Progress Series, v. 317, p. 259-271, https://doi.org/10.3354/meps317259.","productDescription":"13 p.","startPage":"259","endPage":"271","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":477495,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.3354/meps317259","text":"Publisher Index Page"},{"id":236887,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"317","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b88b7e4b08c986b316b13","contributors":{"authors":[{"text":"Loher, Timothy","contributorId":26130,"corporation":false,"usgs":false,"family":"Loher","given":"Timothy","email":"","affiliations":[{"id":33614,"text":"International Pacific Halibut Comission","active":true,"usgs":false}],"preferred":false,"id":417510,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Seitz, Andrew C.","contributorId":156324,"corporation":false,"usgs":true,"family":"Seitz","given":"Andrew","email":"","middleInitial":"C.","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":6752,"text":"University of Alaska Fairbanks","active":true,"usgs":false}],"preferred":false,"id":417511,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":79482,"text":"ofr20061267 - 2006 - 2005 annual progress report: Elk and bison grazing ecology in the Great Sand Dunes complex of lands","interactions":[],"lastModifiedDate":"2016-04-25T14:15:45","indexId":"ofr20061267","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","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":"2006-1267","title":"2005 annual progress report: Elk and bison grazing ecology in the Great Sand Dunes complex of lands","docAbstract":"

In 2000 the U.S. Congress authorized the expansion of the former Great Sand Dunes National Monument by establishing a new Great Sand Dunes National Park and Preserve in its place, and establishing the Baca National Wildlife Refuge. The establishment of Great Sand Dunes National Park and Preserve and the new Baca National Wildlife Refuge in the San Luis Valley (SLV), Colorado was one of the most significant land conservation actions in the western U.S. in recent years. The action was a result of cooperation between the National Park Service (NPS), U.S. Fish and Wildlife Service (USFWS), Bureau of Land Management (BLM), U.S. Forest Service (USDA-FS), and The Nature Conservancy (TNC). The new national park, when fully implemented, will consist of 107,265 acres, the new national preserve 41,872 acres, and the new national wildlife refuge (USFWS lands) 92,180 acres (fig. 1). The area encompassed by this designation protects a number of natural wonders and features including a unique ecosystem of natural sand dunes, the entire watershed of surface and groundwaters that are necessary to preserve and recharge the dunes and adjacent wetlands, a unique stunted forest, and other valuable riparian vegetation communities that support a host of associated wildlife and bird species.

\n

When the National Park was initially established, there were concerns about overconcentrations and impacts on native plant communities of the unhunted segments of a large and possibly growing elk (Cervus elaphus) population. This led to the designation of the Preserve as a compromise solution, where the elk could be harvested. The Preserve Unit, however, will not address all the ungulate management challenges. In order to reduce the current elk population, harvests of elk may need to be aggressive. But aggressive special hunts of elk to achieve population reductions can result in elk avoidance of certain areas or elk seeking refuge in areas where they cannot be hunted, while removals of whole herd segments and abandonment or alterations of migration routes can occur (Smith and Robbins, 1994; Boyce and others, 1991). Elk may seek refuge from hunting in the newly expanded Park Unit and TNC lands where they might overconcentrate and impact unique vegetation communities. In these sites of refugia, or preferred loafing sites, elk and bison could accelerate a decline in woody riparian shrubs and trees. This decline may also be due to changes in hydrology, climatic, or dunal processes, but ungulate herbivory might exacerbate the effects of those processes.

\n

To address the questions and needs of local resource managers, a multi-agency research project was initiated in 2005 to study the ecology, forage relations, and habitat relations of elk and bison in the Great Sand Dunes–Sangre de Cristo–Baca complex of lands. Meetings and discussions of what this research should include were started in 2001 with representatives from NPS, USFWS, TNC, the Colorado Division of Wildlife (CDOW), and USDA-FS/BLM. The final study plan was successfully funded in 2004 with research scheduled to start in 2005. The research was designed to encompass three major study elements: (1) animal movements and population dynamics, (2) vegetation and nutrient effects from ungulate herbivory, and (3) development of ecological models, using empirical data collected from the first two components, that will include estimates of elk carrying capacity and management scenarios for resource managers.

","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20061267","usgsCitation":"Schoenecker, K.A., Lubow, B., Zeigenfuss, L., and Mao, J., 2006, 2005 annual progress report: Elk and bison grazing ecology in the Great Sand Dunes complex of lands: U.S. Geological Survey Open-File Report 2006-1267, viii, 45 p., https://doi.org/10.3133/ofr20061267.","productDescription":"viii, 45 p.","numberOfPages":"53","onlineOnly":"Y","additionalOnlineFiles":"N","costCenters":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"links":[{"id":190612,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr20061267.PNG"},{"id":320220,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2006/1267/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Colorado","otherGeospatial":"Baca National Wildlife Refuge, Great Sand Dunes National Park and Preserve, San Luis Valley","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -105.86975097656249,\n 37.54893261064109\n ],\n [\n -105.86975097656249,\n 37.913867495923746\n ],\n [\n -105.49072265625,\n 37.913867495923746\n ],\n [\n -105.49072265625,\n 37.54893261064109\n ],\n [\n -105.86975097656249,\n 37.54893261064109\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"53cd491fe4b0b290850eee8b","contributors":{"authors":[{"text":"Schoenecker, Kate A.","contributorId":64343,"corporation":false,"usgs":true,"family":"Schoenecker","given":"Kate","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":290017,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lubow, Bruce C.","contributorId":59520,"corporation":false,"usgs":true,"family":"Lubow","given":"Bruce C.","affiliations":[],"preferred":false,"id":290016,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Zeigenfuss, Linda 0000-0002-6700-8563 linda_zeigenfuss@usgs.gov","orcid":"https://orcid.org/0000-0002-6700-8563","contributorId":2079,"corporation":false,"usgs":true,"family":"Zeigenfuss","given":"Linda","email":"linda_zeigenfuss@usgs.gov","affiliations":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"preferred":true,"id":290015,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Mao, Julie","contributorId":74460,"corporation":false,"usgs":true,"family":"Mao","given":"Julie","email":"","affiliations":[],"preferred":false,"id":290018,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70033346,"text":"70033346 - 2006 - Sediment and nutrient accumulation within lowland bottomland ecosystems: An example from the Atchafalaya River Basin, Louisiana","interactions":[],"lastModifiedDate":"2012-03-12T17:21:36","indexId":"70033346","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Sediment and nutrient accumulation within lowland bottomland ecosystems: An example from the Atchafalaya River Basin, Louisiana","docAbstract":"Sediment and nutrient deposition, storage, and transformations are important environmental functions of riverine forested wetland ecosystems, yet documentation and interpretation of sedimentation/nutrient processes remain incomplete. Our studies located in the Coastal Plain of southeastern USA, including the Atchafalaya Basin, La. (a distributary of the Mississippi River) serve as example for detailed discussion of sediment and nutrient accumulation in lowland systems. The Atchafalaya Basin is the largest contiguously forested riparian wetland in North America and is incurring high sediment loads and hypoxic zones in backswamp settings. We established several floodplain transects, located to reflect major depositional environments within the Basin, to monitor general and local sediment deposition patterns over a multi-year period. Deposition rate and loss on ignition (LOI) data were collected above artificial markers (clay pads) at multiple stations along each transect. Mean floodplain sedimentation rates ranged from about 2 to 42 mm/yr and mean percent organic material ranged from about 7 to 28 percent. The transects were categorized into statistically different deposition groups based on sedimentation rate; most of these groups could be coherently interpreted based on a suite of parameters that includes hydroperiod (elevation), source(s) of sediment-laden water, hydraulic connectivity, flow stagnation, and location in transect (levee versus backswamp). Low elevatic (long hydroperiod), high hydraulic connectivity to multiple sources of sediment-laden water, and hydraulic damming (flow stagnation) lead to the highest amounts of sediment trapping; the converse in any of these factors may diminish sediment trapping. Based on aerial extent of deposition groups, the study area (about 500 km 2) potentially traps 6.72+109 kg of sediment, annually, of which 12 percent or 8.20.108 kg are organic material. This accumulated sediment contains a coarsely estimated 5% and 27% of the annual nitrogen and phosphorus loads to the Atchafalaya Basin, respectively, and 3.7+108 kg C. Thus, the Atchafalaya Basin plays an important role in sediment storage, including the sequestration of carbon, nitrogen, and phosphorus.","largerWorkTitle":"Hydrology and Management of Forested Wetlands - Proceeding of the International Conference","conferenceTitle":"International Conference on Hydrology and Management of Forested Wetlands","conferenceDate":"8 April 2006 through 12 April 2006","conferenceLocation":"New Bern, NC","language":"English","isbn":"1892769530; 9781892769534","usgsCitation":"Hupp, C., and Noe, G., 2006, Sediment and nutrient accumulation within lowland bottomland ecosystems: An example from the Atchafalaya River Basin, Louisiana, in Hydrology and Management of Forested Wetlands - Proceeding of the International Conference, New Bern, NC, 8 April 2006 through 12 April 2006, p. 175-187.","startPage":"175","endPage":"187","numberOfPages":"13","costCenters":[],"links":[{"id":240967,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b8954e4b08c986b316da1","contributors":{"authors":[{"text":"Hupp, C.R. 0000-0003-1853-9197","orcid":"https://orcid.org/0000-0003-1853-9197","contributorId":78775,"corporation":false,"usgs":true,"family":"Hupp","given":"C.R.","affiliations":[],"preferred":false,"id":440441,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Noe, G.B.","contributorId":66464,"corporation":false,"usgs":true,"family":"Noe","given":"G.B.","email":"","affiliations":[],"preferred":false,"id":440440,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70028671,"text":"70028671 - 2006 - Earthquake ground-motion prediction equations for eastern North America","interactions":[],"lastModifiedDate":"2012-03-12T17:21:00","indexId":"70028671","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1135,"text":"Bulletin of the Seismological Society of America","onlineIssn":"1943-3573","printIssn":"0037-1106","active":true,"publicationSubtype":{"id":10}},"title":"Earthquake ground-motion prediction equations for eastern North America","docAbstract":"New earthquake ground-motion relations for hard-rock and soil sites in eastern North America (ENA), including estimates of their aleatory uncertainty (variability) have been developed based on a stochastic finite-fault model. The model incorporates new information obtained from ENA seismographic data gathered over the past 10 years, including three-component broadband data that provide new information on ENA source and path effects. Our new prediction equations are similar to the previous ground-motion prediction equations of Atkinson and Boore (1995), which were based on a stochastic point-source model. The main difference is that high-frequency amplitudes (f ??? 5 Hz) are less than previously predicted (by about a factor of 1.6 within 100 km), because of a slightly lower average stress parameter (140 bars versus 180 bars) and a steeper near-source attenuation. At frequencies less than 5 Hz, the predicted ground motions from the new equations are generally within 25% of those predicted by Atkinson and Boore (1995). The prediction equations agree well with available ENA ground-motion data as evidenced by near-zero average residuals (within a factor of 1.2) for all frequencies, and the lack of any significant residual trends with distance. However, there is a tendency to positive residuals for moderate events at high frequencies in the distance range from 30 to 100 km (by as much as a factor of 2). This indicates epistemic uncertainty in the prediction model. The positive residuals for moderate events at < 100 km could be eliminated by an increased stress parameter, at the cost of producing negative residuals in other magnitude-distance ranges; adjustment factors to the equations are provided that may be used to model this effect.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Bulletin of the Seismological Society of America","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1785/0120050245","issn":"00371106","usgsCitation":"Atkinson, G.M., and Boore, D., 2006, Earthquake ground-motion prediction equations for eastern North America: Bulletin of the Seismological Society of America, v. 96, no. 6, p. 2181-2205, https://doi.org/10.1785/0120050245.","startPage":"2181","endPage":"2205","numberOfPages":"25","costCenters":[],"links":[{"id":209793,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1785/0120050245"},{"id":236508,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"96","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a04eee4b0c8380cd50b99","contributors":{"authors":[{"text":"Atkinson, G. M.","contributorId":69283,"corporation":false,"usgs":true,"family":"Atkinson","given":"G.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":419168,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Boore, D.M. 0000-0002-8605-9673","orcid":"https://orcid.org/0000-0002-8605-9673","contributorId":64226,"corporation":false,"usgs":true,"family":"Boore","given":"D.M.","affiliations":[],"preferred":false,"id":419167,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70028177,"text":"70028177 - 2006 - A reexamination of age-related variation in body weight and morphometry of Maryland nutria","interactions":[],"lastModifiedDate":"2012-03-12T17:20:43","indexId":"70028177","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2508,"text":"Journal of Wildlife Management","active":true,"publicationSubtype":{"id":10}},"title":"A reexamination of age-related variation in body weight and morphometry of Maryland nutria","docAbstract":"Age-related variation in morphometry has been documented for many species. Knowledge of growth patterns can be useful for modeling energetics, detecting physiological influences on populations, and predicting age. These benefits have shown value in understanding population dynamics of invasive species, particularly in developing efficient control and eradication programs. However, development and evaluation of descriptive and predictive models is a critical initial step in this process. Accordingly, we used data from necropsies of 1,544 nutria (Myocastor coypus) collected in Maryland, USA, to evaluate the accuracy of previously published models for prediction of nutria age from body weight. Published models underestimated body weights of our animals, especially for ages <3. We used cross-validation procedures to develop and evaluate models for describing nutria growth patterns and for predicting nutria age. We derived models from a randomly selected model-building data set (n = 192-193 M, 217-222 F) and evaluated them with the remaining animals (n = 487-488 M, 642-647 F). We used nonlinear regression to develop Gompertz growth-curve models relating morphometric variables to age. Predicted values of morphometric variables fell within the 95% confidence limits of their true values for most age classes. We also developed predictive models for estimating nutria age from morphometry, using linear regression of log-transformed age on morphometric variables. The evaluation data set corresponded with 95% prediction intervals from the new models. Predictive models for body weight and length provided greater accuracy and less bias than models for foot length and axillary girth. Our growth models accurately described age-related variation in nutria morphometry, and our predictive models provided accurate estimates of ages from morphometry that will be useful for live-captured individuals. Our models offer better accuracy and precision than previously published models, providing a capacity for modeling energetics and growth patterns of Maryland nutria as well as an empirical basis for determining population age structure from live-captured animals.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Wildlife Management","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.2193/0022-541X(2006)70[1132:AROAVI]2.0.CO;2","issn":"0022541X","usgsCitation":"Sherfy, M., Mollett, T., McGowan, K., and Daugherty, S., 2006, A reexamination of age-related variation in body weight and morphometry of Maryland nutria: Journal of Wildlife Management, v. 70, no. 4, p. 1132-1141, https://doi.org/10.2193/0022-541X(2006)70[1132:AROAVI]2.0.CO;2.","startPage":"1132","endPage":"1141","numberOfPages":"10","costCenters":[],"links":[{"id":210020,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.2193/0022-541X(2006)70[1132:AROAVI]2.0.CO;2"},{"id":236810,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"70","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e53fe4b0c8380cd46c29","contributors":{"authors":[{"text":"Sherfy, M. H. 0000-0003-3016-4105","orcid":"https://orcid.org/0000-0003-3016-4105","contributorId":42561,"corporation":false,"usgs":true,"family":"Sherfy","given":"M. H.","affiliations":[],"preferred":false,"id":416924,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Mollett, T.A.","contributorId":91290,"corporation":false,"usgs":true,"family":"Mollett","given":"T.A.","affiliations":[],"preferred":false,"id":416926,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"McGowan, K.R.","contributorId":90524,"corporation":false,"usgs":true,"family":"McGowan","given":"K.R.","email":"","affiliations":[],"preferred":false,"id":416925,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Daugherty, S.L.","contributorId":10980,"corporation":false,"usgs":true,"family":"Daugherty","given":"S.L.","email":"","affiliations":[],"preferred":false,"id":416923,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70028967,"text":"70028967 - 2006 - Prediction of broadband ground-motion time histories: Hybrid low/high-frequency method with correlated random source parameters","interactions":[],"lastModifiedDate":"2016-01-27T14:01:18","indexId":"70028967","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1135,"text":"Bulletin of the Seismological Society of America","onlineIssn":"1943-3573","printIssn":"0037-1106","active":true,"publicationSubtype":{"id":10}},"title":"Prediction of broadband ground-motion time histories: Hybrid low/high-frequency method with correlated random source parameters","docAbstract":"

We present a new method for calculating broadband time histories of ground motion based on a hybrid low-frequency/high-frequency approach with correlated source parameters. Using a finite-difference method we calculate low- frequency synthetics (< ∼1 Hz) in a 3D velocity structure. We also compute broadband synthetics in a 1D velocity model using a frequency-wavenumber method. The low frequencies from the 3D calculation are combined with the high frequencies from the 1D calculation by using matched filtering at a crossover frequency of 1 Hz. The source description, common to both the 1D and 3D synthetics, is based on correlated random distributions for the slip amplitude, rupture velocity, and rise time on the fault. This source description allows for the specification of source parameters independent of any a priori inversion results. In our broadband modeling we include correlation between slip amplitude, rupture velocity, and rise time, as suggested by dynamic fault modeling. The method of using correlated random source parameters is flexible and can be easily modified to adjust to our changing understanding of earthquake ruptures. A realistic attenuation model is common to both the 3D and 1D calculations that form the low- and high-frequency components of the broadband synthetics. The value of Q is a function of the local shear-wave velocity. To produce more accurate high-frequency amplitudes and durations, the 1D synthetics are corrected with a randomized, frequency-dependent radiation pattern. The 1D synthetics are further corrected for local site and nonlinear soil effects by using a 1D nonlinear propagation code and generic velocity structure appropriate for the site’s National Earthquake Hazards Reduction Program (NEHRP) site classification. The entire procedure is validated by comparison with the 1994 Northridge, California, strong ground motion data set. The bias and error found here for response spectral acceleration are similar to the best results that have been published by others for the Northridge rupture.

","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Bulletin of the Seismological Society of America","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Seismomological Society of America","publisherLocation":"Stanford","doi":"10.1785/0120060036","issn":"00371106","usgsCitation":"Liu, P., Archuleta, R., and Hartzell, S., 2006, Prediction of broadband ground-motion time histories: Hybrid low/high-frequency method with correlated random source parameters: Bulletin of the Seismological Society of America, v. 96, no. 6, p. 2118-2130, https://doi.org/10.1785/0120060036.","productDescription":"13 p.","startPage":"2118","endPage":"2130","numberOfPages":"13","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":236526,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":209806,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1785/0120060036"}],"volume":"96","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a81eae4b0c8380cd7b7cb","contributors":{"authors":[{"text":"Liu, P.","contributorId":98443,"corporation":false,"usgs":true,"family":"Liu","given":"P.","email":"","affiliations":[],"preferred":false,"id":420771,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Archuleta, R.J.","contributorId":79245,"corporation":false,"usgs":true,"family":"Archuleta","given":"R.J.","affiliations":[],"preferred":false,"id":420770,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hartzell, S.H.","contributorId":27426,"corporation":false,"usgs":true,"family":"Hartzell","given":"S.H.","email":"","affiliations":[],"preferred":false,"id":420769,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70031193,"text":"70031193 - 2006 - Foraging destinations and marine habitat use of short-tailed albatrosses: A multi-scale approach using first-passage time analysis","interactions":[],"lastModifiedDate":"2012-03-12T17:21:17","indexId":"70031193","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1371,"text":"Deep-Sea Research Part II: Topical Studies in Oceanography","active":true,"publicationSubtype":{"id":10}},"title":"Foraging destinations and marine habitat use of short-tailed albatrosses: A multi-scale approach using first-passage time analysis","docAbstract":"We used satellite telemetry, remotely sensed data (bathymetry, chlorophyll a (chl a), sea-surface temperature (SST), wind speed) and first-passage time (FPT) analysis to determine the distribution, movement patterns, and habitat associations of short-tailed albatrosses (Phoebastria albatrus) during the non-breeding season, 2002 and 2003. Satellite transmitters were deployed on birds immediately prior to their departure from a breeding colony at Torishima, Japan (n = 11), or at-sea in the Aleutian Islands (n = 3). Tracking durations ranged from 51 to 138 days for a total of 6709 locations after filtering (131 - 808 per bird). FPT (time required to transit a circle of given radius) revealed the location and spatial scale of area-restricted search (ARS) patterns along flight paths. On average, ARS occurred within 70 km radii. Consequently, the fit of the habitat use models increased at spatial scales beyond a 40 km FPT radius (R2 = 0.31) and stabilized for scales of 70 km and larger (R2=0.40- 0.51). At all scales, wind speed, depth or depth gradient, and chl a or chl a gradient had a significant effect on FPT (i.e., residence time). FPT increased within regions of higher gradients of depth and chl a. In contrast, FPT decreased within regions of greater depth and wind speed, with a significant interaction of wind speed and depth at some scales. Sea-surface temperature or its interactions were only significant at large spatial scales (???160 km FPT radius). Albatrosses engaged in ARS activities primarily over the shelf break and slope, including Kuroshio and Oyashio regions off the western subarctic gyre. Occasionally, birds transited the northern boundary of the Kuroshio Extension while in-route to the Aleutian Islands and Bering Sea, but overall spent little time in the western gyre. In the Aleutian Islands, ARS occurred within straits, particularly along the central and western part of the archipelago. In the Bering Sea, ARS occurred along the northern continental shelf break, the Kamchatka Current region, and east of the Commander Islands. Non-breeding short-tailed albatross concentrate foraging in oceanic areas characterized by gradients in topography and water column productivity. This study provides an understanding of the foraging ecology for a highly migratory, imperiled seabird, and confirms the importance of shelf break and slope regions as hot spots for a variety of top marine predators in the North Pacific.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Deep-Sea Research Part II: Topical Studies in Oceanography","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.dsr2.2006.01.012","issn":"09670645","usgsCitation":"Suryan, R., Sato, F., Balogh, G., David, H., Sievert, P., and Ozaki, K., 2006, Foraging destinations and marine habitat use of short-tailed albatrosses: A multi-scale approach using first-passage time analysis: Deep-Sea Research Part II: Topical Studies in Oceanography, v. 53, no. 3-4, p. 370-386, https://doi.org/10.1016/j.dsr2.2006.01.012.","startPage":"370","endPage":"386","numberOfPages":"17","costCenters":[],"links":[{"id":211550,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.dsr2.2006.01.012"},{"id":238852,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"53","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a12f7e4b0c8380cd54482","contributors":{"authors":[{"text":"Suryan, R.M.","contributorId":52919,"corporation":false,"usgs":true,"family":"Suryan","given":"R.M.","email":"","affiliations":[],"preferred":false,"id":430454,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Sato, F.","contributorId":34718,"corporation":false,"usgs":true,"family":"Sato","given":"F.","email":"","affiliations":[],"preferred":false,"id":430452,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Balogh, G.R.","contributorId":74349,"corporation":false,"usgs":true,"family":"Balogh","given":"G.R.","email":"","affiliations":[],"preferred":false,"id":430455,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"David, Hyrenbach K.","contributorId":38358,"corporation":false,"usgs":true,"family":"David","given":"Hyrenbach K.","affiliations":[],"preferred":false,"id":430453,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Sievert, P.R.","contributorId":104858,"corporation":false,"usgs":true,"family":"Sievert","given":"P.R.","email":"","affiliations":[],"preferred":false,"id":430457,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Ozaki, K.","contributorId":103470,"corporation":false,"usgs":true,"family":"Ozaki","given":"K.","email":"","affiliations":[],"preferred":false,"id":430456,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70030277,"text":"70030277 - 2006 - Estimation of temporary emigration in male toads","interactions":[],"lastModifiedDate":"2015-12-14T14:39:10","indexId":"70030277","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1465,"text":"Ecology","active":true,"publicationSubtype":{"id":10}},"title":"Estimation of temporary emigration in male toads","docAbstract":"

Male boreal toads (Bufo boreas) are thought to return to the breeding site every year but, if absent in a particular year, will be more likely to return the following year. Using Pollock's robust design we estimated temporary emigration (the probability a male toad is absent from a breeding site in a given year) at three locations in Colorado, USA: two in Rocky Mountain National Park and one in Chaffee County. We present data that suggest that not all male toads return to the breeding site every year. Our analyses indicate that temporary emigration varies by site and time (for example, from 1992 to 1998, the probability of temporary emigration ranged from 10% to 29% and from 3% to 95% at Lost Lake and Kettle Tarn, respectively). Although the results provide weak evidence that males are more likely to return after a year's hiatus, a general pattern of state-dependent temporary emigration was not supported. We also hypothesized relationships between temporary emigration and a number of weather variables. While some competitive models included weather covariates, imprecise and variable estimates of the effects of these covariates precluded fully defining their impact on temporary emigration. ?? 2006 by the Ecological Society of America.

","language":"English","publisher":"Ecological Society of America","doi":"10.1890/0012-9658(2006)87[1048:EOTEIM]2.0.CO;2","issn":"00129658","usgsCitation":"Muths, E., Scherer, R.D., Corn, P., and Lambert, B., 2006, Estimation of temporary emigration in male toads: Ecology, v. 87, no. 4, p. 1048-1056, https://doi.org/10.1890/0012-9658(2006)87[1048:EOTEIM]2.0.CO;2.","productDescription":"9 p.","startPage":"1048","endPage":"1056","numberOfPages":"9","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":481,"text":"Northern Rocky Mountain Science Center","active":true,"usgs":true}],"links":[{"id":239195,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Colorado","county":"Chaffee County","otherGeospatial":"Rocky Mountain National Park","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -109.05029296875,\n 37.03763967977139\n ],\n [\n -109.05029296875,\n 41.0130657870063\n ],\n [\n -101.9970703125,\n 41.0130657870063\n ],\n [\n -101.9970703125,\n 37.03763967977139\n ],\n [\n -109.05029296875,\n 37.03763967977139\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"87","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0bb4e4b0c8380cd52833","contributors":{"authors":[{"text":"Muths, E.","contributorId":6394,"corporation":false,"usgs":true,"family":"Muths","given":"E.","affiliations":[],"preferred":false,"id":426438,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Scherer, R. D.","contributorId":8061,"corporation":false,"usgs":false,"family":"Scherer","given":"R.","email":"","middleInitial":"D.","affiliations":[{"id":6674,"text":"Department of Integrative Biology, University of Colorado Denver","active":true,"usgs":false}],"preferred":false,"id":426439,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Corn, P.S.","contributorId":63751,"corporation":false,"usgs":true,"family":"Corn","given":"P.S.","affiliations":[],"preferred":false,"id":426441,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Lambert, B.A.","contributorId":58378,"corporation":false,"usgs":true,"family":"Lambert","given":"B.A.","email":"","affiliations":[],"preferred":false,"id":426440,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70030345,"text":"70030345 - 2006 - A Bayesian random effects discrete-choice model for resource selection: Population-level selection inference","interactions":[],"lastModifiedDate":"2012-03-12T17:21:03","indexId":"70030345","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2508,"text":"Journal of Wildlife Management","active":true,"publicationSubtype":{"id":10}},"title":"A Bayesian random effects discrete-choice model for resource selection: Population-level selection inference","docAbstract":"Modeling the probability of use of land units characterized by discrete and continuous measures, we present a Bayesian random-effects model to assess resource selection. This model provides simultaneous estimation of both individual- and population-level selection. Deviance information criterion (DIC), a Bayesian alternative to AIC that is sample-size specific, is used for model selection. Aerial radiolocation data from 76 adult female caribou (Rangifer tarandus) and calf pairs during 1 year on an Arctic coastal plain calving ground were used to illustrate models and assess population-level selection of landscape attributes, as well as individual heterogeneity of selection. Landscape attributes included elevation, NDVI (a measure of forage greenness), and land cover-type classification. Results from the first of a 2-stage model-selection procedure indicated that there is substantial heterogeneity among cow-calf pairs with respect to selection of the landscape attributes. In the second stage, selection of models with heterogeneity included indicated that at the population-level, NDVI and land cover class were significant attributes for selection of different landscapes by pairs on the calving ground. Population-level selection coefficients indicate that the pairs generally select landscapes with higher levels of NDVI, but the relationship is quadratic. The highest rate of selection occurs at values of NDVI less than the maximum observed. Results for land cover-class selections coefficients indicate that wet sedge, moist sedge, herbaceous tussock tundra, and shrub tussock tundra are selected at approximately the same rate, while alpine and sparsely vegetated landscapes are selected at a lower rate. Furthermore, the variability in selection by individual caribou for moist sedge and sparsely vegetated landscapes is large relative to the variability in selection of other land cover types. The example analysis illustrates that, while sometimes computationally intense, a Bayesian hierarchical discrete-choice model for resource selection can provide managers with 2 components of population-level inference: average population selection and variability of selection. Both components are necessary to make sound management decisions based on animal selection.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Wildlife Management","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.2193/0022-541X(2006)70[404:ABREDM]2.0.CO;2","issn":"0022541X","usgsCitation":"Thomas, D., Johnson, D., and Griffith, B., 2006, A Bayesian random effects discrete-choice model for resource selection: Population-level selection inference: Journal of Wildlife Management, v. 70, no. 2, p. 404-412, https://doi.org/10.2193/0022-541X(2006)70[404:ABREDM]2.0.CO;2.","startPage":"404","endPage":"412","numberOfPages":"9","costCenters":[],"links":[{"id":239199,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":211829,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.2193/0022-541X(2006)70[404:ABREDM]2.0.CO;2"}],"volume":"70","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e2c9e4b0c8380cd45c51","contributors":{"authors":[{"text":"Thomas, D.L.","contributorId":51481,"corporation":false,"usgs":true,"family":"Thomas","given":"D.L.","email":"","affiliations":[],"preferred":false,"id":426779,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Johnson, D.","contributorId":85955,"corporation":false,"usgs":true,"family":"Johnson","given":"D.","email":"","affiliations":[],"preferred":false,"id":426780,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Griffith, B.","contributorId":25905,"corporation":false,"usgs":true,"family":"Griffith","given":"B.","email":"","affiliations":[],"preferred":false,"id":426778,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70028665,"text":"70028665 - 2006 - Location and timing of river-aquifer exchanges in six tributaries to the Columbia River in the Pacific Northwest of the United States","interactions":[],"lastModifiedDate":"2016-05-27T15:16:22","indexId":"70028665","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","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":"Location and timing of river-aquifer exchanges in six tributaries to the Columbia River in the Pacific Northwest of the United States","docAbstract":"

The flow of water between rivers and contiguous aquifers influences the quantity and quality of water resources, particularly in regions where precipitation and runoff are unevenly distributed through the year, such as the Columbia Basin (CB) in northwestern United States. Investigations of basin hydrogeology and gains and losses of streamflow for six rivers in the CB were reviewed to characterize general patterns in the timing and location of river-aquifer exchanges at a reach-scale (0.5-150 km) and to identify geologic and geomorphic features associated with the largest exchanges. Ground-water discharge to each river, or the gain in streamflow, was concentrated spatially: more than one-half of the total gains along each river segment were contributed from reaches that represented no more than 30% of the total segment length with the largest and most concentrated gains in rivers in volcanic terrains. Fluvial recharge of aquifers, or losses of streamflow, was largest in rivers in sedimentary basins where unconsolidated sediments form shallow aquifers. Three types of geologic or geomorphic features were associated with the largest exchanges: (1) changes in the thickness of unconsolidated aquifers; (2) contacts between lithologic units that represent contrasts in permeability; and (3) channel forms that increase the hydraulic gradient or cross-sectional area of flow paths between a river and shallow ground-water. The down-valley component of ground-water flow and its vertical convergence on or divergence from a riverbed account for large streamflow gains in some reaches and contrast with the common assumption of lateral ground-water discharge to a river that penetrates completely through the aquifer. Increased ground-water discharge was observed during high-flow periods in reaches of four rivers indicating that changes in ground-water levels can be more important than stage fluctuations in regulating the direction and magnitude of river-aquifer exchanges and that assumptions about ground-water discharge during high flow periods used for base-flow separation must be verified. Given the variety of geologic terrains in the CB, the spatial and temporal patterns of river-aquifer exchanges provide a framework for investigations in other regions that includes a focus on reaches where the largest exchanges are likely to occur, integration of ground-water and surface-water data, and verification of assumptions regarding ground-water flow direction and temporal variation of exchanges. ?? 2006 Elsevier B.V. All rights reserved.

","language":"English","publisher":"Elsevier","doi":"10.1016/j.jhydrol.2006.02.028","issn":"00221694","usgsCitation":"Konrad, C., 2006, Location and timing of river-aquifer exchanges in six tributaries to the Columbia River in the Pacific Northwest of the United States: Journal of Hydrology, v. 329, no. 3-4, p. 444-470, https://doi.org/10.1016/j.jhydrol.2006.02.028.","productDescription":"27 p.","startPage":"444","endPage":"470","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":622,"text":"Washington Water Science Center","active":true,"usgs":true}],"links":[{"id":236433,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":209736,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jhydrol.2006.02.028"}],"volume":"329","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a490be4b0c8380cd68305","contributors":{"authors":[{"text":"Konrad, C.P.","contributorId":39027,"corporation":false,"usgs":true,"family":"Konrad","given":"C.P.","email":"","affiliations":[],"preferred":false,"id":419121,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70028262,"text":"70028262 - 2006 - The chemical quality of self-supplied domestic well water in the United States","interactions":[],"lastModifiedDate":"2018-10-29T10:16:21","indexId":"70028262","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1864,"text":"Ground Water Monitoring and Remediation","active":true,"publicationSubtype":{"id":10}},"title":"The chemical quality of self-supplied domestic well water in the United States","docAbstract":"

Existing water quality data collected from domestic wells were summarized to develop the first national‐scale retrospective of self‐supplied drinking water sources. The contaminants evaluated represent a range of inorganic and organic compounds, and although the data set was not originally designed to be a statistical representation of national occurrence, it encompasses large parts of the United States including at least some wells sampled in every state and Puerto Rico. Inorganic contaminants were detected in many of the wells, and concentrations exceeded the U.S. EPA maximum contaminant levels (MCLs; federal drinking water standards used to regulate public drinking water quality) more often than organic contaminants. Of the inorganic constituents evaluated, arsenic concentrations exceeded the MCL (10 μg/L) in ∼11% of the 7580 wells evaluated, nitrate exceeded the MCL (10 mg/L) in ∼8% of the 3465 wells evaluated, uranium‐238 exceeded the MCL (30 μg/L) in ∼4% of the wells, and radon‐222 exceeded 300 and 4000 pCi/L (potential drinking water standards currently under review by the U.S. EPA) in ∼75% and 9% of the wells, respectively. The MCLs for total mercury and fluoride were each exceeded in <1% of the wells evaluated. The MCL was exceeded in <1% of all wells for all anthropogenically derived organic contaminants evaluated and was not exceeded for many contaminants. In addition, 10 contaminants evaluated do not currently have an MCL. Atrazine, however, was detected in 24% of the wells evaluated and was the most frequently detected organic contaminant of the 28 organic contaminants evaluated in this study. Simazine and metolachlor each were detected in ∼9% of all wells and tied for second in frequency of detection for organic contaminants. The third and fourth most frequently detected organic contaminants were methyl tert‐butyl ether (MTBE) (6%) and chloroform (5%), respectively. Because the water quality of domestic wells is not federally regulated or nationally monitored, this study provides a unique, previously nonexistent, perspective on the quality of the self‐supplied drinking water resources used by ∼45 million Americans in the United States.

","language":"English","publisher":"Wiley","doi":"10.1111/j.1745-6592.2006.00089.x","issn":"10693629","usgsCitation":"Focazio, M.J., Tipton, D., Shapiro, S.D., and Geiger, L.H., 2006, The chemical quality of self-supplied domestic well water in the United States: Ground Water Monitoring and Remediation, v. 26, no. 3, p. 92-104, https://doi.org/10.1111/j.1745-6592.2006.00089.x.","productDescription":"13 p.","startPage":"92","endPage":"104","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":210267,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1111/j.1745-6592.2006.00089.x"},{"id":237136,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"26","issue":"3","noUsgsAuthors":false,"publicationDate":"2006-08-11","publicationStatus":"PW","scienceBaseUri":"505baa2ce4b08c986b322744","contributors":{"authors":[{"text":"Focazio, Michael J. 0000-0003-0967-5576 mfocazio@usgs.gov","orcid":"https://orcid.org/0000-0003-0967-5576","contributorId":1276,"corporation":false,"usgs":true,"family":"Focazio","given":"Michael","email":"mfocazio@usgs.gov","middleInitial":"J.","affiliations":[{"id":5056,"text":"Office of the AD Energy and Minerals, and Environmental Health","active":true,"usgs":true},{"id":38175,"text":"Toxics Substances Hydrology Program","active":true,"usgs":true}],"preferred":true,"id":417292,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Tipton, D.","contributorId":58453,"corporation":false,"usgs":true,"family":"Tipton","given":"D.","email":"","affiliations":[],"preferred":false,"id":417291,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Shapiro, Stephanie Dunkle","contributorId":82738,"corporation":false,"usgs":true,"family":"Shapiro","given":"Stephanie","email":"","middleInitial":"Dunkle","affiliations":[],"preferred":false,"id":417294,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Geiger, Linda H.","contributorId":91113,"corporation":false,"usgs":true,"family":"Geiger","given":"Linda","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":417293,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70028662,"text":"70028662 - 2006 - Coulomb stress transfer and tectonic loading preceding the 2002 Denali fault earthquake","interactions":[],"lastModifiedDate":"2017-04-26T14:03:11","indexId":"70028662","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1135,"text":"Bulletin of the Seismological Society of America","onlineIssn":"1943-3573","printIssn":"0037-1106","active":true,"publicationSubtype":{"id":10}},"title":"Coulomb stress transfer and tectonic loading preceding the 2002 Denali fault earthquake","docAbstract":"

Pre-2002 tectonic loading and Coulomb stress transfer are modeled along the rupture zone of the M 7.9 Denali fault earthquake (DFE) and on adjacent segments of the right-lateral Denali–Totschunda fault system in central Alaska, using a three-dimensional boundary-element program. The segments modeled closely follow, for about 95°, the arc of a circle of radius 375 km centered on an inferred asperity near the northeastern end of the intersection of the Patton Bay fault with the Alaskan megathrust under Prince William Sound. The loading model includes slip of 6 mm/yr below 12 km along the fault system, consistent with rotation of the Wrangell block about the asperity at a rate of about 1°/m.y. as well as slip of the Pacific plate at 5 cm/yr at depth along the Fairweather–Queen Charlotte transform fault system and on the Alaska megathrust. The model is consistent with most available pre-2002 Global Positioning System (GPS) displacement rate data. Coulomb stresses induced on the Denali–Totschunda fault system (locked above 12 km) by slip at depth and by transfer from the M 9.2 Prince William Sound earthquake of 1964 dominated the changing Coulomb stress distribution along the fault. The combination of loading (∼70–85%) and coseismic stress transfer from the great 1964 earthquake (∼15–30%) were the principal post-1900 stress factors building toward strike-slip failure of the northern Denali and Totschunda segments in the M 7.9 earthquake of November 2002. Postseismic stresses transferred from the 1964 earthquake may also have been a significant factor. The M 7.2–7.4 Delta River earthquake of 1912 (Carver et al., 2004) may have delayed or advanced the timing of the DFE, depending on the details and location of its rupture. The initial subevent of the 2002 DFE earthquake was on the 40-km Susitna Glacier thrust fault at the western end of the Denali fault rupture. The Coulomb stress transferred from the 1964 earthquake moved the Susitna Glacier thrust fault uniformly away from thrust failure by about 100 kPa. The initiation of the Denali fault earthquake was advanced by transfer of 30–50 kPa of positive Coulomb stress to the Susitna Glacier fault (Anderson and Ji, 2003) by the nearby M 6.7 Nenana Mountain foreshock of 23 October 2002. The regional tectonic loading model used here suggests that the Semidi (Alaska Peninsula) segment of the megathrust that ruptured in 1938 (M 8.2) may be reloaded and approaching failure.

","language":"English","publisher":"Seismological Society of America","doi":"10.1785/0120050007","issn":"00371106","usgsCitation":"Bufe, C.G., 2006, Coulomb stress transfer and tectonic loading preceding the 2002 Denali fault earthquake: Bulletin of the Seismological Society of America, v. 96, no. 5, p. 1662-1674, https://doi.org/10.1785/0120050007.","productDescription":"13","startPage":"1662","endPage":"1674","costCenters":[],"links":[{"id":236368,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"96","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059fc84e4b0c8380cd4e2c5","contributors":{"authors":[{"text":"Bufe, Charles G. cbufe@usgs.gov","contributorId":1621,"corporation":false,"usgs":true,"family":"Bufe","given":"Charles","email":"cbufe@usgs.gov","middleInitial":"G.","affiliations":[],"preferred":true,"id":419114,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70028178,"text":"70028178 - 2006 - Does anthropogenic nitrogen enrichment increase organic nitrogen concentrations in runoff from forested and human-dominated watersheds?","interactions":[],"lastModifiedDate":"2012-03-12T17:20:43","indexId":"70028178","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1478,"text":"Ecosystems","active":true,"publicationSubtype":{"id":10}},"title":"Does anthropogenic nitrogen enrichment increase organic nitrogen concentrations in runoff from forested and human-dominated watersheds?","docAbstract":"Although the effects of anthropogenic nitrogen (N) inputs on the dynamics of inorganic N in watersheds have been studied extensively, \"the influence of N enrichment on organic N loss\" is not as well understood. We compiled and synthesized data on surface water N concentrations from 348 forested and human-dominated watersheds with a range of N loads (from less than 100 to 7,100 kg N km-2 y-1) to evaluate the effects of N loading via atmospheric deposition, fertilization, and wastewater on dissolved organic N (DON) concentrations. Our results indicate that, on average, DON accounts for half of the total dissolved N (TDN) concentrations from forested watersheds, but it accounts for a smaller fraction of TDN in runoff from urban and agricultural watersheds with higher N loading. A significant but weak correlation (r 2 = 0.06) suggests that N loading has little influence on DON concentrations in forested watersheds. This result contrasts with observations from some plot-scale N fertilization studies and suggests that variability in watershed characteristics and climate among forested watersheds may be a more important control on DON losses than N loading from atmospheric sources. Mean DON concentrations were positively correlated, however, with N load across the entire land-use gradient (r 2 = 0.37, P < 0.01), with the highest concentrations found in agricultural and urban watersheds. We hypothesize that both direct contributions of DON from wastewater and agricultural amendments and indirect transformations of inorganic N to organic N represent important sources of DON to surface waters in human-dominated watersheds. We conclude that DON is an important component of N loss in surface waters draining forested and human-dominated watersheds and suggest several research priorities that may be useful in elucidating the role of N enrichment in watershed DON dynamics. ?? 2006 Springer Science+Business Media, Inc.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ecosystems","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10021-006-0076-3","issn":"14329840","usgsCitation":"Pellerin, B., Kaushal, S., and McDowell, W.H., 2006, Does anthropogenic nitrogen enrichment increase organic nitrogen concentrations in runoff from forested and human-dominated watersheds?: Ecosystems, v. 9, no. 5, p. 852-864, https://doi.org/10.1007/s10021-006-0076-3.","startPage":"852","endPage":"864","numberOfPages":"13","costCenters":[],"links":[{"id":210044,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10021-006-0076-3"},{"id":236843,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"9","issue":"5","noUsgsAuthors":false,"publicationDate":"2006-08-08","publicationStatus":"PW","scienceBaseUri":"505a038ae4b0c8380cd50515","contributors":{"authors":[{"text":"Pellerin, B.A.","contributorId":81233,"corporation":false,"usgs":true,"family":"Pellerin","given":"B.A.","email":"","affiliations":[],"preferred":false,"id":416928,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kaushal, S.S.","contributorId":63931,"corporation":false,"usgs":true,"family":"Kaushal","given":"S.S.","email":"","affiliations":[],"preferred":false,"id":416927,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"McDowell, W. H.","contributorId":88532,"corporation":false,"usgs":false,"family":"McDowell","given":"W.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":416929,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70028364,"text":"70028364 - 2006 - Nest survival of clay-colored and vesper sparrows in relation to woodland edge in mixed-grass prairies","interactions":[],"lastModifiedDate":"2017-10-26T11:23:10","indexId":"70028364","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2508,"text":"Journal of Wildlife Management","active":true,"publicationSubtype":{"id":10}},"title":"Nest survival of clay-colored and vesper sparrows in relation to woodland edge in mixed-grass prairies","docAbstract":"The quantity and quality of northern mixed-grass prairie continues to decline because of conversion to agriculture, invasion of woody and exotic plants, and disruption of important ecological processes that shape grasslands. Declines in grassland bird populations in North Dakota, USA, have coincided with these largely anthropogenic alterations to prairie habitat. In grasslands of north-central and northwestern North Dakota, woody plants have increased due primarily to fire suppression, extirpation of bison (Bos bison), and widescale planting of tree shelter belts. In northern grasslands, effects of woody vegetation on survival of grassland birds are poorly understood, and conclusions are based mainly on studies conducted outside the region. We examined nest survival of clay-colored sparrows (Spizella pallida) and vesper sparrows (Pooecetes gramineus) relative to the distance nests were located from aspen (Populus tremuloides,) woodland edges and relative to other habitat features near the nest. Clay-colored and vesper sparrow nest survival was higher for nests located near woodland edges, nests with greater cover of Kentucky bluegrass (Poa pratensis), and nests more concealed by vegetation. Vesper sparrow nest survival increased as the percent cover of tall shrubs near the nest increased. Based on video-camera data, the 13-lined ground squirrel (Spermophilus tridecemlineatus,) was the most common predator of sparrow eggs and young. Thirteen-lined ground squirrels were more common far from woodland edges than near, and this pattern may, in part, explain clay-colored and vesper sparrow nest survival in relation to woodland edges. In contrast to our results, studies conducted in other grassland systems generally report lower nest survival for grassland birds nesting near trees and shrubs. This disparity in results demonstrates the need to identify specific nest predators and their distributions with respect to important habitat features because these data can be important in explaining-and perhaps predicting-patterns of nest predation.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Wildlife Management","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.2193/0022-541X(2006)70[691:NSOCAV]2.0.CO;2","issn":"0022541X","usgsCitation":"Grant, T., Madden, E., Shaffer, T., Pietz, P., Berkey, G., and Kadrmas, N., 2006, Nest survival of clay-colored and vesper sparrows in relation to woodland edge in mixed-grass prairies: Journal of Wildlife Management, v. 70, no. 3, p. 691-701, https://doi.org/10.2193/0022-541X(2006)70[691:NSOCAV]2.0.CO;2.","productDescription":"11 p.","startPage":"691","endPage":"701","costCenters":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":237104,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":210241,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.2193/0022-541X(2006)70[691:NSOCAV]2.0.CO;2"}],"volume":"70","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a64a5e4b0c8380cd72a0d","contributors":{"authors":[{"text":"Grant, T.A.","contributorId":89855,"corporation":false,"usgs":true,"family":"Grant","given":"T.A.","email":"","affiliations":[],"preferred":false,"id":417749,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Madden, E.M.","contributorId":28214,"corporation":false,"usgs":true,"family":"Madden","given":"E.M.","email":"","affiliations":[],"preferred":false,"id":417746,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Shaffer, T.L.","contributorId":98245,"corporation":false,"usgs":true,"family":"Shaffer","given":"T.L.","email":"","affiliations":[],"preferred":false,"id":417750,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Pietz, P.J.","contributorId":6398,"corporation":false,"usgs":true,"family":"Pietz","given":"P.J.","email":"","affiliations":[],"preferred":false,"id":417745,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Berkey, G.B.","contributorId":73399,"corporation":false,"usgs":true,"family":"Berkey","given":"G.B.","affiliations":[],"preferred":false,"id":417748,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Kadrmas, N.J.","contributorId":37140,"corporation":false,"usgs":true,"family":"Kadrmas","given":"N.J.","email":"","affiliations":[],"preferred":false,"id":417747,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":1001058,"text":"1001058 - 2006 - Ontogenesis of endangered humpback chub (Gila cypha) in the Little Colorado River, Arizona","interactions":[],"lastModifiedDate":"2023-02-09T16:47:04.075418","indexId":"1001058","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","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}},"title":"Ontogenesis of endangered humpback chub (Gila cypha) in the Little Colorado River, Arizona","docAbstract":"

The largest population of endangered humpback chub Gila cypha inhabits the Colorado River below Glen Canyon Dam and the lower 14 km of the Little Colorado River (LCR), Arizona. Currently, adults from both rivers spawn and their progenies grow and recruit to adulthood primarily within the LCR, where we studied G. cypha's life history using hoop net capture data. Humpback chub undergo an ontogenesis from diurnally active, vulnerable, nearshore-reliant young-of-the-year (YOY; 30–90 mm total length) into nocturnally active, large-bodied adults (≥180 mm TL). During the day, adults primarily resided in deep midchannel pools; however, at night they dispersed inshore amongst the higher densities of YOY conspecifics. Many YOY G. cypha shifted to nocturnal habitats that provided greater cover, possibly, to avoid inshore invading adults. These findings mirror predator-prey scenarios described in other freshwater assemblages, but do not refute other plausible hypotheses. Gila cypha piscivorous activity may escalate in hoop nets, which can confine fish of disparate sizes together; adults were significantly associated with YOY conspecifics and small dead fish in hoop nets at night and eight G. cypha (156–372 mm TL) regurgitated and/or defecated other fish body parts during handling following capture. Gila cypha can definitely be piscivorous given the opportunity, but the magnitude of their piscivorous activity in the wild is debatable.

","language":"English","publisher":"University of Notre Dame","doi":"10.1674/0003-0031(2006)155[0123:OOEHCG]2.0.CO;2","usgsCitation":"Stone, D.M., and Gorman, O.T., 2006, Ontogenesis of endangered humpback chub (Gila cypha) in the Little Colorado River, Arizona: American Midland Naturalist, v. 155, no. 1, p. 123-135, https://doi.org/10.1674/0003-0031(2006)155[0123:OOEHCG]2.0.CO;2.","productDescription":"13 p.","startPage":"123","endPage":"135","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":412909,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Arizona","otherGeospatial":"Little Colorado River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -111.95343017578125,\n 35.42486791930558\n ],\n [\n -110.89050292968749,\n 35.42486791930558\n ],\n [\n -110.89050292968749,\n 36.43233216371692\n ],\n [\n -111.95343017578125,\n 36.43233216371692\n ],\n [\n -111.95343017578125,\n 35.42486791930558\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"155","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a26e4b07f02db60fa52","contributors":{"authors":[{"text":"Stone, Dennis M.","contributorId":58237,"corporation":false,"usgs":false,"family":"Stone","given":"Dennis","email":"","middleInitial":"M.","affiliations":[{"id":6987,"text":"U.S. Fish and Wildlife Sevice","active":true,"usgs":false}],"preferred":false,"id":310363,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Gorman, Owen T. 0000-0003-0451-110X otgorman@usgs.gov","orcid":"https://orcid.org/0000-0003-0451-110X","contributorId":2888,"corporation":false,"usgs":true,"family":"Gorman","given":"Owen","email":"otgorman@usgs.gov","middleInitial":"T.","affiliations":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"preferred":true,"id":310362,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70030378,"text":"70030378 - 2006 - Characterization of surface and ground water δ18O seasonal variation and its use for estimating groundwater residence times","interactions":[],"lastModifiedDate":"2021-01-22T17:03:46.75923","indexId":"70030378","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1924,"text":"Hydrological Processes","active":true,"publicationSubtype":{"id":10}},"displayTitle":"Characterization of surface and ground water δ18O seasonal variation and its use for estimating groundwater residence times","title":"Characterization of surface and ground water δ18O seasonal variation and its use for estimating groundwater residence times","docAbstract":"

18O is an ideal tracer for characterizing hydrological processes because it can be reliably measured in several watershed hydrological compartments. Here, we present multiyear isotopic data, i.e. 18O variations (δ18O), for precipitation inputs, surface water and groundwater in the Shingobee River Headwaters Area (SRHA), a well-instrumented research catchment in north-central Minnesota. SRHA surface waters exhibit δ18O seasonal variations similar to those of groundwaters, and seasonal δ18O variations plotted versus time fit seasonal sine functions. These seasonal δ18O variations were interpreted to estimate surface water and groundwater mean residence times (MRTs) at sampling locations near topographically closed-basin lakes. MRT variations of about 1 to 16 years have been estimated over an area covering about 9 km2 from the basin boundary to the most downgradient well. Estimated MRT error (±0·3 to ±0·7 years) is small for short MRTs and is much larger (±10 years) for a well with an MRT (16 years) near the limit of the method. Groundwater transit time estimates based on Darcy's law, tritium content, and the seasonal δ18O amplitude approach appear to be consistent within the limits of each method. The results from this study suggest that use of the δ18O seasonal variation method to determine MRTs can help assess groundwater recharge areas in small headwaters catchments.

","language":"English","publisher":"Wiley","doi":"10.1002/hyp.5953","usgsCitation":"Reddy, M.M., Schuster, P.F., Kendall, C., and Reddy, M.B., 2006, Characterization of surface and ground water δ18O seasonal variation and its use for estimating groundwater residence times: Hydrological Processes, v. 20, no. 8, p. 1753-1772, https://doi.org/10.1002/hyp.5953.","productDescription":"20 p.","startPage":"1753","endPage":"1772","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":239168,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Minnesota","otherGeospatial":"Shingobee River Headwaters Area","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -95.152587890625,\n 46.33175800051563\n ],\n [\n -95.152587890625,\n 47.368594345213374\n ],\n [\n -93.69140625,\n 47.368594345213374\n ],\n [\n -93.69140625,\n 46.33175800051563\n ],\n [\n -95.152587890625,\n 46.33175800051563\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"20","issue":"8","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f4dde4b0c8380cd4bf85","contributors":{"authors":[{"text":"Reddy, Michael M. mmreddy@usgs.gov","contributorId":684,"corporation":false,"usgs":true,"family":"Reddy","given":"Michael","email":"mmreddy@usgs.gov","middleInitial":"M.","affiliations":[{"id":145,"text":"Branch of Regional Research-Central Region","active":false,"usgs":true}],"preferred":true,"id":426915,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schuster, Paul F. 0000-0002-8314-1372 pschuste@usgs.gov","orcid":"https://orcid.org/0000-0002-8314-1372","contributorId":1360,"corporation":false,"usgs":true,"family":"Schuster","given":"Paul","email":"pschuste@usgs.gov","middleInitial":"F.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":true,"id":426917,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Kendall, Carol 0000-0002-0247-3405 ckendall@usgs.gov","orcid":"https://orcid.org/0000-0002-0247-3405","contributorId":1462,"corporation":false,"usgs":true,"family":"Kendall","given":"Carol","email":"ckendall@usgs.gov","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":426916,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Reddy, Micaela B.","contributorId":7947,"corporation":false,"usgs":true,"family":"Reddy","given":"Micaela","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":426918,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70028536,"text":"70028536 - 2006 - Hydroacoustic estimation of zooplankton biomass at two shoal complexes in the Apostle Islands Region of Lake Superior","interactions":[],"lastModifiedDate":"2016-05-06T11:45:06","indexId":"70028536","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2330,"text":"Journal of Great Lakes Research","active":true,"publicationSubtype":{"id":10}},"title":"Hydroacoustic estimation of zooplankton biomass at two shoal complexes in the Apostle Islands Region of Lake Superior","docAbstract":"

Hydroacoustics can be used to assess zooplankton populations, however, backscatter must be scaled to be biologically meaningful. In this study, we used a general model to correlate site-specific hydroacoustic backscatter with zooplankton dry weight biomass estimated from net tows. The relationship between zooplankton dry weight and backscatter was significant (p < 0.001) and explained 76% of the variability in the dry weight data. We applied this regression to hydroacoustic data collected monthly in 2003 and 2004 at two shoals in the Apostle Island Region of Lake Superior. After applying the regression model to convert hydroacoustic backscatter to zooplankton dry weight biomass, we used geostatistics to analyze the mean and variance, and ordinary kriging to create spatial zooplankton distribution maps. The mean zooplankton dry weight biomass estimates from plankton net tows and hydroacoustics were not significantly different (p = 0.19) but the hydroacoustic data had a significantly lower coefficient of variation (p < 0.001). The maps of zooplankton distribution illustrated spatial trends in zooplankton dry weight biomass that were not discernable from the overall means.

","language":"English","publisher":"Elsevier","doi":"10.3394/0380-1330(2006)32[680:HEOZBA]2.0.CO;2","issn":"03801330","usgsCitation":"Holbrook, B., Hrabik, T., Branstrator, D., Yule, D., and Stockwell, J., 2006, Hydroacoustic estimation of zooplankton biomass at two shoal complexes in the Apostle Islands Region of Lake Superior: Journal of Great Lakes Research, v. 32, no. 4, p. 680-696, https://doi.org/10.3394/0380-1330(2006)32[680:HEOZBA]2.0.CO;2.","productDescription":"17 p.","startPage":"680","endPage":"696","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":236498,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"32","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3313e4b0c8380cd5ece2","contributors":{"authors":[{"text":"Holbrook, B.V.","contributorId":43957,"corporation":false,"usgs":true,"family":"Holbrook","given":"B.V.","email":"","affiliations":[],"preferred":false,"id":418496,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hrabik, T.R.","contributorId":95250,"corporation":false,"usgs":true,"family":"Hrabik","given":"T.R.","email":"","affiliations":[],"preferred":false,"id":418499,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Branstrator, D.K.","contributorId":51518,"corporation":false,"usgs":true,"family":"Branstrator","given":"D.K.","email":"","affiliations":[],"preferred":false,"id":418497,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Yule, D.L.","contributorId":78853,"corporation":false,"usgs":true,"family":"Yule","given":"D.L.","email":"","affiliations":[],"preferred":false,"id":418498,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Stockwell, J.D.","contributorId":19678,"corporation":false,"usgs":true,"family":"Stockwell","given":"J.D.","email":"","affiliations":[],"preferred":false,"id":418495,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70028844,"text":"70028844 - 2006 - Quantity-activity relationship of denitrifying bacteria and environmental scaling in streams of a forested watershed","interactions":[],"lastModifiedDate":"2012-03-12T17:20:58","indexId":"70028844","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2319,"text":"Journal of Geophysical Research G: Biogeosciences","active":true,"publicationSubtype":{"id":10}},"title":"Quantity-activity relationship of denitrifying bacteria and environmental scaling in streams of a forested watershed","docAbstract":"The spatial variability of subreach denitrification rates in streams was evaluated with respect to controlling environmental conditions, molecular examination of denitrifying bacteria, and dimensional analysis. Denitrification activities ranged from 0 and 800 ng-N gsed-1 d-1 with large variations observed within short distances (<50 m) along stream reaches. A log-normal probability distribution described the range in denitrification activities and was used to define low (16% of the probability distributibn), medium (68%), and high (16%) denitrification potential groups. Denitrifying bacteria were quantified using a competitive polymerase chain reaction (cPCR) technique that amplified the nirK gene that encodes for nitrite reductase. Results showed a range of nirK quantities from 103 to 107 gene-copy-number gsed.-1 A nonparametric statistical test showed no significant difference in nirK quantifies among stream reaches, but revealed that samples with a high denitrification potential had significantly higher nirK quantities. Denitrification activity was positively correlated with nirK quantities with scatter in the data that can be attributed to varying environmental conditions along stream reaches. Dimensional analysis was used to evaluate denitrification activities according to environmental variables that describe fluid-flow properties, nitrate and organic material quantities, and dissolved oxygen flux. Buckingham's pi theorem was used to generate dimensionless groupings and field data were used to determine scaling parameters. The resulting expressions between dimensionless NO3- flux and dimensionless groupings of environmental variables showed consistent scaling, which indicates that the subreach variability in denitrification rates can be predicted by the controlling physical, chemical, and microbiological conditions. Copyright 2006 by the American Geophysical Union.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Geophysical Research G: Biogeosciences","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1029/2006JG000254","issn":"01480227","usgsCitation":"O’Connor, B., Hondzo, M., Dobraca, D., LaPara, T., Finlay, J., and Brezonik, P., 2006, Quantity-activity relationship of denitrifying bacteria and environmental scaling in streams of a forested watershed: Journal of Geophysical Research G: Biogeosciences, v. 111, no. 4, https://doi.org/10.1029/2006JG000254.","costCenters":[],"links":[{"id":477469,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2006jg000254","text":"Publisher Index Page"},{"id":209642,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2006JG000254"},{"id":236306,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"111","issue":"4","noUsgsAuthors":false,"publicationDate":"2006-11-30","publicationStatus":"PW","scienceBaseUri":"505a924ce4b0c8380cd80794","contributors":{"authors":[{"text":"O’Connor, B.L.","contributorId":24977,"corporation":false,"usgs":true,"family":"O’Connor","given":"B.L.","email":"","affiliations":[],"preferred":false,"id":419956,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hondzo, Miki","contributorId":11816,"corporation":false,"usgs":false,"family":"Hondzo","given":"Miki","email":"","affiliations":[{"id":12693,"text":"Department of Civil, Environmental, and Geo- Engineering and St. Anthony Falls Laboratory, Minneapolis, MN","active":true,"usgs":false}],"preferred":false,"id":419954,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Dobraca, D.","contributorId":99755,"corporation":false,"usgs":true,"family":"Dobraca","given":"D.","email":"","affiliations":[],"preferred":false,"id":419959,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"LaPara, T.M.","contributorId":24150,"corporation":false,"usgs":true,"family":"LaPara","given":"T.M.","email":"","affiliations":[],"preferred":false,"id":419955,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Finlay, J.A.","contributorId":98097,"corporation":false,"usgs":true,"family":"Finlay","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":419958,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Brezonik, P.L.","contributorId":27001,"corporation":false,"usgs":true,"family":"Brezonik","given":"P.L.","email":"","affiliations":[],"preferred":false,"id":419957,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70028440,"text":"70028440 - 2006 - Increasing streamflow and baseflow in Mississippi River since the 1940 s: Effect of land use change","interactions":[],"lastModifiedDate":"2012-03-12T17:20:54","indexId":"70028440","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","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":"Increasing streamflow and baseflow in Mississippi River since the 1940 s: Effect of land use change","docAbstract":"A trend of increasing streamflow has been observed in the Mississippi River (MR) basin since the 1940 s as a result of increased precipitation. Herein we show that increasing MR flow is mainly in its baseflow as a result of land use change and accompanying agricultural activities that occurred in the MR basin during the last 60 years. Agricultural land use change in the MR basin has affected the basin-scale hydrology: more precipitation is being routed into streams as baseflow than stormflow since 1940 s. We explain that the conversion of perennial vegetation to seasonal row crops, especially soybeans, in the basin since 1940 s may have reduced evapotranspiration, increased groundwater recharge, and thus increased baseflow and streamflow. This explanation is supported with a data analysis of the annually and monthly flow rates at various river stations in the MR basin. Results from this study will help to direct our effort in managing land use and in reducing nutrient levels in MR and other major rivers since nutrient concentrations and loads carried by storm water and baseflow are different. ?? 2005 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.2005.09.033","issn":"00221694","usgsCitation":"Zhang, Y., and Schilling, K.E., 2006, Increasing streamflow and baseflow in Mississippi River since the 1940 s: Effect of land use change: Journal of Hydrology, v. 324, no. 1-4, p. 412-422, https://doi.org/10.1016/j.jhydrol.2005.09.033.","startPage":"412","endPage":"422","numberOfPages":"11","costCenters":[],"links":[{"id":210300,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jhydrol.2005.09.033"},{"id":237178,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"324","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3a07e4b0c8380cd61b12","contributors":{"authors":[{"text":"Zhang, Y.-K.","contributorId":44309,"corporation":false,"usgs":true,"family":"Zhang","given":"Y.-K.","email":"","affiliations":[],"preferred":false,"id":418056,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schilling, K. E.","contributorId":61982,"corporation":false,"usgs":true,"family":"Schilling","given":"K.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":418057,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70028506,"text":"70028506 - 2006 - An agreement coefficient for image comparison","interactions":[],"lastModifiedDate":"2018-02-21T15:41:30","indexId":"70028506","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3052,"text":"Photogrammetric Engineering and Remote Sensing","active":true,"publicationSubtype":{"id":10}},"title":"An agreement coefficient for image comparison","docAbstract":"

Combination of datasets acquired from different sensor systems is necessary to construct a long time-series dataset for remotely sensed land-surface variables. Assessment of the agreement of the data derived from various sources is an important issue in understanding the data continuity through the time-series. Some traditional measures, including correlation coefficient, coefficient of determination, mean absolute error, and root mean square error, are not always optimal for evaluating the data agreement. For this reason, we developed a new agreement coefficient for comparing two different images. The agreement coefficient has the following properties: non-dimensional, bounded, symmetric, and distinguishable between systematic and unsystematic differences. The paper provides examples of agreement analyses for hypothetical data and actual remotely sensed data. The results demonstrate that the agreement coefficient does include the above properties, and therefore is a useful tool for image comparison.

","language":"English","publisher":"Ingenta","doi":"10.14358/PERS.72.7.823","issn":"00991112","usgsCitation":"Ji, L., and Gallo, K., 2006, An agreement coefficient for image comparison: Photogrammetric Engineering and Remote Sensing, v. 72, no. 7, p. 823-833, https://doi.org/10.14358/PERS.72.7.823.","productDescription":"11 p.","startPage":"823","endPage":"833","numberOfPages":"11","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"links":[{"id":477475,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.14358/pers.72.7.823","text":"Publisher Index Page"},{"id":236565,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg","text":"https://pubs.er.usgs.gov/manager/#spn-pane"}],"volume":"72","issue":"7","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e9e7e4b0c8380cd48505","contributors":{"authors":[{"text":"Ji, Lei 0000-0002-6133-1036 lji@usgs.gov","orcid":"https://orcid.org/0000-0002-6133-1036","contributorId":2832,"corporation":false,"usgs":true,"family":"Ji","given":"Lei","email":"lji@usgs.gov","affiliations":[{"id":223,"text":"Earth Resources Observation and Science (EROS) Center (Geography)","active":false,"usgs":true}],"preferred":false,"id":418368,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Gallo, Kevin 0000-0001-9162-5011 kgallo@usgs.gov","orcid":"https://orcid.org/0000-0001-9162-5011","contributorId":192334,"corporation":false,"usgs":true,"family":"Gallo","given":"Kevin","email":"kgallo@usgs.gov","affiliations":[],"preferred":true,"id":418367,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70028568,"text":"70028568 - 2006 - Predicting tree species presence and basal area in Utah: A comparison of stochastic gradient boosting, generalized additive models, and tree-based methods","interactions":[],"lastModifiedDate":"2012-03-12T17:20:58","indexId":"70028568","displayToPublicDate":"2006-01-01T00:00:00","publicationYear":"2006","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1458,"text":"Ecological Modelling","active":true,"publicationSubtype":{"id":10}},"title":"Predicting tree species presence and basal area in Utah: A comparison of stochastic gradient boosting, generalized additive models, and tree-based methods","docAbstract":"Many efforts are underway to produce broad-scale forest attribute maps by modelling forest class and structure variables collected in forest inventories as functions of satellite-based and biophysical information. Typically, variants of classification and regression trees implemented in Rulequest's?? See5 and Cubist (for binary and continuous responses, respectively) are the tools of choice in many of these applications. These tools are widely used in large remote sensing applications, but are not easily interpretable, do not have ties with survey estimation methods, and use proprietary unpublished algorithms. Consequently, three alternative modelling techniques were compared for mapping presence and basal area of 13 species located in the mountain ranges of Utah, USA. The modelling techniques compared included the widely used See5/Cubist, generalized additive models (GAMs), and stochastic gradient boosting (SGB). Model performance was evaluated using independent test data sets. Evaluation criteria for mapping species presence included specificity, sensitivity, Kappa, and area under the curve (AUC). Evaluation criteria for the continuous basal area variables included correlation and relative mean squared error. For predicting species presence (setting thresholds to maximize Kappa), SGB had higher values for the majority of the species for specificity and Kappa, while GAMs had higher values for the majority of the species for sensitivity. In evaluating resultant AUC values, GAM and/or SGB models had significantly better results than the See5 models where significant differences could be detected between models. For nine out of 13 species, basal area prediction results for all modelling techniques were poor (correlations less than 0.5 and relative mean squared errors greater than 0.8), but SGB provided the most stable predictions in these instances. SGB and Cubist performed equally well for modelling basal area for three species with moderate prediction success, while all three modelling tools produced comparably good predictions (correlation of 0.68 and relative mean squared error of 0.56) for one species. ?? 2006 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ecological Modelling","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.ecolmodel.2006.05.021","issn":"03043800","usgsCitation":"Moisen, G.G., Freeman, E., Blackard, J., Frescino, T., Zimmermann, N., and Edwards, T., 2006, Predicting tree species presence and basal area in Utah: A comparison of stochastic gradient boosting, generalized additive models, and tree-based methods: Ecological Modelling, v. 199, no. 2, p. 176-187, https://doi.org/10.1016/j.ecolmodel.2006.05.021.","startPage":"176","endPage":"187","numberOfPages":"12","costCenters":[],"links":[{"id":209810,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.ecolmodel.2006.05.021"},{"id":236533,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"199","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a81dde4b0c8380cd7b798","contributors":{"authors":[{"text":"Moisen, Gretchen G.","contributorId":15781,"corporation":false,"usgs":false,"family":"Moisen","given":"Gretchen","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":418643,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Freeman, E.A.","contributorId":80885,"corporation":false,"usgs":true,"family":"Freeman","given":"E.A.","email":"","affiliations":[],"preferred":false,"id":418646,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Blackard, J.A.","contributorId":103060,"corporation":false,"usgs":true,"family":"Blackard","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":418648,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Frescino, T.S.","contributorId":94485,"corporation":false,"usgs":true,"family":"Frescino","given":"T.S.","email":"","affiliations":[],"preferred":false,"id":418647,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Zimmermann, N.E.","contributorId":24547,"corporation":false,"usgs":true,"family":"Zimmermann","given":"N.E.","email":"","affiliations":[],"preferred":false,"id":418644,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Edwards, T.C. Jr. 0000-0002-0773-0909","orcid":"https://orcid.org/0000-0002-0773-0909","contributorId":76486,"corporation":false,"usgs":true,"family":"Edwards","given":"T.C.","suffix":"Jr.","affiliations":[],"preferred":false,"id":418645,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ]}