{"pageNumber":"962","pageRowStart":"24025","pageSize":"25","recordCount":68937,"records":[{"id":70029878,"text":"70029878 - 2007 - Development and implementation of a Bayesian-based aquifer vulnerability assessment in Florida","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029878","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2832,"text":"Natural Resources Research","onlineIssn":"1573-8981","printIssn":"1520-7439","active":true,"publicationSubtype":{"id":10}},"title":"Development and implementation of a Bayesian-based aquifer vulnerability assessment in Florida","docAbstract":"The Florida Aquifer Vulnerability Assessment (FAVA) was designed to provide a tool for environmental, regulatory, resource management, and planning professionals to facilitate protection of groundwater resources from surface sources of contamination. The FAVA project implements weights-of-evidence (WofE), a data-driven, Bayesian-probabilistic model to generate a series of maps reflecting relative aquifer vulnerability of Florida's principal aquifer systems. The vulnerability assessment process, from project design to map implementation is described herein in reference to the Floridan aquifer system (FAS). The WofE model calculates weighted relationships between hydrogeologic data layers that influence aquifer vulnerability and ambient groundwater parameters in wells that reflect relative degrees of vulnerability. Statewide model input data layers (evidential themes) include soil hydraulic conductivity, density of karst features, thickness of aquifer confinement, and hydraulic head difference between the FAS and the watertable. Wells with median dissolved nitrogen concentrations exceeding statistically established thresholds serve as training points in the WofE model. The resulting vulnerability map (response theme) reflects classified posterior probabilities based on spatial relationships between the evidential themes and training points. The response theme is subjected to extensive sensitivity and validation testing. Among the model validation techniques is calculation of a response theme based on a different water-quality indicator of relative recharge or vulnerability: dissolved oxygen. Successful implementation of the FAVA maps was facilitated by the overall project design, which included a needs assessment and iterative technical advisory committee input and review. Ongoing programs to protect Florida's springsheds have led to development of larger-scale WofE-based vulnerability assessments. Additional applications of the maps include land-use planning amendments and prioritization of land purchases to protect groundwater resources. ?? International Association for Mathematical Geology 2007.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Natural Resources Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s11053-007-9038-5","issn":"15207439","usgsCitation":"Arthur, J.D., Wood, H., Baker, A., Cichon, J., and Raines, G.L., 2007, Development and implementation of a Bayesian-based aquifer vulnerability assessment in Florida: Natural Resources Research, v. 16, no. 2, p. 93-107, https://doi.org/10.1007/s11053-007-9038-5.","startPage":"93","endPage":"107","numberOfPages":"15","costCenters":[],"links":[{"id":212867,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s11053-007-9038-5"},{"id":240425,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"16","issue":"2","noUsgsAuthors":false,"publicationDate":"2007-06-02","publicationStatus":"PW","scienceBaseUri":"505a0024e4b0c8380cd4f5ea","contributors":{"authors":[{"text":"Arthur, J. D.","contributorId":67924,"corporation":false,"usgs":true,"family":"Arthur","given":"J.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":424705,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wood, H.A.R.","contributorId":10623,"corporation":false,"usgs":true,"family":"Wood","given":"H.A.R.","email":"","affiliations":[],"preferred":false,"id":424703,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Baker, A.E.","contributorId":54022,"corporation":false,"usgs":true,"family":"Baker","given":"A.E.","email":"","affiliations":[],"preferred":false,"id":424704,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Cichon, J.R.","contributorId":68115,"corporation":false,"usgs":true,"family":"Cichon","given":"J.R.","email":"","affiliations":[],"preferred":false,"id":424706,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Raines, G. L.","contributorId":90720,"corporation":false,"usgs":true,"family":"Raines","given":"G.","middleInitial":"L.","affiliations":[],"preferred":false,"id":424707,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70029877,"text":"70029877 - 2007 - Mercury and selenium in American White Pelicans breeding at Pyramid Lake, Nevada","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029877","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3731,"text":"Waterbirds","onlineIssn":"19385390","printIssn":"15244695","active":true,"publicationSubtype":{"id":10}},"title":"Mercury and selenium in American White Pelicans breeding at Pyramid Lake, Nevada","docAbstract":"American White Pelicans (Pelecanus erythrorhynchos) that breed on Anaho Island, Pyramid Lake, Nevada, are potentially exposed to a variety of contaminants. Therefore, the reproductive success of this colony was monitored in 1996 and eggs, blood and feathers from nestlings, livers from adults and nestlings, regurgitated fish from nestlings, and fish from representative feeding areas were collected and analyzed for mercury and selenium to determine exposure to the pelicans and sources of contamination. Additional samples were collected and analyzed in 1988, 1992, and 2004. Reproductive success at the Anaho Island colony was normal in 1996 based on hatching rates of eggs (???75% in undisturbed areas) and survival of nestlings. Mercury and selenium concentrations in eggs were generally below known effect levels and did not appear to have an adverse impact on hatching success. Mercury and selenium concentrations in fish ranged widely, with mercury of greatest concern. Microscopic lesions characteristic of mercury toxicity were absent in pre-fledging nestlings in 1996. Some adult pelicans had elevated mercury concentrations in their livers; however, the potential toxic effects were difficult to evaluate because of probable demethylation of mercury, thereby possibly providing protection from toxicity. Exposure of pelicans to mercury varied among years, most likely in relation to wet-dry cycles and available feeding areas.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Waterbirds","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1675/1524-4695(2007)30[284:MASIAW]2.0.CO;2","issn":"15244695","usgsCitation":"Wiemeyer, S.N., Miesner, J., Tuttle, P.L., Murphy, E., Sileo, L., and Withers, D., 2007, Mercury and selenium in American White Pelicans breeding at Pyramid Lake, Nevada: Waterbirds, v. 30, no. 2, p. 284-295, https://doi.org/10.1675/1524-4695(2007)30[284:MASIAW]2.0.CO;2.","startPage":"284","endPage":"295","numberOfPages":"12","costCenters":[],"links":[{"id":212866,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1675/1524-4695(2007)30[284:MASIAW]2.0.CO;2"},{"id":240424,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"30","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a53e1e4b0c8380cd6cda2","contributors":{"authors":[{"text":"Wiemeyer, Stanley N.","contributorId":78279,"corporation":false,"usgs":true,"family":"Wiemeyer","given":"Stanley","email":"","middleInitial":"N.","affiliations":[],"preferred":false,"id":424699,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Miesner, J.F.","contributorId":79509,"corporation":false,"usgs":true,"family":"Miesner","given":"J.F.","email":"","affiliations":[],"preferred":false,"id":424700,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Tuttle, P. L.","contributorId":101280,"corporation":false,"usgs":true,"family":"Tuttle","given":"P.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":424702,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Murphy, E.C.","contributorId":86745,"corporation":false,"usgs":true,"family":"Murphy","given":"E.C.","email":"","affiliations":[],"preferred":false,"id":424701,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Sileo, L.","contributorId":46895,"corporation":false,"usgs":true,"family":"Sileo","given":"L.","email":"","affiliations":[],"preferred":false,"id":424698,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Withers, D.","contributorId":19370,"corporation":false,"usgs":true,"family":"Withers","given":"D.","email":"","affiliations":[],"preferred":false,"id":424697,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}}
,{"id":70029874,"text":"70029874 - 2007 - Competition between hardwood hammocks and mangroves","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029874","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1478,"text":"Ecosystems","active":true,"publicationSubtype":{"id":10}},"title":"Competition between hardwood hammocks and mangroves","docAbstract":"The boundaries between mangroves and freshwater hammocks in coastal ecotones of South Florida are sharp. Further, previous studies indicate that there is a discontinuity in plant predawn water potentials, with woody plants either showing predawn water potentials reflecting exposure to saline water or exposure to freshwater. This abrupt concurrent change in community type and plant water status suggests that there might be feedback dynamics between vegetation and salinity. A model examining the salinity of the aerated zone of soil overlying a saline body of water, known as the vadose layer, as a function of precipitation, evaporation and plant water uptake is presented here. The model predicts that mixtures of saline and freshwater vegetative species represent unstable states. Depending on the initial vegetation composition, subsequent vegetative change will lead either to patches of mangrove coverage having a high salinity vadose zone or to freshwater hammock coverage having a low salinity vadose zone. Complete or nearly complete coverage by either freshwater or saltwater vegetation represents two stable steady-state points. This model can explain many of the previous observations of vegetation patterns in coastal South Florida as well as observations on the dynamics of vegetation shifts caused by sea level rise and climate change. ?? 2007 Springer Science+Business Media, LLC.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ecosystems","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10021-007-9050-y","issn":"14329840","usgsCitation":"Sternberg, L., Teh, S., Ewe, S., Miralles-Wilhelm, F., and DeAngelis, D., 2007, Competition between hardwood hammocks and mangroves: Ecosystems, v. 10, no. 4, p. 648-660, https://doi.org/10.1007/s10021-007-9050-y.","startPage":"648","endPage":"660","numberOfPages":"13","costCenters":[],"links":[{"id":212838,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10021-007-9050-y"},{"id":240388,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"10","issue":"4","noUsgsAuthors":false,"publicationDate":"2007-05-22","publicationStatus":"PW","scienceBaseUri":"5059f8cce4b0c8380cd4d2d6","contributors":{"authors":[{"text":"Sternberg, L.D.S.L.","contributorId":41223,"corporation":false,"usgs":true,"family":"Sternberg","given":"L.D.S.L.","email":"","affiliations":[],"preferred":false,"id":424687,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Teh, S.Y.","contributorId":22969,"corporation":false,"usgs":true,"family":"Teh","given":"S.Y.","email":"","affiliations":[],"preferred":false,"id":424685,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ewe, S.M.L.","contributorId":78496,"corporation":false,"usgs":true,"family":"Ewe","given":"S.M.L.","email":"","affiliations":[],"preferred":false,"id":424688,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Miralles-Wilhelm, F.","contributorId":97325,"corporation":false,"usgs":true,"family":"Miralles-Wilhelm","given":"F.","affiliations":[],"preferred":false,"id":424689,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"DeAngelis, D.L. 0000-0002-1570-4057","orcid":"https://orcid.org/0000-0002-1570-4057","contributorId":32470,"corporation":false,"usgs":true,"family":"DeAngelis","given":"D.L.","affiliations":[],"preferred":false,"id":424686,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70029873,"text":"70029873 - 2007 - Effects of intraborehole flow on groundwater age distribution","interactions":[],"lastModifiedDate":"2018-10-11T19:02:24","indexId":"70029873","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1923,"text":"Hydrogeology Journal","active":true,"publicationSubtype":{"id":10}},"title":"Effects of intraborehole flow on groundwater age distribution","docAbstract":"<p>Environmental tracers are used to estimate groundwater ages and travel times, but the strongly heterogeneous nature of many subsurface environments can cause mixing between waters of highly disparate ages, adding additional complexity to the age-estimation process. Mixing may be exacerbated by the presence of wells because long open intervals or long screens with openings at multiple depths can transport water and solutes rapidly over a large vertical distance. The effect of intraborehole flow on groundwater age was examined numerically using direct age transport simulation coupled with the Multi-Node Well Package of MODFLOW. Ages in a homogeneous, anisotropic aquifer reached a predevelopment steady state possessing strong depth dependence. A nonpumping multi-node well was then introduced in one of three locations within the system. In all three cases, vertical transport along the well resulted in substantial changes in age distributions within the system. After a pumping well was added near the nonpumping multi-node well, ages were further perturbed by a flow reversal in the nonpumping multi-node well. Results indicated that intraborehole flow can substantially alter groundwater ages, but the effects are highly dependent on local or regional flow conditions and may change with time.</p>","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Hydrogeology Journal","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10040-006-0139-8","issn":"14312174","usgsCitation":"Zinn, B., and Konikow, L.F., 2007, Effects of intraborehole flow on groundwater age distribution: Hydrogeology Journal, v. 15, no. 4, p. 633-643, https://doi.org/10.1007/s10040-006-0139-8.","productDescription":"11 p.","startPage":"633","endPage":"643","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":240353,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212809,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10040-006-0139-8"}],"volume":"15","issue":"4","noUsgsAuthors":false,"publicationDate":"2007-01-09","publicationStatus":"PW","scienceBaseUri":"505a0728e4b0c8380cd515ac","contributors":{"authors":[{"text":"Zinn, B.A.","contributorId":78153,"corporation":false,"usgs":true,"family":"Zinn","given":"B.A.","email":"","affiliations":[],"preferred":false,"id":424684,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Konikow, Leonard F. 0000-0002-0940-3856 lkonikow@usgs.gov","orcid":"https://orcid.org/0000-0002-0940-3856","contributorId":158,"corporation":false,"usgs":true,"family":"Konikow","given":"Leonard","email":"lkonikow@usgs.gov","middleInitial":"F.","affiliations":[{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":true,"id":424683,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70029872,"text":"70029872 - 2007 - Authigenic carbonate formation at hydrocarbon seeps in continental margin sediments: A comparative study","interactions":[],"lastModifiedDate":"2023-08-04T11:36:10.550416","indexId":"70029872","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","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":"Authigenic carbonate formation at hydrocarbon seeps in continental margin sediments: A comparative study","docAbstract":"<p>Authigenic carbonates from five continental margin locations, the Eel River Basin, Monterey Bay, Santa Barbara Basin, the Sea of Okhotsk, and the North Sea, exhibit a wide range of mineralogical and stable isotopic compositions. These precipitates include aragonite, low- and high-Mg calcite, and dolomite. The carbon isotopic composition of carbonates varies widely, ranging from −60‰ to +26‰, indicating complex carbon sources that include<span>&nbsp;</span><sup>13</sup>C-depleted microbial and thermogenic methane and residual,<span>&nbsp;</span><sup>13</sup>C-enriched, bicarbonate. A similarly large variability of<span>&nbsp;</span><i>δ</i><sup>18</sup>O values (−5.5‰ to +8.9‰) demonstrates the geochemical complexity of these sites, with some samples pointing toward an<span>&nbsp;</span><sup>18</sup>O-enriched oxygen source possibly related to advection of<span>&nbsp;</span><sup>18</sup>O-enriched formation water or to the decomposition of gas hydrate. Samples depleted in<span>&nbsp;</span><sup>18</sup>O are consistent with formation deeper in the sediment or mixing of pore fluids with meteoric water during carbonate precipitation.</p><p>A wide range of isotopic and mineralogical variation in authigenic carbonate composition within individual study areas but common trends across multiple geographic areas suggest that these parameters alone are not indicative for certain tectonic or geochemical settings. Rather, the observed variations probably reflect local controls on the flux of carbon and other reduced ions, such as faults, fluid conduits, the presence or absence of gas hydrate in the sediment, and the temporal evolution of the local carbon reservoir.</p><p>Areas with seafloor carbonates that indicate formation at greater depth below the sediment–water interface must have undergone uplift and erosion in the past or are still being uplifted. Consequently, the occurrence of carbonate slabs on the seafloor in areas of active hydrocarbon seepage is commonly an indicator of exhumation following carbonate precipitation in the shallow subsurface. Therefore, careful petrographic and geochemical analyses are critical components necessary for the correct interpretation of processes related to hydrocarbon seepage in continental margin environments and elsewhere.</p>","language":"English","publisher":"Elsevier","doi":"10.1016/j.dsr2.2007.04.010","issn":"09670645","usgsCitation":"Naehr, T., Eichhubl, P., Orphan, V., Hovland, M., Paull, C.K., Ussler, W., Lorenson, T., and Greene, H., 2007, Authigenic carbonate formation at hydrocarbon seeps in continental margin sediments: A comparative study: Deep-Sea Research Part II: Topical Studies in Oceanography, v. 54, no. 11-13, p. 1268-1291, https://doi.org/10.1016/j.dsr2.2007.04.010.","productDescription":"24 p.","startPage":"1268","endPage":"1291","numberOfPages":"24","costCenters":[],"links":[{"id":240352,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"54","issue":"11-13","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059eeede4b0c8380cd4a033","contributors":{"authors":[{"text":"Naehr, T.H.","contributorId":87758,"corporation":false,"usgs":true,"family":"Naehr","given":"T.H.","email":"","affiliations":[],"preferred":false,"id":424680,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Eichhubl, P.","contributorId":9060,"corporation":false,"usgs":true,"family":"Eichhubl","given":"P.","email":"","affiliations":[],"preferred":false,"id":424676,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Orphan, V.J.","contributorId":96902,"corporation":false,"usgs":true,"family":"Orphan","given":"V.J.","affiliations":[],"preferred":false,"id":424681,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hovland, M.","contributorId":51487,"corporation":false,"usgs":true,"family":"Hovland","given":"M.","email":"","affiliations":[],"preferred":false,"id":424678,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Paull, C. K.","contributorId":86845,"corporation":false,"usgs":false,"family":"Paull","given":"C.","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":424679,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Ussler, W. III","contributorId":101048,"corporation":false,"usgs":true,"family":"Ussler","given":"W.","suffix":"III","affiliations":[],"preferred":false,"id":424682,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Lorenson, T.D.","contributorId":7715,"corporation":false,"usgs":true,"family":"Lorenson","given":"T.D.","email":"","affiliations":[],"preferred":false,"id":424675,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Greene, H. Gary","contributorId":38958,"corporation":false,"usgs":true,"family":"Greene","given":"H. Gary","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":424677,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}}
,{"id":70029861,"text":"70029861 - 2007 - Long-term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary with exotic macrophytes and improving water quality","interactions":[],"lastModifiedDate":"2012-03-12T17:21:08","indexId":"70029861","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2620,"text":"Limnology and Oceanography","active":true,"publicationSubtype":{"id":10}},"title":"Long-term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary with exotic macrophytes and improving water quality","docAbstract":"We assessed species-specific coverage (km2) of a submerged aquatic vegetation (SAV) community in the fresh and upper oligohaline Potomac Estuary from 1985 to 2001 using a method combining field observations of species-proportional coverage data with congruent remotely sensed coverage and density (percent canopy cover) data. Biomass (estimated by density-weighted coverage) of individual species was calculated. Under improving water quality conditions, exotic SAV species did not displace native SAV; rather, the percent of natives increased over time. While coverage-based diversity did fluctuate and increased, richness-based community turnover rates were not significantly different from zero. SAV diversity was negatively related to nitrogen concentration. Differences in functional traits, such as reproductive potential, between the dominant native and exotic species may explain some interannual patterns in SAV. Biomass of native, as well as exotic, SAV species varied with factors affecting water column light attenuation. We also show a positive response by a higher trophic level, waterfowl, to SAV communities dominated by exotic SAV from 1959 to 2001. ?? 2007, by the American Society of Limnology and Oceanography, Inc.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Limnology and Oceanography","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"00243590","usgsCitation":"Rybicki, N.B., and Landwehr, J., 2007, Long-term changes in abundance and diversity of macrophyte and waterfowl populations in an estuary with exotic macrophytes and improving water quality: Limnology and Oceanography, v. 52, no. 3, p. 1195-1207.","startPage":"1195","endPage":"1207","numberOfPages":"13","costCenters":[],"links":[{"id":240178,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"52","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a497be4b0c8380cd68647","contributors":{"authors":[{"text":"Rybicki, N. B.","contributorId":97504,"corporation":false,"usgs":true,"family":"Rybicki","given":"N.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":424636,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Landwehr, J.M.","contributorId":39815,"corporation":false,"usgs":true,"family":"Landwehr","given":"J.M.","email":"","affiliations":[],"preferred":false,"id":424635,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70029858,"text":"70029858 - 2007 - Invasive species and coal bed methane development in the Powder River Basin, Wyoming","interactions":[],"lastModifiedDate":"2012-03-12T17:21:35","indexId":"70029858","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1552,"text":"Environmental Monitoring and Assessment","onlineIssn":"1573-2959","printIssn":"0167-6369","active":true,"publicationSubtype":{"id":10}},"title":"Invasive species and coal bed methane development in the Powder River Basin, Wyoming","docAbstract":"One of the fastest growing areas of natural gas production is coal bed methane (CBM) due to the large monetary returns and increased demand for energy from consumers. The Powder River Basin, Wyoming is one of the most rapidly expanding areas of CBM development with projections of the establishment of up to 50,000 wells. CBM disturbances may make the native ecosystem more susceptible to invasion by non-native species, but there are few studies that have been conducted on the environmental impacts of this type of resource extraction. To evaluate the potential effects of CBM development on native plant species distribution and patterns of non-native plant invasion, 36 modified Forest Inventory and Analysis plots (each comprised of four 168-m2 subplots) were established in the Powder River Basin, Wyoming. There were 73 168-m2 subplots on control sites; 42 subplots on secondary disturbances; 14 on major surface disturbances; eight on well pads; and seven on sites downslope of CBM wells water discharge points. Native plant species cover ranged from 39.5 ?? 2.7% (mean ?? 1 SE) in the secondary disturbance subplots to 17.7 ?? 7.5% in the pad subplots. Non-native plant species cover ranged from 31.0 ?? 8.4% in the discharge areas to 14.7 ?? 8.9% in the pad subplots. The control subplots had significantly less non-native species richness than the combined disturbance types. The combined disturbance subplots had significantly greater soil salinity than the control sites. These results suggest that CBM development and associated disturbances may facilitate the establishment of non-native plants. Future research and management decisions should consider the accumulative landscape-scale effects of CBM development on preserving native plant diversity. ?? Springer Science+Business Media B.V. 2006.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Environmental Monitoring and Assessment","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10661-006-9321-7","issn":"01676369","usgsCitation":"Bergquist, E., Evangelista, P., Stohlgren, T., and Alley, N., 2007, Invasive species and coal bed methane development in the Powder River Basin, Wyoming: Environmental Monitoring and Assessment, v. 128, no. 1-3, p. 381-394, https://doi.org/10.1007/s10661-006-9321-7.","startPage":"381","endPage":"394","numberOfPages":"14","costCenters":[],"links":[{"id":213092,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10661-006-9321-7"},{"id":240681,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"128","issue":"1-3","noUsgsAuthors":false,"publicationDate":"2006-10-03","publicationStatus":"PW","scienceBaseUri":"505a3e26e4b0c8380cd63b44","contributors":{"authors":[{"text":"Bergquist, E.","contributorId":43969,"corporation":false,"usgs":true,"family":"Bergquist","given":"E.","email":"","affiliations":[],"preferred":false,"id":424620,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Evangelista, P.","contributorId":21903,"corporation":false,"usgs":true,"family":"Evangelista","given":"P.","email":"","affiliations":[],"preferred":false,"id":424619,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Stohlgren, T.J.","contributorId":7217,"corporation":false,"usgs":true,"family":"Stohlgren","given":"T.J.","email":"","affiliations":[],"preferred":false,"id":424618,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Alley, N.","contributorId":86723,"corporation":false,"usgs":true,"family":"Alley","given":"N.","email":"","affiliations":[],"preferred":false,"id":424621,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70029853,"text":"70029853 - 2007 - Effects of prolonged exposure to perchlorate on thyroid and reproductive function in zebrafish","interactions":[],"lastModifiedDate":"2012-03-12T17:21:06","indexId":"70029853","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3608,"text":"Toxicological Sciences","active":true,"publicationSubtype":{"id":10}},"title":"Effects of prolonged exposure to perchlorate on thyroid and reproductive function in zebrafish","docAbstract":"The objectives of this study were to determine the effects of prolonged exposure to perchlorate on (1) thyroid status and reproductive performance of adult zebrafish (Danio rerio) and (2) F1 embryo survival and early larval development. Using a static-renewal procedure, mixed sex populations of adult zebrafish were exposed to 0, 10, and 100 mg/l nominal concentrations of waterborne perchlorate for 10 weeks. Thyroid histology was qualitatively assessed, and females and males were separated and further exposed to their respective treatments for six additional weeks. Eight females in each tank replicate (n = 3) were paired weekly with four males from the same respective treatment, and packed-egg (spawn) volume (PEV) was measured each of the last five weeks. At least once during weeks 14-16 of exposure, other end points measured included fertilization rate, fertilized egg diameter, hatching rate, standard length, and craniofacial development of 4-day-postfertilization larvae and thyroid hormone content of 3.5-h embryos and of exposed mothers. At 10 weeks of exposure, perchlorate at both concentrations caused thyroidal hypertrophy and colloid depletion. A marked reduction in PEV was observed toward the end of the 6-week spawning period, but fertilization and embryo hatching rates were unaffected. Fertilized egg diameter and larval length were increased by parental exposure to perchlorate. Larval head depth was unaffected but the forward protrusion of the lower jaw-associated cartilage complexes, Meckel's and ceratohyal, was decreased. Exposure to both concentrations of perchlorate inhibited whole-body thyroxine content in mothers and embryos, but triiodothyronine content was unchanged. In conclusion, prolonged exposure of adult zebrafish to perchlorate not only disrupts their thyroid endocrine system but also impairs reproduction and influences early F1 development. ?? 2007 Oxford University Press.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Toxicological Sciences","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1093/toxsci/kfm001","issn":"10966080","usgsCitation":"Mukhi, S., and Patino, R., 2007, Effects of prolonged exposure to perchlorate on thyroid and reproductive function in zebrafish: Toxicological Sciences, v. 96, no. 2, p. 246-254, https://doi.org/10.1093/toxsci/kfm001.","startPage":"246","endPage":"254","numberOfPages":"9","costCenters":[],"links":[{"id":477218,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1093/toxsci/kfm001","text":"Publisher Index Page"},{"id":212978,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1093/toxsci/kfm001"},{"id":240553,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"96","issue":"2","noUsgsAuthors":false,"publicationDate":"2006-10-31","publicationStatus":"PW","scienceBaseUri":"505a078fe4b0c8380cd5175f","contributors":{"authors":[{"text":"Mukhi, S.","contributorId":83721,"corporation":false,"usgs":true,"family":"Mukhi","given":"S.","affiliations":[],"preferred":false,"id":424588,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Patino, R.","contributorId":39915,"corporation":false,"usgs":true,"family":"Patino","given":"R.","email":"","affiliations":[],"preferred":false,"id":424587,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70029852,"text":"70029852 - 2007 - Tracking environmental dynamics and agricultural intensification in southern Mali","interactions":[],"lastModifiedDate":"2017-04-14T13:27:34","indexId":"70029852","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":679,"text":"Agricultural Systems","active":true,"publicationSubtype":{"id":10}},"title":"Tracking environmental dynamics and agricultural intensification in southern Mali","docAbstract":"<p><span>The </span><i>Office de la Haute Vallée du Fleuve Niger</i><span> (OHVN) zone in southern Mali is a small but important agricultural production region. Against a background of environmental degradation including decades of declining rainfall, soil erosion, and human pressure on forest resources, numerous farming communities stand out through the use of improved soil and water management practices that have improved agricultural and environmental conditions. Field surveys conducted in 1998–2001 indicated that environmental and agricultural conditions have improved in the past decade. In an effort to better quantify environmental trends, we conducted a study using medium- and high-resolution remotely sensed images from 1965 to 2001 in order to analyze land use and land cover trends in 21 village territories. The trends show clear indications of agricultural intensification and diversification among villages that have received assistance from the OHVN agricultural development agency. Some communities have improved environmental conditions by protecting their forest resources through community management actions. Four decades of remotely sensed images played a practical role in tracking and quantifying environmental and agricultural conditions over time.</span></p>","language":"English","publisher":"Elsevier","doi":"10.1016/j.agsy.2005.07.011","issn":"0308521X","usgsCitation":"Tappan, G., and McGahuey, M., 2007, Tracking environmental dynamics and agricultural intensification in southern Mali: Agricultural Systems, v. 94, no. 1, p. 38-51, https://doi.org/10.1016/j.agsy.2005.07.011.","productDescription":"14 p.","startPage":"38","endPage":"51","numberOfPages":"14","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"links":[{"id":240552,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212977,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.agsy.2005.07.011"}],"volume":"94","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb6a0e4b08c986b326daa","contributors":{"authors":[{"text":"Tappan, G. Gray 0000-0002-2240-6963","orcid":"https://orcid.org/0000-0002-2240-6963","contributorId":147662,"corporation":false,"usgs":true,"family":"Tappan","given":"G. Gray","affiliations":[],"preferred":false,"id":424586,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"McGahuey, M.","contributorId":18580,"corporation":false,"usgs":true,"family":"McGahuey","given":"M.","affiliations":[],"preferred":false,"id":424585,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70029850,"text":"70029850 - 2007 - The rate and pattern of bed incision and bank adjustment on the Colorado River in Glen Canyon downstream from Glen Canyon Dam, 1956-2000","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029850","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1786,"text":"Geological Society of America Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"The rate and pattern of bed incision and bank adjustment on the Colorado River in Glen Canyon downstream from Glen Canyon Dam, 1956-2000","docAbstract":"Closure of Glen Canyon Dam in 1963 transformed the Colorado River by reducing the magnitude and duration of spring floods, increasing the magnitude of base flows, and trapping fine sediment delivered from the upper watershed. These changes caused the channel downstream in Glen Canyon to incise, armor, and narrow. This study synthesizes over 45 yr of channel-change measurements and demonstrates that the rate and style of channel adjustment are directly related to both natural processes associated with sediment deficit and human decisions about dam operations. Although bed lowering in lower Glen Canyon began when the first cofferdam was installed in 1959, most incision occurred in 1965 in conjunction with 14 pulsed high flows that scoured an average of 2.6 m of sediment from the center of the channel. The average grain size of bed material has increased from 0.25 mm in 1956 to over 20 mm in 1999. The magnitude of incision at riffles decreases with distance downstream from the dam, while the magnitude of sediment evacuation from pools is spatially variable and extends farther downstream. Analysis of bed-material mobility indicates that the increase in bed-material grain size and reduction in reach-average gradient are consistent with the transformation of an adjustable-bed alluvial river to a channel with a stable bed that is rarely mobilized. Decreased magnitude of peak discharges in the post-dam regime coupled with channel incision and the associated downward shifts of stage-discharge relations have caused sandbar and terrace erosion and the transformation of previously active sandbars and gravel bars to abandoned deposits that are no longer inundated. Erosion has been concentrated in a few pre-dam terraces that eroded rapidly for brief periods and have since stabilized. The abundance of abandoned deposits decreases downstream in conjunction with decreasing magnitude of shift in the stage-discharge relations. In the downstream part of the study area where riffles controlling channel elevation have not incised, channel narrowing has resulted from decreased magnitude of peak discharges and minor post-dam deposition. These physical changes to the aquatic and riparian systems have supported the establishment and success of an artifact ecosystem dominated by non-native species. Models for the channel response downstream from large dams typically consider factors such as the degree of sediment deficit, the pre-dam surface and subsurface grain size, and the magnitude of post-dam average flows. These results suggest that it is also necessary to consider (1) the possibility of variable responses among different channel elements and (2) the potential importance of exceptional flows resulting from management decisions. ?? 2007 Geological Society of America.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geological Society of America Bulletin","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1130/B25969.1","issn":"00167606","usgsCitation":"Grams, P., Schmidt, J.C., and Topping, D., 2007, The rate and pattern of bed incision and bank adjustment on the Colorado River in Glen Canyon downstream from Glen Canyon Dam, 1956-2000: Geological Society of America Bulletin, v. 119, no. 5-6, p. 556-575, https://doi.org/10.1130/B25969.1.","startPage":"556","endPage":"575","numberOfPages":"20","costCenters":[],"links":[{"id":212950,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1130/B25969.1"},{"id":240520,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"119","issue":"5-6","noUsgsAuthors":false,"publicationDate":"2007-05-08","publicationStatus":"PW","scienceBaseUri":"505baef2e4b08c986b32443f","contributors":{"authors":[{"text":"Grams, P.E.","contributorId":64032,"corporation":false,"usgs":true,"family":"Grams","given":"P.E.","email":"","affiliations":[],"preferred":false,"id":424582,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schmidt, J. C.","contributorId":60245,"corporation":false,"usgs":true,"family":"Schmidt","given":"J.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":424581,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Topping, D.J. 0000-0002-2104-4577","orcid":"https://orcid.org/0000-0002-2104-4577","contributorId":53927,"corporation":false,"usgs":true,"family":"Topping","given":"D.J.","affiliations":[],"preferred":false,"id":424580,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70029848,"text":"70029848 - 2007 - Characterizing dissolved Cu and Cd uptake in terms of the biotic ligand and biodynamics using enriched stable isotopes","interactions":[],"lastModifiedDate":"2023-08-24T11:24:28.963119","indexId":"70029848","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1565,"text":"Environmental Science & Technology","onlineIssn":"1520-5851","printIssn":"0013-936X","active":true,"publicationSubtype":{"id":10}},"title":"Characterizing dissolved Cu and Cd uptake in terms of the biotic ligand and biodynamics using enriched stable isotopes","docAbstract":"<div id=\"abstractBox\" class=\"article_abstract-content hlFld-Abstract\"><p class=\"articleBody_abstractText\">The biotic ligand model considers the biological and geochemical complexities that affect metal exposure. It relates toxicity to the fraction of physiological active sites impacted by reactive metal species. The biodynamic model is a complementary construct that predicts bioaccumulation and assumes that toxicity occurs when influx rates exceed rates of loss and detoxification. In this paper we presume that metal influx rates are mechanistically the resulting processes that characterize transmembrane transport. We use enriched stable isotopes to characterize, both in terms of the biotic ligand and biodynamics, dissolved metal uptake by a freshwater snail at water hardness varying up to 180-fold. Upon 24 h exposure, metal uptake was linear over a range encompassing most environmental concentrations; although saturation kinetics were observed at higher concentrations. Cadmium influx rates correlate with changes in the affinity of the biotic ligand, whereas those of Cu correlate with changes in both site affinity and capacity. A relationship between metal influx rate and ligand character asks whether toxicity is the result of accumulation at the biotic ligand or the rate at which metal is transported by that ligand.</p></div>","language":"English","publisher":"American Chemical Society","doi":"10.1021/es0615122","issn":"0013936X","usgsCitation":"Croteau, M.N., and Luoma, S.N., 2007, Characterizing dissolved Cu and Cd uptake in terms of the biotic ligand and biodynamics using enriched stable isotopes: Environmental Science & Technology, v. 41, no. 9, p. 3140-3145, https://doi.org/10.1021/es0615122.","productDescription":"6 p.","startPage":"3140","endPage":"3145","numberOfPages":"6","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":240488,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"41","issue":"9","noUsgsAuthors":false,"publicationDate":"2007-03-20","publicationStatus":"PW","scienceBaseUri":"5059f4fde4b0c8380cd4c009","contributors":{"authors":[{"text":"Croteau, Marie Noele 0000-0003-0346-3580 mcroteau@usgs.gov","orcid":"https://orcid.org/0000-0003-0346-3580","contributorId":895,"corporation":false,"usgs":true,"family":"Croteau","given":"Marie","email":"mcroteau@usgs.gov","middleInitial":"Noele","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":true,"id":424574,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Luoma, Samuel N. 0000-0001-5443-5091 snluoma@usgs.gov","orcid":"https://orcid.org/0000-0001-5443-5091","contributorId":2287,"corporation":false,"usgs":true,"family":"Luoma","given":"Samuel","email":"snluoma@usgs.gov","middleInitial":"N.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":424575,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70029844,"text":"70029844 - 2007 - Liquefaction, ground oscillation, and soil deformation at the Wildlife Array, California","interactions":[],"lastModifiedDate":"2023-08-07T11:14:55.890719","indexId":"70029844","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","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":"Liquefaction, ground oscillation, and soil deformation at the Wildlife Array, California","docAbstract":"<div id=\"12173050\" class=\"article-section-wrapper js-article-section js-content-section  \" data-section-parent-id=\"0\"><p>Excess pore-water pressure and liquefaction at the Wildlife Liquefaction Array in 1987 were caused by deformation associated with both high-frequency strong ground motion and 5.5-second-period Love waves. The Love waves produced large (∼1.5%) cyclic shear strains well after the stronger high-frequency ground motion abated. These cyclic strains generated approximately from 13 to 35% of the excess pore-water pressure in the liquefied layer and caused excess pore-water pressures ultimately to reach effective overburden stress. The deformation associated with the Love waves explains the “postearthquake” increase of pore-water pressure that was recorded at the array. This explanation suggests that conventional methods for predicting liquefaction based on peak ground acceleration are incomplete and may need to consider cyclic strains associated with long-period surface waves. A postearthquake survey of an inclinometer casing indicated permanent shear strain associated with lateral spreading primarily occurred in the upper part of the liquefied layer. Comparison of cone penetration test soundings conducted after the earthquake with pre-earthquake soundings suggests sleeve friction increased. Natural lateral variability of the liquefied layer obscured changes in tip resistance despite a ∼1% reduction in volume. The large oscillatory motion associated with surface waves explains ground oscillation that has been reported at some liquefaction sites during earthquakes.</p></div>","language":"English","publisher":"Seismological Society of America","doi":"10.1785/0120060156","issn":"00371106","usgsCitation":"Holzer, T., and Youd, T., 2007, Liquefaction, ground oscillation, and soil deformation at the Wildlife Array, California: Bulletin of the Seismological Society of America, v. 97, no. 3, p. 961-976, https://doi.org/10.1785/0120060156.","productDescription":"16 p.","startPage":"961","endPage":"976","numberOfPages":"16","costCenters":[],"links":[{"id":240422,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"coordinates\": [\n          [\n            [\n              -116.05862843886946,\n              33.52719916229543\n            ],\n            [\n              -116.05862843886946,\n              32.49584421830721\n            ],\n            [\n              -114.52120213842458,\n              32.49584421830721\n            ],\n            [\n              -114.52120213842458,\n              33.52719916229543\n            ],\n            [\n              -116.05862843886946,\n              33.52719916229543\n            ]\n          ]\n        ],\n        \"type\": \"Polygon\"\n      }\n    }\n  ]\n}","volume":"97","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a47f6e4b0c8380cd67afe","contributors":{"authors":[{"text":"Holzer, T.L.","contributorId":35739,"corporation":false,"usgs":true,"family":"Holzer","given":"T.L.","email":"","affiliations":[],"preferred":false,"id":424563,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Youd, T. L.","contributorId":73593,"corporation":false,"usgs":true,"family":"Youd","given":"T. L.","affiliations":[],"preferred":false,"id":424564,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70029840,"text":"70029840 - 2007 - Temporal changes in surface-water insecticide concentrations after the phaseout of diazinon and chlorpyrifos","interactions":[],"lastModifiedDate":"2020-09-10T16:36:03.870789","indexId":"70029840","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1565,"text":"Environmental Science & Technology","onlineIssn":"1520-5851","printIssn":"0013-936X","active":true,"publicationSubtype":{"id":10}},"title":"Temporal changes in surface-water insecticide concentrations after the phaseout of diazinon and chlorpyrifos","docAbstract":"<p><span>The recent (late 2001) federally mandated phaseout of diazinon and chlorpyrifos insecticide use in outdoor urban settings has resulted in a rapid decline in concentrations of these insecticides in urban streams and rivers in the northeastern and midwestern United States. Assessment of temporal insecticide trends at 20 sites showed that significant step decreases in diazinon concentrations occurred at 90% of the sites after the phaseout, with concentrations generally decreasing by over 50% in summer samples. Chlorpyrifos concentrations showed significant step decreases in at least 1 season at 3 of the 4 sites with sufficient data for analysis. The decrease in diazinon concentrations in response to the phaseout resulted in a decline in the frequency of concentrations exceeding the acute invertebrate water-quality benchmark of 0.1 μg/L from 10% of pre-phaseout summer samples to fewer than 1% of post-phaseout summer samples. Although some studies have indicated an increase in concentrations of carbaryl in response to the organophosphorous phaseout, carbaryl concentrations only increased at 1 site after the phaseout. A full assessment of the effect of the phaseout of diazinon and chlorpyrifos on surface water will require data on other insecticides used to replace these compounds.</span></p>","language":"English","publisher":"ACS Publications","doi":"10.1021/es070301","usgsCitation":"Phillips, P.J., Ator, S., and Nystrom, E., 2007, Temporal changes in surface-water insecticide concentrations after the phaseout of diazinon and chlorpyrifos: Environmental Science & Technology, v. 41, no. 12, p. 4246-4251, https://doi.org/10.1021/es070301.","productDescription":"6 p.","startPage":"4246","endPage":"4251","numberOfPages":"6","costCenters":[],"links":[{"id":240351,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"41","issue":"12","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505ba503e4b08c986b320742","contributors":{"authors":[{"text":"Phillips, P. J.","contributorId":31728,"corporation":false,"usgs":true,"family":"Phillips","given":"P.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":424546,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Ator, S.W. 0000-0002-9186-4837","orcid":"https://orcid.org/0000-0002-9186-4837","contributorId":104100,"corporation":false,"usgs":true,"family":"Ator","given":"S.W.","affiliations":[],"preferred":false,"id":424548,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Nystrom, E.A.","contributorId":85749,"corporation":false,"usgs":true,"family":"Nystrom","given":"E.A.","email":"","affiliations":[],"preferred":false,"id":424547,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70029839,"text":"70029839 - 2007 - Larval exposure to 4-nonylphenol and 17β-estradiol affects physiological and behavioral development of seawater adaptation in Atlantic salmon smolts","interactions":[],"lastModifiedDate":"2015-04-06T11:10:52","indexId":"70029839","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1565,"text":"Environmental Science & Technology","onlineIssn":"1520-5851","printIssn":"0013-936X","active":true,"publicationSubtype":{"id":10}},"title":"Larval exposure to 4-nonylphenol and 17β-estradiol affects physiological and behavioral development of seawater adaptation in Atlantic salmon smolts","docAbstract":"<p><span>Population declines of anadromous salmonids are attributed to anthropogenic disturbances including dams, commercial and recreational fisheries, and pollutants, such as estrogenic compounds. Nonylphenol (NP), a xenoestrogen, is widespread in the aquatic environment due to its use in agricultural, industrial, and household products. We exposed Atlantic salmon yolk-sac larvae to waterborne 10 or 100 &mu;g L</span><span>-1</span><span>&nbsp;NP (NP-L or NP-H, respectively), 2 &mu;g L</span><span>-1</span><span>&nbsp;17&beta;-estradiol (E</span><span>2</span><span>), or vehicle, for 21 days to investigate their effects on smolt physiology and behavior 1 year later. NP-H caused approximately 50% mortality during exposure, 30 days after exposure, and 60 days after exposure. Mortality rates of NP-L and E</span><span>2</span><span>&nbsp;fish were not affected until 60 days after treatment, when they were 4-fold greater than those of controls. Treatment with NP-L or E</span><span>2</span><span>&nbsp;as yolk-sac larvae decreased gill sodium-potassium-activated adenosine triphosphatase (Na</span><span>+</span><span>,K</span><span>+</span><span>-ATPase) activity and seawater (SW) tolerance during smolt development, 1 year after exposure. Exposure to NP-L and E</span><span>2</span><span>&nbsp;resulted in a latency to enter SW and reduced preference for SW approximately 2- and 5-fold, respectively. NP-L-exposed fish had 20% lower plasma insulin-like growth factor I (IGF-I) levels and 35% lower plasma triiodothyronine (T</span><span>3</span><span>). Plasma growth hormone and thyroxine (T</span><span>4</span><span>) were unaffected. Exposure to E</span><span>2</span><span>&nbsp;did not affect plasma levels of IGF-I, GH, T</span><span>3</span><span>, or T</span><span>4</span><span>. Both treatment groups exhibited increased plasma cortisol and decreased osmoregulatory capacity in response to a handling stressor. These results suggest that early exposure to environmentally relevant concentrations of NP, and other estrogenic compounds, can cause direct and delayed mortalities and that this exposure can have long term, &ldquo;organizational&rdquo; effects on life-history events in salmonids.</span></p>","language":"English","publisher":"ACS Publications","doi":"10.1021/es070202w","issn":"0013936X","usgsCitation":"Lerner, D.T., Bjornsson, B.T., and McCormick, S., 2007, Larval exposure to 4-nonylphenol and 17β-estradiol affects physiological and behavioral development of seawater adaptation in Atlantic salmon smolts: Environmental Science & Technology, v. 41, no. 12, p. 4479-4485, https://doi.org/10.1021/es070202w.","productDescription":"7 p.","startPage":"4479","endPage":"4485","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":240350,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212806,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1021/es070202w"}],"volume":"41","issue":"12","noUsgsAuthors":false,"publicationDate":"2007-05-17","publicationStatus":"PW","scienceBaseUri":"505a44ade4b0c8380cd66cbb","contributors":{"authors":[{"text":"Lerner, Darrren T.","contributorId":51175,"corporation":false,"usgs":true,"family":"Lerner","given":"Darrren","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":424543,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bjornsson, Bjorn Thrandur","contributorId":28928,"corporation":false,"usgs":true,"family":"Bjornsson","given":"Bjorn","email":"","middleInitial":"Thrandur","affiliations":[],"preferred":false,"id":424545,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"McCormick, Stephen D. 0000-0003-0621-6200","orcid":"https://orcid.org/0000-0003-0621-6200","contributorId":84678,"corporation":false,"usgs":true,"family":"McCormick","given":"Stephen D.","affiliations":[],"preferred":false,"id":424544,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70029838,"text":"70029838 - 2007 - Determining metal assimilation efficiency in aquatic invertebrates using enriched stable metal isotope tracers","interactions":[],"lastModifiedDate":"2023-08-03T11:54:24.514896","indexId":"70029838","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":874,"text":"Aquatic Toxicology","active":true,"publicationSubtype":{"id":10}},"title":"Determining metal assimilation efficiency in aquatic invertebrates using enriched stable metal isotope tracers","docAbstract":"<p><span>We employ a novel approach that combines pulse-chase feeding and multi-labelled stable isotopes to determine gut passage time (GPT), gut retention time (GRT), food ingestion rate (IR) and assimilation efficiency (AE) of three trace elements for a freshwater gastropod. Lettuce isotopically enriched in&nbsp;</span><sup>53</sup><span>Cr,&nbsp;</span><sup>65</sup><span>Cu and&nbsp;</span><sup>106</sup><span>Cd was fed for 2</span><span>&nbsp;</span><span>h to&nbsp;</span><i>Lymnaea stagnalis</i><span>. The release of tracers in feces and water was monitored for 48</span><span>&nbsp;</span><span>h, during which unlabelled lettuce was provided&nbsp;</span><i>ad libidum</i><span>. The first defecation of&nbsp;</span><sup>53</sup><span>Cr occurred after 5</span><span>&nbsp;</span><span>h of depuration (GPT), whereas 90% of the ingested&nbsp;</span><sup>53</sup><span>Cr was recovered in the feces after 22.5</span><span>&nbsp;</span><span>h of depuration (GRT).&nbsp;</span><sup>53</sup><span>Chromium was not significantly accumulated in the soft tissues upon exposure. In contrast,&nbsp;</span><sup>65</sup><span>Cu and&nbsp;</span><sup>106</sup><span>Cd assimilation was detectable for most experimental snails, i.e.,&nbsp;</span><sup>65/63</sup><span>Cu and&nbsp;</span><sup>106/114</sup><span>Cd ratios in exposed snails were higher than those for controls. Food IR during the labelled feeding phase was 0.16</span><span>&nbsp;</span><span>±</span><span>&nbsp;</span><span>0.07</span><span>&nbsp;</span><span>g</span><span>&nbsp;</span><span>g</span><sup>−1</sup><span>&nbsp;</span><span>d</span><sup>−1</sup><span>. IR was inferred from the amount of&nbsp;</span><sup>53</sup><span>Cr egested in the feces during depuration and the concentration of&nbsp;</span><sup>53</sup><span>Cr in the labelled lettuce. Assimilation efficiencies (±95% CI) determined using mass balance calculations were 84</span><span>&nbsp;</span><span>±</span><span>&nbsp;</span><span>4% for Cu and 85</span><span>&nbsp;</span><span>±</span><span>&nbsp;</span><span>3% for Cd. The ratio method yields similar AE estimates. Expanding the application of this novel stable isotope tracer technique to other metals in a wide variety of species will provide unique opportunities to evaluate the interplay between digestive processes and dietary influx of metals. Understanding the biological processes that modulate dietborne metal uptake is crucial to assess the toxicity of dietborne metals.</span></p>","language":"English","publisher":"Elsevier","doi":"10.1016/j.aquatox.2007.03.016","issn":"0166445X","usgsCitation":"Croteau, M.N., Luoma, S.N., and Pellet, B., 2007, Determining metal assimilation efficiency in aquatic invertebrates using enriched stable metal isotope tracers: Aquatic Toxicology, v. 83, no. 2, p. 116-125, https://doi.org/10.1016/j.aquatox.2007.03.016.","productDescription":"10 p.","startPage":"116","endPage":"125","numberOfPages":"10","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":240315,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"83","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059fff0e4b0c8380cd4f4b2","contributors":{"authors":[{"text":"Croteau, Marie Noele 0000-0003-0346-3580 mcroteau@usgs.gov","orcid":"https://orcid.org/0000-0003-0346-3580","contributorId":895,"corporation":false,"usgs":true,"family":"Croteau","given":"Marie","email":"mcroteau@usgs.gov","middleInitial":"Noele","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":424540,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Luoma, Samuel N. 0000-0001-5443-5091 snluoma@usgs.gov","orcid":"https://orcid.org/0000-0001-5443-5091","contributorId":2287,"corporation":false,"usgs":true,"family":"Luoma","given":"Samuel","email":"snluoma@usgs.gov","middleInitial":"N.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":424541,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Pellet, B.","contributorId":99377,"corporation":false,"usgs":true,"family":"Pellet","given":"B.","email":"","affiliations":[],"preferred":false,"id":424542,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70029837,"text":"70029837 - 2007 - Geoelectrical evidence of bicontinuum transport in groundwater","interactions":[],"lastModifiedDate":"2019-10-18T06:43:32","indexId":"70029837","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1807,"text":"Geophysical Research Letters","active":true,"publicationSubtype":{"id":10}},"title":"Geoelectrical evidence of bicontinuum transport in groundwater","docAbstract":"<p>Bicontinuum models and rate-limited mass transfer (RLMT) explain complex transport behavior (e.g., long tailing and rebound) in heterogeneous geologic media, but experimental verification is problematic because geochemical samples represent the mobile component of the pore space. Here, we present geophysical evidence of RLMT at the field scale during an aquifer-storage and recovery experiment in a fractured limestone aquifer in Charleston, South Carolina. We observe a hysteretic relation between measurements of porefluid conductivity and bulk electrical conductivity; this hysteresis contradicts advective-dispersive transport and the standard petrophysical model relating pore-fluid and bulk conductivity, but can be explained by considering bicontinuum transport models that include first-order RLMT. Using a simple numerical model, we demonstrate that geoelectrical measurements are sensitive to bicontinuum transport and RLMT parameters, which are otherwise difficult to infer from direct, hydrologic measurements.</p>","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2007GL030019","issn":"00948276","usgsCitation":"Singha, K., Day-Lewis, F.D., and Lane, J.W., 2007, Geoelectrical evidence of bicontinuum transport in groundwater: Geophysical Research Letters, v. 34, no. 12, L12401, 5 p., https://doi.org/10.1029/2007GL030019.","productDescription":"L12401, 5 p.","costCenters":[{"id":493,"text":"Office of Ground Water","active":true,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":240314,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"South Carolina","city":"Charleston","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -80.29632568359375,\n              32.54681317351514\n            ],\n            [\n              -79.5794677734375,\n              32.54681317351514\n            ],\n            [\n              -79.5794677734375,\n              33.13065128220441\n            ],\n            [\n              -80.29632568359375,\n              33.13065128220441\n            ],\n            [\n              -80.29632568359375,\n              32.54681317351514\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"34","issue":"12","noUsgsAuthors":false,"publicationDate":"2007-06-23","publicationStatus":"PW","scienceBaseUri":"505a1744e4b0c8380cd5545f","contributors":{"authors":[{"text":"Singha, K.","contributorId":51431,"corporation":false,"usgs":true,"family":"Singha","given":"K.","affiliations":[],"preferred":false,"id":424539,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Day-Lewis, Frederick D. 0000-0003-3526-886X daylewis@usgs.gov","orcid":"https://orcid.org/0000-0003-3526-886X","contributorId":1672,"corporation":false,"usgs":true,"family":"Day-Lewis","given":"Frederick","email":"daylewis@usgs.gov","middleInitial":"D.","affiliations":[{"id":493,"text":"Office of Ground Water","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":486,"text":"OGW Branch of Geophysics","active":true,"usgs":true}],"preferred":true,"id":424538,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Lane, John W. Jr. 0000-0002-3558-243X jwlane@usgs.gov","orcid":"https://orcid.org/0000-0002-3558-243X","contributorId":189168,"corporation":false,"usgs":true,"family":"Lane","given":"John","suffix":"Jr.","email":"jwlane@usgs.gov","middleInitial":"W.","affiliations":[{"id":486,"text":"OGW Branch of Geophysics","active":true,"usgs":true},{"id":493,"text":"Office of Ground Water","active":true,"usgs":true}],"preferred":false,"id":424537,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70029836,"text":"70029836 - 2007 - Increased groundwater to stream discharge from permafrost thawing in the Yukon River basin: Potential impacts on lateral export of carbon and nitrogen","interactions":[],"lastModifiedDate":"2018-10-17T10:06:39","indexId":"70029836","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1807,"text":"Geophysical Research Letters","active":true,"publicationSubtype":{"id":10}},"title":"Increased groundwater to stream discharge from permafrost thawing in the Yukon River basin: Potential impacts on lateral export of carbon and nitrogen","docAbstract":"Arctic and subarctic watersheds are undergoing climate warming, permafrost thawing, and thermokarst formation resulting in quantitative shifts in surface water - groundwater interaction at the basin scale. Groundwater currently comprises almost one fourth of Yukon River water discharged to the Bering Sea and contributes 5-10% of the dissolved organic carbon (DOC) and nitrogen (DON) and 35-45% of the dissolved inorganic carbon (DIC) and nitrogen (DIN) loads. Long-term strearnflow records (>30 yrs) of the Yukon River basin indicate a general upward trend in groundwater contribution to streamflow of 0.7-0.9%/yr and no pervasive change in annual flow. We propose that the increases in groundwater contributions were caused predominately by climate warming and permafrost thawing that enhances infiltration and supports deeper flowpaths. The increased groundwater fraction may result in decreased DOC and DON and increased DIC and DIN export when annual flow remains unchanged.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geophysical Research Letters","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1029/2007GL030216","issn":"00948276","usgsCitation":"Walvoord, M.A., and Striegl, R.G., 2007, Increased groundwater to stream discharge from permafrost thawing in the Yukon River basin: Potential impacts on lateral export of carbon and nitrogen: Geophysical Research Letters, v. 34, no. 12, https://doi.org/10.1029/2007GL030216.","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":477214,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2007gl030216","text":"Publisher Index Page"},{"id":240313,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212775,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2007GL030216"}],"volume":"34","issue":"12","noUsgsAuthors":false,"publicationDate":"2007-06-28","publicationStatus":"PW","scienceBaseUri":"505a39f9e4b0c8380cd61ae1","contributors":{"authors":[{"text":"Walvoord, Michelle Ann 0000-0003-4269-8366 walvoord@usgs.gov","orcid":"https://orcid.org/0000-0003-4269-8366","contributorId":147211,"corporation":false,"usgs":true,"family":"Walvoord","given":"Michelle","email":"walvoord@usgs.gov","middleInitial":"Ann","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":true,"id":424536,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Striegl, Robert G. 0000-0002-8251-4659 rstriegl@usgs.gov","orcid":"https://orcid.org/0000-0002-8251-4659","contributorId":1630,"corporation":false,"usgs":true,"family":"Striegl","given":"Robert","email":"rstriegl@usgs.gov","middleInitial":"G.","affiliations":[{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":36183,"text":"Hydro-Ecological Interactions Branch","active":true,"usgs":true}],"preferred":false,"id":424535,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70029835,"text":"70029835 - 2007 - Spatial analysis of land use and shallow groundwater vulnerability in the watershed adjacent to Assateague Island National Seashore, Maryland and Virginia, USA","interactions":[],"lastModifiedDate":"2012-03-12T17:21:08","indexId":"70029835","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1539,"text":"Environmental Geology","active":true,"publicationSubtype":{"id":10}},"title":"Spatial analysis of land use and shallow groundwater vulnerability in the watershed adjacent to Assateague Island National Seashore, Maryland and Virginia, USA","docAbstract":"Spatial relations between land use and groundwater quality in the watershed adjacent to Assateague Island National Seashore, Maryland and Virginia, USA were analyzed by the use of two spatial models. One model used a logit analysis and the other was based on geostatistics. The models were developed and compared on the basis of existing concentrations of nitrate as nitrogen in samples from 529 domestic wells. The models were applied to produce spatial probability maps that show areas in the watershed where concentrations of nitrate in groundwater are likely to exceed a predetermined management threshold value. Maps of the watershed generated by logistic regression and probability kriging analysis showing where the probability of nitrate concentrations would exceed 3 mg/L (>0.50) compared favorably. Logistic regression was less dependent on the spatial distribution of sampled wells, and identified an additional high probability area within the watershed that was missed by probability kriging. The spatial probability maps could be used to determine the natural or anthropogenic factors that best explain the occurrence and distribution of elevated concentrations of nitrate (or other constituents) in shallow groundwater. This information can be used by local land-use planners, ecologists, and managers to protect water supplies and identify land-use planning solutions and monitoring programs in vulnerable areas. ?? 2006 Springer-Verlag.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Environmental Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s00254-006-0583-8","issn":"09430105","usgsCitation":"LaMotte, A., and Greene, E., 2007, Spatial analysis of land use and shallow groundwater vulnerability in the watershed adjacent to Assateague Island National Seashore, Maryland and Virginia, USA: Environmental Geology, v. 52, no. 7, p. 1413-1421, https://doi.org/10.1007/s00254-006-0583-8.","startPage":"1413","endPage":"1421","numberOfPages":"9","costCenters":[],"links":[{"id":212744,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s00254-006-0583-8"},{"id":240280,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"52","issue":"7","noUsgsAuthors":false,"publicationDate":"2006-12-06","publicationStatus":"PW","scienceBaseUri":"505b941fe4b08c986b31a89d","contributors":{"authors":[{"text":"LaMotte, A.E.","contributorId":45903,"corporation":false,"usgs":true,"family":"LaMotte","given":"A.E.","email":"","affiliations":[],"preferred":false,"id":424533,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Greene, E.A.","contributorId":75575,"corporation":false,"usgs":true,"family":"Greene","given":"E.A.","email":"","affiliations":[],"preferred":false,"id":424534,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70029833,"text":"70029833 - 2007 - Hydrogeologic controls imposed by mechanical stratigraphy in layered rocks of the Chateauguay River Basin, a U.S.-Canada transborder aquifer","interactions":[],"lastModifiedDate":"2019-11-12T13:19:44","indexId":"70029833","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2314,"text":"Journal of Geophysical Research B: Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"Hydrogeologic controls imposed by mechanical stratigraphy in layered rocks of the Chateauguay River Basin, a U.S.-Canada transborder aquifer","docAbstract":"<p><span class=\"paraNumber\">[1]</span><span>&nbsp;The Ch&acirc;teauguay River Basin delineates a transborder watershed with roughly half of its surface area located in northern New York State and half in southern Qu&eacute;bec Province, Canada. As part of a multidisciplinary study designed to characterize the hydrogeologic properties of this basin, geophysical logs were obtained in 12 wells strategically located to penetrate the four major sedimentary rock formations that constitute the regional aquifers. The layered rocks were classified according to their elastic properties into three primary units: soft sandstone, hard sandstone, and dolostone. Downhole measurements were analyzed to identify fracture patterns associated with each unit and to evaluate their role in controlling groundwater flow. Fracture networks are composed of orthogonal sets of laterally extensive, subhorizontal bedding plane partings and bed-delimited, subvertical joints with spacings that are consistent with rock mechanics principles and stress models. The vertical distribution of transmissive zones is confined to a few select bedding plane fractures, with soft sandstone having the fewest (one per 70-m depth) and hard sandstone the most (five per 70-m depth). Bed-normal permeability is examined using a probabilistic model that considers the lengths of flow paths winding along joints and bedding plane fractures. Soft sandstone has the smallest bed-normal permeability primarily because of its wide, geomechanically undersaturated joint spacing. Results indicate that the three formations have similar values of bulk transmissivity, within roughly an order of magnitude, but that each rock unit has its own unique system of groundwater flow paths that constitute that transmissivity.</span></p>","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2006JB004485","issn":"01480227","usgsCitation":"Morin, R.H., Godin, R., Nastev, M., and Rouleau, A., 2007, Hydrogeologic controls imposed by mechanical stratigraphy in layered rocks of the Chateauguay River Basin, a U.S.-Canada transborder aquifer: Journal of Geophysical Research B: Solid Earth, v. 112, no. 4, B04403, 12 p., https://doi.org/10.1029/2006JB004485.","productDescription":"B04403, 12 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":240244,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Canada, United States","otherGeospatial":"Chateauguay River Basin","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -75.146484375,\n              44.75453548416007\n            ],\n            [\n              -73.355712890625,\n              44.75453548416007\n            ],\n            [\n              -73.355712890625,\n              45.706179285330855\n            ],\n            [\n              -75.146484375,\n              45.706179285330855\n            ],\n            [\n              -75.146484375,\n              44.75453548416007\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"112","issue":"4","noUsgsAuthors":false,"publicationDate":"2007-04-06","publicationStatus":"PW","scienceBaseUri":"505a33a2e4b0c8380cd5f132","contributors":{"authors":[{"text":"Morin, Roger H. rhmorin@usgs.gov","contributorId":2432,"corporation":false,"usgs":true,"family":"Morin","given":"Roger","email":"rhmorin@usgs.gov","middleInitial":"H.","affiliations":[],"preferred":true,"id":424526,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Godin, Rejean","contributorId":19780,"corporation":false,"usgs":true,"family":"Godin","given":"Rejean","email":"","affiliations":[],"preferred":false,"id":424528,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Nastev, Miroslav","contributorId":10621,"corporation":false,"usgs":true,"family":"Nastev","given":"Miroslav","email":"","affiliations":[],"preferred":false,"id":424527,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rouleau, Alain","contributorId":84165,"corporation":false,"usgs":true,"family":"Rouleau","given":"Alain","email":"","affiliations":[],"preferred":false,"id":424529,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70029832,"text":"70029832 - 2007 - Effects of antenna length and material on output power and detection of miniature radio transmitters","interactions":[],"lastModifiedDate":"2012-03-12T17:21:08","indexId":"70029832","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Effects of antenna length and material on output power and detection of miniature radio transmitters","docAbstract":"The optimal antenna of transmitters used in small aquatic animals is often a compromise between efficient radio wave propagation and effects on animal behavior. Radio transmission efficiency generally increases with diameter and length of the conductor, but increased antenna length or weight can adversely affect animal behavior. We evaluated the effects of changing antenna length and material on the subsequent tag output power, reception, and detection of tagged fish. In a laboratory, we compared the relative signal strengths in water of 150 MHz transmitters over a range of antenna lengths (from 6 to 30 cm) and materials (one weighing about half of the other). The peak relative signal strengths were at 20 and 22 cm, which are approximately one wavelength underwater at the test frequency. The peak relative signal strengths at these lengths were approximately 50% greater than those of 30 cm antennas, a length commonly used in fisheries research. Few significant differences were present in distances for the operator to hear or the telemetry receiver to decode transmitters from a boat-mounted receiving system based on antenna length, but the percent of tagged fish detected passing a hydroelectric dam fitted with an array of receiving systems was significantly greater at the antenna length with peak output power in laboratory tests. This study indicates careful choice of antenna length and material of small transmitters can be used to reduce weight and possible antenna effects on animal behavior, to maximize tag output power and detection, or to balance these factors based on the needs of the application. ?? 2007 Springer Science+Business Media B.V.","largerWorkTitle":"Hydrobiologia","language":"English","doi":"10.1007/s10750-006-0543-z","issn":"00188158","usgsCitation":"Beeman, J., Bower, N., Juhnke, S., Dingmon, L., Van Den, T.M., and Thomas, T., 2007, Effects of antenna length and material on output power and detection of miniature radio transmitters, <i>in</i> Hydrobiologia, v. 582, no. 1, p. 221-229, https://doi.org/10.1007/s10750-006-0543-z.","startPage":"221","endPage":"229","numberOfPages":"9","costCenters":[],"links":[{"id":212716,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10750-006-0543-z"},{"id":240243,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"582","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a068ce4b0c8380cd512d4","contributors":{"authors":[{"text":"Beeman, J.W.","contributorId":32646,"corporation":false,"usgs":true,"family":"Beeman","given":"J.W.","email":"","affiliations":[],"preferred":false,"id":424521,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bower, N.","contributorId":96089,"corporation":false,"usgs":true,"family":"Bower","given":"N.","email":"","affiliations":[],"preferred":false,"id":424525,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Juhnke, S.","contributorId":56040,"corporation":false,"usgs":true,"family":"Juhnke","given":"S.","email":"","affiliations":[],"preferred":false,"id":424522,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Dingmon, L.","contributorId":65286,"corporation":false,"usgs":true,"family":"Dingmon","given":"L.","email":"","affiliations":[],"preferred":false,"id":424523,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Van Den, Tillaart M. M.","contributorId":79710,"corporation":false,"usgs":true,"family":"Van Den","given":"Tillaart","suffix":"M.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":424524,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Thomas, T.","contributorId":24563,"corporation":false,"usgs":true,"family":"Thomas","given":"T.","email":"","affiliations":[],"preferred":false,"id":424520,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}}
,{"id":70029826,"text":"70029826 - 2007 - Assessment of contamination from arsenical pesticide use on orchards in the great valley region, Virginia and West Virginia, USA","interactions":[],"lastModifiedDate":"2018-11-19T10:26:16","indexId":"70029826","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2262,"text":"Journal of Environmental Quality","active":true,"publicationSubtype":{"id":10}},"title":"Assessment of contamination from arsenical pesticide use on orchards in the great valley region, Virginia and West Virginia, USA","docAbstract":"<p>Lead arsenate pesticides were widely used in apple orchards from 1925 to 1955. Soils from historic orchards in four counties in Virginia and West Virginia contained elevated concentrations of As and Pb, consistent with an arsenical pesticide source. Arsenic concentrations in approximately 50% of the orchard site soils and approximately 1% of reference site soils exceed the USEPA Preliminary Remediation Goal (PRG) screening guideline of 22 mg kg-1 for As in residential soi, defined on the basis of combined chronic exposure risk. Approximately 5% of orchard site soils exceed the USEPA PRG for Pb of 400 mg kg-1 in residential soil; no reference site soils sampled exceed this value. A variety of statistical methods were used to characterize the occurrence, distribution, and dispersion of arsenical pesticide residues in soils, stream sediments, and ground waters relative to landscape features and likely background conditions. Concentrations of Zn, Pb, and Cu were most strongly associated with high developed land density and population density, whereas elevated concentrations of As were weakly correlated with high orchard density, consistent with a pesticide residue source. Arsenic concentrations in ground water wells in the region are generally &lt;0.005 mg L-1. There was no spatial association between As concentrations in ground water and proximity to orchards. Arsenic had limited mobility into ground water from surface soils contaminated with arsenical pesticide residues at concentrations typically found in orchards.</p>","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Environmental Quality","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.2134/jeq2006.0413","issn":"00472425","usgsCitation":"Robinson, G.R., Larkins, P., Boughton, C.J., Reed, B.W., and Sibrell, P.L., 2007, Assessment of contamination from arsenical pesticide use on orchards in the great valley region, Virginia and West Virginia, USA: Journal of Environmental Quality, v. 36, no. 3, p. 654-663, https://doi.org/10.2134/jeq2006.0413.","productDescription":"10 p.","startPage":"654","endPage":"663","costCenters":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":240680,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213091,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.2134/jeq2006.0413"}],"country":"United States","volume":"36","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ee28e4b0c8380cd49bc7","contributors":{"authors":[{"text":"Robinson, Gilpin R. Jr. grobinso@usgs.gov","contributorId":3083,"corporation":false,"usgs":true,"family":"Robinson","given":"Gilpin","suffix":"Jr.","email":"grobinso@usgs.gov","middleInitial":"R.","affiliations":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":false,"id":424491,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Larkins, Peter","contributorId":40691,"corporation":false,"usgs":true,"family":"Larkins","given":"Peter","email":"","affiliations":[],"preferred":false,"id":424493,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Boughton, Carol J.","contributorId":27429,"corporation":false,"usgs":true,"family":"Boughton","given":"Carol","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":424494,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Reed, Bradley W.","contributorId":15300,"corporation":false,"usgs":true,"family":"Reed","given":"Bradley","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":424495,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Sibrell, Philip L. psibrell@usgs.gov","contributorId":2006,"corporation":false,"usgs":true,"family":"Sibrell","given":"Philip","email":"psibrell@usgs.gov","middleInitial":"L.","affiliations":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true}],"preferred":false,"id":424492,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70029825,"text":"70029825 - 2007 - Enhancing water cycle measurements for future hydrologic research","interactions":[],"lastModifiedDate":"2012-03-12T17:21:34","indexId":"70029825","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1112,"text":"Bulletin of the American Meteorological Society","onlineIssn":"1520-0477","printIssn":"0003-0007","active":true,"publicationSubtype":{"id":10}},"title":"Enhancing water cycle measurements for future hydrologic research","docAbstract":"The Consortium of Universities for the Advancement of Hydrologic Sciences, Inc., established the Hydrologic Measurement Facility to transform watershed-scale hydrologic research by facilitating access to advanced instrumentation and expertise that would not otherwise be available to individual investigators. We outline a committee-based process that determined which suites of instrumentation best fit the needs of the hydrological science community and a proposed mechanism for the governance and distribution of these sensors. Here, we also focus on how these proposed suites of instrumentation can be used to address key scientific challenges, including scaling water cycle science in time and space, broadening the scope of individual subdisciplines of water cycle science, and developing mechanistic linkages among these subdisciplines and spatio-temporal scales. ?? 2007 American Meteorological Society.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Bulletin of the American Meteorological Society","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1175/BAMS-88-5-669","issn":"00030007","usgsCitation":"Loescher, H., Jacobs, J., Wendroth, O., Robinson, D., Poulos, G., McGuire, K., Reed, P., Mohanty, B., Shanley, J.B., and Krajewski, W., 2007, Enhancing water cycle measurements for future hydrologic research: Bulletin of the American Meteorological Society, v. 88, no. 5, p. 669-676, https://doi.org/10.1175/BAMS-88-5-669.","startPage":"669","endPage":"676","numberOfPages":"8","costCenters":[],"links":[{"id":477247,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1175/bams-88-5-669","text":"Publisher Index Page"},{"id":213090,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1175/BAMS-88-5-669"},{"id":240679,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"88","issue":"5","noUsgsAuthors":false,"publicationDate":"2007-05-01","publicationStatus":"PW","scienceBaseUri":"505a0979e4b0c8380cd51f24","contributors":{"authors":[{"text":"Loescher, H.W.","contributorId":68966,"corporation":false,"usgs":true,"family":"Loescher","given":"H.W.","affiliations":[],"preferred":false,"id":424487,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Jacobs, J.M.","contributorId":10446,"corporation":false,"usgs":true,"family":"Jacobs","given":"J.M.","email":"","affiliations":[],"preferred":false,"id":424481,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wendroth, O.","contributorId":82533,"corporation":false,"usgs":true,"family":"Wendroth","given":"O.","email":"","affiliations":[],"preferred":false,"id":424489,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Robinson, D.A.","contributorId":64895,"corporation":false,"usgs":true,"family":"Robinson","given":"D.A.","email":"","affiliations":[],"preferred":false,"id":424486,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Poulos, G.S.","contributorId":104712,"corporation":false,"usgs":true,"family":"Poulos","given":"G.S.","email":"","affiliations":[],"preferred":false,"id":424490,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"McGuire, K.","contributorId":63219,"corporation":false,"usgs":true,"family":"McGuire","given":"K.","email":"","affiliations":[],"preferred":false,"id":424485,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Reed, P.","contributorId":19316,"corporation":false,"usgs":true,"family":"Reed","given":"P.","email":"","affiliations":[],"preferred":false,"id":424482,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Mohanty, B.P.","contributorId":20162,"corporation":false,"usgs":true,"family":"Mohanty","given":"B.P.","email":"","affiliations":[],"preferred":false,"id":424483,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Shanley, J. B.","contributorId":52226,"corporation":false,"usgs":true,"family":"Shanley","given":"J.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":424484,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Krajewski, W.","contributorId":78921,"corporation":false,"usgs":true,"family":"Krajewski","given":"W.","email":"","affiliations":[],"preferred":false,"id":424488,"contributorType":{"id":1,"text":"Authors"},"rank":10}]}}
,{"id":70029821,"text":"70029821 - 2007 - Freshwater-saltwater transition zone movement during aquifer storage and recovery cycles in Brooklyn and Queens, New York City, USA","interactions":[],"lastModifiedDate":"2018-10-17T10:50:13","indexId":"70029821","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2342,"text":"Journal of Hydrology","active":true,"publicationSubtype":{"id":10}},"title":"Freshwater-saltwater transition zone movement during aquifer storage and recovery cycles in Brooklyn and Queens, New York City, USA","docAbstract":"<p>Freshwater storage in deep aquifers of Brooklyn and Queens, New York, USA, is under consideration as an emergency water supply for New York City. The purpose of a New York City storage and recovery system is to provide an emergency water supply during times of drought or other contingencies and would entail longer-term storage phases than a typical annual cycle. There is concern amongst neighboring coastal communities that such a system would adversely impact their local water supplies via increased saltwater intrusion. This analysis uses three-dimensional modeling of variable-density ground-water flow and salt transport to study conditions under which hypothetical aquifer storage and recovery (ASR) may not adversely impact the coastal water supplies. A range of storage, pause, and recovery phase lengths and ASR cycle repetitions were used to test scenarios that emphasize control of potential saltwater intrusion. The USGS SUTRA code was used to simulate movement of the freshwater-saltwater transition zones in a detailed model of the upper glacial, Jameco, Magothy, and Lloyd aquifers of western Long Island, New York. Simulated transition zones in the upper glacial, Jameco, and Magothy aquifers reach a steady state for 1999 stress and recharge conditions within 1 ka; however, saltwater encroachment is ongoing in the Lloyd (deepest) aquifer, for which the effects of the rise in sea level since deglaciation on transition zone equilibration are retarded by many ka due to the thick, overlying Raritan confining unit. Pumping in the 20th century has also caused widening and landward movement of the Lloyd aquifer transition zone. Simulation of scenarios of freshwater storage by injection followed by phases of pause and recovery by extraction indicates that the effect of net storage when less water is recovered than injected is to set up a hydraulic saltwater intrusion barrier in the Lloyd aquifer which may have beneficial effects to coastal water users.</p>","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Hydrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier","doi":"10.1016/j.jhydrol.2007.01.035","issn":"00221694","usgsCitation":"Misut, P.E., and Voss, C.I., 2007, Freshwater-saltwater transition zone movement during aquifer storage and recovery cycles in Brooklyn and Queens, New York City, USA: Journal of Hydrology, v. 337, no. 1-2, p. 87-103, https://doi.org/10.1016/j.jhydrol.2007.01.035.","productDescription":"17 p.","startPage":"87","endPage":"103","numberOfPages":"17","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":240615,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213035,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jhydrol.2007.01.035"}],"country":"United States","state":"New York","city":"Brooklyn, Queens","volume":"337","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a13ebe4b0c8380cd54819","contributors":{"authors":[{"text":"Misut, Paul E. 0000-0002-6502-5255 pemisut@usgs.gov","orcid":"https://orcid.org/0000-0002-6502-5255","contributorId":1073,"corporation":false,"usgs":true,"family":"Misut","given":"Paul","email":"pemisut@usgs.gov","middleInitial":"E.","affiliations":[{"id":474,"text":"New York Water Science Center","active":true,"usgs":true}],"preferred":true,"id":424467,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Voss, Clifford I. 0000-0001-5923-2752 cvoss@usgs.gov","orcid":"https://orcid.org/0000-0001-5923-2752","contributorId":1559,"corporation":false,"usgs":true,"family":"Voss","given":"Clifford","email":"cvoss@usgs.gov","middleInitial":"I.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":424468,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70029819,"text":"70029819 - 2007 - Oxygen and chlorine isotopic fractionation during perchlorate biodegradation: Laboratory results and implications for forensics and natural attenuation studies","interactions":[],"lastModifiedDate":"2018-10-17T10:33:55","indexId":"70029819","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1565,"text":"Environmental Science & Technology","onlineIssn":"1520-5851","printIssn":"0013-936X","active":true,"publicationSubtype":{"id":10}},"title":"Oxygen and chlorine isotopic fractionation during perchlorate biodegradation: Laboratory results and implications for forensics and natural attenuation studies","docAbstract":"<p><span>Perchlorate is a widespread environmental contaminant having both anthropogenic and natural sources. Stable isotope ratios of O and Cl in a given sample of perchlorate may be used to distinguish its source(s). Isotopic ratios may also be useful for identifying the extent of biodegradation of perchlorate, which is critical for assessing natural attenuation of this contaminant in groundwater. For this approach to be useful, however, the kinetic isotopic fractionations of O and Cl during perchlorate biodegradation must first be determined as a function of environmental variables such as temperature and bacterial species. A laboratory study was performed in which the O and Cl isotope ratios of perchlorate were monitored as a function of degradation by two separate bacterial strains (</span><i>Azospira suillum</i><span>&nbsp;JPLRND and&nbsp;</span><i>Dechlorospirillum</i><span>&nbsp;sp. FBR2) at both 10 °C and 22 °C with acetate as the electron donor. Perchlorate was completely reduced by both strains within 280 h at 22 °C and 615 h at 10 °C. Measured values of isotopic fractionation factors were ε</span><sup>18</sup><span>O = −36.6 to −29.0‰ and ε</span><sup>37</sup><span>Cl = −14.5 to −11.5‰, and these showed no apparent systematic variation with either temperature or bacterial strain. An experiment using&nbsp;</span><sup>18</sup><span>O-enriched water (δ</span><sup>18</sup><span>O = +198‰) gave results indistinguishable from those observed in the isotopically normal water (δ</span><sup>18</sup><span>O = −8.1‰) used in the other experiments, indicating negligible isotope exchange between perchlorate and water during biodegradation. The fractionation factor ratio ε</span><sup>18</sup><span>O/ε</span><sup>37</sup><span>Cl was nearly invariant in all experiments at 2.50 ± 0.04. These data indicate that isotope ratio analysis will be useful for documenting perchlorate biodegradation in soils and groundwater. The establishment of a microbial fractionation factor ratio (ε</span><sup>18</sup><span>O/ε</span><sup>37</sup><span>Cl) also has significant implications for forensic studies.</span></p>","language":"English","publisher":"ACS","doi":"10.1021/es0621849","issn":"0013936X","usgsCitation":"Sturchio, N.C., Bohlke, J.K., Beloso, A.D., Streger, S., Heraty, L.J., and Hatzinger, P., 2007, Oxygen and chlorine isotopic fractionation during perchlorate biodegradation: Laboratory results and implications for forensics and natural attenuation studies: Environmental Science & Technology, v. 41, no. 8, p. 2796-2802, https://doi.org/10.1021/es0621849.","productDescription":"7 p.","startPage":"2796","endPage":"2802","numberOfPages":"7","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":240581,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213002,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1021/es0621849"}],"volume":"41","issue":"8","noUsgsAuthors":false,"publicationDate":"2007-02-28","publicationStatus":"PW","scienceBaseUri":"505a727ce4b0c8380cd76b14","contributors":{"authors":[{"text":"Sturchio, Neil C.","contributorId":88188,"corporation":false,"usgs":true,"family":"Sturchio","given":"Neil","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":424463,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bohlke, John Karl 0000-0001-5693-6455 jkbohlke@usgs.gov","orcid":"https://orcid.org/0000-0001-5693-6455","contributorId":127841,"corporation":false,"usgs":true,"family":"Bohlke","given":"John","email":"jkbohlke@usgs.gov","middleInitial":"Karl","affiliations":[{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":false,"id":424464,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Beloso, Abelardo D. Jr.","contributorId":15016,"corporation":false,"usgs":true,"family":"Beloso","given":"Abelardo","suffix":"Jr.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":424462,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Streger, S.H.","contributorId":6263,"corporation":false,"usgs":true,"family":"Streger","given":"S.H.","email":"","affiliations":[],"preferred":false,"id":424459,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Heraty, Linnea J.","contributorId":192520,"corporation":false,"usgs":false,"family":"Heraty","given":"Linnea","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":424460,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Hatzinger, Paul B.","contributorId":43204,"corporation":false,"usgs":true,"family":"Hatzinger","given":"Paul B.","affiliations":[],"preferred":false,"id":424461,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}}
,{"id":70029818,"text":"70029818 - 2007 - Hydrologic significance of carbon monoxide concentrations in ground water","interactions":[],"lastModifiedDate":"2018-10-16T10:55:13","indexId":"70029818","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1861,"text":"Ground Water","active":true,"publicationSubtype":{"id":10}},"title":"Hydrologic significance of carbon monoxide concentrations in ground water","docAbstract":"<p><span>Dissolved carbon monoxide (CO) is present in ground water produced from a variety of aquifer systems at concentrations ranging from 0.2 to 20 nanomoles per liter (0.0056 to 0.56 μg/L). In two shallow aquifers, one an unconsolidated coastal plain aquifer in Kings Bay, Georgia, and the other a fractured‐bedrock aquifer in West Trenton, New Jersey, long‐term monitoring showed that CO concentrations varied over time by as much as a factor of 10. Field and laboratory evidence suggests that the delivery of dissolved oxygen to the soil zone and underlying aquifers by periodic recharge events stimulates oxic metabolism and produces transiently high CO concentrations. In between recharge events, the aquifers become anoxic and more substrate limited, CO is consumed as a carbon source, and CO concentrations decrease. According to this model, CO concentrations provide a transient record of oxic metabolism affecting ground water systems&nbsp;</span><i>after<span>&nbsp;</span></i><span>dissolved oxygen has been fully consumed. Because the delivery of oxygen affects the fate and transport of natural and anthropogenic contaminants in ground water, CO concentration changes may be useful for identifying predominantly anoxic ground water systems subject to periodic oxic or microaerophilic conditions.</span></p>","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ground Water","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1111/j.1745-6584.2007.00284.x","issn":"0017467X","usgsCitation":"Chapelle, F.H., and Bradley, P.M., 2007, Hydrologic significance of carbon monoxide concentrations in ground water: Ground Water, v. 45, no. 3, p. 272-280, https://doi.org/10.1111/j.1745-6584.2007.00284.x.","productDescription":"9 p.","startPage":"272","endPage":"280","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":240551,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212976,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1111/j.1745-6584.2007.00284.x"}],"volume":"45","issue":"3","noUsgsAuthors":false,"publicationDate":"2007-03-12","publicationStatus":"PW","scienceBaseUri":"505a368ae4b0c8380cd607c7","contributors":{"authors":[{"text":"Chapelle, Francis H. chapelle@usgs.gov","contributorId":1350,"corporation":false,"usgs":true,"family":"Chapelle","given":"Francis","email":"chapelle@usgs.gov","middleInitial":"H.","affiliations":[{"id":559,"text":"South Carolina Water Science Center","active":true,"usgs":true},{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"preferred":true,"id":424458,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bradley, Paul M. 0000-0001-7522-8606 pbradley@usgs.gov","orcid":"https://orcid.org/0000-0001-7522-8606","contributorId":361,"corporation":false,"usgs":true,"family":"Bradley","given":"Paul","email":"pbradley@usgs.gov","middleInitial":"M.","affiliations":[{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"preferred":true,"id":424457,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
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