The objective of this simulation study was to create an age-structured population model for horseshoe crabs (Limulus polyphenols) in the Delaware Bay region using best available estimates of age-specific mortality and recent harvest levels. Density dependence was incorporated using a spatial model relating egg mortality with abundance of spawning females. Combinations of annual female harvest (0, 50, 100, and 200 thousand), timing of female harvest (before or after spawning), and three levels of density-dependent egg mortality were simulated. The probability of the population increasing was high (> 80%) with low and medium egg mortality and harvest less than 200 thousand females per year. Under the high egg mortality case, the probability of the population increasing was < 50% regardless of harvest. Harvest occurring after spawning increased the probability of population growth. The number of eggs available to shorebirds was highest when egg mortality was lowest and female abundance was at its highest levels. Although harvest and egg mortality influenced population growth and food availability to shorebirds, sensitivity and elasticity analyses showed that early-life stage mortality, age 0 mortality in particular, was the most important parameter for population growth. Our modeling results indicate areas where further research is needed and suggest effective management will involve a combination of harvest management and actions to increase early juvenile survival.
","language":"English","publisher":"SpringerLink","doi":"10.1007/BF02700170","usgsCitation":"Sweka, J., Smith, D., and Millard, M.J., 2007, An age-structured population model for horseshoe crabs in the Delaware Bay area to assess harvest and egg availability for shorebirds: Estuaries and Coasts, v. 30, no. 2, p. 277-286, https://doi.org/10.1007/BF02700170.","productDescription":"10 p.","startPage":"277","endPage":"286","costCenters":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true}],"links":[{"id":240245,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Delaware","otherGeospatial":"Delaware Bay","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -75.35522460937499,\n 38.976492485539396\n ],\n [\n -75.2398681640625,\n 38.852542390364235\n ],\n [\n -74.970703125,\n 38.843986129756615\n ],\n [\n -75.0421142578125,\n 39.0831721934762\n ],\n [\n -75.1849365234375,\n 39.18117526158749\n ],\n [\n -75.4156494140625,\n 39.142842478062505\n ],\n [\n -75.35522460937499,\n 38.976492485539396\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"30","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e9e7e4b0c8380cd48502","contributors":{"authors":[{"text":"Sweka, J. A.","contributorId":15015,"corporation":false,"usgs":false,"family":"Sweka","given":"J. A.","affiliations":[],"preferred":false,"id":424647,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, D. R. 0000-0001-6074-9257","orcid":"https://orcid.org/0000-0001-6074-9257","contributorId":44108,"corporation":false,"usgs":true,"family":"Smith","given":"D. R.","affiliations":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true}],"preferred":false,"id":424649,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Millard, M. J.","contributorId":40555,"corporation":false,"usgs":false,"family":"Millard","given":"M.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":424648,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029864,"text":"70029864 - 2007 - Soft-sediment deformation produced by tides in a meizoseismic area, Turnagain Arm, Alaska","interactions":[],"lastModifiedDate":"2012-03-12T17:21:09","indexId":"70029864","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1796,"text":"Geology","active":true,"publicationSubtype":{"id":10}},"title":"Soft-sediment deformation produced by tides in a meizoseismic area, Turnagain Arm, Alaska","docAbstract":"Turnagain Arm is a semidiurnal hypertidal estuary in southeastern Alaska with a recorded tidal range of 9 m. Contorted bedding and flow rolls preserved in tidal sediments within the estuary have previously been interpreted as resulting from the Mw 9.2 Great Alaskan earthquake of 1964. Horizons of flow rolls between undeformed beds in sediments and rock strata have been used to infer ancient earthquakes in other areas. Although many types of soft-sediment deformation structures can be formed by earthquakes, observations of sedimentation on tidal flats in the inner parts of Turnagain Arm in the summers of 2003 and 2004 show that a wide range of soft-sediment deformation structures, similar to those inferred to have been formed by earthquakes, can form in macrotidal estuaries in the absence of seismic shock. During sedimentation rate measurements in 2004, soft-sediment deformation structures were recorded that formed during one day's tide, either in response to overpressurization of tidal flats during rapid tidal drawdown or by shear stress exerted on the bed by the passage of a 1.8 m tidal bore. Structures consisted of How rolls, dish structures, flames, and small dewatering pipes in a bed 17 cm thick. In the future, if the flow rolls in Turnagain Arm were found in isolated outcrops across an area 11 km in length, in an estuary known to have been influenced by large-magnitude earthquakes, would they be interpreted as seismites? These examples show that caution is needed when using horizons of flow rolls to infer paleoseismicity in estuarine deposits because many of the mechanisms (tidal flux, tidal bores, slumping, flooding) that can cause deformation in rapidly deposited, unconsolidated silts and sands, are orders of magnitude more common than great earthquakes. ?? 2007 The Geological Society of America.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1130/G23209A.1","issn":"00917613","usgsCitation":"Greb, S., and Archer, A., 2007, Soft-sediment deformation produced by tides in a meizoseismic area, Turnagain Arm, Alaska: Geology, v. 35, no. 5, p. 435-438, https://doi.org/10.1130/G23209A.1.","startPage":"435","endPage":"438","numberOfPages":"4","costCenters":[],"links":[{"id":212686,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1130/G23209A.1"},{"id":240211,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"35","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b91d7e4b08c986b319b36","contributors":{"authors":[{"text":"Greb, S.F.","contributorId":48294,"corporation":false,"usgs":true,"family":"Greb","given":"S.F.","email":"","affiliations":[],"preferred":false,"id":424646,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Archer, A.W.","contributorId":8620,"corporation":false,"usgs":true,"family":"Archer","given":"A.W.","affiliations":[],"preferred":false,"id":424645,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029863,"text":"70029863 - 2007 - Using geochemistry as a tool for correlating proximal andesitic tephra: Case studies from Mt Rainier (USA) and Mt Ruapehu (New Zealand)","interactions":[],"lastModifiedDate":"2012-03-12T17:21:08","indexId":"70029863","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2437,"text":"Journal of Quaternary Science","active":true,"publicationSubtype":{"id":10}},"title":"Using geochemistry as a tool for correlating proximal andesitic tephra: Case studies from Mt Rainier (USA) and Mt Ruapehu (New Zealand)","docAbstract":"Volcanic hazards assessments at andesite stratovolcanoes rely on the assessment of frequency and magnitude of past events. The identification and correlation of proximal and distal andesitic tephra, which record the explosive eruptive history, are integral to such assessments. These tephra are potentially valuable stratigraphic marker beds useful to the temporal correlation and age dating of Quaternary volcanic, volcaniclastic and epiclastic sedimentary deposits with which they are interbedded. At Mt Ruapehu (New Zealand) and Mt Rainier (USA), much of the detail of the recent volcanic record remains unresolved because of the difficulty in identifying proximal tephra. This study investigates the value of geochemical methods in discriminating andesitic tephra. Our dataset comprises petrological and geochemical analyses of tephra that span the late Quaternary eruptive record of each volcano. Our data illustrate that andesitic tephra are remarkably heterogeneous in composition. Tephra compositions fluctuate widely over short time intervals, and there are no simple or systematic temporal trends in geochemistry within either eruptive record. This complexity in tephra geochemistry limits the application of geochemical approaches to tephrostratigraphic studies, beyond a general characterisation useful to provenance assignation. Petrological and geochemical data suggest that the products of andesite systems are inherently variable and therefore intractable to discrimination by simple geochemical methods alone. Copyright ?? 2006 John Wiley & Sons, Ltd.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Quaternary Science","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1002/jqs.1065","issn":"02678179","usgsCitation":"Donoghue, S., Vallance, J., Smith, I., and Stewart, R., 2007, Using geochemistry as a tool for correlating proximal andesitic tephra: Case studies from Mt Rainier (USA) and Mt Ruapehu (New Zealand): Journal of Quaternary Science, v. 22, no. 4, p. 395-410, https://doi.org/10.1002/jqs.1065.","startPage":"395","endPage":"410","numberOfPages":"16","costCenters":[],"links":[{"id":212685,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1002/jqs.1065"},{"id":240210,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"22","issue":"4","noUsgsAuthors":false,"publicationDate":"2006-12-13","publicationStatus":"PW","scienceBaseUri":"505bc053e4b08c986b32a06d","contributors":{"authors":[{"text":"Donoghue, S.L.","contributorId":83741,"corporation":false,"usgs":true,"family":"Donoghue","given":"S.L.","email":"","affiliations":[],"preferred":false,"id":424644,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Vallance, J.","contributorId":41221,"corporation":false,"usgs":true,"family":"Vallance","given":"J.","email":"","affiliations":[],"preferred":false,"id":424642,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Smith, I.E.M.","contributorId":31983,"corporation":false,"usgs":true,"family":"Smith","given":"I.E.M.","email":"","affiliations":[],"preferred":false,"id":424641,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Stewart, R.B.","contributorId":67289,"corporation":false,"usgs":true,"family":"Stewart","given":"R.B.","email":"","affiliations":[],"preferred":false,"id":424643,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"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":70030119,"text":"70030119 - 2007 - Visible and near-infrared multispectral analysis of rocks at Meridiani Planum, Mars, by the Mars Exploration Rover Opportunity","interactions":[],"lastModifiedDate":"2012-03-12T17:21:08","indexId":"70030119","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2317,"text":"Journal of Geophysical Research E: Planets","active":true,"publicationSubtype":{"id":10}},"title":"Visible and near-infrared multispectral analysis of rocks at Meridiani Planum, Mars, by the Mars Exploration Rover Opportunity","docAbstract":"Multispectral measurements in the visible and near infrared of rocks at Meridiani Planum by the Mars Exploration Rover Opportunity's Pancam are described. The Pancam multispectral data show that the outcrops of the Burns formation consist of two main spectral units which in stretched 673, 535, 432 nm color composites appear buff- and purple-colored. These units are referred to as the HFS and LFS spectral units based on higher and lower values of 482 to 535 nm slope. Spectral characteristics are consistent with the LFS outcrop consisting of less oxidized, and the HFS outcrop consisting of more oxidized, iron-bearing minerals. The LFS surfaces are not as common and appear, primarily, at the distal ends of outcrop layers and on steep, more massive surfaces, locations that are subject to greater eolian erosion. Consequently, the HFS surfaces are interpreted as a weathering rind. Further inherent spectral differences between layer's and between different outcrop map units, both untouched and patches abraded by the rover's Rock Abrasion Tool, are also described. Comparisons of the spectral parameters of the Meridiani outcrop with a set of laboratory reflectance measurements of Fe3+-bearing minerals show that the field of outcrop measurements plots near the fields of hematite, ferrihydrite, poorly crystalline goethite, and schwertmannite. Rind and fracture fill materials, observed intermittently at outcrop exposures, are intermediate in their spectral character between both the HFS and LFS spectral classes and other, less oxidized, surface materials (basaltic sands, spherules, and cobbles). Copyright 2007 by the American Geophysical Union.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Geophysical Research E: Planets","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1029/2006JE002773","issn":"01480227","usgsCitation":"Farrand, W.H., Bell, J., Johnson, J.R., Jolliff, B., Knoll, A., McLennan, S.M., Squyres, S.W., Calvin, W.M., Grotzinger, J., Morris, R., Soderblom, J., Thompson, S., Watters, W., and Yen, A.S., 2007, Visible and near-infrared multispectral analysis of rocks at Meridiani Planum, Mars, by the Mars Exploration Rover Opportunity: Journal of Geophysical Research E: Planets, v. 112, no. 6, https://doi.org/10.1029/2006JE002773.","costCenters":[],"links":[{"id":476980,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2006je002773","text":"Publisher Index Page"},{"id":212992,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2006JE002773"},{"id":240568,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"112","issue":"6","noUsgsAuthors":false,"publicationDate":"2007-04-26","publicationStatus":"PW","scienceBaseUri":"505bc289e4b08c986b32abda","contributors":{"authors":[{"text":"Farrand, W. H.","contributorId":64372,"corporation":false,"usgs":true,"family":"Farrand","given":"W.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":425789,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bell, J.F. III","contributorId":97612,"corporation":false,"usgs":true,"family":"Bell","given":"J.F.","suffix":"III","email":"","affiliations":[],"preferred":false,"id":425795,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Johnson, J. R.","contributorId":69278,"corporation":false,"usgs":true,"family":"Johnson","given":"J.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":425790,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Jolliff, B.L.","contributorId":21268,"corporation":false,"usgs":true,"family":"Jolliff","given":"B.L.","email":"","affiliations":[],"preferred":false,"id":425784,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Knoll, A.H.","contributorId":84885,"corporation":false,"usgs":true,"family":"Knoll","given":"A.H.","email":"","affiliations":[],"preferred":false,"id":425792,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"McLennan, S. M.","contributorId":96733,"corporation":false,"usgs":true,"family":"McLennan","given":"S.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":425794,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Squyres, S. W.","contributorId":31836,"corporation":false,"usgs":true,"family":"Squyres","given":"S.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":425785,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Calvin, W. M.","contributorId":17379,"corporation":false,"usgs":false,"family":"Calvin","given":"W.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":425783,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Grotzinger, J.P.","contributorId":76053,"corporation":false,"usgs":true,"family":"Grotzinger","given":"J.P.","affiliations":[],"preferred":false,"id":425791,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Morris, R.V.","contributorId":6978,"corporation":false,"usgs":true,"family":"Morris","given":"R.V.","affiliations":[],"preferred":false,"id":425782,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Soderblom, J.","contributorId":52699,"corporation":false,"usgs":false,"family":"Soderblom","given":"J.","affiliations":[],"preferred":false,"id":425787,"contributorType":{"id":1,"text":"Authors"},"rank":11},{"text":"Thompson, S.D.","contributorId":63511,"corporation":false,"usgs":true,"family":"Thompson","given":"S.D.","email":"","affiliations":[],"preferred":false,"id":425788,"contributorType":{"id":1,"text":"Authors"},"rank":12},{"text":"Watters, W.A.","contributorId":86542,"corporation":false,"usgs":true,"family":"Watters","given":"W.A.","email":"","affiliations":[],"preferred":false,"id":425793,"contributorType":{"id":1,"text":"Authors"},"rank":13},{"text":"Yen, A. S.","contributorId":35860,"corporation":false,"usgs":true,"family":"Yen","given":"A.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":425786,"contributorType":{"id":1,"text":"Authors"},"rank":14}]}} ,{"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":"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 53Cr, 65Cu and 106Cd was fed for 2 h to Lymnaea stagnalis. The release of tracers in feces and water was monitored for 48 h, during which unlabelled lettuce was provided ad libidum. The first defecation of 53Cr occurred after 5 h of depuration (GPT), whereas 90% of the ingested 53Cr was recovered in the feces after 22.5 h of depuration (GRT). 53Chromium was not significantly accumulated in the soft tissues upon exposure. In contrast, 65Cu and 106Cd assimilation was detectable for most experimental snails, i.e., 65/63Cu and 106/114Cd ratios in exposed snails were higher than those for controls. Food IR during the labelled feeding phase was 0.16 ± 0.07 g g−1 d−1. IR was inferred from the amount of 53Cr egested in the feces during depuration and the concentration of 53Cr in the labelled lettuce. Assimilation efficiencies (±95% CI) determined using mass balance calculations were 84 ± 4% for Cu and 85 ± 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.
","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":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":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":70029859,"text":"70029859 - 2007 - Numerical dating of a Late Quaternary spit-shoreline complex at the northern end of Silver Lake playa, Mojave Desert, California: A comparison of the applicability of radiocarbon, luminescence, terrestrial cosmogenic nuclide, electron spin resonance, U-series and amino acid racemization methods","interactions":[],"lastModifiedDate":"2012-03-12T17:21:35","indexId":"70029859","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3217,"text":"Quaternary International","active":true,"publicationSubtype":{"id":10}},"title":"Numerical dating of a Late Quaternary spit-shoreline complex at the northern end of Silver Lake playa, Mojave Desert, California: A comparison of the applicability of radiocarbon, luminescence, terrestrial cosmogenic nuclide, electron spin resonance, U-series and amino acid racemization methods","docAbstract":"A Late Quaternary spit-shoreline complex on the northern shore of Pleistocene Lake Mojave of southeastern California, USA was studied with the goal of comparing accelerator mass spectrometry (AMS) radiocarbon, luminescence, electron spin resonance (ESR), terrestrial cosmogenic radionuclide (TCN) surface exposure, amino acid racemization (AAR) and U-series dating methods. The pattern of ages obtained by the different methods illustrates the complexity of processes acting in the lakeshore environment and highlights the utility of a multi-method approach. TCN surface exposure ages (mostly ???20-30 ka) record the initial erosion of shoreline benches, whereas radiocarbon ages on shells (determined in this and previous studies) within the spit, supported by AAR data, record its construction at fluctuating lake levels from ???16 to 10 ka. Luminescence ages on spit sediment (???6-7 ka) and ESR ages on spit shells (???4 ka) are anomalously young relative to radiocarbon ages of shells within the same deposits. The significance of the surprisingly young luminescence ages is not clear. The younger ESR ages could be a consequence of post-mortem enrichment of U in the shells. High concentrations of detrital thorium in tufa coating spit gravels inhibited the use of single-sample U-series dating. Detailed comparisons such as this provide one of the few means of assessing the accuracy of Quaternary dating techniques. More such comparisons are needed. ?? 2007 Elsevier Ltd and INQUA.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Quaternary International","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.quaint.2007.01.001","issn":"10406182","usgsCitation":"Owen, L., Bright, J., Finkel, R., Jaiswal, M., Kaufman, D.S., Mahan, S., Radtke, U., Schneider, J., Sharp, W., Singhvi, A., and Warren, C., 2007, Numerical dating of a Late Quaternary spit-shoreline complex at the northern end of Silver Lake playa, Mojave Desert, California: A comparison of the applicability of radiocarbon, luminescence, terrestrial cosmogenic nuclide, electron spin resonance, U-series and amino acid racemization methods: Quaternary International, v. 166, no. 1, p. 87-110, https://doi.org/10.1016/j.quaint.2007.01.001.","startPage":"87","endPage":"110","numberOfPages":"24","costCenters":[],"links":[{"id":213093,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.quaint.2007.01.001"},{"id":240682,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"166","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a68ebe4b0c8380cd73a82","contributors":{"authors":[{"text":"Owen, L.A.","contributorId":94836,"corporation":false,"usgs":true,"family":"Owen","given":"L.A.","email":"","affiliations":[],"preferred":false,"id":424631,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bright, Jordon","contributorId":63981,"corporation":false,"usgs":false,"family":"Bright","given":"Jordon","affiliations":[{"id":7042,"text":"University of Arizona","active":true,"usgs":false}],"preferred":false,"id":424628,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Finkel, R.C.","contributorId":79677,"corporation":false,"usgs":true,"family":"Finkel","given":"R.C.","email":"","affiliations":[],"preferred":false,"id":424630,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Jaiswal, M.K.","contributorId":18183,"corporation":false,"usgs":true,"family":"Jaiswal","given":"M.K.","email":"","affiliations":[],"preferred":false,"id":424624,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Kaufman, D. S.","contributorId":18006,"corporation":false,"usgs":false,"family":"Kaufman","given":"D.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":424623,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Mahan, S.","contributorId":98894,"corporation":false,"usgs":true,"family":"Mahan","given":"S.","email":"","affiliations":[],"preferred":false,"id":424632,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Radtke, U.","contributorId":9003,"corporation":false,"usgs":true,"family":"Radtke","given":"U.","email":"","affiliations":[],"preferred":false,"id":424622,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Schneider, J.S.","contributorId":57271,"corporation":false,"usgs":true,"family":"Schneider","given":"J.S.","email":"","affiliations":[],"preferred":false,"id":424626,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Sharp, W.","contributorId":52402,"corporation":false,"usgs":true,"family":"Sharp","given":"W.","affiliations":[],"preferred":false,"id":424625,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Singhvi, A.K.","contributorId":64435,"corporation":false,"usgs":true,"family":"Singhvi","given":"A.K.","email":"","affiliations":[],"preferred":false,"id":424629,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Warren, C.N.","contributorId":63340,"corporation":false,"usgs":true,"family":"Warren","given":"C.N.","email":"","affiliations":[],"preferred":false,"id":424627,"contributorType":{"id":1,"text":"Authors"},"rank":11}]}} ,{"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":70029956,"text":"70029956 - 2007 - Restoring coastal wetlands that were ditched for mosquito control: a preliminary assessment of hydro-leveling as a restoration technique","interactions":[],"lastModifiedDate":"2014-09-16T15:37:40","indexId":"70029956","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2219,"text":"Journal of Coastal Conservation","active":true,"publicationSubtype":{"id":10}},"title":"Restoring coastal wetlands that were ditched for mosquito control: a preliminary assessment of hydro-leveling as a restoration technique","docAbstract":"The wetlands surrounding Tampa Bay, Florida were extensively ditched for mosquito control in the 1950s. Spoil from ditch construction was placed adjacent to the wetlands ditches creating mound-like features (spoil-mounds). These mounds represent a loss of 14% of the wetland area in Tampa Bay. Spoil mounds interfere with tidal flow and are locations for non-native plants to colonize (e.g., Schinus terebinthifolius). Removal of the spoil mounds to eliminate exotic plants, restore native vegetation, and re-establish natural hydrology is a restoration priority for environmental managers. Hydro-leveling, a new technique, was tested in a mangrove forest restoration project in 2004. Hydro-leveling uses a high pressure stream of water to wash sediment from the spoil mound into the adjacent wetland and ditch. To assess the effectiveness of this technique, we conducted vegetation surveys in areas that were hydro-leveled and in non-hydro-leveled areas 3 years post-project. Adult Schinus were reduced but not eliminated from hydro-leveled mounds. Schinus seedlings however were absent from hydro-leveled sites. Colonization by native species was sparse. Mangrove seedlings were essentially absent (≈2 m−2) from the centers of hydro-leveled mounds and were in low density on their edges (17 m−2) in comparison to surrounding mangrove forests (105 m−2). Hydro-leveling resulted in mortality of mangroves adjacent to the mounds being leveled. This was probably caused by burial of pneumatophores during the hydro-leveling process. For hydro-leveling to be a useful and successful restoration technique several requirements must be met. Spoil mounds must be lowered to the level of the surrounding wetlands. Spoil must be distributed further into the adjacent wetland to prevent burial of nearby native vegetation. Finally, native species may need to be planted on hydro-leveled areas to speed up the re-vegetation process.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Coastal Conservation","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Springer","doi":"10.1007/s11852-007-0007-2","issn":"14000350","usgsCitation":"Smith, T.J., Tiling, G., and Leasure, P.S., 2007, Restoring coastal wetlands that were ditched for mosquito control: a preliminary assessment of hydro-leveling as a restoration technique: Journal of Coastal Conservation, v. 11, no. 1, p. 67-74, https://doi.org/10.1007/s11852-007-0007-2.","productDescription":"8 p.","startPage":"67","endPage":"74","numberOfPages":"8","costCenters":[{"id":186,"text":"Coastal and Marine Geology Program","active":true,"usgs":true}],"links":[{"id":213044,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s11852-007-0007-2"},{"id":240624,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"11","issue":"1","noUsgsAuthors":false,"publicationDate":"2007-09-18","publicationStatus":"PW","scienceBaseUri":"505aaadce4b0c8380cd86586","contributors":{"authors":[{"text":"Smith, Thomas J. III tom_j_smith@usgs.gov","contributorId":1615,"corporation":false,"usgs":true,"family":"Smith","given":"Thomas","suffix":"III","email":"tom_j_smith@usgs.gov","middleInitial":"J.","affiliations":[{"id":566,"text":"Southeast Ecological Science Center","active":true,"usgs":true}],"preferred":false,"id":425059,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Tiling, Ginger","contributorId":82787,"corporation":false,"usgs":true,"family":"Tiling","given":"Ginger","email":"","affiliations":[],"preferred":false,"id":425061,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Leasure, Pamela S.","contributorId":50732,"corporation":false,"usgs":true,"family":"Leasure","given":"Pamela","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":425060,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029958,"text":"70029958 - 2007 - Geomorphic and sedimentologic evidence for the separation of Lake Superior from Lake Michigan and Huron","interactions":[],"lastModifiedDate":"2016-05-02T10:16:08","indexId":"70029958","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2411,"text":"Journal of Paleolimnology","active":true,"publicationSubtype":{"id":10}},"title":"Geomorphic and sedimentologic evidence for the separation of Lake Superior from Lake Michigan and Huron","docAbstract":"A common break was recognized in four Lake Superior strandplain sequences using geomorphic and sedimentologic characteristics. Strandplains were divided into lakeward and landward sets of beach ridges using aerial photographs and topographic surveys to identify similar surficial features and core data to identify similar subsurface features. Cross-strandplain, elevation-trend changes from a lowering towards the lake in the landward set of beach ridges to a rise or reduction of slope towards the lake in the lakeward set of beach ridges indicates that the break is associated with an outlet change for Lake Superior. Correlation of this break between study sites and age model results for the strandplain sequences suggest that the outlet change occurred sometime after about 2,400 calendar years ago (after the Algoma phase). Age model results from one site (Grand Traverse Bay) suggest an alternate age closer to about 1,200 calendar years ago but age models need to be investigated further. The landward part of the strandplain was deposited when water levels were common in all three upper Great Lakes basins (Superior, Huron, and Michigan) and drained through the Port Huron/Sarnia outlet. The lakeward part was deposited after the Sault outlet started to help regulate water levels in the Lake Superior basin. The landward beach ridges are commonly better defined and continuous across the embayments, more numerous, larger in relief, wider, have greater vegetation density, and intervening swales contain more standing water and peat than the lakeward set. Changes in drainage patterns, foreshore sediment thickness and grain size help in identifying the break between sets in the strandplain sequences. Investigation of these breaks may help identify possible gaps in the record or missing ridges in strandplain sequences that may not be apparent when viewing age distributions and may justify the need for multiple age and glacial isostatic adjustment models. ?? 2006 Springer Science+Business Media B.V.
","language":"English","publisher":"Springer","doi":"10.1007/s10933-006-9052-3","issn":"09212728","usgsCitation":"Johnston, J., Thompson, T., Wilcox, D., and Baedke, S., 2007, Geomorphic and sedimentologic evidence for the separation of Lake Superior from Lake Michigan and Huron: Journal of Paleolimnology, v. 37, no. 3, p. 349-364, https://doi.org/10.1007/s10933-006-9052-3.","productDescription":"16 p.","startPage":"349","endPage":"364","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":476986,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"http://hdl.handle.net/20.500.12648/2302","text":"External Repository"},{"id":240655,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213070,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10933-006-9052-3"}],"volume":"37","issue":"3","noUsgsAuthors":false,"publicationDate":"2006-12-16","publicationStatus":"PW","scienceBaseUri":"505a277fe4b0c8380cd5993d","contributors":{"authors":[{"text":"Johnston, J.W.","contributorId":67260,"corporation":false,"usgs":true,"family":"Johnston","given":"J.W.","email":"","affiliations":[],"preferred":false,"id":425067,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Thompson, T.A.","contributorId":73226,"corporation":false,"usgs":true,"family":"Thompson","given":"T.A.","email":"","affiliations":[],"preferred":false,"id":425068,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wilcox, D.A.","contributorId":55382,"corporation":false,"usgs":true,"family":"Wilcox","given":"D.A.","email":"","affiliations":[],"preferred":false,"id":425066,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Baedke, S.J.","contributorId":14585,"corporation":false,"usgs":true,"family":"Baedke","given":"S.J.","affiliations":[],"preferred":false,"id":425065,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"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":"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.
","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":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":486,"text":"OGW Branch of Geophysics","active":true,"usgs":true},{"id":493,"text":"Office of Ground Water","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":493,"text":"Office of Ground Water","active":true,"usgs":true},{"id":486,"text":"OGW Branch of Geophysics","active":true,"usgs":true}],"preferred":false,"id":424537,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029959,"text":"70029959 - 2007 - Multiple-species analysis of point count data: A more parsimonious modelling framework","interactions":[],"lastModifiedDate":"2012-03-12T17:21:36","indexId":"70029959","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2163,"text":"Journal of Applied Ecology","active":true,"publicationSubtype":{"id":10}},"title":"Multiple-species analysis of point count data: A more parsimonious modelling framework","docAbstract":"1. Although population surveys often provide information on multiple species, these data are rarely analysed within a multiple-species framework despite the potential for more efficient estimation of population parameters. 2. We have developed a multiple-species modelling framework that uses similarities in capture/detection processes among species to model multiple species data more parsimoniously. We present examples of this approach applied to distance, time of detection and multiple observer sampling for avian point count data. 3. Models that included species as a covariate and individual species effects were generally selected as the best models for distance sampling, but group models without species effects performed best for the time of detection and multiple observer methods. Population estimates were more precise for no-species-effect models than for species-effect models, demonstrating the benefits of exploiting species' similarities when modelling multiple species data. Partial species-effect models and additive models were also useful because they modelled similarities among species while allowing for species differences. 4. Synthesis and applications. We recommend the adoption of multiple-species modelling because of its potential for improved population estimates. This framework will be particularly beneficial for modelling count data from rare species because information on the detection process can be 'borrowed' from more common species. The multiple-species modelling framework presented here is applicable to a wide range of sampling techniques and taxa. ?? 2007 The Authors.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Applied Ecology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1111/j.1365-2664.2006.01271.x","issn":"00218901","usgsCitation":"Alldredge, M., Pollock, K.H., Simons, T., and Shriner, S., 2007, Multiple-species analysis of point count data: A more parsimonious modelling framework: Journal of Applied Ecology, v. 44, no. 2, p. 281-290, https://doi.org/10.1111/j.1365-2664.2006.01271.x.","startPage":"281","endPage":"290","numberOfPages":"10","costCenters":[],"links":[{"id":476979,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1111/j.1365-2664.2006.01271.x","text":"Publisher Index Page"},{"id":213097,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1111/j.1365-2664.2006.01271.x"},{"id":240686,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"44","issue":"2","noUsgsAuthors":false,"publicationDate":"2007-02-19","publicationStatus":"PW","scienceBaseUri":"505a608fe4b0c8380cd71538","contributors":{"authors":[{"text":"Alldredge, M.W.","contributorId":50263,"corporation":false,"usgs":true,"family":"Alldredge","given":"M.W.","email":"","affiliations":[],"preferred":false,"id":425070,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Pollock, K. H.","contributorId":65184,"corporation":false,"usgs":false,"family":"Pollock","given":"K.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":425072,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Simons, T.R.","contributorId":56334,"corporation":false,"usgs":true,"family":"Simons","given":"T.R.","email":"","affiliations":[],"preferred":false,"id":425071,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Shriner, S.A.","contributorId":26405,"corporation":false,"usgs":true,"family":"Shriner","given":"S.A.","affiliations":[],"preferred":false,"id":425069,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029857,"text":"70029857 - 2007 - Biomarkers of contaminant exposure in northern pike (Esox lucius) from the Yukon River Basin, Alaska","interactions":[],"lastModifiedDate":"2016-06-01T15:26:02","indexId":"70029857","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":887,"text":"Archives of Environmental Contamination and Toxicology","active":true,"publicationSubtype":{"id":10}},"title":"Biomarkers of contaminant exposure in northern pike (Esox lucius) from the Yukon River Basin, Alaska","docAbstract":"As part of a larger investigation, northern pike (n = 158; Esox lucius) were collected from ten sites in the Yukon River Basin (YRB), Alaska, to document biomarkers and their correlations with organochlorine pesticide (total p,p'-DDT, total chlordane, dieldrin, and toxaphene), total polychlorinated biphenyls (PCBs), and elemental contaminant (arsenic, cadmium, copper, lead, total mercury, selenium, and zinc) concentrations. A suite of biomarkers including somatic indices, hepatic 7-ethoxyresorufin O-deethylase (EROD) activity, vitellogenin concentrations, steroid hormone (17B- ustradiol and 16-kebtestosteront) concentrations, splenic macrophage aggregates (MAs), oocyte atresia, and other microscopic anomalies in various tissues were documented in YRB pike. Mean condition factor (0.50 to 0.68), hepatosomatic index (1.00% to 3.56%), and splenosomatic index (0.09% to 0.18%) were not anomalous at any site nor correlated with any contaminant concentration. Mean EROD activity (0.71 to 17.51 pmol/min/mg protein) was similar to basal activity levels previously measured in pike and was positively correlated with selenium concentrations (r = 0.88, P < 0.01). Vitellogenin concentrations in female (0.09 to 5.32 mg/mL) and male (0.01 mg/mL in male pike from multiple sites indicated exposure to estrogenic compounds. Mean steroid hormone concentrations and percent oocyte atresia were not anomalous in pike from any YRB site. Few site differences were significant for mean MA density (1.86 to 6.42 MA/mm2), size (812 to 1481 ??m2), and tissue occupied (MA-%; 0.24% to 0.75%). A linear regression between MA-% and total PCBs was significant, although PCB concentrations were generally low in YRB pike (???63 ng/g), and MA-% values in female pike (0.24% to 0.54%) were lower than in male pike (0.32% to 0.75%) at similar PCB concentrations. Greater numbers of MAs were found as zinc concentrations increased in YRB female pike, but it is unlikely that this is a causative relationship. Histological abnormalities observed in gill, liver, spleen, and kidney tissues were not likely a result of contaminant exposure but provide information on the general health of YRB pike. The most common histologic anomalies were parasitic infestations in various organs and developing nephrons and nephrocalcinosis in posterior kidney tissues. Overall, few biomarker responses in YRB pike were correlated with chemical contaminant concentrations, and YRB pike generally appeared to be healthy with no site having multiple anomalous biomarker responses. ?? 2007 Springer Science+Business Media, LLC.
","language":"English","publisher":"Springer-Verlag","doi":"10.1007/s00244-006-0134-z","issn":"00904341","usgsCitation":"Hinck, J., Blazer, V., Denslow, N., Myers, M., Gross, T., and Tillitt, D.E., 2007, Biomarkers of contaminant exposure in northern pike (Esox lucius) from the Yukon River Basin, Alaska: Archives of Environmental Contamination and Toxicology, v. 52, no. 4, p. 549-562, https://doi.org/10.1007/s00244-006-0134-z.","productDescription":"14 p.","startPage":"549","endPage":"562","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"links":[{"id":240649,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213065,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s00244-006-0134-z"}],"country":"United States","state":"Alaska","otherGeospatial":"Yukon River Basin","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -164.4873046875,\n 62.825055614564306\n ],\n [\n -163.80615234375,\n 62.72453320538486\n ],\n [\n -163.2568359375,\n 62.21675570485806\n ],\n [\n -160.99365234375,\n 62.84511898552855\n ],\n [\n -159.03808593749997,\n 64.8115572502203\n ],\n [\n -152.90771484375,\n 65.9554260417959\n ],\n [\n -145.9423828125,\n 66.93006025862448\n ],\n [\n -143.76708984375,\n 66.67038675925365\n ],\n [\n -141.48193359375,\n 65.5766364488888\n ],\n [\n -146.44775390625,\n 63.68524808030715\n ],\n [\n -153.0615234375,\n 64.50118574349311\n ],\n [\n -157.1484375,\n 63.6560114418332\n ],\n [\n -160.3564453125,\n 61.40723633876356\n ],\n [\n -165.30029296875,\n 61.96994329935751\n ],\n [\n -165.47607421874997,\n 62.27814559876582\n ],\n [\n -164.94873046875,\n 62.895217544882044\n ],\n [\n -164.4873046875,\n 62.825055614564306\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"52","issue":"4","noUsgsAuthors":false,"publicationDate":"2007-03-29","publicationStatus":"PW","scienceBaseUri":"5059f189e4b0c8380cd4aca8","contributors":{"authors":[{"text":"Hinck, J.E.","contributorId":47560,"corporation":false,"usgs":true,"family":"Hinck","given":"J.E.","affiliations":[],"preferred":false,"id":424612,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Blazer, V. S. 0000-0001-6647-9614","orcid":"https://orcid.org/0000-0001-6647-9614","contributorId":56991,"corporation":false,"usgs":true,"family":"Blazer","given":"V. S.","affiliations":[],"preferred":false,"id":424613,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Denslow, N. D.","contributorId":101606,"corporation":false,"usgs":false,"family":"Denslow","given":"N. D.","affiliations":[],"preferred":false,"id":424617,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Myers, M.S.","contributorId":65672,"corporation":false,"usgs":true,"family":"Myers","given":"M.S.","email":"","affiliations":[],"preferred":false,"id":424614,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Gross, T. S.","contributorId":95828,"corporation":false,"usgs":true,"family":"Gross","given":"T. S.","affiliations":[],"preferred":false,"id":424616,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Tillitt, D. E.","contributorId":83462,"corporation":false,"usgs":true,"family":"Tillitt","given":"D.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":424615,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70195055,"text":"70195055 - 2007 - USGS assessment of undiscovered oil and gas resources in Paleogene strata of the U.S. Gulf of Mexico coastal plain and state waters","interactions":[],"lastModifiedDate":"2018-10-29T11:39:39","indexId":"70195055","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"USGS assessment of undiscovered oil and gas resources in Paleogene strata of the U.S. Gulf of Mexico coastal plain and state waters","docAbstract":"This report presents a review of the U.S. Geological Survey (USGS) 2007 assessment of the undiscovered oil and gas resources in Paleogene strata underlying the U.S. Gulf of Mexico Coastal Plain and state waters. Geochemical, geologic, geophysical, thermal maturation, burial history, and paleontologic studies have been combined with regional cross sections and data from previous USGS petroleum assessments have helped to define the major petroleum systems and assessment units. Accumulations of both conventional oil and gas and continuous coal-bed gas within these petroleum systems have been digitally mapped and evaluated, and undiscovered resources have been assessed following USGS methodology.
The primary source intervals for oil and gas in Paleogene (and Cenozoic) reservoirs are coal and shale rich in organic matter within the Wilcox Group (Paleocene-Eocene) and Sparta Formation of the Claiborne Group (Eocene); in addition, Cretaceous and Jurassic source rocks probably have contributed substantial petroleum to Paleogene (and Cenozoic) reservoirs.
For the purposes of the assessment, Paleogene strata have divided into the following four stratigraphic study intervals: (1) Wilcox Group (including the Midway Group and the basal Carrizo Sand of the Claiborne Group; Paleocene-Eocene); (2) Claiborne Group (Eocene); (3) Jackson and Vicksburg Groups (Eocene-Oligocene); and (4) the Frio-Anahuac Formations (Oligocene). Recent discoveries of coal-bed gas in Paleocene strata confirm a new petroleum system that was not recognized in previous USGS assessments. In total, 26 conventional Paleogene assessment units are defined. In addition, four Cretaceous-Paleogene continuous (coal-bed gas) assessment units are included in this report. Initial results of the assessment will be released as USGS Fact Sheets (not available at the time of this writing).
Comprehensive reports for each assessment unit are planned to be released via the internet and distributed on CD-ROMs within the next year.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"The Paleogene of the Gulf of Mexico and Caribbean basins: Processes, events, and petroleum systems","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"27th Annual Gulf Coast Section SEPM Foundation Bob F. Perkins Research Conference","conferenceDate":"December 2-5, 2007","conferenceLocation":"Houston, TX","language":"English","publisher":"SEPM Society for Sedimentary Geology","doi":"10.5724/gcs.07.27.0002","isbn":"978-0-9836096-3-6","usgsCitation":"Warwick, P.D., Coleman, J.L., Hackley, P.C., Hayba, D.O., Karlsen, A.W., Rowan, E.L., and Swanson, S.M., 2007, USGS assessment of undiscovered oil and gas resources in Paleogene strata of the U.S. Gulf of Mexico coastal plain and state waters, in The Paleogene of the Gulf of Mexico and Caribbean basins: Processes, events, and petroleum systems, v. 27, Houston, TX, December 2-5, 2007, p. 2-44, https://doi.org/10.5724/gcs.07.27.0002.","productDescription":"43 p.","startPage":"2","endPage":"44","ipdsId":"IP-006895","costCenters":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true},{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"links":[{"id":351049,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"U.S. Gulf Coast","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -99.052734375,\n 24.327076540018634\n ],\n [\n -79.541015625,\n 24.327076540018634\n ],\n [\n -79.541015625,\n 33.797408767572485\n ],\n [\n -99.052734375,\n 33.797408767572485\n ],\n [\n -99.052734375,\n 24.327076540018634\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"27","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a7acd20e4b00f54eb20c594","contributors":{"editors":[{"text":"Kennan, Lorcan","contributorId":102036,"corporation":false,"usgs":false,"family":"Kennan","given":"Lorcan","email":"","affiliations":[],"preferred":false,"id":726761,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Pindell, James","contributorId":86137,"corporation":false,"usgs":false,"family":"Pindell","given":"James","email":"","affiliations":[],"preferred":false,"id":726762,"contributorType":{"id":2,"text":"Editors"},"rank":2},{"text":"Rosen, Norman C.","contributorId":40565,"corporation":false,"usgs":false,"family":"Rosen","given":"Norman","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":726770,"contributorType":{"id":2,"text":"Editors"},"rank":3}],"authors":[{"text":"Warwick, Peter D. 0000-0002-3152-7783 pwarwick@usgs.gov","orcid":"https://orcid.org/0000-0002-3152-7783","contributorId":762,"corporation":false,"usgs":true,"family":"Warwick","given":"Peter","email":"pwarwick@usgs.gov","middleInitial":"D.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":false,"id":726763,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Coleman, James L. jlcoleman@usgs.gov","contributorId":141060,"corporation":false,"usgs":true,"family":"Coleman","given":"James","email":"jlcoleman@usgs.gov","middleInitial":"L.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":726764,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hackley, Paul C. 0000-0002-5957-2551 phackley@usgs.gov","orcid":"https://orcid.org/0000-0002-5957-2551","contributorId":592,"corporation":false,"usgs":true,"family":"Hackley","given":"Paul","email":"phackley@usgs.gov","middleInitial":"C.","affiliations":[{"id":255,"text":"Energy Resources Program","active":true,"usgs":true},{"id":241,"text":"Eastern Energy Resources Science 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erowan@usgs.gov","orcid":"https://orcid.org/0000-0001-5753-6189","contributorId":2075,"corporation":false,"usgs":true,"family":"Rowan","given":"Elisabeth","email":"erowan@usgs.gov","middleInitial":"L.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":726768,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Swanson, Sharon M. 0000-0002-4235-1736 smswanson@usgs.gov","orcid":"https://orcid.org/0000-0002-4235-1736","contributorId":590,"corporation":false,"usgs":true,"family":"Swanson","given":"Sharon","email":"smswanson@usgs.gov","middleInitial":"M.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":726769,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70029960,"text":"70029960 - 2007 - Progressive oxidation of pyrite in five bituminous coal samples: An As XANES and 57Fe Mössbauer spectroscopic study","interactions":[],"lastModifiedDate":"2015-04-13T10:32:00","indexId":"70029960","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":835,"text":"Applied Geochemistry","active":true,"publicationSubtype":{"id":10}},"title":"Progressive oxidation of pyrite in five bituminous coal samples: An As XANES and 57Fe Mössbauer spectroscopic study","docAbstract":"Naturally occurring pyrite commonly contains minor substituted metals and metalloids (As, Se, Hg, Cu, Ni, etc.) that can be released to the environment as a result of its weathering. Arsenic, often the most abundant minor constituent in pyrite, is a sensitive monitor of progressive pyrite oxidation in coal. To test the effect of pyrite composition and environmental parameters on the rate and extent of pyrite oxidation in coal, splits of five bituminous coal samples having differing amounts of pyrite and extents of As substitution in the pyrite, were exposed to a range of simulated weathering conditions over a period of 17 months. Samples investigated include a Springfield coal from Indiana (whole coal pyritic S = 2.13 wt.%; As in pyrite = detection limit (d.l.) to 0.06 wt.%), two Pittsburgh coal samples from West Virginia (pyritic S = 1.32–1.58 wt.%; As in pyrite = d.l. to 0.34 wt.%), and two samples from the Warrior Basin, Alabama (pyritic S = 0.26–0.27 wt.%; As in pyrite = d.l. to 2.72 wt.%). Samples were collected from active mine faces, and expected differences in the concentration of As in pyrite were confirmed by electron microprobe analysis. Experimental weathering conditions in test chambers were maintained as follows: (1) dry Ar atmosphere; (2) dry O2 atmosphere; (3) room atmosphere (relative humidity ∼20–60%); and (4) room atmosphere with samples wetted periodically with double-distilled water. Sample splits were removed after one month, nine months, and 17 months to monitor the extent of As and Fe oxidation using As X-ray absorption near-edge structure (XANES) spectroscopy and 57Fe Mössbauer spectroscopy, respectively. Arsenic XANES spectroscopy shows progressive oxidation of pyritic As to arsenate, with wetted samples showing the most rapid oxidation. 57Fe Mössbauer spectroscopy also shows a much greater proportion of Fe3+ forms (jarosite, Fe3+ sulfate, FeOOH) for samples stored under wet conditions, but much less difference among samples stored under dry conditions in different atmospheres. The air-wet experiments show evidence of pyrite re-precipitation from soluble ferric sulfates, with As retention in the jarosite phase. Extents of As and Fe oxidation were similar for samples having differing As substitution in pyrite, suggesting that environmental conditions outweigh the composition and amount of pyrite as factors influencing the oxidation rate of Fe sulfides in coal.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.apgeochem.2006.10.006","issn":"08832927","usgsCitation":"Kolker, A., and Huggins, F.E., 2007, Progressive oxidation of pyrite in five bituminous coal samples: An As XANES and 57Fe Mössbauer spectroscopic study: Applied Geochemistry, v. 22, no. 4, p. 778-787, https://doi.org/10.1016/j.apgeochem.2006.10.006.","productDescription":"10 p.","startPage":"778","endPage":"787","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":240687,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213098,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.apgeochem.2006.10.006"}],"volume":"22","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a8ee7e4b0c8380cd7f472","contributors":{"authors":[{"text":"Kolker, Allan 0000-0002-5768-4533 akolker@usgs.gov","orcid":"https://orcid.org/0000-0002-5768-4533","contributorId":643,"corporation":false,"usgs":true,"family":"Kolker","given":"Allan","email":"akolker@usgs.gov","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":425073,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Huggins, Frank E.","contributorId":81273,"corporation":false,"usgs":true,"family":"Huggins","given":"Frank","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":425074,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029963,"text":"70029963 - 2007 - New insights into the history and origin of the southern Maya block, SE Mexico: U-Pb-SHRIMP zircon geochronology from metamorphic rocks of the Chiapas massif","interactions":[],"lastModifiedDate":"2019-11-12T14:27:24","indexId":"70029963","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2037,"text":"International Journal of Earth Sciences","active":true,"publicationSubtype":{"id":10}},"title":"New insights into the history and origin of the southern Maya block, SE Mexico: U-Pb-SHRIMP zircon geochronology from metamorphic rocks of the Chiapas massif","docAbstract":"The histories of the pre-Mesozoic landmasses in southern México and their connections with Laurentia, Gondwana, and among themselves are crucial for the understanding of the Late Paleozoic assembly of Pangea. The Permian igneous and metamorphic rocks from the Chiapas massif as part of the southern Maya block, México, were dated by U–Pb zircon geochronology employing the SHRIMP (sensitive high resolution ion microprobe) facility at Stanford University. The Chiapas massif is composed of deformed granitoids and orthogneisses with inliers of metasedimentary rocks. SHRIMP data from an anatectic orthogneiss demonstrate that the Chiapas massif was part of a Permian (∼ 272 Ma) active continental margin established on the Pacific margin of Gondwana after the Ouachita orogeny. Latest Permian (252–254 Ma) medium- to high-grade metamorphism and deformation affected the entire Chiapas massif, resulting in anatexis and intrusion of syntectonic granitoids. This unique orogenic event is interpreted as the result of compression due to flat subduction and accretionary tectonics. SHRIMP data of zircon cores from a metapelite from the NE Chiapas massif yielded a single Grenvillian source for sediments. The majority of the zircon cores from a para-amphibolite from the SE part of the massif yielded either 1.0–1.2 or 1.4–1.5 Ga sources, indicating provenance from South American Sunsás and Rondonian-San Ignacio provinces.
","language":"English","publisher":"Springer","doi":"10.1007/s00531-006-0093-7","issn":"14373254","usgsCitation":"Weber, B., Iriondo, A., Premo, W.R., Hecht, L., and Schaaf, P., 2007, New insights into the history and origin of the southern Maya block, SE Mexico: U-Pb-SHRIMP zircon geochronology from metamorphic rocks of the Chiapas massif: International Journal of Earth Sciences, v. 96, no. 2, p. 253-269, https://doi.org/10.1007/s00531-006-0093-7.","productDescription":"17 p.","startPage":"253","endPage":"269","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":240185,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212663,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s00531-006-0093-7"}],"country":"Mexico","otherGeospatial":"Maya block","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -92.46093749999999,\n 14.519780046326085\n ],\n [\n -87.86865234374999,\n 18.437924653474408\n ],\n [\n -87.0556640625,\n 20.05593126519445\n ],\n [\n -86.77001953125,\n 21.4121622297254\n ],\n [\n -87.1875,\n 21.69826549685252\n ],\n [\n -88.8134765625,\n 21.596150576461426\n ],\n [\n -90.2197265625,\n 21.186972714123776\n ],\n [\n -90.68115234375,\n 20.673905264672843\n ],\n [\n -90.703125,\n 19.828725387681168\n ],\n [\n -91.01074218749999,\n 19.290405639497994\n ],\n [\n -91.77978515625,\n 18.95824648598139\n ],\n [\n -92.5048828125,\n 18.916679786648565\n ],\n [\n -93.71337890625,\n 18.500447458475094\n ],\n [\n -94.46044921875,\n 18.271086109608877\n ],\n [\n -94.833984375,\n 18.625424540701264\n ],\n [\n -95.51513671875,\n 18.93746442964186\n ],\n [\n -95.9326171875,\n 19.16592425362802\n ],\n [\n -96.26220703125,\n 19.87005983797396\n ],\n [\n -96.85546875,\n 20.406420474920292\n ],\n [\n -100.107421875,\n 16.762467717941604\n ],\n [\n -98.6572265625,\n 16.235772090429855\n ],\n [\n -97.5146484375,\n 15.792253570362446\n ],\n [\n -96.767578125,\n 15.432500881886055\n ],\n [\n -95.69091796875,\n 15.792253570362446\n ],\n [\n -94.89990234375,\n 16.109153239219467\n ],\n [\n -94.3505859375,\n 16.06692895745012\n ],\n [\n -93.6474609375,\n 15.517205256329813\n ],\n [\n -93.22998046875,\n 15.347761924346937\n ],\n [\n -92.7685546875,\n 14.753635331540442\n ],\n [\n -92.46093749999999,\n 14.519780046326085\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"96","issue":"2","noUsgsAuthors":false,"publicationDate":"2006-06-29","publicationStatus":"PW","scienceBaseUri":"505a65dbe4b0c8380cd72c6e","contributors":{"authors":[{"text":"Weber, Bodo","contributorId":54021,"corporation":false,"usgs":true,"family":"Weber","given":"Bodo","email":"","affiliations":[],"preferred":false,"id":425086,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Iriondo, Alexander","contributorId":23619,"corporation":false,"usgs":true,"family":"Iriondo","given":"Alexander","affiliations":[],"preferred":false,"id":425084,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Premo, Wayne R. 0000-0001-9904-4801 wpremo@usgs.gov","orcid":"https://orcid.org/0000-0001-9904-4801","contributorId":1697,"corporation":false,"usgs":true,"family":"Premo","given":"Wayne","email":"wpremo@usgs.gov","middleInitial":"R.","affiliations":[],"preferred":true,"id":425083,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hecht, Lutz","contributorId":43571,"corporation":false,"usgs":true,"family":"Hecht","given":"Lutz","email":"","affiliations":[],"preferred":false,"id":425085,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Schaaf, Peter","contributorId":93703,"corporation":false,"usgs":true,"family":"Schaaf","given":"Peter","email":"","affiliations":[],"preferred":false,"id":425087,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70029965,"text":"70029965 - 2007 - Defining space use and movements of Canada lynx with global positioning system telemetry","interactions":[],"lastModifiedDate":"2017-09-14T09:35:00","indexId":"70029965","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2373,"text":"Journal of Mammalogy","onlineIssn":"1545-1542","printIssn":"0022-2372","active":true,"publicationSubtype":{"id":10}},"title":"Defining space use and movements of Canada lynx with global positioning system telemetry","docAbstract":"Space use and movements of Canada lynx (Lynx canadensis) are difficult to study with very-high-frequency radiocollars. We deployed global positioning system (GPS) collars on 11 lynx in Minnesota to study their seasonal space-use patterns. We estimated home ranges with minimum-convex-polygon and fixed-kernel methods and estimated core areas with area/probability curves. Fixed-kernel home ranges of males (range = 29-522 km2) were significantly larger than those of females (range = 5-95 km2) annually and during the denning season. Some male lynx increased movements during March, the month most influenced by breeding activity. Lynx core areas were predicted by the 60% fixed-kernel isopleth in most seasons. The mean core-area size of males (range = 6-190 km2) was significantly larger than that of females (range = 1-19 km2) annually and during denning. Most female lynx were reproductive animals with reduced movements, whereas males often ranged widely between Minnesota and Ontario. Sensitivity analyses examining the effect of location frequency on home-range size suggest that the home-range sizes of breeding females are less sensitive to sample size than those of males. Longer periods between locations decreased home-range and core-area overlap relative to the home range estimated from daily locations. GPS collars improve our understanding of space use and movements by lynx by increasing the spatial extent and temporal frequency of monitoring and allowing home ranges to be estimated over short periods that are relevant to life-history characteristics. ?? 2007 American Society of Mammalogists.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Mammalogy","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1644/06-MAMM-A-181R.1","issn":"00222372","usgsCitation":"Burdett, C., Moen, R., Niemi, G., and Mech, L., 2007, Defining space use and movements of Canada lynx with global positioning system telemetry: Journal of Mammalogy, v. 88, no. 2, p. 457-467, https://doi.org/10.1644/06-MAMM-A-181R.1.","productDescription":"11 p.","startPage":"457","endPage":"467","costCenters":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":240217,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212692,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1644/06-MAMM-A-181R.1"}],"volume":"88","issue":"2","noUsgsAuthors":false,"publicationDate":"2007-04-20","publicationStatus":"PW","scienceBaseUri":"5059fe39e4b0c8380cd4ebd9","contributors":{"authors":[{"text":"Burdett, C.L.","contributorId":10295,"corporation":false,"usgs":true,"family":"Burdett","given":"C.L.","email":"","affiliations":[],"preferred":false,"id":425091,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Moen, R.A.","contributorId":72264,"corporation":false,"usgs":true,"family":"Moen","given":"R.A.","email":"","affiliations":[],"preferred":false,"id":425092,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Niemi, G.J.","contributorId":80234,"corporation":false,"usgs":true,"family":"Niemi","given":"G.J.","email":"","affiliations":[],"preferred":false,"id":425094,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Mech, L.D. 0000-0003-3944-7769","orcid":"https://orcid.org/0000-0003-3944-7769","contributorId":75466,"corporation":false,"usgs":false,"family":"Mech","given":"L.D.","email":"","affiliations":[],"preferred":false,"id":425093,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029969,"text":"70029969 - 2007 - Organic petrology and coalbed gas content, Wilcox Group (Paleocene-Eocene), northern Louisiana","interactions":[],"lastModifiedDate":"2018-02-01T12:48:35","indexId":"70029969","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2033,"text":"International Journal of Coal Geology","active":true,"publicationSubtype":{"id":10}},"title":"Organic petrology and coalbed gas content, Wilcox Group (Paleocene-Eocene), northern Louisiana","docAbstract":"Wilcox Group (Paleocene–Eocene) coal and carbonaceous shale samples collected from four coalbed methane test wells in northern Louisiana were characterized through an integrated analytical program. Organic petrographic analyses, gas desorption and adsorption isotherm measurements, and proximate–ultimate analyses were conducted to provide insight into conditions of peat deposition and the relationships between coal composition, rank, and coalbed gas storage characteristics. The results of petrographic analyses indicate that woody precursor materials were more abundant in stratigraphically higher coal zones in one of the CBM wells, consistent with progradation of a deltaic depositional system (Holly Springs delta complex) into the Gulf of Mexico during the Paleocene–Eocene. Comparison of petrographic analyses with gas desorption measurements suggests that there is not a direct relationship between coal type (sensu maceral composition) and coalbed gas storage. Moisture, as a function of coal rank (lignite–subbituminous A), exhibits an inverse relationship with measured gas content. This result may be due to higher moisture content competing for adsorption space with coalbed gas in shallower, lower rank samples. Shallower (< 600 m) coal samples consistently are undersaturated with respect to CH4 adsorption isotherms; deeper (> 600 m) coal samples containing less moisture range from under- to oversaturated with respect to their CH4adsorption capacity.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.coal.2006.05.009","usgsCitation":"Hackley, P.C., Warwick, P.D., and Breland, F.C., 2007, Organic petrology and coalbed gas content, Wilcox Group (Paleocene-Eocene), northern Louisiana: International Journal of Coal Geology, v. 71, no. 1, p. 54-71, https://doi.org/10.1016/j.coal.2006.05.009.","productDescription":"18 p.","startPage":"54","endPage":"71","costCenters":[],"links":[{"id":240288,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"71","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a6fd5e4b0c8380cd75cbe","contributors":{"authors":[{"text":"Hackley, Paul C. 0000-0002-5957-2551 phackley@usgs.gov","orcid":"https://orcid.org/0000-0002-5957-2551","contributorId":592,"corporation":false,"usgs":true,"family":"Hackley","given":"Paul","email":"phackley@usgs.gov","middleInitial":"C.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true},{"id":255,"text":"Energy Resources Program","active":true,"usgs":true}],"preferred":true,"id":425120,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Warwick, Peter D. 0000-0002-3152-7783 pwarwick@usgs.gov","orcid":"https://orcid.org/0000-0002-3152-7783","contributorId":762,"corporation":false,"usgs":true,"family":"Warwick","given":"Peter","email":"pwarwick@usgs.gov","middleInitial":"D.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":false,"id":425118,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Breland, F. Clayton Jr.","contributorId":43842,"corporation":false,"usgs":true,"family":"Breland","given":"F.","suffix":"Jr.","email":"","middleInitial":"Clayton","affiliations":[],"preferred":false,"id":425119,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029970,"text":"70029970 - 2007 - Ammonia causes decreased brain monoamines in fathead minnows (Pimephales promelas)","interactions":[],"lastModifiedDate":"2016-10-13T10:52:23","indexId":"70029970","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1074,"text":"Brain Research","active":true,"publicationSubtype":{"id":10}},"title":"Ammonia causes decreased brain monoamines in fathead minnows (Pimephales promelas)","docAbstract":"Hyperammonemia, arising from variety of disorders, leads to severe neurological dysfunction. The mechanisms of ammonia toxicity in brain are not completely understood. This study investigated the effects of ammonia on monoaminergic systems in brains of fathead minnows (Pimephales promelas). Fish serve as a good model system to investigate hyperammonemic effects on brain function since no liver manipulations are necessary to increase endogenous ammonia concentrations. Using high performance liquid chromatography with electrochemical detection, monoamines and some associated metabolites were measured from whole brain homogenate. Adult males were exposed for 48 h to six different concentrations of ammonia (0.01–2.36 mg/l unionized) which bracketed the 96-h LC50 for this species. Ammonia concentration-dependent decreases were found for the catecholamines (norepinephrine and dopamine) and the indoleamine serotonin (5-HT). After an initial increase in the 5-HT precursor 5-hydroxytryptophan it too decreased with increasing ammonia concentrations. There were also significant increases in the 5-HIAA/5-HT and DOPAC/DA ratios, often used as measures of turnover. There were no changes in epinephrine (Epi) or monoamine catabolites (DOPAC, 5-HIAA) at any ammonia concentrations tested. Results suggest that ammonia causes decreased synthesis while also causing increased release and degradation. Increased release may underlie behavioral reactions to ammonia exposure in fish. This study adds weight to a growing body of evidence demonstrating that ammonia leads to dysfunctional monoaminergic systems in brain which may underlie neurological symptoms associated with human disorders such as hepatic encephalopathy.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.brainres.2007.02.015","issn":"00068993","usgsCitation":"Ronan, P.J., Gaikowski, M., Hamilton, S., Buhl, K.J., and Summers, C.H., 2007, Ammonia causes decreased brain monoamines in fathead minnows (Pimephales promelas): Brain Research, v. 1147, p. 184-191, https://doi.org/10.1016/j.brainres.2007.02.015.","productDescription":"8 p.","startPage":"184","endPage":"191","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"links":[{"id":240322,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":212784,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.brainres.2007.02.015"}],"volume":"1147","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e9bde4b0c8380cd4840f","contributors":{"authors":[{"text":"Ronan, Patrick J.","contributorId":175335,"corporation":false,"usgs":false,"family":"Ronan","given":"Patrick","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":425125,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Gaikowski, Mark P. 0000-0002-6507-9341 mgaikowski@usgs.gov","orcid":"https://orcid.org/0000-0002-6507-9341","contributorId":140353,"corporation":false,"usgs":true,"family":"Gaikowski","given":"Mark P.","email":"mgaikowski@usgs.gov","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":false,"id":425124,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hamilton, Steven J.","contributorId":174108,"corporation":false,"usgs":false,"family":"Hamilton","given":"Steven J.","affiliations":[],"preferred":false,"id":425122,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Buhl, Kevin J. 0000-0002-9963-2352 kevin_buhl@usgs.gov","orcid":"https://orcid.org/0000-0002-9963-2352","contributorId":1396,"corporation":false,"usgs":true,"family":"Buhl","given":"Kevin","email":"kevin_buhl@usgs.gov","middleInitial":"J.","affiliations":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"preferred":true,"id":425121,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Summers, Cliff H.","contributorId":66218,"corporation":false,"usgs":true,"family":"Summers","given":"Cliff","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":425123,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70029851,"text":"70029851 - 2007 - Structure-specific scalar intensity measures for near-source and ordinary earthquake ground motions","interactions":[],"lastModifiedDate":"2012-03-12T17:21:07","indexId":"70029851","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1436,"text":"Earthquake Spectra","active":true,"publicationSubtype":{"id":10}},"title":"Structure-specific scalar intensity measures for near-source and ordinary earthquake ground motions","docAbstract":"Introduced in this paper are several alternative ground-motion intensity measures (IMs) that are intended for use in assessing the seismic performance of a structure at a site susceptible to near-source and/or ordinary ground motions. A comparison of such IMs is facilitated by defining the \"efficiency\" and \"sufficiency\" of an IM, both of which are criteria necessary for ensuring the accuracy of the structural performance assessment. The efficiency and sufficiency of each alternative IM, which are quantified via (i) nonlinear dynamic analyses of the structure under a suite of earthquake records and (ii) linear regression analysis, are demonstrated for the drift response of three different moderate- to long-period buildings subjected to suites of ordinary and of near-source earthquake records. One of the alternative IMs in particular is found to be relatively efficient and sufficient for the range of buildings considered and for both the near-source and ordinary ground motions. ?? 2007, Earthquake Engineering Research Institute.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Earthquake Spectra","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1193/1.2723158","issn":"87552930","usgsCitation":"Luco, N., and Cornell, C., 2007, Structure-specific scalar intensity measures for near-source and ordinary earthquake ground motions: Earthquake Spectra, v. 23, no. 2, p. 357-392, https://doi.org/10.1193/1.2723158.","startPage":"357","endPage":"392","numberOfPages":"36","costCenters":[],"links":[{"id":212951,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1193/1.2723158"},{"id":240521,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"23","issue":"2","noUsgsAuthors":false,"publicationDate":"2007-05-01","publicationStatus":"PW","scienceBaseUri":"505b9c79e4b08c986b31d405","contributors":{"authors":[{"text":"Luco, N.","contributorId":34240,"corporation":false,"usgs":true,"family":"Luco","given":"N.","email":"","affiliations":[],"preferred":false,"id":424583,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cornell, C.A.","contributorId":36238,"corporation":false,"usgs":true,"family":"Cornell","given":"C.A.","email":"","affiliations":[],"preferred":false,"id":424584,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029971,"text":"70029971 - 2007 - Plan curvature and landslide probability in regions dominated by earth flows and earth slides","interactions":[],"lastModifiedDate":"2012-03-12T17:21:09","indexId":"70029971","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1517,"text":"Engineering Geology","active":true,"publicationSubtype":{"id":10}},"title":"Plan curvature and landslide probability in regions dominated by earth flows and earth slides","docAbstract":"Damaging landslides in the Appalachian Plateau and scattered regions within the Midcontinent of North America highlight the need for landslide-hazard mapping and a better understanding of the geomorphic development of landslide terrains. The Plateau and Midcontinent have the necessary ingredients for landslides including sufficient relief, steep slope gradients, Pennsylvanian and Permian cyclothems that weather into fine-grained soils containing considerable clay, and adequate precipitation. One commonly used parameter in landslide-hazard analysis that is in need of further investigation is plan curvature. Plan curvature is the curvature of the hillside in a horizontal plane or the curvature of the contours on a topographic map. Hillsides can be subdivided into regions of concave outward plan curvature called hollows, convex outward plan curvature called noses, and straight contours called planar regions. Statistical analysis of plan-curvature and landslide datasets indicate that hillsides with planar plan curvature have the highest probability for landslides in regions dominated by earth flows and earth slides in clayey soils (CH and CL). The probability of landslides decreases as the hillsides become more concave or convex. Hollows have a slightly higher probability for landslides than noses. In hollows landslide material converges into the narrow region at the base of the slope. The convergence combined with the cohesive nature of fine-grained soils creates a buttressing effect that slows soil movement and increases the stability of the hillside within the hollow. Statistical approaches that attempt to determine landslide hazard need to account for the complex relationship between plan curvature, type of landslide, and landslide susceptibility. ?? 2007 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Engineering Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.enggeo.2007.01.005","issn":"00137952","usgsCitation":"Ohlmacher, G., 2007, Plan curvature and landslide probability in regions dominated by earth flows and earth slides: Engineering Geology, v. 91, no. 2-4, p. 117-134, https://doi.org/10.1016/j.enggeo.2007.01.005.","startPage":"117","endPage":"134","numberOfPages":"18","costCenters":[],"links":[{"id":212785,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.enggeo.2007.01.005"},{"id":240323,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"91","issue":"2-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7b9ce4b0c8380cd79523","contributors":{"authors":[{"text":"Ohlmacher, G.C.","contributorId":63064,"corporation":false,"usgs":true,"family":"Ohlmacher","given":"G.C.","email":"","affiliations":[],"preferred":false,"id":425126,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ]}