Publications
Browse publications authored by our scientists. Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more. **Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Filter Total Items: 5022
Bear diets and human-bear conflicts: Insights from isotopic ecology Bear diets and human-bear conflicts: Insights from isotopic ecology
Bears, Ursidae, are considered omnivores, except for giant pandas Ailuropoda melanoleuca and polar bears Ursus maritimus. However, omnivory includes a wide range of dietary variation and trophic positions, making bear dietary ecology unclear. We inferred bear trophic positions from δ15N (‰) values and examined their correlation with diets reported in the literature, including frequency...
Authors
Nereyda Falconi, Tomas A. Carlo, Todd K. Fuller, Stephen DeStefano, John F. Organ
High densities of conspecifics buffer native fish from negative interactions with an ecologically similar invasive High densities of conspecifics buffer native fish from negative interactions with an ecologically similar invasive
Invasive species are a leading cause for native species declines, but it remains unclear whether maintenance of high native densities influence native persistence in freshwater systems. We designed complementary laboratory and field experiments to test whether high native cutthroat trout (Oncorhynchus clarkii) densities affect competition with invasive brown trout (Salmo trutta). We...
Authors
Casey A. Pennock, W. Carl Saunders, Phaedra E. Budy
Tracking spatial regimes in animal communities: Implications for resilience-based management Tracking spatial regimes in animal communities: Implications for resilience-based management
Spatial regimes (the spatial extents of ecological states) exhibit strong spatiotemporal order as they expand or contract in response to retreating or encroaching adjacent spatial regimes (e.g., woody plant invasion of grasslands) and human management (e.g., fire treatments). New methods enable tracking spatial regime boundaries via vegetation landcover data, and this approach is being...
Authors
Caleb Powell Roberts, Daniel R. Uden, Craig R. Allen, David G. Angeler, Larkin A. Powell, Brady W Allred, Matthew O. Jones, Jeremy D Maestas, Dirac Twidwell
Bridled Quail-Dove (Geotrygon mystacea) Bridled Quail-Dove (Geotrygon mystacea)
No abstract available.
Authors
Clint W. Boal, H. Madden
Direct and molecular observation of movement and reproduction by Candy Darter, Etheostoma osburni, an endangered benthic stream fish in Virginia, USA Direct and molecular observation of movement and reproduction by Candy Darter, Etheostoma osburni, an endangered benthic stream fish in Virginia, USA
Direct and indirect measures of individual movement provide valuable knowledge regarding a species’ resiliency to environmental change. Information on patterns of movement can inform species management and conservation but is lacking for many imperiled fishes. The Candy Darter, Etheostoma osburni, is an endangered stream fish with a dramatically reduced distribution in Virginia in the...
Authors
Kathryn E. McBaine, Eric M. Hallerman, Paul L. Angermeier
Influences of channel and floodplain modification on expansion of woody vegetation into Catahoula Lake, Louisiana, USA Influences of channel and floodplain modification on expansion of woody vegetation into Catahoula Lake, Louisiana, USA
Ecosystem structure of wetlands in managed floodplains depends on hydrological processes controlled by geomorphology and water management. Overlapping effects of direct modifications and geomorphic adjustments to management can combine to trigger changes to floodplain ecosystem structure. We examined the case of woody vegetation encroaching into the depressional Catahoula Lake, Louisiana...
Authors
R.F. Keim, L. Dugue, K.D. Latuso, S. Joshi, Sammy L. King, F.L. Willis
Age-specific survival rates, causes of death, and allowable take of golden eagles in the western United States Age-specific survival rates, causes of death, and allowable take of golden eagles in the western United States
In the United States, the Bald and Golden Eagle Protection Act prohibits take of golden eagles (Aquila chrysaetos) unless authorized by permit, and stipulates that all permitted take must be sustainable. Golden eagles are unintentionally killed in conjunction with many lawful activities (e.g., electrocution on power poles, collision with wind turbines). Managers who issue permits for...
Authors
Brian Milsap, Guthrie S. Zimmerman, William L. Kendall, Joseph G. Barnes, Melissa A. Braham, Bryan E Bedrosian, Douglas A. Bell, Peter H. Bloom, Ross H. Crandall, Robert Domenech, Daniel Driscoll, Adam E. Duerr, Rick Gerhardt, Samantha E.J. Gibbs, Alan R. Harmata, Kenneth Jacobson, Todd E. Katzner, Robert N. Knight, J. Michael Lockhart, Carol McIntyre, Robert K. Murphy, Steven J. Slater, Brian W. Smith, Jeff P. Smith, Dale W. Stahlecker, James W. Watson
Redundancy analysis reveals complex den use patterns by eastern spotted skunks, a conditional specialist Redundancy analysis reveals complex den use patterns by eastern spotted skunks, a conditional specialist
Wildlife managers tasked with understanding habitat and resource selection at the population level attempt to characterize patterns in nature that aid and inform conservation. Resource selection functions (RSFs), such as discrete choice analyses, are the standard convention to characterize the effects of habitat attributes on resource selection patterns. These tools are invaluable for...
Authors
Emily D. Thorne, W. Mark Ford
Phenomenological and mechanistic modeling of recreational angling behavior using creel data Phenomenological and mechanistic modeling of recreational angling behavior using creel data
Improved understanding of angling behavior in recreational fisheries can help managers account for partial controllability in systems in which angling effort is not directly regulated. Relevant aspects of angling behavior include fishing participation, site choice, and catch-and-release actions and can be considered at scales of both aggregate fishing effort and individual-decision...
Authors
Alexander J. Jensen, Steven J. Dundas, James Peterson
Response of nutrient limitation to invasive fish suppression: How carcasses and analog pellets alter periphyton Response of nutrient limitation to invasive fish suppression: How carcasses and analog pellets alter periphyton
The native Yellowstone Cutthroat Trout (Oncorhynchus clarkii bouvieri Jordan and Gilbert, 1883) population in Yellowstone Lake, Yellowstone National Park, Wyoming, USA, is in decline because of competition from the introduced, invasive Lake Trout (Salvelinus namaycush Walbaum in Artedi, 1792). Gillnetting is used to suppress adult Lake Trout; however, methods are being developed to...
Authors
Dominique R. Lujan, Lusha M. Tronstad, Michelle A. Briggs, Lindsey K. Albertson, Hayley C. Glassic, Christopher S. Guy, Todd M Koel
Critical thermal maximum of stream fishes including distinct populations of Smallmouth Bass Critical thermal maximum of stream fishes including distinct populations of Smallmouth Bass
Understanding the thermal tolerances of stream fishes, including sport fishes, is important for assessing thermal stressors that are common across the landscape. Our study objectives were to determine the thermal tolerances of 17 stream fishes (15 species and 2 genetically distinct populations of juvenile Smallmouth Bass Micropterus dolomieu: the Neosho subspecies M. dolomieu velox and...
Authors
Shannon K. Brewer, R. Mollenhauer, J. Alexander, D.E. Moore
Golden eagle occupancy surveys and monitoring strategy in coastal southern California, United States Golden eagle occupancy surveys and monitoring strategy in coastal southern California, United States
Golden eagles (Aquila chrysaetos) are of increasing conservation concern in western North America. Effective conservation measures for this wide-ranging, federally protected raptor species require monitoring frameworks that accommodate strong inference on the status of breeding populations across vast landscapes. We used a broad-scale sampling design to identify relationships between...
Authors
David Wiens, Peter H. Bloom, Melanie C. Madden, Patrick Kolar, Jeff A. Tracey, Robert N. Fisher