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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.

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Blooming wildflowers in Pinnacles National Park.

The circular highlights how our research efforts fulfill larger USGS strategic goals.

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Our History

Tricolored Heron at Ding Darling National Park

This book is dedicated to those who are or have been associated with the unit program. 

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Our Research

Yellow-billed Loon on a lake in the northern area of Alaska.

This report provides abstracts of most of the ongoing and recently completed research.

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Filter Total Items: 3984

Incorporating productivity as a measure of fitness into models of breeding area quality of Arctic peregrine falcons

Using empirical location data from individuals to model habitat quality and species distributions is valuable towards understanding habitat use of wildlife, especially for conservation and management planning. Incorporating measures of reproductive success or survival into these models helps address the role of vital rates (a surrogate of fitness) in affecting a species’ distribution. We used 24-y
Authors
David Andersen, Jason E. Bruggeman, Ted Swem, Patricia L. Kennedy, Debora Nigro
By
Cooperative Research Units

Potential effects of GPS transmitters on greater sage-grouse survival in a post-fire landscape

Rigorous monitoring and evaluation of wildlife population performance because of management or disturbance often relies upon the handling and marking of animals. Such studies must assume that marking animals does not affect their behavior or demography. We examined survival of greater sage-grouse Centrocercus urophasianus post wildfire in southeastern Oregon, USA. We observed extremely high mortal
Authors
Lee J. Foster, Katie Dugger, Christian A. Hagen, David A. Budeau
By
Cooperative Research Units

Size-structured habitat selection by arapaima in floodplain lakes of the lower Amazon

Human modification of floodplain ecosystems is widespread and a major threat to fish populations, particularly in the tropics where fish diversity and rates of floodplain degradation are high. Identifying measures to minimize the susceptibility of floodplain fishes to habitat modification requires understanding dry-season lake habitat selection for species of conservation concern.This study examin
Authors
Paul L. Angermeier, Jordan C. Richard, Leandro Castello, Daniel J. Gurdak, Brandon K. Peoples
By
Cooperative Research Units

An analysis of autocorrelation and bias in home range estimation

Home range estimation is routine practice in ecological research. While advances in animal tracking technology have increased our capacity to collect data to support home range analysis, these same advances have also resulted in increasingly autocorrelated data. Consequently, the question of which home range estimator to use on modern, highly autocorrelated tracking data remains open. This questio
Authors
Michael T. Noonan, Marlee A. Tucker, Christen H. Fleming, Thomas S. Akre, Susan C Alberts, Abdullahi H. Ali, Jeanne Altmann, Pamela Castro Antunes, Jerrold L. Belant, Dean Beyer, Niels Blaum, Katrin Bohning-Gaese, Larry Cullen, Rogerio Cunha de Paula, Jasia Dekker, Jonathan Drescher-Lehman, Nina Farwig, Claudia Fichtel, Christina Fischer, Adam T. Ford, Jacob R. Goheen, René Janssen, Florian Jeltsch, Matthew Kauffman, Peter M. Kappeler, Flavia Koch, Scott LaPoint, A. Catherine Markham, Emilia Patricia Medici, Ronaldo G. Morato, Ran Nathan, Luiz G. R. Oliveira-Santos, Kirk A. Olson, Bruce D. Patterson, Agustin Paviolo, Emiliano Esterci Ramalho, Sascha Rosner, Dana G. Schabo, Nuria Selva, Agnieszka Sergiel, Marina Xavier da Silva, Orr Spiegel, Peter C. Thompson, Wiebke Ullmann, Filip Zieba, Tomasz Zwijacz-Kozica, William F. Fagan, Thomas Mueller, J.M. Calabrese
By
Cooperative Research Units

Estimates of abundance and longevity of Bridled Quail-Doves (Geotrygon mystacea) on Guana Island, British Virgin Islands

The Bridled Quail-Dove (Geotrygon mystacea) is a columbiform resident of the eastern Caribbean. It is a poorly studied species with a lack of quantitative data to assess population status, but perceived population declines have led to it being considered a species of conservation concern on many islands. I attempted to assess population size and survival of Bridled Quail-Doves on Guana Island, Bri
Authors
Clint W. Boal
By
Cooperative Research Units

Population characteristics of Yellow Perch in a central Appalachia hydropower reservoir

Estimates of population characteristics of sport fishes inform fisheries management decisions and provide feedback on management strategies. Cheat Lake provides an unusual fishery in West Virginia because the hydropower reservoir supports a Yellow Perch Perca flavescens population. We estimated age structure, size structure, condition, total instantaneous mortality, growth, and summer diet for Che
Authors
Corbin D. Hilling, Nate D. Taylor, Stuart A. Welsh, Dustin M. Smith
By
Cooperative Research Units

Early life history

No abstract available.
Authors
Timothy B. Grabowski, Jonathan Grabowski
By
Cooperative Research Units

Genetic swamping and species collapse: Tracking introgression between the native Candy Darter and introduced Variegate Darter

Candy Darters (Etheostoma osburni) and Variegate Darters (E. variatum) are both native to West Virginia and Virginia. The geographic ranges of these two species were historically separated by Kanawha Falls, a natural barrier to fish dispersal located at Glen Ferris, WV. In the early 1980s, Variegate Darters or putative hybrids (E. osburni × E. variatum) were first collected at locations upstream o
Authors
Isaac Gibson, Amy B. Welsh, Stuart A. Welsh, Daniel A. Cincotta
By
Water Resources Mission Area, Cooperative Research Units, Virginia and West Virginia Water Science Center

Comparing growth and body condition of indoor-reared, outdoor-reared, and direct-released juvenile Mojave desert tortoises

Desert tortoise populations have declined, and head-starting hatchlings in captivity until they are larger and older — and presumably more likely to survive — is one strategy being evaluated for species recovery. Previous studies have reared hatchlings in outdoor, predator-proof pens for 5–9 years before release, in efforts to produce hatchlings in excess of 100–110 mm midline carapace length that
Authors
J. A. Daly, K. A. Buhlman, B. D. Todd, Clinton T. Moore, J. M. Peaden, T. D. Tuberville
By
Cooperative Research Units

Measuring carbon and nitrogen bioassimilation, burial, and denitrification contributions of oyster reefs in Gulf coast estuaries

The eastern oyster (Crassostrea virginica) and the reefs they create provide significant ecosystem services. This study measured their possible role in nutrient mitigation through bioassimilation, burial, and oyster-mediated sediment denitrification in near-shore shallow water (< 1 m water depth) and deep-water (> 1 m water depth) oyster reefs in Louisiana. Nitrogen (N) and carbon (C) in shell and
Authors
P. Westbrook, L. Heffner, Megan K. La Peyre
By
Cooperative Research Units

Propagation of endangered moapa dace

We report successful captive spawning and rearing of the highly endangered Moapa Dace, Moapa coriacea (approximately 650 individual fish in existence at time of this study). We simulated conditions under which this stream-dwelling southern Nevada cyprinid and similar species spawned and reared in the wild by varying temperature, photoperiod, flow, and substrate in 14 different spawning and rearing
Authors
Jack E. Ruggirello, Scott A. Bonar, Olin G. Feuerbacher, Lee H. Simons, Chelsea Powers
By
Cooperative Research Units

Modelling effects of invasive species and drought on crayfish extinction risk and population dynamics

Hydrological alteration, which may be exacerbated by climate change, is known to facilitate aquatic species invasion. Altered hydrology, invasive species, and the additive effects of these stressors pose a threat to aquatic biodiversity.Understanding extinction risk in the context of these stressors is crucial for prioritizing conservation efforts. As case studies, three narrow‐ranged endemic cray
Authors
Allyson N. Yarra, Daniel D. Magoulick
By
Cooperative Research Units