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Browse more than 160,000 publications authored by our scientists over the past 100+ year history of the USGS.  Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more.

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We are focused on some of the most significant issues society faces, and our science is making a substantial contribution to the well-being of the Nation and the world. Learn more about the major topics our research covers and the programs focused on those topics.

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Filter Total Items: 175531

Effects of temporal hydrologic shifts on the population biology of an endangered freshwater fish in a dryland river ecosystem Effects of temporal hydrologic shifts on the population biology of an endangered freshwater fish in a dryland river ecosystem

Species occupying dryland river ecosystems often experience “boom-and-bust” demographic cycles that coincide with shifts in habitat availability. Knowing whether declines are within natural thresholds versus those caused by acute human disturbance is critical for managing protected species. We investigated temporal shifts in abundance and habitat use of an endangered population of the...
Authors
Jonathan Q. Richmond, Philip Robert Gould, Jennifer Pareti, Andrew Aitken, Eric Morrissette, Adam R. Backlin, Chris Dellith, Robert N. Fisher
By
Ecosystems Mission Area, Western Ecological Research Center (WERC)

Variation in dietary ecology of two invasive American Bullfrog (Lithobates catesbeianus) populations in Southern California Variation in dietary ecology of two invasive American Bullfrog (Lithobates catesbeianus) populations in Southern California

Invasive American Bullfrogs (Lithobates catesbeianus) are a threat to native species in riparian ecosystems worldwide. They are indiscriminate predators consuming both vertebrate and invertebrate prey, negatively affecting biodiversity. Documenting the diet and feeding ecology of invasive L. catesbeianus can help management agencies identify affected species and facilitate eradication...
Authors
Nathan W. Smith, Ryan J. Hanscom, Jonathan Q. Richmond, Robert N. Fisher, Rulon W. Clark
By
Ecosystems Mission Area, Western Ecological Research Center (WERC)

Revision of ModelMuse to support the use of PEST software with MODFLOW and SUTRA models Revision of ModelMuse to support the use of PEST software with MODFLOW and SUTRA models

Executive Summary ModelMuse is a graphical user interface for several groundwater modeling programs. ModelMuse was updated to generate the input files for the parameter estimation software suite PEST. The software is used with MODFLOW or SUTRA models to run PEST-based parameter estimation and display the updated model inputs after parameter estimation. The PEST input files can also be...
Authors
Richard B. Winston
By
Water Resources Mission Area

Population genetic structure and demographic history reconstruction of introduced flathead catfish (Pylodictis olivaris) in two US Mid-Atlantic rivers Population genetic structure and demographic history reconstruction of introduced flathead catfish (Pylodictis olivaris) in two US Mid-Atlantic rivers

Population genetic analysis of invasive populations can provide valuable insights into the source of introductions, pathways for expansion, and their demographic histories. Flathead catfish (Pylodictis olivaris) are a prolific invasive species with high fecundity, long-distance dispersal, and piscivorous feeding habits that can lead to declines in native fish populations. In this study...
Authors
Justin Waraniak, Michael S. Eackles, Jason Keagy, Geoffrey D. Smith, Megan Schall, Sydney Stark, Shannon L. White, David C. Kazyak, Tyler Wagner
By
Cooperative Research Units, Pennsylvania Water Science Center

Origin of the Laurentian Great Lakes fish fauna through upward adaptive radiation cascade prior to the Last Glacial Maximum Origin of the Laurentian Great Lakes fish fauna through upward adaptive radiation cascade prior to the Last Glacial Maximum

The evolutionary histories of adaptive radiations can be marked by dramatic demographic fluctuations. However, the demographic histories of ecologically-linked co-diversifying lineages remain understudied. The Laurentian Great Lakes provide a unique system of two such radiations that are dispersed across depth gradients with a predator-prey relationship. We show that the North American...
Authors
Nathan J.C. Backenstose, Daniel J. MacGuigan, Christopher A. Osborne, Moises A. Bernal, Elizabeth K. Thomas, Eric Normandeau, Daniel L. Yule, Wendylee Stott, Amanda Susanne Ackiss, Victor A. Albert, Louis Bernatchez, Trevor J. Krabbenhoft
By
Ecosystems Mission Area, Great Lakes Science Center

Resource availability and heterogeneity affect space use and resource selection of a feral ungulate Resource availability and heterogeneity affect space use and resource selection of a feral ungulate

Animals adjust their habitat use patterns in response to changes in their physiological needs and environmental conditions. Understanding the mechanisms underlying resource selection and space use across time and space reveals effects of the environment on animals' decisions. We explored the effects of habitat availability and heterogeneity on the seasonal and annual space use and...
Authors
Saeideh Esmaeili, Kathryn A. Schoenecker, Sarah King
By
Ecosystems Mission Area, Fort Collins Science Center
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