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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 65,000 articles authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Managing multiple species with conflicting needs in the Greater Everglades Managing multiple species with conflicting needs in the Greater Everglades
Given limited funding, natural resources decision making is riddled with tradeoffs, including which species or landscapes to prioritize for management action. Florida’s Everglades wetland is home to numerous indicator species, some of which are endangered. But with a multitude of species comes differing hydrologic requirements to yield appropriate foraging and breeding conditions for...
Authors
Stephanie Romanach, Saira M. Haider, Caitlin E. Hackett, Mark McKelvy, Leonard G. Pearlstine
MASTREE+: Time-series of plant reproductive effort from six continents MASTREE+: Time-series of plant reproductive effort from six continents
Significant gaps remain in understanding the response of plant reproduction to environmental change. This is partly because measuring reproduction in long-lived plants requires direct observation over many years and such datasets have rarely been made publicly available. Here we introduce MASTREE+, a data set that collates reproductive time-series data from across the globe and makes...
Authors
Andrew Hacket-Pain, Jessie Foest, Ian S. Pearse, Jalene M. LaMontagne, Walter D. Koenig, Giorgio Vacchiano, Michal Bogdziewicz, Thomas Caignard, Paulina Celebias, Joep Van Dormolen, Marcos Fernandez-Martinez, Jose V. Moris, Ciprian Palaghianu, Mario B. Pesendorfer, A. Satake, Eliane Schermer, A. Tanentzap, Peter A. Thomas, Davide Vecchio, Andreas P. Wion, T. Wohlgemuth, Tingting Xue, Katherine Abernethy, Marie-Claire Aravena Acuna, Marcelo Daniel Barrera, Jessica H. Barton, Stan Boutin, Emma R. Bush, Sergio Donoso Calderon, Felipe Carevic, Carolina Volkmer de Castilho, Juan Manuel Cellini, Colin A. Chapman, Hazel Chapman, Francesco Chianucci, Patricia da Costa, Luc Croise, Andrea Cutini, Ben Dantzer, R. Justin DeRose, Jean-Thoussaint Dikangadissi, Edmond Dimoto, Fernanda Lopes da Fonseca, Leonardo Gallo, Georg Gratzer, David F. Greene, Martin A. Hadad, Alejandro Huertas Herrera, Kathryn J. Jeffery, Jill F. Johnstone, Urs Kalbitzer, Wladyslaw Kantorowicz, Christie A. Klimas, Jonathan G. A. Lageard, Jeffrey Lane, Katharina Lapin, Mateusz Ledwon, Abigail C. Leeper, Maria Vanessa Lencinas, Ana Claudia Lira-Guedes, Michael Lordon, Paula Marchelli, Shealyn Marino, Harald Schmidt Van Marle, A. McAdam, Ludovic R. W. Momont, Manuel Nicolas, Lucia Helena de Oliveira Wadt, Parisa Panahi, Guillermo Martinez Pastur, T. Patterson, Pablo Luis Peri, Lukasz Piechnik, Mehdi Pourhashemi, Claudia Espinoza Quezada, Fidel A. Roig, Karen Pena Rojas, Yamina Micaela Rosas, Silvio Schueler, Barbara Seget, Rosina Soler, Michael A. Steele, Monica Toro-Manriquez, Caroline E. G. Tutin, Tharcisse Ukizintambara, Lee White, Biplang Yadok, John L. Willis, Anita Zolles, Magdalena Zywiec, Davide Ascoli
Genomically diverse carbapenem resistant Enterobacteriaceae from wild birds provide insight into global patterns of spatiotemporal dissemination Genomically diverse carbapenem resistant Enterobacteriaceae from wild birds provide insight into global patterns of spatiotemporal dissemination
Carbapenem resistant Enterobacteriaceae (CRE) are a threat to public health globally, yet the role of the environment in the epidemiology of CRE remains elusive. Given that wild birds can acquire CRE, likely from foraging in anthropogenically impacted areas, and may aid in the maintenance and dissemination of CRE in the environment, a spatiotemporal comparison of isolates from different...
Authors
Christina Ahlstrom, Hanna Woksepp, Linus Sandegren, Mashkoor Mohsin, Badrul Hasan, Denys Muzyka, Jorge Hernandez, Filip Aguirre, Atalay Tok, Jan Soderman, Bjorn Olsen, Andrew M. Ramey, Jonas Bonnedahl
Quantitative meta-analysis reveals no association between mercury contamination and body condition in birds Quantitative meta-analysis reveals no association between mercury contamination and body condition in birds
Mercury contamination is a major threat to the global environment, and is still increasing in some regions despite international regulations. The methylated form of mercury is hazardous to biota, yet its sublethal effects are difficult to detect in wildlife. Body condition can vary in response to stressors, but previous studies have shown mixed effects of mercury on body condition in...
Authors
Alice Carravieri, Orsolya Vincze, Paco Bustamante, Joshua T. Ackerman, Evan M. Adams, Frederic Angelier, Olivier Chastel, Yves Cherel, Olivier Gilg, Elena Golubova, Alexander Kitaysky, Katelyn Luff, Chad L. Seewagen, Hallvard Strom, Alexis P. Will, Glenn Yannic, Mathieu Giraudeau, Jerome Fort
Conterminous United States land-cover change (1985-2016): New insights from annual time series Conterminous United States land-cover change (1985-2016): New insights from annual time series
Sample-based estimates augmented by complete coverage land-cover maps were used to estimate area and describe patterns of annual land-cover change across the conterminous United States (CONUS) between 1985 and 2016. Most of the CONUS land cover remained stable in terms of net class change over this time, but a substantial gross change dynamic was captured by the annual and cumulative...
Authors
Roger F. Auch, Danika Fay Wellington, Janis L. Taylor, Stephen V. Stehman, Heather J. Tollerud, Jesslyn F. Brown, Thomas Loveland, Bruce Pengra, Josephine Horton, Zhe Zhu, Alemayehu Midekisa, Kristi L. Sayler, George Z. Xian, Christopher Barnes, Ryan R. Reker
Effects of seasonal hypoxia on macroinvertebrate communities in a small reservoir Effects of seasonal hypoxia on macroinvertebrate communities in a small reservoir
Localized hypoxia can reduce available habitat, restrict movement and limit the abundance of aquatic invertebrates. Cultural eutrophication coupled with the effects of climate change is likely to increase the frequency and extent of hypoxia in aquatic ecosystems, yet little is known about how oxygen gradients in small reservoirs influence spatial distribution and abundance of aquatic...
Authors
David O. Lucchesi, Steven R. Chipps, David A. Schumann
Hydrologic modification and channel evolution degrades connectivity on the Atchafalaya River floodplain Hydrologic modification and channel evolution degrades connectivity on the Atchafalaya River floodplain
The Atchafalaya River Basin is the largest remaining forested wetland in the contiguous United States. Since 1960, dredging and channel erosion in the Basin have resulted in changes to the hydrologic connectivity that have not been quantified. Analyses were conducted to determine the hydraulic and geomorphic factors that have changed since discharge became controlled that may have...
Authors
Daniel Kroes, Charles R Demas, Yvonne A. Allen, Richard Day, Steve W Roberts, Jeff Varisco
Premature mortality observations among Alaska’s Pacific salmon during record heat and drought in 2019 Premature mortality observations among Alaska’s Pacific salmon during record heat and drought in 2019
Widespread mortality of Pacific salmon Oncorhynchus spp. returning to spawn in Alaska coincided with record-breaking air temperatures and prolonged drought in summer 2019. Extreme environmental conditions are expected to happen more frequently with rapid climate change and challenge the notion that Alaska could indefinitely provide abundant, cool freshwater habitat for Pacific salmon. A...
Authors
Vanessa R. von Biela, Christopher J. Sergeant, Michael P. Carey, Zachary Liller, Charles M. Russell, Stephanie Quinn-Davidson, Peter S. Rand, P. A. H. Westley, Christian E. Zimmerman
Molecular mechanisms of solid bitumen and vitrinite reflectance suppression explored using hydrous pyrolysis of artificial source rock Molecular mechanisms of solid bitumen and vitrinite reflectance suppression explored using hydrous pyrolysis of artificial source rock
The most commonly used parameter for thermal maturity calibration in basin modelling is mean random vitrinite reflectance (Ro). However, Ro suppression has been noted in samples containing a high proportion of liptinite macerals. This phenomenon has been demonstrated empirically using hydrous pyrolysis of artificial source rock containing various proportions of thermally immature Wyodak...
Authors
Margaret M. Sanders, Aaron M. Jubb, Paul C. Hackley, Kenneth E. Peters
Integration of vegetation classification with land cover mapping: Lessons from regional mapping efforts in the Americas Integration of vegetation classification with land cover mapping: Lessons from regional mapping efforts in the Americas
Aims: Natural resource management and biodiversity conservation rely on inventories of vegetation that span multiple management or political jurisdictions. However, while remote sensing data and analytical tools have enabled production of maps at increasing spatial resolution and reliability, there are limited examples where national or continental-scaled maps are produced to represent...
Authors
Patrick J. Comer, Jon C Hak, Daryn Dockter, Jim Smith
High abundance of a single taxon (amphipods) predicts aquatic macrophyte biodiversity in prairie wetlands High abundance of a single taxon (amphipods) predicts aquatic macrophyte biodiversity in prairie wetlands
Conservation programs often aim to protect the abundance of individual species and biodiversity simultaneously. We quantified relations between amphipod densities and aquatic macrophyte (large plants and algae) diversity to test a hypothesis that biodiversity can support high abundance of a single taxonomic group. Amphipods (Gammarus lacustris and Hyalella azteca) are key forage for...
Authors
Danelle M. Larson, Demmey DeJong, Michael J. Anteau, Megan J. Fitzpatrick, Breanna R. Keith, Emily G. Schilling, Barry Thoele
Genetic assignment of fisheries bycatch reveals disproportionate mortality among Alaska Northern Fulmar breeding colonies Genetic assignment of fisheries bycatch reveals disproportionate mortality among Alaska Northern Fulmar breeding colonies
Global fisheries kill millions of seabirds annually through bycatch, but little is known about population-level impacts, particularly in species that form metapopulations. U.S. North Pacific groundfish fisheries catch thousands of Northern Fulmars (Fulmarus glacialis rodgersii) each year, making fulmars the most frequently caught seabird in federally managed U.S. fisheries. Here, we used...
Authors
Diana S. Baetscher, Jessie Beck, Eric C. Anderson, Kristen Ruegg, Andrew M. Ramey, Scott Hatch, HannahRose M. Nevins, Shannon Fitzgerald, J Carlos Garza