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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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Microfossil biostratigraphy and paleoenvironments of Cretaceous and Pliocene sediments along Greens Mill Run, North Carolina, USA Microfossil biostratigraphy and paleoenvironments of Cretaceous and Pliocene sediments along Greens Mill Run, North Carolina, USA
Cretaceous sediments are disconformably overlain by Pliocene sediments along the banks of Greens Mill Run, Greenville, North Carolina, located in the central coastal plain. The Cretaceous sediments, composed of glauconitic sand and clay, have previously been informally considered part of the Maastrichtian Peedee Formation. The Pliocene sediments are assigned to the Yorktown Formation and...
Authors
Mikayla Dixon, Stephen J. Culver, David J. Mallinson, Brian T. Huber, Jean Self-Trail, Whittney Spivey, W. Burleigh Harris
Salt marsh habitats and diamondback terrapins in a rapidly changing climate: A review Salt marsh habitats and diamondback terrapins in a rapidly changing climate: A review
The impacts associated with global climate change (e.g., sea-level rise, tropical storms, and warming temperatures) are expected to alter predator–prey interactions, foundation species, and plant community structure in coastal ecosystems. While the complex dynamics of these habitats have been examined under future climate predictions, few ecosystem models incorporate influences from...
Authors
Margaret M. Lamont, Michael J. Osland, Melissa M. Baustian
Neonatal antipredator tactics shape female movement patterns in large herbivores Neonatal antipredator tactics shape female movement patterns in large herbivores
Caring for newborn offspring hampers resource acquisition of mammalian females, curbing their ability to meet the high energy expenditure of early lactation. Newborns are particularly vulnerable, and large herbivores have evolved a continuum of neonatal anti-predator tactics, ranging from immobile hider to highly mobile follower offspring. How these tactics constrain female movements...
Authors
Kamal Atmeh, Christophe Bonenfant, Jean-Michel Gaillard, Mathieu Garel, A.J. Mark Hewison, Pascal Marchand, Nicolas Morellet, Pia Anderwald, Bayarbaatar Buuveibaatar, Jeffrey L. Beck, Matthew S. Becker, Floris M. van Beest, Jodi Berg, Ulrika A. Bergvall, Randall B. Boone, Mark S. Boyce, Simon Chamaill'e-Jammes, Yannick Chaval, Chimeddorj Buyanaa, David A Christianson, Simone Ciuti, Steeve D. Côté, Duane R. Diefenbach, Egil Droge, Johan T. Du Toit, Samantha P. Dwinnell, Julian Fennessy, Flurin Filli, Daniel Fortin, Emma E. Hart, Matthew Hayes, Mark Hebblewhite, Morten Heim, Ivar Herfindal, Marco Heurich, Christian von Hoermann, Katey Huggler, Craig Jackson, Andrew F. Jakes, Paul F. Jones, Petra Kaczensky, Matthew J. Kauffman, Petter Kjellander, Tayler N LaSharr, Leif Egil Loe, Roel May, Philip McLoughlin, Erling L. Meisingset, Evelyn Merrill, Kevin L. Monteith, Thomas Mueller, Atle Mysterud, Dejid Nandintsetseg, Kirk A. Olson, John Payne, Scott Pearson, Ashild Ønvik Pedersen, Dustin H. Ranglack, Adele K. Reinking, Thomas Rempfler, Clifford G Rice, Eivin Røskaft, Bernt-Erik Sæther, Sonia Saïd, Hugo Santacreu, Niels Martin Schmidt, Daan Smit, Jared A. Stabach, Martin-Hugues St-Laurent, Joëlle Taillon, W. David Walter, Kevin White, Guillaume Péron, Anne Loison
Longitudinal and seasonal changes of organic matter sources through a semi-arid river-reservoir system Longitudinal and seasonal changes of organic matter sources through a semi-arid river-reservoir system
The quality and quantity of organic matter (OM) in a river system directly affects ecosystem health; thus, managers benefit from an in-depth understanding of the drivers and sources of OM. In the Snake River, a highly altered river-reservoir system in the semi-arid western United States, OM production and loading are key drivers of reservoir anoxia, which leads to several deleterious...
Authors
Alysa Muir Yoder, Austin K. Baldwin, Mark C. Marvin-DiPasquale, Brett Poulin, Jesse Naymik, David P. Krabbenhoft
Increasing soil water drought in response to altered precipitation timing across the western United States Increasing soil water drought in response to altered precipitation timing across the western United States
Recent trends of rising temperatures and longer droughts between precipitation events are impacting water-limited dryland ecosystems in the western United States. Although ecosystem drought response depends directly on soil moisture, trends in soil moisture (e.g., edaphic drought) remain more poorly explored than precipitation (e.g., meteorological drought), representing an important...
Authors
Fangyue Zhang, Joel A. Biederman, Daniel Rodolphe Schlaepfer, John B. Bradford, Sasha C. Reed, William K. Smith
Dryland fungi are spatially heterogeneous and resistant to global change drivers Dryland fungi are spatially heterogeneous and resistant to global change drivers
Fungi are considered particularly important in regulating the structure and function of dryland ecosystems, yet the response of dryland fungal communities to global change remains notably understudied. Without a clear understanding of how fungi respond to global change drivers, mitigation plans—required for biodiversity and ecosystem service conservation and restoration—are impossible to...
Authors
Andrea Lopez, Mark Anthony, Jovani Catalan-Dibene, Scott Ferrenberg, Samuel E. Jordan, Brooke B. Osborne, Sasha C. Reed, Adriana L. Romero-Olivares
Assessing the sustainability of Pacific walrus harvest in a changing environment Assessing the sustainability of Pacific walrus harvest in a changing environment
Harvest sustainability is a primary goal of wildlife management and conservation, and in a changing world, it is increasingly important to consider environmental drivers of population dynamics alongside harvest in cohesive management plans. This is particularly pertinent for harvested species that acutely experience effects of climate change. The Pacific walrus (Odobenus rosmarus...
Authors
Devin L. Johnson, Joseph Michael Eisaguirre, Rebecca L. Taylor, Erik M. Andersen, Joel L. Garlich-Miller
The dynamics of sea otter prey selection under population growth and expansion The dynamics of sea otter prey selection under population growth and expansion
Sea otters (Enhydra lutris) were extirpated from much of their range in the North Pacific by the early 1900s but have made a remarkable recovery in Southeast Alaska. Sea otter populations have been particularly successful in Glacier Bay, Alaska, a protected tidewater glacier fjord with a diverse and productive nearshore habitat. Collection of sea otter foraging observations in Glacier...
Authors
Clint Leach, Ben Weitzman, Jim Bodkin, Daniel Esler, George G. Esslinger, Kimberly A. Kloecker, Daniel Monson, Jamie N. Womble, Mevin B. Hooten
The joint effect of changes in urbanization and climate on trends in floods: A comparison of panel and single-station quantile regression approaches The joint effect of changes in urbanization and climate on trends in floods: A comparison of panel and single-station quantile regression approaches
Estimates of annual maximum (peak) flow quantiles are needed for basins undergoing changes in both urbanization and climate. Most previous work on the effect of urbanization on peak flows has considered urbanization alone and only the spatial variation in flood quantiles or its mean temporal effect, and most work on the effect of nonstationarity in climate has focused on single-station...
Authors
Thomas M. Over, Mackenzie K. Marti, Jaqueline Ortiz, Hannah Lee Podzorski
Food-web dynamics of a floodplain mosaic overshadow the effects of engineered logjams for Pacific salmon and steelhead Food-web dynamics of a floodplain mosaic overshadow the effects of engineered logjams for Pacific salmon and steelhead
Food webs vary in space and time. The structure and spatial arrangement of food webs are theorized to mediate temporal dynamics of energy flow, but empirical corroboration in intermediate-scale landscapes is scarce. River-floodplain landscapes encompass a mosaic of aquatic habitat patches and food webs, supporting a variety of aquatic consumers of conservation concern. How the structure...
Authors
James C. Paris, Colden V. Baxter, James R Bellmore, Joseph R. Benjamin
Influenza A virus antibodies in ducks and introduction of highly pathogenic influenza A(H5N1) virus, Tennessee, USA Influenza A virus antibodies in ducks and introduction of highly pathogenic influenza A(H5N1) virus, Tennessee, USA
Testing of ducks in Tennessee, United States, before introduction of highly pathogenic influenza A(H5N1) virus demonstrated a high prevalence of antibodies to influenza A virus but very low prevalence of antibodies to H5 (25%) or H5 and N1 (13%) subtypes. Antibody prevalence increased after H5N1 introduction.
Authors
David Stallknect, Deborah Carter, Abigail Blake-Bradshaw, Nicholas M. Masto, Cory Highway, Jamie Feddersen, Richard J. Webby, Bradley S. Cohen, Jeffery D. Sullivan, Rebecca L. Poulson
Restoration treatments enhance tree growth and alter climatic constraints during extreme drought Restoration treatments enhance tree growth and alter climatic constraints during extreme drought
The frequency and severity of drought events are predicted to increase due to anthropogenic climate change, with cascading effects across forested ecosystems. Management activities such as forest thinning and prescribed burning, which are often intended to mitigate fire hazard and restore ecosystem processes, may also help promote tree resistance to drought. However, it is unclear...
Authors
Kyle C. Rodman, John B. Bradford, Alicia M. Formanack, Peter Z. Fulé, David W. Huffman, Thomas E. Kolb, Ana T. Miller-ter Kuile, Donald P. Normandin, Kiona Ogle, Rory J. Pederson, Daniel Rodolphe Schlaepfer, Michael T. Stoddard, Amy E.M. Waltz