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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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Consequences of migratory coupling of predators and prey when mediated by human actions Consequences of migratory coupling of predators and prey when mediated by human actions

Aim Animal migrations influence ecosystem structure, dynamics and persistence of predator and prey populations. The theory of migratory coupling postulates that aggregations of migrant prey can induce large-scale synchronized movements in predators, and this coupling is consequential for the dynamics of ecological communities. The degree to which humans influence these interactions...
Authors
Navinder J. Singh, Fraucke Ecke, Todd E. Katzner, Sumanta Bagchi, Per Sandstrom, Birger Hornfeldt

Translational invasion ecology: Bridging research and practice to address one of the greatest threats to biodiversity Translational invasion ecology: Bridging research and practice to address one of the greatest threats to biodiversity

Effective natural resource management and policy is contingent on information generated by research. Conversely, the applicability of research depends on whether it is responsive to the needs and constraints of resource managers and policy makers. However, many scientific fields including invasion ecology suffer from a disconnect between research and practice. Despite strong socio...
Authors
Toni Lyn Morelli, Carrie Brown-Lima, Jenica M. Allen, Evelyn M. Beaury, Emily J. Fusco, Audrey Barker-Plotkin, Brittany B. Laginhas, Brendan Quirion, Bridget Griffin, Blair McLaughlin, Lara Munro, Nancy Olmstead, Julie Richburg, Bethany A. Bradley

Evaluating corticosterone as a biomarker for amphibians exposed to increased salinity and ambient corticosterone Evaluating corticosterone as a biomarker for amphibians exposed to increased salinity and ambient corticosterone

Physiological biomarkers are commonly used to assess the health of taxa exposed to natural and anthropogenic stressors. Glucocorticoid (GC) hormones are often used as indicators of physiological stress in wildlife because they affect growth, reproduction and survival. Increased salinity from human activities negatively influences amphibians and their corticosterone (CORT; the main...
Authors
Brian J. Tornabene, Blake R. Hossack, Erica J Crespi, Creagh W Breuner

The petrologic and degassing behavior of sulfur and other magmatic volatiles from the 2018 eruption of Kīlauea, Hawaiʻi: Melt concentrations, magma storage depths, and magma recycling The petrologic and degassing behavior of sulfur and other magmatic volatiles from the 2018 eruption of Kīlauea, Hawaiʻi: Melt concentrations, magma storage depths, and magma recycling

Kīlauea Volcano’s 2018 lower East Rift Zone (LERZ) eruption produced exceptionally high lava effusion rates and record-setting SO2 emissions. The eruption involved a diverse range of magmas, including primitive basalts sourced from Kīlauea’s summit reservoirs. We analyzed LERZ matrix glasses, melt inclusions, and host minerals to identify melt volatile contents and magma storage depths...
Authors
Allan Lerner, Paul J. Wallace, Thomas Shea, Adrien Mourey, Peter J. Kelly, Patricia A. Nadeau, Tamar Elias, Christoph Kern, Laura E. Clor, Cheryl Gansecki, R. Lopaka Lee, Lowell Moore, Cynthia A. Werner

Active Mars: A dynamic world Active Mars: A dynamic world

Mars exhibits diverse surface changes at all latitudes and all seasons. Active processes include impact cratering, aeolian sand and dust transport, a variety of slope processes, changes in polar ices, and diverse effects of seasonal CO2 frost. The extent of surface change has been surprising and indicates that the present climate is capable of reshaping the surface. Activity has...
Authors
Colin M. Dundas, Patricio Becerra, Shane Byrne, Matthew Chojnacki, Ingrid J. Daubar, Serina Diniega, Candice J. Hansen, Kenneth E. Herkenhoff, Margaret E. Landis, Alfred S. McEwen, Ganna Portyankina, Adomas Valantinas

Vulnerability of Pacific salmon to invasion of northern pike (Esox lucius) in Southcentral Alaska Vulnerability of Pacific salmon to invasion of northern pike (Esox lucius) in Southcentral Alaska

The relentless role of invasive species in the extinction of native biota requires predictions of ecosystem vulnerability to inform proactive management strategies. The worldwide invasion and range expansion of predatory northern pike (Esox lucius) has been linked to the decline of native fishes and tools are needed to predict the vulnerability of habitats to invasion over broad...
Authors
Chase S. Jalbert, Jeffrey A. Falke, Andres Lopez, Kristine J. Dunker, Adam Sepulveda, Peter A. H. Westley

The distribution and structure of mangroves (Avicennia germinans and Rhizophora mangle) near a rapidly changing range limit in the northeastern Gulf of Mexico The distribution and structure of mangroves (Avicennia germinans and Rhizophora mangle) near a rapidly changing range limit in the northeastern Gulf of Mexico

In coastal wetlands, one of the most striking examples of climate change is the poleward range expansion of mangrove forests in response to warming winters. In North America, the Cedar Key region has often been considered the range limit for mangroves along the western coast of Florida (USA). However, within the past several decades, robust stands of Avicennia germinans and Rhizophora...
Authors
Caitlin M. Snyder, Laura Feher, Michael Osland, Christopher J. Miller, A. Randall Hughes, Karen L Cummins

Earthquake source mechanisms and stress field variations associated with wastewater-induced seismicity in southern Kansas, USA Earthquake source mechanisms and stress field variations associated with wastewater-induced seismicity in southern Kansas, USA

The strong increase of seismicity rates in the contiguous USA over the last 10 years is linked to the injection of huge amounts of wastewater from oil and gas production in unconventional hydrocarbon reservoirs. We calculated 549 moment tensors of induced earthquakes (MW ≤ 4.9) in southern Kansas to study their source mechanisms and their relation to injection activity. Seventeen percent...
Authors
Amandine Amemotou, Patricia Martinez-Garzon, Grzegorz Kwiatek, Justin Rubinstein, Marco Bohnhoff

Insights on geochemical, isotopic, and volumetric compositions of produced water from hydraulically fractured Williston Basin oil wells Insights on geochemical, isotopic, and volumetric compositions of produced water from hydraulically fractured Williston Basin oil wells

Tracing produced water origins from wells hydraulically fractured with freshwater-based fluids is sometimes predicated on assumptions that (1) each geological formation contains compositionally unique brine and (2) produced water from recently hydraulically fractured wells resembles fresher meteoric water more so than produced water from older wells. These assumptions are not valid in...
Authors
Tanya J. Gallegos, Colin A. Doolan, Rodney R. Caldwell, Mark A Engle, Matthew S. Varonka, Justin E. Birdwell, Glenn D. Jolly, Tyler B. Coplen, Thomas A. Oliver

What is the effect of poaching activity on wildlife species? What is the effect of poaching activity on wildlife species?

Poaching is a pervasive threat to wildlife, yet quantifying the direct effect of poaching on wildlife is rarely possible because both wildlife and threat data are infrequently collected concurrently. In this study, we used poaching data collected through the Management Information System (MIST) and wildlife camera trap data collected by the Tropical Ecology Assessment and Monitoring...
Authors
Jennifer F. Moore, Eustrate Uzabaho, Abel Musana, Prosper Uwingell, James E. Hines, James D. Nichols

Predicting water temperature dynamics of unmonitored lakes with meta-transfer learning Predicting water temperature dynamics of unmonitored lakes with meta-transfer learning

Most environmental data come from a minority of well-monitored sites. An ongoing challenge in the environmental sciences is transferring knowledge from monitored sites to unmonitored sites. Here, we demonstrate a novel transfer-learning framework that accurately predicts depth-specific temperature in unmonitored lakes (targets) by borrowing models from well-monitored lakes (sources)...
Authors
Jared Willard, Jordan Read, Alison P. Appling, Samantha K. Oliver, Xiaowei Jia, Vipin Kumar

Exploring GPS observations of postseismic deformation following the 2012 MW7.8 Haida Gwaii and 2013 MW7.5 Craig, Alaska Earthquakes: Implications for viscoelastic Earth structure Exploring GPS observations of postseismic deformation following the 2012 MW7.8 Haida Gwaii and 2013 MW7.5 Craig, Alaska Earthquakes: Implications for viscoelastic Earth structure

The Queen Charlotte-Fairweather Fault (QC-FF) system off the coast of British Columbia and southeast Alaska is a highly active dextral strike-slip plate boundary that accommodates ∼50 mm/yr of relative motion between the Pacific and North America plates. Nine MW ≥ 6.7 earthquakes have occurred along the QC-FF system since 1910, including a MS(G-R)8.1 event in 1949. Two recent earthquakes...
Authors
Katherine A. Guns, Frederick Pollitz, Thorne Lay, Han Yue
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