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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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How many Ciscoes are needed for stocking in the Laurentian Great Lakes? How many Ciscoes are needed for stocking in the Laurentian Great Lakes?
Historically, Cisco Coregonus artedi and deepwater ciscoes Coregonus spp. were the most abundant and ecologically important fish species in the Laurentian Great Lakes, but anthropogenic influences caused nearly all populations to collapse by the 1970s. Fishery managers have begun exploring the feasibility of restoring populations throughout the basin, but questions regarding hatchery...
Authors
Benjamin J. Rook, Michael J. Hansen, Charles R. Bronte
Transforming Palmyra Atoll to native-tree dominance will increase net carbon storage and reduce dissolved organic carbon reef runoff Transforming Palmyra Atoll to native-tree dominance will increase net carbon storage and reduce dissolved organic carbon reef runoff
Native forests on tropical islands have been displaced by non-native species, leading to calls for their transformation. Simultaneously, there is increasing recognition that tropical forests can help sequester carbon that would otherwise enter the atmosphere. However, it is unclear if native forests sequester more or less carbon than human-altered landscapes. At Palmyra Atoll, efforts...
Authors
Kate Longley-Wood, Mary Engels, Kevin D. Lafferty, John P. McLaughlin, Alex Wegmann
Dermal denticle shedding rates vary between two captive shark species Dermal denticle shedding rates vary between two captive shark species
Shark dermal scale (denticle) accumulation in the fossil record can provide information about the abundance and composition of past shark communities. Denticles are shed continuously, such that a single shark leaves a scattered composite of many isolated denticles in sediments. However, the rate of denticle shedding as well as how these rates vary among shark species with different life...
Authors
Erin M. Dillon, Anshika Bagla, Kiera D. Plioplys, Douglas J. McCauley, Kevin D. Lafferty, Aaron O’Dea
A biological condition gradient for Caribbean coral reefs: Part II. Numeric rules using sessile benthic organisms A biological condition gradient for Caribbean coral reefs: Part II. Numeric rules using sessile benthic organisms
The Biological Condition Gradient (BCG) is a conceptual model used to describe incremental changes in biological condition along a gradient of increasing anthropogenic stress. As coral reefs collapse globally, scientists and managers are focused on how to sustain the crucial structure and functions, and the benefits that healthy coral reef ecosystems provide for many economies and...
Authors
Deborah L Santavy, Susan K Jackson, Benjamin Jessup, Christina Horstmann, Caroline Rogers, Ernesto Weil, Alina Szmant, David Cuevas Miranda, Brian K Walker, Christopher F.G. Jeffrey, David Ballantine, William S. Fisher, Randy Clark, Hector Ruiz Torres, Brandi Todd, Sandy Raimondo
Perils of life on the edge: Climatic threats to global diversity patterns of wetland macroinvertebrates Perils of life on the edge: Climatic threats to global diversity patterns of wetland macroinvertebrates
Climate change is rapidly driving global biodiversity declines. How wetland macroinvertebrate assemblages are responding is unclear, a concern given their vital function in these ecosystems. Using a data set from 769 minimally impacted depressional wetlands across the globe (467 temporary and 302 permanent), we evaluated how temperature and precipitation (average, range, variability)...
Authors
Luis B. Epele, Marta G. Grech, Emilio A. Williams-Subiza, Cristina Stenert, Kyle McLean, Hamish S. Greig, Leonardo Maltchik, Mateus M. Pires, Matthew S. Bird, Aurelie Boissezon, Dani Boix, Eliane Demierre, Patricia E. García, Stephanie Gascón, Michael Jeffries, Jamie M. Kneitel, Olga Loskutov, Luz M. Manzo, Gabriela Mataloni, Musa C. Mlambo, Beat Oertli, Jordi Sala, Erica E. Scheibler, Haitao Wu, Scott A Wissinger, Darold P. Batzer
Experimental inoculation trial to determine the effects of temperature and humidity on White-nose Syndrome in hibernating bats Experimental inoculation trial to determine the effects of temperature and humidity on White-nose Syndrome in hibernating bats
Disease results from interactions among the host, pathogen, and environment. Inoculation trials can quantify interactions among these players and explain aspects of disease ecology to inform management in variable and dynamic natural environments. White-nose Syndrome, a disease caused by the fungal pathogen, Pseudogymnoascus destructans (Pd), has caused severe population declines of...
Authors
Winifred F. Frick, Emily R. Johnson, Tina L. Cheng, Julia S. Lankton, Robin Warne, Jason Dallas, Katy L. Parise, Jeffrey T. Foster, Justin G. Boyles, Liam P. McGuire
Shifting precipitation regimes alter the phenology and population dynamics of low latitude ectotherms Shifting precipitation regimes alter the phenology and population dynamics of low latitude ectotherms
Predicting how species respond to changes in climate is critical to conserving biodiversity. Modeling efforts to date have largely centered on predicting the effects of warming temperatures on temperate species phenology. In and near the tropics, the effects of a warming planet on species phenology are more likely to be driven by changes in the seasonal precipitation cycle rather than...
Authors
Erica H Henry, Adam J. Terando, William F. Morris, Jaret C. Daniels, Nick M. Haddad
Sediment sources and sealed-pavement area drive polycyclic aromatic hydrocarbon and metal occurrence in urban streams Sediment sources and sealed-pavement area drive polycyclic aromatic hydrocarbon and metal occurrence in urban streams
Metals and polycyclic aromatic hydrocarbons (PAHs) are common pollutants in urban streambed sediment, yet their occurrence is highly variable and difficult to predict. To investigate sources of PAHs and metals to streambed sediment, we sampled pavement dust, soil, and streambed sediment in 10 urban watersheds in three regions of the United States and applied a fallout-radionuclide-based...
Authors
Peter C. Van Metre, Barbara Mahler, Sharon L. Qi, Allen C. Gellis, Christopher C. Fuller, Travis S. Schmidt
Soil moisture response to seasonal drought conditions and post-thinning forest structure Soil moisture response to seasonal drought conditions and post-thinning forest structure
Prolonged drought conditions in semi-arid forests can lead to widespread vegetation stress and mortality. However, the distribution of these effects is not spatially uniform. We measured soil water potential at high spatial and temporal resolution using 112 sensors distributed across a ponderosa pine forest in northern Arizona, USA, during two abnormally dry years with below-average...
Authors
Adam Belmonte, Temuulen T. Sankey, Joel Biedermann, John B. Bradford, Thomas Kolb
Integrating distance sampling survey data with population indices to separate trends in abundance and temporary immigration Integrating distance sampling survey data with population indices to separate trends in abundance and temporary immigration
Managers rely on accurate estimators of wildlife abundance and trends for management decisions. Despite the focus of contemporary wildlife science on developing methods to improve inference from wildlife surveys, legacy datasets often rely on index counts that lack information about the detection process. Data integration can be a useful tool for combining index counts with data...
Authors
Joshua H. Schmidt, Tammy L. Wilson, William L. Thompson, Buck A. Mangipane
Eruption dynamics leading to a volcanic thunderstorm— The January 2020 eruption of Taal volcano, Philippines Eruption dynamics leading to a volcanic thunderstorm— The January 2020 eruption of Taal volcano, Philippines
Advances in global lightning detection have provided novel ways to characterize explosive volcanism. However, researchers are still at the early stages of understanding how volcanic plumes become electrified on different spatial and temporal scales. We deconstructed the phreatomagmatic eruption of Taal volcano (Philippines) on 12 January 2020 to investigate the origin of its powerful...
Authors
Alexa R. Van Eaton, Cassandra M Smith, Michael J. Pavolonis, Ryan Said
No evidence for tephra in Greenland from the historic eruption of Vesuvius in 79 CE: Implications for geochronology and paleoclimatology No evidence for tephra in Greenland from the historic eruption of Vesuvius in 79 CE: Implications for geochronology and paleoclimatology
Volcanic fallout in polar ice sheets provides important opportunities to date and correlate ice-core records as well as to investigate the environmental impacts of eruptions. Only the geochemical characterization of volcanic ash (tephra) embedded in the ice strata can confirm the source of the eruption, however, and is a requisite if historical eruption ages are to be used as valid...
Authors
Gill Plunkett, Michael Sigl, Hans Schwaiger, Emma Tomlinson, Matt Toohey, Joseph R. McConnell, Jonathan R. Pilcher, Takeshi Hasegawa, Claus Siebe