Reports
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 82,000 reports authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
Filter Total Items: 84795
Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Midwest Regional Information Sheet Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Midwest Regional Information Sheet
This is one in a series of eight, geographic region-focused information sheets that summarizes documented changes in plant and animal phenology over the past century across the United States. This summary is based on long-term studies (10 years or more) published in the primary scientific literature since 2001. A forthcoming manuscript synthesizes the findings of the eight regional...
Authors
Stacey A. Leicht-Young, Carolyn A.F. Enquist, Jake F. Weltzin
Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Hawaii and Pacific Islands Regional Information Sheet Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Hawaii and Pacific Islands Regional Information Sheet
This is one in a series of eight, geographic region-focused information sheets that summarizes documented changes in plant and animal phenology over the past century across the United States. This summary is based on long-term studies (10 years or more) published in the primary scientific literature since 2001. A forthcoming manuscript synthesizes the findings of the eight regional...
Authors
Stacey A. Leicht-Young, Carolyn A.F. Enquist, Jake F. Weltzin
Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Northeast Regional Information Sheet Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Northeast Regional Information Sheet
This is one in a series of eight, geographic region-focused information sheets that summarizes documented changes in plant and animal phenology over the past century across the United States. This summary is based on long-term studies (10 years or more) published in the primary scientific literature since 2001. A forthcoming manuscript synthesizes the findings of the eight regional...
Authors
Stacey A. Leicht-Young, Carolyn A.F. Enquist, Jake F. Weltzin
Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Southwest Regional Information Sheet Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Southwest Regional Information Sheet
This is one in a series of eight, geographic region-focused information sheets that summarizes documented changes in plant and animal phenology over the past century across the United States. This summary is based on long-term studies (10 years or more) published in the primary scientific literature since 2001. A forthcoming manuscript synthesizes the findings of the eight regional...
Authors
Stacey A. Leicht-Young, Carolyn A.F. Enquist, Jake F. Weltzin
Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Alaska and the Arctic Regional Information Sheet Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Alaska and the Arctic Regional Information Sheet
This is one in a series of eight, geographic region-focused information sheets that summarizes documented changes in plant and animal phenology over the past century across the United States. This summary is based on long-term studies (10 years or more) published in the primary scientific literature since 2001. A forthcoming manuscript synthesizes the findings of the eight regional...
Authors
Stacey A. Leicht-Young, Carolyn A.F. Enquist, Jake F. Weltzin
Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Southeast Regional Information Sheet Observed changes in phenology across the USA: A regional review for the 2013 National Climate Assessment, Southeast Regional Information Sheet
This is one in a series of eight, geographic region-focused information sheets that summarizes documented changes in plant and animal phenology over the past century across the United States. This summary is based on long-term studies (10 years or more) published in the primary scientific literature since 2001. A forthcoming manuscript synthesizes the findings of the eight regional...
Authors
Stacey A. Leicht-Young, Carolyn A.F. Enquist, Jake F. Weltzin
Urchins (Stronglyocentrotus spp.): Section 4.6 Urchins (Stronglyocentrotus spp.): Section 4.6
Summary Increased ocean temperature in combination with changes in ocean currents may cause urchin populations to expand or be replaced by another species. Increases in ocean acidity, hypercapnia, and decreasing carbonate mineral saturation are intricately linked and have been shown to have negative impacts on all urchin life stages (pelagic larvae, juveniles and adults). Hypoxia is...
Authors
Nancy E. Elder
Vegetation classification and mapping, Vicksburg National Military Park, Mississippi Vegetation classification and mapping, Vicksburg National Military Park, Mississippi
Executive Summary The National Park Service (NPS) Gulf Coast Inventory and Monitoring Network, with the support of the National Park Service Vegetation Inventory completed vegetation classification and mapping for Vicksburg National Military Park (VICK), in Warren County, Mississippi, from 2004 to 2010. VICK is one of more than 250 NPS units to be covered by the Vegetation Inventory...
Authors
Chris Lea, Robert G. Waltermire, Carl Nordman
Arsenic concentrations, related environmental factors, and the predicted probability of elevated arsenic in groundwater in Pennsylvania Arsenic concentrations, related environmental factors, and the predicted probability of elevated arsenic in groundwater in Pennsylvania
Analytical results for arsenic in water samples from 5,023 wells obtained during 1969–2007 across Pennsylvania were compiled and related to other associated groundwater-quality and environmental factors and used to predict the probability of elevated arsenic concentrations, defined as greater than or equal to 4.0 micrograms per liter (µg/L), in groundwater. Arsenic concentrations of 4.0...
Authors
Eliza L. Gross, Dennis J. Low
Effects of Chiloquin Dam on spawning distribution and larval emigration of Lost River, shortnose, and Klamath largescale suckers in the Williamson and Sprague Rivers, Oregon Effects of Chiloquin Dam on spawning distribution and larval emigration of Lost River, shortnose, and Klamath largescale suckers in the Williamson and Sprague Rivers, Oregon
Chiloquin Dam was constructed in 1914 on the Sprague River near the town of Chiloquin, Oregon. The dam was identified as a barrier that potentially inhibited or prevented the upstream spawning migrations and other movements of endangered Lost River (Deltistes luxatus
Authors
Barbara A. Martin, David A. Hewitt, Craig M. Ellsworth
Nearshore thermal gradients of the Colorado River near the Little Colorado River confluence, Grand Canyon National Park, Arizona, 2010 Nearshore thermal gradients of the Colorado River near the Little Colorado River confluence, Grand Canyon National Park, Arizona, 2010
Construction and operation of Glen Canyon Dam has dramatically impacted the flow of the Colorado River through Glen, Marble, and Grand Canyons. Extremes in both streamflow and water temperature have been suppressed by controlled releases from the dam. Trapping of sediment in Lake Powell, the reservoir formed by Glen Canyon Dam, has also dramatically reduced the supply of suspended...
Authors
Rob Ross, Paul E. Grams
Concentrations of chloride and sodium in groundwater in New Hampshire from 1960 through 2011 Concentrations of chloride and sodium in groundwater in New Hampshire from 1960 through 2011
Several studies from the 1970s and more recently (for example, Hall (1975), Daley and others (2009) and Mullaney (2009)) have found that concentrations of chloride and sodium in groundwater in New Hampshire have increased during the past 50 years. Increases likely are related to road salt and other anthropogenic sources, such as septic systems, wastewater, and contamination from...
Authors
Laura Medalie