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Zinc concentrations and isotopic signatures of an aquatic insect (mayfly, Baetis tricaudatus)

Insect metamorphosis often results in substantial chemical changes that can fractionate isotopes and alter contaminant concentrations. We exposed larval mayflies (Baetis tricaudatus) to an aqueous zinc gradient (3-340 g Zn/l) and measured the change in zinc tissue concentrations at different stages of metamorphosis. We also measured changes in stable isotopes (δ15N and δ13C) in unexposed...

Water-quality and streamflow datasets used in the Weighted Regressions on Time, Discharge, and Season (WRTDS) models to determine trends in the Nations rivers and streams, 1972-2012

In 1991, the U.S. Geological Survey (USGS) began a study of more than 50 major river basins across the Nation as part of the National Water-Quality Assessment (NAWQA) project of the National Water-Quality Program. One of the major goals of the NAWQA project is to determine how water-quality conditions change over time. To support that goal, long-term consistent and comparable monitoring...

Carpinteria Salt Marsh Habitat Polygons

We identified five common habitat types in Carpinteria Salt Marsh: channels, pans (flats), marsh, salt flat and upland. We then drew polygons around each habitat type identified from a registered and orthorectified aerial photograph and created a GIS shapefile. Polygons were ground-truthed in the field. From these habitat polygons, one can use GIS applications to estimate the area of...

Digital Database and Maps of Quaternary Deposits in East and Central Siberia

This digital database is the product of collaboration between the U.S. Geological Survey, the Alfred Wegener Institute for Polar and Marine Research Potsdam, Foothill College GeoSpatial Technology Certificate Program, and the Geophysical Institute at the University of Alaska. The primary goal for creating this digital database is to enhance current estimates of organic carbon stored in...

Exposure potential of salt marsh units in Edwin B. Forsythe National Wildlife Refuge to environmental health stressors

Natural and anthropogenic contaminants, pathogens, and viruses are found in soils and sediments throughout the United States. Enhanced dispersion and concentration of these environmental health stressors in coastal regions can result from sea level rise and storm-derived disturbances. The combination of existing environmental health stressors and those mobilized by natural or...

Data for comparison of climate envelope models developed using expert-selected variables versus statistical selection

Climate envelope models are increasingly used to characterize potential future distribution of species under climate change scenarios. It is acknowledged that the use of climate envelope models comes with both strengths and limitations, and that results are sensitive to modeling assumptions, inputs, and specific methods. The selection of predictor variables, an integral modeling step, is...

Body size estimates for slider turtles in the United States, 1944-2010Data

These data are compiled from published studies of various subspecies of the slider turtle (Trachemys scripta) from throughout the native range of the species in the United States. Data include sample sizes of adult male and female turtles as well as various estimates of their body size as noted in the Comments column. The purpose for collecting these data was to make comparisons and...

Data collected for Claiborne aquifer study in southwestern Georgia during 2015 to 2016

A 72-hour constant-discharge aquifer test was performed at the University of Georgia Stripling Irrigation Research Park, Mitchell County, Georgia, in order to assess the potential of the Claiborne aquifer as a source of water for irrigation supply. At the Stripling site the Claiborne aquifer is 260 feet thick. Between the Claiborne aquifer and the overlying Upper Floridan aquifer is the...

Dataset for Alaska Marine Fish Ecology Catalog

This collection of GIS layers was prepared for the report Alaska Arctic Marine Fish Ecology Catalog (U.S. Geological Survey Scientific Investigations Report 20165038). The layers display geographic distribution and sampling locations for Arctic marine fish species in the region of United States sectors of the Chukchi and Beaufort Seas. Certain diadromous species (for example, Pacific...

Klamath River Water-Quality Sites

Klamath River water-quality monitoring -- Keno Reach monitors

Groundwater-Quality Data in the Tule-Tulare-Highlands-Kaweah Shallow Aquifer Study Unit, 2014-2015

The U.S. Geological Survey collected groundwater samples from 95 domestic wells in Tulare and Kings Counties, California in 2014-2015. The wells were sampled for the Tulare Shallow Aquifer Study Unit of the California State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin Projects assessment of the quality of groundwater resources...

Continuous monitoring and discrete water-quality data from groundwater wells in the Edwards aquifer, Texas, 201415

In cooperation with the San Antonio Water System, continuous and discrete water-quality data were collected from groundwater wells completed in the Edwards aquifer, Texas, 2014-2015. Discrete measurements of nitrate were made by using a nitrate sensor. Precipitation data from two sites in the National Oceanic and Atmospheric Administration Global Historical Climatology Network are...
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