Data

These are data collected from two types of activity sensors housed within collars deployed on female polar bears in the Chukchi and southern Beaufort Seas during the months of July through October between 1989 and 2014. Mercury tip-switches were deployed 1989 to 2009 and accelerometers were deployed 2009-2014. Activity sensor readings were related to habitats used by polar bears as described in th

Direct and indirect ecological effects of the widely used insecticide bifenthrin on stream ecosystems are largely unknown. To investigate such effects, a manipulative experiment was conducted in stream mesocosms that were colonized by aquatic insect communities and exposed to bifenthrin-contaminated sediment; implications for natural streams were interpreted through comparison of mesocosm results

The U.S Geological Survey, in cooperation with the Puerto Rico Department of Natural and Environmental Resources, completed a study to determine whether a relation exists between the extent of forest cover and the magnitude of base flow at two sets of paired drainage basins in the highlands of the municipalities of Adjuntas and Utuado within the mountainous interior of Puerto Rico. One set of pair

This data release contains spatial data for sedimentation survey of Lago Caonillas, Utuado, Puerto Rico and includes reservoir bottom contours and water depth data. The Puerto Rico Electric Power Authority (PREPA) owns and operates the Lago Caonillas reservoir, and since 1996, the reservoir has become an essential part of the Puerto Rico Aqueduct and Sewer Authority (PRASA) North Coast Superaquedu

Time series electromagnetic-induction log (TSEMIL) datasets are collected from PVC cased or uncased monitoring wells to evaluate changes in water conductivity over time. TSEMIL datasets consist of a series of individual electromagnetic-induction logs collected at a frequency of months or years that have been compiled into a dataset by eliminating small uniform offsets in bulk conductivity between

This dataset contains concentrations of 28 organochlorine pesticides, 6 polybrominated diphenyl ether (PBDE) flame retardant congeners, 3 dichlorodiphenyltrichloroethane (DDT) compounds, and 15 polychlorinated biphenyl (PCB) congeners in brain, muscle, gonad, and liver tissues of white sturgeon (Acipenser transmontanus). All concentrations are reported on a wet-weight basis. Fish samples were coll

Rainfall on 913 September 2013 triggered at least 1,138 debris flows in a 3430 km2 area of the Colorado Front Range. Most flows were triggered in response to two intense rainfall periods, one 12.5-hour-long period on 1112 September, and one 8-hour-long period on 12 September. Data in this project pertain to an area bounded by N 40.0 40.375 and W 105.25 105.625 which includes many of the areas wh

Data from 10-day sediment toxicity tests of bed sediments from the Niagara River and tributaries, Niagara and Erie County, New York. Specifically, the data was used to compare the survival and growth of two macroinvertebrate species in sediments from study sites and laboratory controls. Results are from 10-day sediment exposures of two test species, Chironomus dilutus and Hyalella azteca. Bed-sedi

Relative-gravity data and absolute-gravity data were collected in the Sierra Vista Subwatershed, Upper San Pedro Basin, Arizona, in May-June 2014 and 2015. Data from 2014 and a description of the survey network were published in USGS Open File Report 2015-1086. Data presented in the shapefile here are: 1) Network-adjusted values from 2015, 2) Gravity change from 2014 to 2015, and 3) Survey-g

This USGS Data Release represents the data used to develop multiple linear regression models for estimating the loads of total nitrogen in small streams. Recursive partitioning and random forest regression were used to assess 85 geospatial, environmental, and watershed variables across 636 small (less than 585 square kilometers) watersheds to determine which variables are fundamentally important t

This data set includes capture information and ethoxyresorufin-O-deethylase (EROD) activity results for harlequin ducks sampled during March 2011, 2013, and 2014 in western Prince William Sound, Alaska.

The purpose of these data sets was to define which samples contained antibiotic resistance genes (screened antibiotic resistance gene targets) and Vibrio species, the number of detectable targets per sample and the quantity of those respective gene targets per gram of soil. These data were determined from samples collected in the NE US in support of the Sediment-bound Contaminant Resiliency and Re