Data
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Oregon Spotted Frog Monitoring at Jack Creek 2015-2016 Oregon Spotted Frog Monitoring at Jack Creek 2015-2016
This dataset contains information from mark-recapture and egg mass surveys conducted 2015-2016 by USGS as part of an ongoing Oregon spotted frog (Rana pretiosa) monitoring effort at Jack Creek, Klamath County, Oregon. Data consist of spotted frog counts aggregated by date, location, life stage, and sex, as well as data on environmental conditions at the time each survey.
Data and source code from "Estimating inbreeding rates in natural populations: addressing the problem of incomplete pedigrees" Data and source code from "Estimating inbreeding rates in natural populations: addressing the problem of incomplete pedigrees"
We used Monte Carlo simulations to compare properties of the two estimators and determine their utility for empirical analyses. Simulations were performed using idealized populations that were tracked over 15 generations. Separate simulations were performed using generation sizes of 100 individuals (50 male and 50 females) or 20 individuals (10 males and 10 females). In each generation...
Fluctuating asymmetry in waterbirds in relation to mercury exposure Fluctuating asymmetry in waterbirds in relation to mercury exposure
The dataset includes the bird species, sex, mercury concentration in breast feathers and whole blood, and the composite measure of fluctuating asymmetry. Statistical models were developed for each species to analyze the relationship between mercury exposure in either breast feathers or whole blood and the composite measure of fluctuating asymmetry, while accounting for the sex of each...
Bullet fragments in Belding's ground squirrels in Oregon and California in 2014-2015 Bullet fragments in Belding's ground squirrels in Oregon and California in 2014-2015
The dataset includes specifics on fragments of bullets recovered from shot Belding's ground squirrels from Oregon and California. Ground squirrels were radiographed and then we used ImageJ software to count and measure the area of those bullet fragments. A subset of shot carcasses were then digested and bullet fragments were recovered. Statistical models were developed to predict either...
Total Mercury Concentrations in Fish Muscle from the Colorado River and Bright Angel Creek, AZ, USA (2015) Total Mercury Concentrations in Fish Muscle from the Colorado River and Bright Angel Creek, AZ, USA (2015)
Mercury is a globally distributed pollutant that threatens human and ecosystem health. Even protected areas, such as national parks, are subjected to mercury contamination because it is delivered via atmospheric deposition, often after long-range transport. In aquatic ecosystems, certain environmental conditions can promote microbial processes that convert inorganic mercury to an organic...
Mercury Exposure in Piscivorous Birds at the Carson River (NV) Superfund Site, 1997-2006 Mercury Exposure in Piscivorous Birds at the Carson River (NV) Superfund Site, 1997-2006
The persistence and degree of mercury contamination of the lower Carson River system (LCRS) have led to placement of a portion of the Carson River Basin (including Lahontan Reservoir) on the US. Environmental Protection Agency (EPA) National Priorities List ("Superfund") for research and cleanup. The potential toxicity of mercury concentrations within the LCRS to piscivorous birds (snowy...
Stream Segments Captures and Crossings Associated With 2012 Aquatic Organism Passage Study Siuslaw National Forest Stream Segments Captures and Crossings Associated With 2012 Aquatic Organism Passage Study Siuslaw National Forest
Stream segments, aquatic organism captures, stream surveys, and road-stream crossings described by these metadata accompany a 2012 electrofishing study of the distribution and abundance of aquatic organisms (fish, lampreys, amphibians and crayfish), conducted by the U.S. Geological Survey, and the Pacific Northwest Region Aquatic and Riparian Ecosystem Monitoring Project (AREMP) of the U...