Research Ecologist
Wyoming-Montana Water Science Center
Email:
tschmidt@usgs.gov
Office Phone:
406-457-5910
ORCID:
0000-0003-1400-0637
Supervisor:
John M Kilpatrick
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The Muddy Creek watershed, part of the Upper Colorado River watershed, is a semi-arid catchment in a sagebrush steppe ecosystem. A synoptic watershed assessment was conducted in 2010 to identify areas within the watershed that are more susceptible to mobilization of trace elements that occur in soils forming on marine shale. Samples of soil, stream sediment, and water were collected and assayed for major elements and a suite of trace elements. Formation waters discharged from two wells within the watershed were sampled in 2011 to evaluate their potential contribution of organic carbon, nitrogen (N) species, and trace elements to surface waters. In FY2012, analyses of the soil, rock, and water samples collected...
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These data were compiled to study mercury and selenium concentrations in fish species and assemblages in lotic waterbodies across the Upper Colorado River Basin. Data were compiled from State and Federal agencies. This data table contains raw concentration data, as well as standardized concentrations corrected for differences based on sample type (i.e., tissue type), species-specific bioaccumulation rates (Table S1), and fish size (Table S2). The data were used in linear mixed effects models to estimate average mercury and selenium concentration in fish species and in fish assemblages, including fish total length (cm), sampling location (Sub basin name and GPS coordinates), and sampling year (Figures 2,3, and 4...
Categories: Data;
Tags: Arizona,
Colorado,
Colorado Headwaters,
Colorado River,
Dirty Devil River, All tags...
Dolores River,
Great Divide-Upper Green River,
Green River,
Gunnison,
Gunnison River,
Lower Green,
New Mexico,
San Juan,
San Juan River,
USGS Science Data Catalog (SDC),
Upper Colorado River Basin,
Upper Colorado-Dirty Devil,
Upper Colorado-Dolores,
Utah,
White River,
White-Yampa,
Yampa River,
bioaccumulation,
biota,
endangered species,
environment,
fish,
fish samples,
fish tissue,
fishes,
mercury,
mercury,
mercury contamination,
selenium,
selenium,
selenium concentration, Fewer tags
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This dataset is comprised of water quality data and benthic macroinvertebrate data collected from basins in Colorado, USA, and Finland. The data includes ancillary water quality characteristics but also a suite of trace metals observed at each site. Also included are modeled outputs that characterize the bioavailability of each trace metal to a biotic ligand. These data were used to explore the importance of metal toxicity and pH as stressors on benthic macroinvertebrates characterized as the number of unique Ephemeroptera + Plecoptera + Trichoptera genera observed at each site. An interpretive summary of the work follows. One of the primary goals of biological assessment of rivers is to identify whether contaminants...
Categories: Data;
Types: Citation,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Benthic Macroinvertebrates,
Bioavailability,
Colorado,
Europe,
Finland, All tags...
Forestry,
Metals,
Mining,
Mixtures,
National Water Quality Program,
USGS Science Data Catalog (SDC),
United States,
biota,
environment,
inlandWaters,
pH, Fewer tags
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The objectives of the Metals Mixtures Project included developing quantitative models that describe and predict harm or lack thereof to aquatic organisms from multiple metals in mineralized rock drainages. Work consists of data analyses and model development using existing data, and original data from laboratory mesocosm and field studies. This product reports data generated from a series of four experiments conducted over four years, testing the toxicity of several metals with aquatic insect communities that were colonized in the field and then transferred and tested in experimental streams at the Fort Collins Science Center. The results are expected to be of interest to those preparing environmental impact...
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Fresh water is arguably the most valuable resource on the planet, but human activities threaten freshwater ecosystems. For example, use of synthetic chemicals, such as pesticides, road salts, and nutrients, has led to the ubiquitous contamination of aquatic systems, jeopardizing the integrity of ecological communities. Given the importance biodiversity plays in maintaining ecosystem health and function and the continued decline of freshwater species, it is vital to understand the direct, indirect, and lasting effects of synthetic contaminants on biota in freshwater systems. The majority of our knowledge regarding contaminant effects is comprised of short-term, single-contaminant laboratory toxicity tests that describe...
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