Environmental stressors that impact habitat and wildlife species include: abiotic factors (for example, land use, temperature); soil, air, and water quality (for example, eutrophication, contaminants); and disturbance (for example, fire, drought, hurricanes, species invasions). Understanding how these stressors impact ecosystems is critical to conservation and management.
Chemical and isotopic techniques are very useful for improving our mechanistic understanding of the role of environmental stressors on ecosystems and wildlife species. Studies within this project generally emphasize animal fitness impacts related to stressors, such as food web disruptions, changes in resource quantity and quality, trophic transfer of non-essential elements, and the effects of landscape disturbances.
Tracer data can be used qualitatively and quantitatively to estimate effects, assess risk, and inform management actions. Such approaches are also very amenable to a range of temporal and spatial scales, where previous studies have ranged from discrete river drainages to oceanic basins and retrospective study designs that rely on environmental archives or museum specimens.

Geology, Geophysics, and Geochemistry Stable Isotope Laboratory (GSIL)
Food Webs and Wildlife Nutrition
Ecosystem Biogeochemistry
Wildlife Biogeography
Water chemistry, stable isotopes, and trace metals in sediment, water and biota in Torch Lake and Gratiot Lake, Keweenaw Peninsula, Michigan, USA, July and October 2021
Geochemical Analyses of Water, Mine tailings, Fluvial Suspended Sediments, Fluvial Bed Sediments, and Fluvial Flood Deposit Sediments from the Big River and Meramec River Drainage Basins, Missouri
Laboratory analyses for fish tissue from Lake Koocanusa and Kootenai River Basin, Montana, 2022
Modeled Pacific salmon escapement biomass and nutrient and contaminant concentrations across western North America, 1976-2015 (version 2.0, October 2024)
Total mercury, methylmercury, and isotopic composition in various life stages of boreal chorus frogs (Pseudacris maculata) at two subalpine ponds in the Rocky Mountains, CO, USA, 2015
Mercury concentrations, isotopic composition, biomass, and taxonomy of stream and riparian organisms in the vicinity of Yellow Pine, Idaho, 2015-2016.
Dataset for temporal influences on selenium partitioning, trophic transfer, and exposure in a major U.S. river
Chemistry of water, stream sediment, wildfire ash, soil, dust, and mine waste for Fourmile Creek Watershed, Colorado, 2010-2019
Stable carbon and nitrogen isotope data for: 'Ecotoxicoparasitology of the gastrointestinal tracts of pinnipeds: effect of parasites on bioavailability of total mercury (THg)'
Data for Biogeochemical and Physical Processes Controlling Mercury and Selenium Bioaccumulation in Bighorn Lake, Bighorn Canyon National Recreation Area, Montana and Wyoming, 2015-2016
Zinc concentrations and isotopic signatures of an aquatic insect (mayfly, Baetis tricaudatus)
Below are publications associated with this project.
Metal-rich lacustrine sediments from legacy mining perpetuate copper exposure to aquatic-riparian food webs
Continental-scale nutrient and contaminant delivery by Pacific salmon
Complex life histories alter patterns of mercury exposure and accumulation in a pond-breeding amphibian
Increased mercury and reduced insect diversity in linked stream-riparian food webs downstream of a historical mercury mine
Temporal influences on selenium partitioning, trophic transfer, and exposure in a major U.S. river
Benthic algal (Periphyton) growth rates in response to nitrogen and phosphorus: Parameter estimation for water quality models
Carbon chemistry of intact versus chronically drained peatlands in the southeastern USA
Metamorphosis affects metal concentrations and isotopic signatures in a mayfly (Baetis tricaudatus): Implications for the aquatic-terrestrial transfer of metals
Isotopic insights into biological regulation of zinc in contaminated systems
Ecotoxicoparasitology: Understanding mercury concentrations in gut contents, intestinal helminths and host tissues of Alaskan gray wolves (Canis lupus)
Stable isotope values in pup vibrissae reveal geographic variation in diets of gestating Steller sea lions Eumetopias jubatus
Metamorphosis alters contaminants and chemical tracers in insects: implications for food webs
Environmental stressors that impact habitat and wildlife species include: abiotic factors (for example, land use, temperature); soil, air, and water quality (for example, eutrophication, contaminants); and disturbance (for example, fire, drought, hurricanes, species invasions). Understanding how these stressors impact ecosystems is critical to conservation and management.
Chemical and isotopic techniques are very useful for improving our mechanistic understanding of the role of environmental stressors on ecosystems and wildlife species. Studies within this project generally emphasize animal fitness impacts related to stressors, such as food web disruptions, changes in resource quantity and quality, trophic transfer of non-essential elements, and the effects of landscape disturbances.
Tracer data can be used qualitatively and quantitatively to estimate effects, assess risk, and inform management actions. Such approaches are also very amenable to a range of temporal and spatial scales, where previous studies have ranged from discrete river drainages to oceanic basins and retrospective study designs that rely on environmental archives or museum specimens.

Geology, Geophysics, and Geochemistry Stable Isotope Laboratory (GSIL)
Food Webs and Wildlife Nutrition
Ecosystem Biogeochemistry
Wildlife Biogeography
Water chemistry, stable isotopes, and trace metals in sediment, water and biota in Torch Lake and Gratiot Lake, Keweenaw Peninsula, Michigan, USA, July and October 2021
Geochemical Analyses of Water, Mine tailings, Fluvial Suspended Sediments, Fluvial Bed Sediments, and Fluvial Flood Deposit Sediments from the Big River and Meramec River Drainage Basins, Missouri
Laboratory analyses for fish tissue from Lake Koocanusa and Kootenai River Basin, Montana, 2022
Modeled Pacific salmon escapement biomass and nutrient and contaminant concentrations across western North America, 1976-2015 (version 2.0, October 2024)
Total mercury, methylmercury, and isotopic composition in various life stages of boreal chorus frogs (Pseudacris maculata) at two subalpine ponds in the Rocky Mountains, CO, USA, 2015
Mercury concentrations, isotopic composition, biomass, and taxonomy of stream and riparian organisms in the vicinity of Yellow Pine, Idaho, 2015-2016.
Dataset for temporal influences on selenium partitioning, trophic transfer, and exposure in a major U.S. river
Chemistry of water, stream sediment, wildfire ash, soil, dust, and mine waste for Fourmile Creek Watershed, Colorado, 2010-2019
Stable carbon and nitrogen isotope data for: 'Ecotoxicoparasitology of the gastrointestinal tracts of pinnipeds: effect of parasites on bioavailability of total mercury (THg)'
Data for Biogeochemical and Physical Processes Controlling Mercury and Selenium Bioaccumulation in Bighorn Lake, Bighorn Canyon National Recreation Area, Montana and Wyoming, 2015-2016
Zinc concentrations and isotopic signatures of an aquatic insect (mayfly, Baetis tricaudatus)
Below are publications associated with this project.