Biogeochemical cycles impart significant control on ecosystem structure, function, and ecosystem services, such as nutrient sequestration, transformation, long-term storage, mitigation of water quality concerns, and carbon fixation/mineralization processes that support local food webs.

Isotope geochemistry offers novel insight into sources, processes, and fates of a broad array of elements that are relevant to ecosystem science. These geochemical insights also integrate well with food web studies, offering a more complete assessment of critical nutrient sources, fixation, and ultimately secondary production.
This project includes studies that explicitly focus on elements (for example, carbon, nitrogen, sulfur) that have strong linkages between geochemical compartments and biological production (for example, nutrient sources/fates, decomposition, carbon fixation, food webs) as well as related processes for non-essential elements (for example, bioaccumulation) and long-term storage/permanence important to ecosystem function and persistence (for example, soil carbon). The latter also includes studies of natural environmental archives (for example, tree rings, sediments) that inform on historical and contemporary ecosystem health with the goal of aiding conservation and management.

Geology, Geophysics, and Geochemistry Stable Isotope Laboratory (GSIL)
Food Webs and Wildlife Nutrition
Wildlife Biogeography
Environmental Stressors
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
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 isotope and wood component concentration data for riparian cottonwood tree rings, Little Missouri River, North Dakota
Lignin phenol data for solid phase peat cores collected from the Alligator River and Great Dismal Swamp National Wildlife Refuges
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)
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
Short- and long-term responses of riparian cottonwoods (Populus spp.) to flow diversion: Analysis of tree-ring radial growth and stable carbon isotopes
Juvenile Coho and Chinook salmon growth, size, and condition linked to watershed-scale salmon spawner abundance
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
Bridging the gap between salmon spawner abundance and marine nutrient assimilation by juvenile salmon: Seasonal cycles and landscape effects at the watershed scale
Effects of age and environment on stable carbon isotope ratios in tree rings of riparian Populus
Determination of δ13C, δ15N, or δ34S by isotope-ratio-monitoring mass spectrometry using an elemental analyzer
Metamorphosis affects metal concentrations and isotopic signatures in a mayfly (Baetis tricaudatus): Implications for the aquatic-terrestrial transfer of metals
Biogeochemical cycles impart significant control on ecosystem structure, function, and ecosystem services, such as nutrient sequestration, transformation, long-term storage, mitigation of water quality concerns, and carbon fixation/mineralization processes that support local food webs.

Isotope geochemistry offers novel insight into sources, processes, and fates of a broad array of elements that are relevant to ecosystem science. These geochemical insights also integrate well with food web studies, offering a more complete assessment of critical nutrient sources, fixation, and ultimately secondary production.
This project includes studies that explicitly focus on elements (for example, carbon, nitrogen, sulfur) that have strong linkages between geochemical compartments and biological production (for example, nutrient sources/fates, decomposition, carbon fixation, food webs) as well as related processes for non-essential elements (for example, bioaccumulation) and long-term storage/permanence important to ecosystem function and persistence (for example, soil carbon). The latter also includes studies of natural environmental archives (for example, tree rings, sediments) that inform on historical and contemporary ecosystem health with the goal of aiding conservation and management.
