A5057498180- Heavy metals in environment
- Environmental Toxicology and Ecotoxicology
- Soil and Water Nutrient Dynamics
- Aquatic Invertebrate Ecology and Behavior
- Fish Ecology and Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Hydrology and Watershed Management Studies
- Mine drainage and remediation techniques
- Aquatic Ecosystems and Phytoplankton Dynamics
- Invertebrate Taxonomy and Ecology
- Geochemistry and Elemental Analysis
- Heavy Metal Exposure and Toxicity
- Peatlands and Wetlands Ecology
- Land Use and Ecosystem Services
- Urban Stormwater Management Solutions
- Mercury impact and mitigation studies
- Pharmaceutical and Antibiotic Environmental Impacts
- Species Distribution and Climate Change
- Ionic liquids properties and applications
- Marine and coastal ecosystems
- Analytical chemistry methods development
- Hydrology and Sediment Transport Processes
- Water Quality and Pollution Assessment
- Diatoms and Algae Research
- Chromium effects and bioremediation
Kent State University
2016-2025
University of Michigan
2010-2018
Michigan United
2018
University of Notre Dame
2008-2013
An experiment in >1000 river and riparian sites found spatial patterns controls of carbon processing at the global scale.
Rapid and drastic anthropogenic impacts are affecting global biogeochemical processes driving biodiversity loss across Earth's ecosystems. In aquatic ecosystems, species distributions shifting, abundances of many have declined dramatically, threatened with extinction. addition to diversity, the ecosystem functions, services on which humans depend also being heavily impacted. Addressing these challenges not only requires direct action mitigate environmental but innovative approaches identify,...
Rivers and streams contribute to global carbon cycling by decomposing immense quantities of terrestrial plant matter. However, decomposition rates are highly variable large-scale patterns drivers this process remain poorly understood. Using a cellulose-based assay reflect the primary constituent detritus, we generated predictive model (81% variance explained) for cellulose across 514 globally distributed streams. A large number variables were important predicting decomposition, highlighting...
Ionic liquids (ILs) are being designed as green alternatives to volatile organic solvents that currently used in a wide range of industrial processes. While knowledge about the toxicity various ILs aquatic organisms has expanded recent years, data remains limited few animal taxa. Furthermore, studies have examined non-lethal effects on organisms. We investigated how affect mortality and feeding zebra mussel (Dreissena polymorpha), sessile bivalve is invasive North America much Europe. Lethal...
The pool of bioavailable metal in sediments can be much smaller than total concentration due to complexation and precipitation with ligands. Metal bioavailability toxicity sediment is often predicted from models simultaneous extracted acid volatile sulfide (SEM-AVS); however, studies the applicability these for Ni-contaminated have been conducted primarily laboratory settings. We investigated utility SEM-AVS under field conditions: Five lotic a range organic carbon contents were amended four...
Abstract Sediments in navigation‐dominated waterways frequently are contaminated with a variety of particle‐associated pollutants and subject to frequent short‐term resuspension events. There is little information documenting whether metal‐contaminated sediments has adverse ecological effects on resident aquatic organisms. Using novel laboratory approach, the authors examined mobilization Zn, Cu, Cd, Pb, Ni, Cr during 1 freshwater 2 coastal marine redeposition resulted toxicity model...
Diffusive gradients in thin films (DGTs) rapidly measure labile fractions of metal and are promoted as an assessment tool for bioavailability. Using macroinvertebrate community composition a response, this study compared the predictive ability DGT-measured Ni with acid volatile sulfide (AVS) organic carbon (OC) corrected [(SEM(Ni)-AVS)/f(OC)] total concentrations. In two experiments, sediments were amended placed within either streamside mesocosm or deployed situ. concentrations (C(DGT))...
Predation is known to have both direct and indirect effects on nutrient cycling in terrestrial aquatic ecosystems, the general stress paradigm (GSP) has been promoted as a theory for describing predator-mediated cycling. The GSP predicts that prey exposed predators will produce glucocorticosteroids, which host of physiological including gluconeogenesis, increased respiration, excretion N P, increases body C:N. We tested predictions using anuran larvae, exhibit morphological defenses addition...
The bioavailability of transition metals in sediments often depends on redox conditions the sediment. We explored how physicochemistry and toxicity anoxic Cu-amended changed as they aged (i.e., naturally oxidized) a flow-through flume. amended two (Dow Ocoee) with Cu, incubated flume, measured sediment over 213 days. As aged, oxygen penetrated to greater depth, relative abundance Fe oxides increased surface deep sediments, concentration acid volatile sulfide declined Ocoee sediments. total...
Abstract For a large part of earth's history, cyanobacterial mats thrived in low‐oxygen conditions, yet our understanding their ecological functioning is limited. Extant provide windows into the putative ancient ecosystems, and they continue to mediate biogeochemical transformations nutrient transport across sediment–water interface modern ecosystems. The structure function benthic are shaped by processes underlying sediments. A mat system submerged sinkhole Lake Huron ( LH ) provides unique...
Abstract Microbes play a critical role in plant litter decomposition and influence the fate of carbon rivers riparian zones. When decomposing low‐nutrient litter, microbes acquire nitrogen (N) phosphorus (P) from environment (i.e., nutrient immobilization), this process is potentially sensitive to loading changing climate. Nonetheless, environmental controls on immobilization are poorly understood because rates also influenced by chemistry, which coupled same factors. Here we used...
Summary The regulation and management of chemical contaminants rarely use community‐ ecosystem‐level endpoints, partly due to a lack suitable methods. To overcome this limitation, we propose contaminant exposure substrata ( CES ), an adaptation the widely used nutrient‐diffusing substratum method, assess responses biofilm communities in situ . We describe methods for using effects on biomass, community structure, process rates, biofilm–consumer interactions chemistry. also provide equations...
Abstract Physicochemical and ecological attributes of ecosystems (i.e., environmental context) can modify the exposure effects metals, which presents a challenge for ecosystem management. Furthermore, functional structural an may not respond equally to metals or be uniformly responsive context. We explored how physicochemical context modified sediment metal dose-response suite measures. Two sediments with high (HB) low (LB) acid volatile sulfide organic carbon content were amended copper...
ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTSlipping through the Cracks: Why is U.S. Environmental Protection Agency Not Funding Extramural Research on Chemicals in Our Environment?G. Allen Burton, Jr.*†, Richard Di Giulio‡, David Costello§, and Jason R. Rohr∥View Author Information† University of Michigan, School Natural Resources & Environment, 440 Church St., Ann Arbor, Michigan 48109, United States‡ Duke University, Nicholas Durham, North Carolina 27708, States§ Kent State Department...
Metals in sediment can be complexed by minerals, partition between solid and aqueous phases, cause toxicity at high concentrations. We studied how the oxidation of surface that occurs during aging alters partitioning Ni. Two sediments (Burntwood Raisin) were amended with Ni, equilibrated, incubated a flow-through flume, examined for physicochemistry to Hyalella azteca (7 day growth). Through time, (5 mm) was oxidized, acid-volatile sulfide concentrations declined Raisin sediment, amorphous...