A5006393542- Fish Ecology and Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Hydrology and Sediment Transport Processes
- Aquatic Invertebrate Ecology and Behavior
- Amphibian and Reptile Biology
- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Isotope Analysis in Ecology
- Fish biology, ecology, and behavior
- Ecology and Vegetation Dynamics Studies
- Plant and animal studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Wildlife Ecology and Conservation
- Environmental DNA in Biodiversity Studies
- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Ecology and biodiversity studies
- Species Distribution and Climate Change
- Peatlands and Wetlands Ecology
- Rangeland and Wildlife Management
- Insect Resistance and Genetics
- CRISPR and Genetic Engineering
- Marine Biology and Ecology Research
- Fire effects on ecosystems
- Diatoms and Algae Research
University of Florida
2010-2025
Southern Illinois University Carbondale
2014-2024
Géosciences Environnement Toulouse
2022
Marine Biological Laboratory
2022
Kansas State University
1999-2019
Ecological Society of America
2017-2018
John Wiley & Sons (United States)
2017-2018
University of Illinois Urbana-Champaign
2013
University of Georgia
1992-1997
Great Plains streams are highly endangered and can serve as model systems for studying disturbance ecology related issues of resistance resilience in temperate freshwaters. These exist a precarious balance between flood drying. In general, microbial activity recovers days to weeks after drying or flooding, invertebrate fish species quick follow. lower forested reaches, floods may be more intense but less common. Upstream reaches prairie characterized by frequent drying, little canopy cover,...
Summary 1. Understanding the trophic status of consumers in freshwater habitats is central to understanding their ecological roles and significance. Tadpoles are a diverse abundant component many habitats, yet we know relatively little about feeding ecology true compared with other consumer groups. While tadpole species labelled herbivores or detritivores, there surprisingly evidence support these assignments. 2. Here discuss shortcomings our knowledge tadpoles provide suggestions examples...
We investigated the ability of North Carolina Biotic Index (NCBI) and Ephemeroptera + Plecoptera Trichoptera (EPT) index to track an experimental manipulation invertebrate community resultant alteration several ecosystem‐level processes in a headwater stream at Coweeta Hydrologic Laboratory western Carolina. Indices were calculated from quantitative monthly or bimonthly benthic samples moss‐covered rockface mixed substrate habitats, as well habitat‐weighted values based on proportion each...
Corn ( Zea mays L.) that has been genetically engineered to produce the Cry1Ab protein (Bt corn) is resistant lepidopteran pests. Bt corn widely planted in midwestern United States, often adjacent headwater streams. We show byproducts, such as pollen and detritus, enter streams are subject storage, consumption, transport downstream water bodies. Laboratory feeding trials showed consumption of byproducts reduced growth increased mortality nontarget stream insects. Stream insects important...
Summary 1. Few studies have assessed the role of tadpoles in tropical streams, although they are often abundant and conspicuous components these systems. Moreover, amphibian populations declining around globe, particularly stream‐dwelling species uplands, ecological consequences losses not understood. 2. We chose a stream central Panamanian highlands, which has an intact fauna stream‐breeding anurans, to examine losses. This site differs dramatically from sites nearby western Panama Costa...
We propose the Stream Biome Gradient Concept as a way to predict macroscale biological patterns in streams. This concept is based on hypothesis that many abiotic and biotic features of streams change predictably along climate (temperature precipitation) gradients because direct influences hydrology, geomorphology, interactions mediated by terrestrial vegetation. The generates testable hypotheses related continental variation among worldwide allows aquatic scientists understand how results...
Abstract Headwater streams remove, transform, and store inorganic nitrogen (N) delivered from surrounding watersheds, but excessive N inputs human activity can saturate removal capacity. Most research has focused on quantifying the water column over short periods in individual reaches, these ecosystem‐scale measurements suggest that assimilatory uptake accounts for most removal. However, cross‐system comparisons addressing relative role of particular biota responsible incorporating into...
Export of coarse particulate organic matter (CPOM) from three headwater streams was studied continuously over a period 8 (one stream) to 9.5 years (two streams) at the Coweeta Hydrologic Laboratory, North Carolina. Annual CPOM export among varied by factors 9.2 > 16 ×, much greater than 3.5 5.0 × variation in annual stream discharge. poorly correlated with discharge and more factor storm frequency magnitude. Over 63 >77% all occurred during largest 20 storms. individual sampling intervals...
Widespread planting of maize throughout the agricultural Midwest may result in detritus entering adjacent stream ecosystems, and 63% 2009 US crop was genetically modified to express insecticidal Cry proteins derived from Bacillus thuringiensis . Six months after harvest, we conducted a synoptic survey 217 sites Indiana determine extent presence Cry1Ab protein network. We found that 86% contained leaves, cobs, husks, and/or stalks active channel. also detected stream-channel at 13% water...
We present a comprehensive data set of gross primary production (GPP) and ecosystem respiration (ER) in open‐canopy, nutrient‐rich streams draining row‐crop agriculture the midwestern United States. used two approaches to characterize temporal spatial variation whole‐stream metabolism: continuous measurements one agricultural stream for 1 yr, periodic daily six on dates spanning summer, autumn, winter. Continuous revealed high rates GPP (range: 0.1 22.0 g O 2 m −2 d −1 ) ER −0.9 −34.8 that...
Abstract Ecosystems that are coupled by reciprocal flows of energy and nutrient subsidies can be viewed as a single “meta‐ecosystem.” Despite these connections, the flow is greatly asymmetrical seasonally pulsed. Here, we synthesize existing literature on stream–riparian meta‐ecosystems to quantify global patterns amount subsidy consumption organisms, known “allochthony.” These resource important since they comprise large portion consumer diets, but disrupted human modification streams...
Microbial communities play an important role in stream ecosystem processes, such as breakdown of senescent leaf litter, and a primary nutritional source for detritivorous macroinvertebrates. Antibiotics may affect microbial associated especially because recent river monitoring programs have indicated the presence antibiotics downstream wastewater treatment plants. In current study, effects chronic exposure to fluoroquinolone antibiotic ciprofloxacin (Cipro) were examined on community-level...
ABSTRACT Relationships between riparian land cover, in‐stream habitat, water chemistry, and macroinvertebrates were examined in headwater streams draining an agricultural region of Illinois. Macroinvertebrates organic matter collected monthly for one year from three intensively monitored with a gradient forest cover (6, 22, 31% area). Bioassessments physical habitat analyses also performed these 12 other nearby streams. The site the least had significantly greater percent silt substrates...
Headwater streams draining agricultural landscapes receive maize leaves ( Zea mays L.) via wind and surface runoff, yet the contribution of detritus to organic‐matter processing in is largely unknown. We quantified decomposition microbial respiration rates on conventional (non‐Bt) genetically engineered (Bt) three low‐order northwestern Indiana, USA. also examined how substrate quality in‐stream nutrient concentrations influenced by comparing red maple Acer rubrum ) nutrient‐rich...
In the midwestern United States, maize detritus enters streams draining agricultural land. Genetically modified Bt is commonly planted along and can possibly affect benthic macroinvertebrates, specifically members of order Trichoptera, which are closely related to target species some toxins important detritivores in streams. The significance inputs aquatic systems has only recently been recognized, assessments potential nontarget impacts on organisms lacking. We conducted laboratory feeding...