A5023169602- Fish Ecology and Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Fish Biology and Ecology Studies
- Marine and fisheries research
- Hydrology and Sediment Transport Processes
- Environmental DNA in Biodiversity Studies
- Water Quality and Resources Studies
- Underwater Acoustics Research
- Hydrology and Watershed Management Studies
- Fish biology, ecology, and behavior
- Identification and Quantification in Food
- Soil and Water Nutrient Dynamics
- Ecology and biodiversity studies
- Wildlife Ecology and Conservation
- Species Distribution and Climate Change
- Aquatic Ecosystems and Biodiversity
- Isotope Analysis in Ecology
- Genetic diversity and population structure
- Aquatic Ecosystems and Phytoplankton Dynamics
- Freshwater macroinvertebrate diversity and ecology
- Forest Insect Ecology and Management
- Gender Politics and Representation
- Environmental Conservation and Management
- Maritime and Coastal Archaeology
- Gender Diversity and Inequality
United States Geological Survey
2016-2025
Great Lakes Science Center
2015-2024
Pennsylvania State University
1997-2005
Colorado State University
1997
Grass carp (Ctenopharyngodon idella), an invasive species of Asian carp, has been stocked for many decades in the United States vegetation control. Adult individuals have found all Great Lakes except Lake Superior, but no self-sustaining populations yet identified tributaries. In 2012, a commercial fisherman caught four juvenile diploid grass Sandusky River, major tributary to Erie. Otolith microchemistry and capture location these fish permitted conclusion that they were most likely...
Seasonal degradation of aquatic habitats from hypoxia occurs in numerous freshwater and coastal marine systems can result direct mortality or displacement fish. Yet, fishery landings these are frequently unresponsive to changes the severity extent hypoxia, population-scale effects have been difficult measure except extreme hypoxic conditions with hypoxia-sensitive species. We investigated fine-scale temporal spatial variability dissolved oxygen Lake Erie as it related fish distribution catch...
Invasive carps are ecologically and economically problematic fish species in many large river basins the United States pose a threat to aquatic ecosystems throughout much of North America. Four invasive carps: black carp (Mylopharyngodon piceus), grass (Ctenopharyngodon idella), silver (Hypophthalmichthys molitrix) bighead nobilis), particularly concerning for native because they occupy disrupt variety food habitat niches. In response, natural resource agencies developing integrated pest...
Abstract Multivariate analysis of fish morphometric truss elements for stock identification, description new species, assessment condition, and other applications is frequently conducted on data sets that have sample sizes smaller than those recommended in the literature. Minimum size recommendations are rarely accompanied by empirical support, we know no previous minimum multivariate elements. We examined stability outcomes principal components (PCA) elements, a commonly applied method...
There is concern of economic and environmental damage occuring if any the four major aquacultured carp species China, black Mylopharyngodon piceus, bighead Hypophthalmichthys nobilis, silver H. molitrix, or grass Ctenopharyngodon idella, were to establish in Laurentian Great Lakes. All are reproducing Mississippi River Basin. We review status these fishes relation Lakes their proximity pathways into Lakes, based on captures collections eggs larvae. No have been captured One one within...
Identifying spawning and hatching locations is vital to controlling invasive fish conserving imperiled fish, which can be difficult for pelagically species with semi-buoyant eggs. In freshwater systems, this reproductive strategy common among cyprinid species, such as Chinese carp currently threatening the Great Lakes. Following confirmation that one of these grass (Ctenopharyngodon idella), was in a Lakes tributary, we developed modeling framework combine field data hydraulic models...
Control of invasive grass carp (Ctenopharyngodon idella) populations in the Western Lake Erie Basin merits adaptive management guided by best available science. Presently (2024), capture mature rivers during spawning season is most efficient, so knowing when and where are essential information for natural resource agencies. Using bidirectional drift modeling ichthyoplankton samples captured Maumee River 2017–2019 seasons, this study identified 12 probable areas lower 96.5-kilometers River....
Abstract Native diadromous fishes have been extirpated from much of the Susquehanna River system for nearly a century. Recent restoration efforts focused on removal dams, but there are hundreds dams and presently is no biologically based to assist in prioritizing their removal. We present new method that uses existing habitat suitability index models (HSI) American shad Alosa sapidissima , alewife A. pseudoharengus blueback herring aestivalis eel Anguilla rostrata prioritize non‐hydropower...
Age estimation is an important diagnostic tool for fisheries managers. Previous studies on comparison of age methods walleyes Stizostedion vitreum have shown otoliths are the best method overall and that dorsal spine cross sections a suitable alternative to scales, most commonly used method. We compared ages estimated from dorsal-spine sections, unexploited Pymatuning Sanctuary, Pennsylvania. collected these structures fish sampled in trap nets during spawning run March April 1997. Two...
Whole‐body morphometrics and 15 nuclear DNA microsatellite loci were analysed for 158 Perca flavescens collected during the spawning season from four locations in central Lake Erie, two along northern shore southern shore, to evaluate fine‐scale variation (spanning 17–94 km). Results showed significant morphological genetic differences among P. locations. The magnitudes of unrelated geographic distance, demonstrating spatially heterogeneous levels divergence. These results linked...
Walleye (Sander vitreus) in Lake Erie is a valuable and migratory species that spawns tributaries. We used hydroacoustic sampling, gill net Bayesian state-space modeling to estimate the spawning stock abundance, characterize size sex structure, explore environmental factors cuing migration of walleye Maumee River for 2011 2012. estimated abundance be between 431 000 1 446 individuals 386 400 857 200 2012 (95% credible intervals). A back-calculation from concurrent larval fish study produced...
We examined long-term effects of annual intensive backpack electrofishing on rates spinal injury and population abundance three salmonid one catostomid species in small northern Colorado streams compared externally evident injuries to actual determined by X ray. After 6–8 years three-pass removal electrofishing, for brook trout Salvelinus fontinalis treatment sections two averaged 10.4% 12.3%, but were 0% previously unshocked controls. In a third stream containing all sympatry, longnose...
Temperature is an important abiotic factor affecting fish population dynamics. An unfavorable thermal regimen can restrict a species' ability to thrive in its environment. We studied the effects of on feeding, condition, and growth unexploited walleyes Stizostedion vitreum Pymatuning Sanctuary, Pennsylvania. used gastric lavage sample stomach contents captured by electrofishing during bimonthly sampling from May through October, 1997–1998. sampled available forage shoreline seining recorded...
Abstract Bighead Carp Hypophthalmichthys nobilis, Black Mylopharyngodon piceus, Grass Ctenopharyngodon idella, and Silver H. molitrix are considered invasive species in North America Europe. In America, they typically referred to collectively as “Asian carp,” a reference their native range. The category carp” fails acknowledge the cultural value ecological differences of these fishes, causes confusion when translated into Chinese, frequently communication problems with public occasionally...
Abstract We used length frequencies of captured walleyes Sander vitreus to indirectly estimate and compare selectivity between two experimental gill‐net configurations sample fish in Lake Erie: (1) a multifilament configuration currently by the Ohio Department Natural Resources (ODNR) with stretched‐measure mesh sizes ranging from 51 127 mm constant filament diameter (0.37 mm); (2) monofilament 38 178 varying (range = 0.20–0.33 mm). Paired sampling revealed that catch smaller than 250 larger...
Studies on the dynamics of unexploited fish populations are rare in fisheries literature. The purpose this research was to describe population walleyes Stizostedion vitreum Pymatuning Sanctuary, a 530-ha eutrophic impoundment northwestern Pennsylvania. We sampled with trap nets during spring spawning runs March and April 1997–1998. estimated adult abundance using Schnabel multiple mark–recapture method used walleye ages from scales otoliths for growth mortality analyses. Population estimates...