James J Roberts, PhD
James J Roberts is a Research Fisheries Biologist based in Huron, OH.
James has broad research expertise and investigates the ecological consequences of stressors like invasive species, climate change, and eutrophication for aquatic systems and specifically fish populations. There are three overall themes his research is split between (Invasive species, native fish ecology/conservation, and climate changes effects) which are all related to the conservation and management of aquatic species and systems.
Currently, he is investigating the movement, behavior, and habitat use of Grass Carp, an invasive species in the Great Lakes. He has also conducted research in the Laurentian Great Lakes examining the ecological consequences of seasonal hypolimnetic hypoxia, dead zones, in Lake Erie. Specifically, he studied the effects (behavioral, physiological, and inter-specific) of hypoxia on the benthic fish assemblage of Lake Erie, while focusing on yellow perch. Previously, James has explored the potential effects climate change may have on the persistence of Cutthroat Trout in stream and lake habitats throughout the Southern Rocky Mountain region."
Professional Experience
Research Fisheries Biologist, USGS 2020-present; Great Lakes Science Center
Fish Biologist, USGS 2015-2020; Colorado Water Science Center
Research Ecologist-Mendenhall Fellow, USGS 2012-2015; Fort Collins Science Center
Education and Certifications
Ph.D. University of Michigan
M.S. University of Wyoming
B.S. University of Michigan
Science and Products
Science pages by this scientist
Data releases by this scientist
Multimedia related to this scientist
Publications by this scientist
Comparability among four invertebrate sampling methods and two multimetric indexes, Fountain Creek Basin, Colorado, 2010–2012
Changes in biological communities of the Fountain Creek Basin, Colorado, 2003–2016, in relation to antecedent streamflow, water quality, and habitat
Thermal regimes of Rocky Mountain lakes warm with climate change
Effects of internal phosphorus loadings and food-web structure on the recovery of a deep lake from eutrophication
Nonnative trout invasions combined with climate change threaten persistence of isolated cutthroat trout populations in the southern Rocky Mountains
Past and future warming of a deep European lake (Lake Lugano): What are the climatic drivers?
Assessing and addressing the re-eutrophication of Lake Erie: central basin hypoxia
Fragmentation and thermal risks from climate change interact to affect persistence of native trout in the Colorado River basin
The past as prelude to the future for understanding 21st-century climate effects on Rocky Mountain Trout
Indirect consequences of hypolimnetic hypoxia on zooplankton growth in a large eutrophic lake
Evidence of hypoxic foraging forays by yellow perch (Perca flavescens) and potential consequences for prey consumption
Effects of hypoxia on consumption, growth, and RNA:DNA ratios of young Yellow Perch
Non-USGS Publications**
zooplankton growth in a large eutrophic lake. Aquatic Biology 16: 217-227.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Science pages by this scientist
Data releases by this scientist
Multimedia related to this scientist
Publications by this scientist
Comparability among four invertebrate sampling methods and two multimetric indexes, Fountain Creek Basin, Colorado, 2010–2012
Changes in biological communities of the Fountain Creek Basin, Colorado, 2003–2016, in relation to antecedent streamflow, water quality, and habitat
Thermal regimes of Rocky Mountain lakes warm with climate change
Effects of internal phosphorus loadings and food-web structure on the recovery of a deep lake from eutrophication
Nonnative trout invasions combined with climate change threaten persistence of isolated cutthroat trout populations in the southern Rocky Mountains
Past and future warming of a deep European lake (Lake Lugano): What are the climatic drivers?
Assessing and addressing the re-eutrophication of Lake Erie: central basin hypoxia
Fragmentation and thermal risks from climate change interact to affect persistence of native trout in the Colorado River basin
The past as prelude to the future for understanding 21st-century climate effects on Rocky Mountain Trout
Indirect consequences of hypolimnetic hypoxia on zooplankton growth in a large eutrophic lake
Evidence of hypoxic foraging forays by yellow perch (Perca flavescens) and potential consequences for prey consumption
Effects of hypoxia on consumption, growth, and RNA:DNA ratios of young Yellow Perch
Non-USGS Publications**
zooplankton growth in a large eutrophic lake. Aquatic Biology 16: 217-227.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.