David Walters - USGS

Aquatic Systems

Ecologist

Duty Station:
Fort Collins Science Center
2150 Centre Ave
Bldg C
Fort Collins, CO 80525

Phone: 970-226-9484
Fax: 970.226.9230
Email: waltersd@usgs.gov

Current Research

• Spawning-related Movements of Flathead Chub in a Prairie Stream

Publications

• Assessing ongoing sources of dissolved phase Polychlorinated Biphenyls (PCBs) in a contaminated stream
• Genetic diversity and species diversity of stream fishes covary across a land-use gradient
• The distance that contaminated aquatic subsidies extend into lake riparian zones
• An assessment of stressor extent and biological condition in the North American mid-continent great rivers (USA)
• Transfer of trace metals from streams to terrestrial food webs by emerging aquatic insects in mineralized alpine ecosystems
• Biologically-mediated flux of trace metals from streams to riparian spiders: a large scale survey in mineralized alpine ecosystems
• Trophic magnification of PCBs and its relationship to the octanol--water partition coefficient
• New Developments in Instream Flow Science and Tools at the Fort Collins Science Center [Poster]
• Transformation of chiral polychlorinated biphenyls (PCBs) in a stream food web
• Persistent organic pollutants in fish tissue in the mid-continental great rivers of the United States
• Spider-mediated flux of PCBs from contaminated sediments to terrestrial ecosystems and potential risks to arachnivorous birds
• Reproductive isolation and the expansion of an invasive hybrid swarm
• Larval salamanders and channel geomorphology are indicators of hydrologic permanence in forested headwater streams
• Environmental indicators of macroinvertebrate and fish assemblage integrity in urbanizing watersheds
• Foodweb modeling for polychlorinated biphenyls (PCBs) in the Twelvemile Creek Arm of Lake Hartwell, South Carolina, USA
• The dark side of subsidies: Adult stream insects export organic contaminants to riparian predators
• Comparing trophic position of stream fishes using stable isotope and gut contents analyses
• Influence of Trophic Position and Spatial Location on Polychlorinated Biphenyl (PCB) Bioaccumulation in a Stream Food Web
• Physical indicators of hydrologic permanence in forested headwater streams
• Red shiner invasion and hybridization with blacktail shiner in the upper Coosa River, USA
• Reach-scale geomorphology affects organic matter and consumer δ13C in a forested Piedmont stream
• Urbanization effects on fishes and habitat quality in a southern Piedmont river basin
• Geomorphology and fish assemblages in a Piedmont river basin, U.S.A
• Urbanization, sedimentation, and the homogenization of fish assemblages in the Etowah River Basin, USA
• Distribution of Gambusia (Poeciliidae) in a southeastern river system and the use of fin ray counts for species determination