2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 3:30 PM - 3:45 PM | IMPACTS OF STREAMFLOW CONDITIONS ON DRIFTING INVERTEBRATES AND FISH BEHAVIOR IN A HEADWATERS STREAM | 302C
IMPACTS OF STREAMFLOW CONDITIONS ON DRIFTING INVERTEBRATES AND FISH BEHAVIOR IN A HEADWATERS STREAM
Streamflow has been described as the “master variable” in stream systems because of its ability to drive processes across multiple trophic levels and levels of ecological organization. We monitored invertebrate drift abundance and diversity as a function of streamflow and related that to fish movement and growth data in the Upper Shasta River in Northern California, at impaired flowrates and un-impaired flowrates. Invertebrate drift biomass was significantly less at impaired flows compared to un-impaired flows. Non-metric multi-dimensional scaling suggested that community dissimilarity between sites increased when impaired flows dropped below 0.5 cubic meters per second. Generally, fish movement was greater at the impaired flow site, and was negatively related to the size of individual prey items and amount of prey available. This was coupled with estimated decreased growth rates at impaired flowrates. Our results suggest that fish foraging behavior may be influenced indirectly by altered streamflow through changes to amount, size and diversity of invertebrate drift. This shift, coupled with low food availability, may result in decreased energetic efficiency causing decreased growth rates.
- C02 Fish and Other Aquatic Vertebrates
- C11 Community Ecology
- S31 Moving forward in flow ecology: identifying and testing key hypotheses
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Presenters/Authors
Timothy Caldwell
(), McBain Associates, Tim@mcbainassociates.com;
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Gabriel Rossi
(), University of California - Berkley, rossfactor@berkley.edu;
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Sudeep Chandra
(), Global Water Center and Biology Department, University of Nevada, Reno, sudeep@unr.edu;
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Christopher Adams
(), Michigan Technological University, ccadams@mtu.edu;
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