2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/23/2019 | 2:45 PM - 3:00 PM | USING STREAM FOOD WEB PRODUCTIVITY AND FISH BIOENERGETICS TO INFORM INSTREAM FLOW NEEDS | 250 CF

USING STREAM FOOD WEB PRODUCTIVITY AND FISH BIOENERGETICS TO INFORM INSTREAM FLOW NEEDS

Stream flow is a master variable in stream ecosystems. In streams with altered flow regimes and the potential to improve stream flows, there is a need for a mechanistic understanding of how stream flows build food webs to maintain fish in good condition, as a supplement to the historical focus on physical habitat (e.g. PHABSIM). Bioenergetic models have recently been adapted to incorporate food supply into flow recommendations but most applications assume static concentrations of food across space and time. Our ongoing research in the upper Shasta River, California examines productivity of benthic macroinvertebrates and flux rates of drifting invertebrates in different habitat types (riffles and pools) and seasons (year-round) above and below a major stream flow diversion. We are linking these variables in a spatially and temporally explicit bioenergetics model to better understand how stream flows influence the availability of macroinvertebrates and fish foraging modes (specifically drift vs search foraging), creating energetically favorable or unfavorable conditions for salmonid fish throughout the year and across different habitats. Incorporating seasonal and spatial food availability into the bioenergetics model will improve our ability to inform instream flow and habitat restoration recommendations.

Secondary Production
Fish
Bioindicators

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Presenters/Authors

Suzanne Kelson (), University of Nevada, Reno, skelson@unr.edu;