2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 10:00 AM - 10:15 AM | CONTEXT DEPENDENT EFFECTS OF FLOW ON FISH | 302C
CONTEXT DEPENDENT EFFECTS OF FLOW ON FISH
Freshwater fish population dynamics and demographics are thought to be highly influenced by hydrologic conditions. However, creating transferrable flow ecology relationships for fish has proved challenging. This is in part because fish responses to flow vary due to factors such as the intensity of the flow event and the tolerance of the fish species. We propose that attributes of the flow event, habitat, and fish are the major sources of context dependency that drive variation in fish responses. We present preliminary analyses of fish-flow relationships for 60 stream reaches over five years with a focus on testing hypotheses related to these sources of context dependency. We test which flow metrics best predict fish abundance and size-structure and examine whether fish-flow relationships vary by fish species or stream reach degradation. We find that the relationship between fish abundance and flow does vary by species/stream reach combination and are currently conducting further analysis to better understand the patterns seen. Awareness of these sources of context dependency can help managers interpret and explain data and predict vulnerability of fish communities.
- C02 Fish and Other Aquatic Vertebrates
- C22 Disturbance
- S31 Moving forward in flow ecology: identifying and testing key hypotheses
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Presenters/Authors
Annika Walters
(), USGS Wyoming Coop Fish and Wildlife Unit, annika.walters@uwyo.edu;
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Richard Walker
(), University of Wyoming, rwalker2442@gmail.com;
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