2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2021 | 8:30 AM - 10:30 AM | SPATIOTEMPORAL DRIVERS OF SUITABLE OVERWINTERING HABITAT FOR CENTRARCHID SPECIES IN A LARGE RIVER NETWORK | Virtual Platform
SPATIOTEMPORAL DRIVERS OF SUITABLE OVERWINTERING HABITAT FOR CENTRARCHID SPECIES IN A LARGE RIVER NETWORK
In rivers that experience winter ice cover, overwintering conditions play a central role in the survival of fishes. Centrarchids rely on backwater habitats and their populations can be bottlenecked by suitable habitat availability, which is often defined by the ranges of depth (>1 m), flow (<0.01 m/s), temperature (>1 °C) and dissolved oxygen (>5 mg/L). However, despite the importance of maintaining overwintering habitat, there remains uncertainty in the spatiotemporal drivers of midwinter conditions. We paired aquatic connectivity metrics with long-term midwinter data from field stations along the Upper Mississippi River System (UMRS) to evaluate the drivers of backwater habitat conditions. We found that presence of suitable habitat varied throughout the UMRS and within individual sites over the last 25 years. Increased ice and snow depth were associated with reduced habitat suitability. Further, increased connectivity between backwaters and lotic habitats led to elevated flow rates and reduced suitable habitat. Understanding how connectivity and climate variability combine to influence backwater environments is critical to maintaining sustainable fish communities throughout the UMRS, especially as we expect winter length and severity to change and mediate the spatial drivers of winter conditions.
- Climate variability
- Ecosystem Dynamics
- Connectivity
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Presenters/Authors
Robert J. Mooney
(), Center for Limnology, University of Wisconsin - Madison, rjmooney@wisc.edu;
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Hilary Dugan
(), University of Wisconsin-Madison, hdugan@wisc.edu;
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Madeline Magee
(), Wisconsin Department of Natural Resources, madeline.magee@wisconsin.gov;
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KathiJo Jankowski
(), U.S. Geological Survey, Upper Midwest Environmental Sciences Center, kjankowski@usgs.gov ;
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