2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 8:30 AM - 10:30 AM | FLOW INTERMITTENCY, DISTANCE TO REFUGES, AND BENTHIC MACROINVERTEBRATE COMMUNITIES AT POINT REYES NATIONAL SEASHORE AND PINNACLES NATIONAL PARK, CALIFORNIA | Virtual Platform
FLOW INTERMITTENCY, DISTANCE TO REFUGES, AND BENTHIC MACROINVERTEBRATE COMMUNITIES AT POINT REYES NATIONAL SEASHORE AND PINNACLES NATIONAL PARK, CALIFORNIA
In streams, drying events influence the structure of aquatic communities. As species cope with flow intermittency, proximity to perennial refuges elsewhere in the stream network may also be important in determining local community structure. To examine how intermittency and distance to refuges affect stream biota, we monitored streamflow and surveyed aquatic macroinvertebrates and vertebrates across two years in 11 coastal stream reaches at Pine Gulch in Point Reyes National Seashore and 16 inland stream reaches at Chalone Creek in Pinnacles National Park, California. We determined the number of days flowing prior to sampling, the percentage of days per year with flow, and the number of times per year each reach dried. We also measured the distance of each intermittent reach to perennial refuges. We identified 299 macroinvertebrate and 10 vertebrate taxa across the two basins. Reaches in Pine Gulch basin had higher species richness but lower densities than those in Chalone Creek. Perennial and intermittent reaches had distinct faunas, and increased intermittency and distance to refuges were negatively associated with taxon richness and density. Given these results, increased drought intensity in the region may lead to decreased aquatic biodiversity.
- Dry rivers
- Ecohydrology
- Flow regime
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Presenters/Authors
Brian Gill
(), School of Natural Resources and the Environment, The University of Arizona, briangill@email.arizona.edu;
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Anthony Sanabria
(), University of California, Berkeley, asanabria@oakland.edu;
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Miranda Gonzales
(), University of California, Berkeley, mgon23@berkeley.edu;
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Stephanie Carlson
(), Department of Environmental Science, Policy, and Management, University of California, Berkeley, California, U.S., smcarlson@berkeley.edu;
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Michael Bogan
(), School of Natural Resources and the Environment, The University of Arizona, mbogan@email.arizona.edu;
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