2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2019 | 9:15 AM - 9:30 AM | EFFECTS OF SIMULATED DROUGHT ON AQUATIC INSECT COMMUNITIES IN THE EASTERN SIERRA NEVADA | 151 G
EFFECTS OF SIMULATED DROUGHT ON AQUATIC INSECT COMMUNITIES IN THE EASTERN SIERRA NEVADA
As climate-induced flow variability increases in our riverine systems, some rivers with historically perennial flow regimes in the Sierra Nevada Mountains are becoming intermittent. We simulated future flow loss in this region by utilizing a set of nine experimental stream channels at the Sierra Nevada Aquatic Research Laboratory (SNARL). We conducted an experimental drought study subjecting the aquatic benthic insect community to various levels of flow reduction. We sampled the invertebrate community several times before, during, and after drought treatments were in effect. We were especially interested in how drought would affect invertebrate persistence and beta-diversity at SNARL, given that aquatic taxa in high elevation regions are adapted to a perennial hydrograph. Contrary to predictions, taxa at SNARL exhibited high resistance to drought stress until surface flow in the streams was lost. In terms of beta-diversity, community dissimilarity was maintained (turnover), while strong abundance gradients (nestedness) emerged through drought treatments and time. The results of our study highlight the importance of sustained surface flow in perennial systems.
- Disturbance
- Intermittency
- Biodiversity
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Presenters/Authors
Parsa Saffarinia
(), University of California, Riverside, psaff001@ucr.edu;
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Dave Herbst
(), Sierra Nevada Aquatic Research Laboratory, University of California Santa Barbara, david.herbst@lifesci.ucsb.edu;
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Bruce Medhurst
(), Sierra Nevada Aquatic Research Laboratory, University of California Santa Barbara, rbmedhurst@ucsb.edu;
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Kurt Anderson
(), University of California, Riverside, kurt.anderson@ucr.edu;
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