2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 8:30 AM - 10:30 AM | PROJECTED ADVANCES IN LOW FLOW ALTER FOOD-WEB STRUCTURE AND INSECT EMERGENCE IN SIERRA NEVADA STREAMS: EVIDENCE FROM A LARGE-SCALE MESOCOSM EXPERIMENT | Virtual Platform
PROJECTED ADVANCES IN LOW FLOW ALTER FOOD-WEB STRUCTURE AND INSECT EMERGENCE IN SIERRA NEVADA STREAMS: EVIDENCE FROM A LARGE-SCALE MESOCOSM EXPERIMENT
Climate change may advance median snowmelt runoff in the Sierra Nevada up to two months by 2080. Although past studies support that extended low flows may affect macroinvertebrate composition and abundance, ramifications to food-webs remain largely unknown. Our project experimentally addressed how extended low flows, as a result of earlier snowmelt, may impact mountain stream food webs. We used nine large, flow-through channels at the Sierra Nevada Aquatic Research Lab (SNARL) in California and simulated three flow regimes: current conditions and low-flow duration increased by three and six weeks. We measured primary production and sampled benthic and emergent macroinvertebrates every three weeks. Early low flows increased daily maximum temperatures and diel fluctuations. Early low flow treatments increased algal respiration, but net primary production remained unaffected. The community composition of emerging insects and increased abundance of Chironominae were affected by low flow timing. Preliminary benthic macroinvertebrate results support that flatworms increased in abundance in response to early low flow. Nesting Brewers Blackbirds increased predation time of benthic macroinvertebrates during early low flow by 7-fold. Our results suggest that advanced low flows may have far-reaching effects on aquatic food webs.
- Climate change
- Flow regime
- Food webs
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Presenters/Authors
Kyle Leathers
(), University of California Berkeley, kyle_leathers@berkeley.edu;
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Guillermo de Mendoza
(), Institute of Geography, Faculty of Oceanography and Geography, University of Gdansk, gdemendoza.eco@gmail.com;
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David B. Herbst
(), Institute of Marine Sciences, University of California Santa Cruz, and Sierra Nevada Aquatic Research Laboratory, University of California Santa Barbara, herbst@lifesci.ucsb.edu;
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Gabriella Doerschlag
(), University of California Berkeley, gdoerschlag@berkeley.edu;
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Albert Ruhi
(), Department of Environmental Science, Policy, and Management, University of California Berkeley, albert.ruhi@berkeley.edu;
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