2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 11:00 AM - 11:15 AM | DISTANCE DECAY OF SIMILARITY IN STREAM INVERTEBRATE COMMUNITIES: CLIMATIC INFLUENCES OVER SPACE AND TIME | 151 G
DISTANCE DECAY OF SIMILARITY IN STREAM INVERTEBRATE COMMUNITIES: CLIMATIC INFLUENCES OVER SPACE AND TIME
A fundamental concept in metacommunity ecology is the distance decay of similarity (DDS). DDS occurs because local communities from distant habitats tend to be more compositionally dissimilar due to the combined effects of environmental gradients, dispersal barriers, and ecological drift. Research on the topic has largely assessed DDS across geographic gradients. Although time-varying environmental forcing could drive temporal variation in DDS, this idea remains untested. Here we used stream macroinvertebrate data from the California Surface Water Ambient Monitoring Program (SWAMP) to analyze the DDS within different hydrologic regions of California, and for a period of eight years (2008-2015). This time span includes periods of drought and average precipitation. We observed that DDS in reference sites varied across years and hydrologic regions, with slopes being steeper in northern areas and particularly during drought. We also tested whether anthropogenic hydrologic alteration could dampen the effects of hydroclimatic fluctuations by comparing patterns obtained from reference and non-reference sites. Our work advances the notion that invertebrate metacommunity structure in streams is time-varying, and may respond to periodic fluctuations in environmental conditions and habitat connectivity.
- Spatial
- Temporal
- Disturbance
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Presenters/Authors
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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Albert Ruhi
(), Department of Environmental Science, Policy, and Management, University of California Berkeley, albert.ruhi@berkeley.edu;
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