2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2019 | 11:00 AM - 11:15 AM | A FRAMEWORK FOR UNDERSTANDING FISH COMMUNITY RESPONSE TO FLOW ALTERATION | 250 CF
A FRAMEWORK FOR UNDERSTANDING FISH COMMUNITY RESPONSE TO FLOW ALTERATION
Riverine fish communities, like other communities, can be viewed as the product of both selective and neutral processes acting on the available species pool. Selective processes include abiotic habitat filtering and all species interactions, which together define the realized niche and depend on species traits. Neutral processes include the random loss of species and undirected dispersal, and imply a substantial degree of exchangeability or redundancy among subsets of species. Much effort has gone into understanding fish species’ niches and the traits that govern their response to human perturbations, yet trait-based frameworks for predicting specific responses to individual stressors remain fairly primitive. Neutral relationships of species richness with stream size and with downstream link magnitude, which can be derived from island biogeography theory, can provide a complementary approach to predicting whole-community response to stressors such as water withdrawals. We describe a conceptual framework that considers both selective and neutral processes as a way to make sense of the complexity of fish community responses to anthropogenic river flow alteration, particularly reduced low flows.
- Hydrology
- Conservation
- Dispersal
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Presenters/Authors
Seth Wenger
(), University of Georgia, sethwenger@fastmail.fm;
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Mary Freeman
(), US Geological Survey, mcfreeman@usgs.gov;
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