2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/23/2018 | 9:15 AM - 9:30 AM | ENVIRONMENTAL AND BIOLOGICAL IMPACTS TO CRAYFISH POPULATIONS IN IMPOUNDED AND UNIMPOUNDED STREAMS IN ALABAMA | 330 A
ENVIRONMENTAL AND BIOLOGICAL IMPACTS TO CRAYFISH POPULATIONS IN IMPOUNDED AND UNIMPOUNDED STREAMS IN ALABAMA
Over half of the world’s rivers have seen changes in the magnitude and timing of flows due to water regulation and increased water usage, affecting the diversity and abundance of stream organisms. We related stream channel characteristics, water quality, predator fish and invasive crayfish abundance to the community structure of native crayfishes in impounded and unimpounded streams in Alabama. Crayfish and fish were sampled and physiochemical variables were measured at 6–10 sites in each of five streams (3 impounded, 2 unimpounded) within Bear Creek and Cahaba River drainages during spring and fall 2015–2017. Impoundment effects were detected in the Bear Creek Drainage. In this drainage, impounded streams’ crayfish assemblages were dominated by 2 crayfish species, while species assemblage gradually shifted as you moved downstream in unimpounded streams. These assemblage differences were best explained by environmental variables impacting habitat and food availability, and growth. The presence of an invasive crayfish species, in Cahaba River drainage streams eliminated the impact of impoundments on native crayfish communities. Both impoundments and invasive species impact native crayfish assemblages, shifting stream community structure throughout stream systems.
- Fragmentation
- Community
- Invertebrate
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Presenters/Authors
Zanethia Barnett
(), USDA Forest Service, zanethia.c.barnett@usda.gov;
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Susan Adams
(), USDA Forest Service, Center for Bottomland Hardwoods Research, Southern Research Station, sadams01@fs.fed.us;
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Clifford Ochs
(), University of Mississippi, byochs@go.olemiss.edu;
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