2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/08/2017 | 11:30 AM - 11:45 AM | THE INFLUENCE OF FISH ON MACROINVERTEBRATE ASSEMBLAGES IN SMALL STREAMS IN THE BANKHEAD NATIONAL FOREST, ALABAMA | 306C
THE INFLUENCE OF FISH ON MACROINVERTEBRATE ASSEMBLAGES IN SMALL STREAMS IN THE BANKHEAD NATIONAL FOREST, ALABAMA
The influence of fish presence on the behavioral responses of benthic macroinvertebrates in situ were determined by measuring densities, diversities, and timing of the downstream transport of benthic invertebrates in the water column (aka drift). In July 2015, invertebrates were collected from the benthos and in the water column over a 24-hour period using drift nets. Five headwater streams containing reaches with and without fish were sampled in Bankhead National Forest, AL (n = 10). Invertebrates were identified to family level. Differences in community composition and densities of invertebrates in drift samples and benthic samples with and without fish, as well as the effect of time of day on drift invertebrate composition and magnitude were determined using ANOVA. Community level densities and richness in the drift and benthos were similar between reaches, regardless of time of day. However, dominant insect families such as Chironomidae, Perlidae, and Baetidae showed significant changes in timing of drifting events. Additionally, Leptoceridae and Simuliidae showed significant differences in drifting densities in the presence of fish. These results suggest that other factors independent of fish presence alter overall response of invertebrate drift in these streams.
- C11 Community Ecology
- C15 Population Ecology
- C03 Invertebrates
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Presenters/Authors
Thomas Hess
(), Department of Biology, Jacksonville State University, Jacksonville, AL, thess@stu.jsu.edu;
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Lori Tolley-Jordan
(), Jacksonville State University, ljordan@jsu.edu;
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