2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 10:15 AM - 10:30 AM | COMMUNITY RESPONSE OF BENTHIC AND EMERGING INSECTS TO FISH DENSITY IN PRAIRIE STREAM PERMANENT WATER REFUGIA | 420 A
COMMUNITY RESPONSE OF BENTHIC AND EMERGING INSECTS TO FISH DENSITY IN PRAIRIE STREAM PERMANENT WATER REFUGIA
Hydrologic disturbances are major structuring forces in prairie streams, with permanent reaches serving as refugia during disturbance and source areas of colonists during recovery. Hydrologic disturbances likely influence biotic interactions as competition and predation might intensify in constricted reaches during low flow periods, possibly affecting invertebrate recovery patterns. We examined community structure of fishes, benthic invertebrates, and emerging adult aquatic insects from permanent pools in stream networks at the Konza Prairie Biological Station in northeastern KS. We also examined how varying densities of fishes influenced insect colonization of pool mesocosms. Fish densities were negatively associated with benthic invertebrate abundance but not total biomass. Fishes reduced emerging Chironomidae biomass (r2 = 0.43, p = 0.047) and body size (r2 = 0.61, p = 0.014), and overall emergence was delayed where predatory fish biomass was higher (fish, date interaction p = 0.036). The mesocosm experiment showed clear patterns of reduced colonizing insect abundance (p < 0.001) and invertebrate biomass (p = 0.001), as well as shift in functional feeding group composition, with increasing fish biomass. Results suggest that fishes influence colonization and community structure in critical refugia habitats in intermittent stream networks.
- Fish
- Life History
- Predator-prey
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Presenters/Authors
Sophia Bonjour
(), Southern Illinois University , sbonjour29@gmail.com;
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Matt Whiles
(), University of Florida, mwhiles@ufl.edu;
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Keith Gido
(), Kansas State University, kgido@ksu.edu;
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