2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 12:15 PM - 12:30 PM | EFFECTS OF FISHES ON AQUATIC INSECTS IN LINKED AQUATIC-TERRESTRIAL FOOD WEBS | 420 A
EFFECTS OF FISHES ON AQUATIC INSECTS IN LINKED AQUATIC-TERRESTRIAL FOOD WEBS
Aquatic insects are important sources of energy for freshwater fishes and important sources of energy in linked aquatic-terrestrial food webs. The consumption of aquatic insects by fishes reduces the energy available to aquatic and terrestrial food webs. Our research predicted that fishes alter local food webs and affect ecosystem productivity. Emergence traps and fish exclusion cages were used to collect emergers from treatments with and without fish to determine the reduction of emergance by fishes to terrestrial ecosystems. Fish and benthic communities were sampled and recorded, fish diets were sampled, and terrestrial insectivorous spider abundances were recorded. Data suggests that fish sampled were primarily water column feeding fish and that the stage of aquatic insects consumed varied across species. Fish exclusion cages yielded higher emergent insect biomass above the former beaver dam, and that the terrestrial spider densities were higher above cages without fish. Our results will help to determine the direct and indirect effects of fishes on ecosystems, allow for the testing of new theory in ecology about the role of size-structured prey, and frame the potential role of fish species loss or introduction in linked aquatic-terrestrial food webs.
- Predator-prey
- Reciprocal Subsidies
- Ecosystem
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Presenters/Authors
Tyler Seidel
(), University of Minnesota, t.seidel983@gmail.com;
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Jeff Wesner
(), University of South Dakota, Jeff.Wesner@usd.edu;
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