2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | EFFECTS OF FLURIDONE TREATMENT OF ELODEA CANADENSIS ON AQUATIC INSECT COMMUNITIES IN PONDS OF THE COPPER RIVER DELTA, AK | Virtual Platform
EFFECTS OF FLURIDONE TREATMENT OF ELODEA CANADENSIS ON AQUATIC INSECT COMMUNITIES IN PONDS OF THE COPPER RIVER DELTA, AK
Elodea canadensis was documented on the Copper River Delta (CRD) in southcentral Alaska in 1982 and is the state’s first aquatic invasive macrophyte. With its ability to propagate vegetatively and survive Alaska’s cold winters, Elodea is now a dominant macrophyte by percent cover in several ponds across the CRD. Fluridone is an aquatic herbicide commonly used to treat many nuisance aquatic macrophytes, including Elodea in ponds on the Kenai Peninsula, AK and the CRD. The goal of this study was to examine the indirect effects of fluridone on macrophyte-associated aquatic insect communities. Five ponds were sampled over two years and selected on the basis of Elodea presence/absence and fluridone treated/untreated. Aquatic insects were collected monthly during summers from beds of two native macrophytes (Nuphar lutea and Hippuris vulgaris) and invasive E. canadensis. Chironomidae were numerically dominant in all samples, however functional feeding group (FFG) composition differed among ponds and macrophytes. Elodea beds from fluridone-treated ponds had lower predator:piercer-herbivore relative abundances than native beds in treated ponds. Species richness in treated ponds significantly decreased in native and invasive macrophyte beds the first year post-treatment, whereas densities increased.
- Climate change
- Monitoring
- Management
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Presenters/Authors
Erica Becker
(), Loyola University Chicago, ebecker@luc.edu;
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Martin Berg
(), Loyola University Chicago, mberg@luc.edu;
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