2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 9:15 AM - 9:30 AM | DIET AND REPRODUCTIVE INVESTMENT OF NATIVE BENTHIC STREAM FISH IN RESPONSE TO ROUND GOBY INVASION | 430 B
DIET AND REPRODUCTIVE INVESTMENT OF NATIVE BENTHIC STREAM FISH IN RESPONSE TO ROUND GOBY INVASION
The abundance and persistence of the invasive round goby (Neogobius melanostomus) has often resulted in antagonistic interactions between the invasive and its native competitors. To quantify the consequences of these interactions on feeding strategies and reproductive timing of native fishes, we conducted surveys of fish communities over three years (2015-2017) in seven Michigan rivers. The native Johnny darter (Etheostoma nigrum) was used as a representative native competitor to compare to round goby in areas where the two species coexist. Gut contents and gonad masses were obtained through dissections and compared between species. Johnny darter individuals were further compared between sites where they do and do not co-occur with round goby to identify changes in feeding and reproductive strategies directly associated with round goby interaction. Although no differences in gut fullness were observed between species, gut content diversity was significantly greater in round goby than Johnny darter in all locations. Johnny darter also exhibited reproductive investment earlier in the year in populations coexisting with round goby as observed through gonad masses. These results indicate a shift in feeding strategy and reproductive timing by native competitors in the presence of round goby.
- Fish
- Diet
- Isotope
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Presenters/Authors
Corey Krabbenhoft
(), University of Minnesota, krabb012@umn.edu;
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Donna Kashian
(), Wayne State University, dkashian@wayne.edu;
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