2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/27/2021 | 2:00 PM - 3:30 PM | Effects of fish communities on freshwater amphipod stocking success in Minnesota, USA | Virtual Platform
Effects of fish communities on freshwater amphipod stocking success in Minnesota, USA
Amphipods (small crustaceans important as waterfowl forage and indicators of ecosystem health) have declined in North America. We used a Before-After/Control-Impact study design to test the efficacy of stocking Gammarus lacustris to restore populations and whether fish impacted stocking success. We stocked Gammarus into 22 wetlands during winters 2017–2020. We conducted pre- and post-stocking amphipod surveys during fall (September – October) for 1–3 years post-stocking. We also surveyed fish communities in stocked (n=14) and control (n=11) wetlands, as well as wetlands with naturally abundant Gammarus densities (“natural” wetlands; n=18). Gammarus have not been found in 13 of the 14 post-stocking surveys at stocked wetlands. Of the five commonly occurring fish species, fathead minnows had higher abundance in natural wetlands whereas black bullheads, dace, and central mudminnows had higher abundance in stocked wetlands. Our results suggest that amphipod stocking is not successful within the first few years of stocking, and that fish may be hindering invertebrate stocking in some wetlands.
- Conservation
- Ecosystem Dynamics
- Ecosystem functioning
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Presenters/Authors
Michael Bieganek
(), Augsburg University, bieganem@augsburg.edu;
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