2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 12:00 PM - 12:15 PM | YOU ARE WHERE YOU EAT: ESTIMATING COASTAL WETLAND-DERIVED RESOURCE USE BY LAKE MICHIGAN SPORT FISH USING STABLE ISOTOPES | 430 B
YOU ARE WHERE YOU EAT: ESTIMATING COASTAL WETLAND-DERIVED RESOURCE USE BY LAKE MICHIGAN SPORT FISH USING STABLE ISOTOPES
Great Lakes coastal wetlands are highly productive ecosystems at the terrestrial-aquatic boundary that support diverse biological communities and provide critical habitat for many economically-important fish species. Open-water nearshore lake habitats are linked to coastal wetlands via the exchange of materials (e.g., organisms, nutrients, organic matter) through both abiotic (e.g., waves, seiches) and biotic (e.g., fish movement) mechanisms. The magnitude of these fluxes likely varies in part due to differing levels of hydrologic connection between the wetland and the nearshore. We estimated wetland-derived resource contributions to nearshore Lake Michigan sport fish among three coastal wetland hydrogeomorphic types (riverine, lacustrine, and barrier-protected) using stable carbon and nitrogen isotope mixing models. In general, both coastal wetland water dissolved inorganic carbon (DIC) and prey are significantly depleted in 13C relative to the nearshore across all wetland types, but these isotopic differences are more pronounced in systems with less hydrologic connectivity (i.e., barrier-protected wetlands in southern Lake Michigan). Quantifying the importance of coastal wetlands in supporting coastal fisheries will help managers prioritize the conservation and restoration of these areas, many of which have been degraded due to land use conversion, invasive species, and pollution.
- Food Webs
- Isotope
- Subsidy
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Presenters/Authors
Katherine O'Reilly
(), Department of Biological Sciences, University of Notre Dame, koreill2@nd.edu;
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Jeremiah Shrovnal
(), University of Wisconsin - Green Bay, shroj01@uwgb.edu;
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Christopher Houghton
(), University of Wisconsin - Green Bay, houghtoc@uwgb.edu;
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Patrick Forsythe
(), University of Wisconsin - Green Bay, forsythp@uwgb.edu;
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Gary Lamberti
(), University of Notre Dame, glambert@nd.edu;
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