Elevated methylmercury concentration and trophic position of the non-native bloody red shrimp (Hemimysis anomala) increase biomagnification risk in nearshore food webs |
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| Affiliation: | 1. Hobart and William Smith Colleges, Department of Biology, 300 Pulteney Street, Geneva, NY 14456, USA;2. Finger Lakes Institute, Hobart and William Smith Colleges, Geneva, NY, USA;3. State University of New York College of Environmental Science and Forestry, Department of Environmental Biology, Syracuse, NY, USA;1. School of Natural Resources & Environment, Lake Superior State University, 650 W. Easterday Ave., Sault Ste. Marie, MI 49783, USA;2. Center for Freshwater Research and Education, Lake Superior State University, 650 W. Easterday Ave., Sault Ste. Marie, MI 49783, USA;1. School for Environment and Sustainability, University of Michigan, 440 Church St, Ann Arbor, MI 48109, USA;2. Great Lakes Water Studies Institute, Northwestern Michigan College, 1701 Front St, Traverse City, MI 49686, USA;1. University of Wisconsin-Green Bay, Department of Natural and Applied Sciences, 2420 Nicolet Drive, Green Bay, WI 54311, USA;2. U.S. Fish and Wildlife Service, Green Bay Fish and Wildlife Conservation Office, 2661 Scott Tower Drive, New Franken, WI 54229, USA;3. Wisconsin Department of Natural Resources, Bureau of Fisheries Management, 110 S Neenah Ave, Sturgeon Bay, WI 54235, USA;1. Illinois State Geological Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign, 701 North Point Drive, Winthrop Harbor, IL 60096, USA;2. Department of Geography, Environment, and Spatial Sciences, Michigan State University, 673 Auditorium Rd., East Lansing, MI 48824;3. Department of Geography and the Environment, Suite G67, Mendel Science Center, Villanova University, 800 E. Lancaster Avenue, Villanova, PA 19085;1. Purdue University, Department of Forestry and Natural Resources, 195 Marsteller Street, West Lafayette, IN 48105, USA;2. Illinois-Indiana Sea Grant, Department of Forestry and Natural Resources, Purdue University, 195 Marsteller Street, West Lafayette, IN 48105, USA;3. Tetra Tech, 10 Post Office Square, Suite 1100, Boston, MA 02109, USA;4. National Oceanographic and Atmospheric Administration, Great Lakes Environmental Research Laboratory, 4840 S. State Rd., Ann Arbor, MI 48108-9719, USA |
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| Abstract: | The establishment of non-native species can result in complex shifts in food-web structure and ecosystem function that alter the bioaccumulation, transfer, and biomagnification of contaminants. Hemimysis anomala (the bloody red shrimp), a mysid native to the Ponto-Caspian region that is now established throughout the Laurentian Great Lakes region (North America) and Europe, is characterized by high densities and a trophic ecology that may be consequential to mercury fluxes and bioaccumulation. We combined methylmercury (MeHg) and stable isotope (δ15N and δ13C) analyses of invertebrates from Seneca Lake (NY, USA) to test the hypotheses that mercury concentrations differ among (1) H. anomala and native or naturalized analogs due to food-web position and (2) stages of H. anomala due to ontogenetic diet shifts. The MeHg concentration and δ15N of H. anomala exceeded other littoral invertebrates (such as amphipods, dreissenid mussels, and zooplankton >153 μm) and were as high as the pelagic, native Mysis diluviana. These taxa-specific patterns indicate intensified biomagnification of MeHg is possible in nearshore and reef-spawning fish following the establishment of H. anomala, an energy-dense prey item for economically and ecologically important fish. Larger, adult H. anomala had higher MeHg concentrations and more enriched δ15N than juveniles, and H. anomala collected at a littoral site had higher MeHg than a canal site. These intraspecies contrasts are consistent with the shift toward zooplanktivory in adult H. anomala. As both putative prey for fish and competitors for shared zooplankton resources, H. anomala may impact fish in compounding ways. |
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| Keywords: | Mercury Littoral Mysids Invasive species Stable isotopes Finger Lakes |
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