2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 9:45 AM - 10:00 AM | FISHERIES FOOD WEB EFFECTS OF ZEBRA MUSSELS AND SPINY WATER FLEA IN LARGE NORTH TEMPERATE LAKES | 250 DE
FISHERIES FOOD WEB EFFECTS OF ZEBRA MUSSELS AND SPINY WATER FLEA IN LARGE NORTH TEMPERATE LAKES
Zebra mussels Dreissena polymorpha (ZM) and spiny water flea Bythotrephes longimanus (SWF) are non-native aquatic invasive species (AIS) in North America. Both species can dramatically alter zooplankton biomass, phytoplankton communities, and water clarity; however, how these impacts transmit to higher levels of the food web is not well understood. We compared trophic position and percent littoral versus pelagic resource contribution to age-0 and adult sport fish across nine large (> 6,400 ha) Minnesota lakes at various stages of invasion by ZM and SWF. We also quantified changes in growth of age-0 walleye, Sander vitreus, and yellow perch, Perca flavescens, using historical data. We found substantial variation in the percent littoral resource contribution to fish across lakes which followed patterns of invasion status. Walleye and yellow perch in invaded lakes relied more heavily on pelagic resources, despite reductions in pelagic plankton biomass. Furthermore, age-0 walleye grew more slowly and were on average 14 and 12% smaller at the end of the growing season when ZM and SWF were present, respectively. These findings suggest that continued reliance on pelagic energy resources following AIS establishment may have negative consequences for sport fish.
- Invasives
- Management
- Fish
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Presenters/Authors
Bethany Bethke
(), Minnesota Department of Natural Resources, bethany.bethke@state.mn.us;
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Gretchen Hansen
(), University of Minnesota, ghansen@umn.edu;
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Tyler Ahrenstorff
(), Minnesota Department of Natural Resources, tyler.ahrenstorff@state.mn.us;
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Heidi Rantala
(), Minnesota Department of Natural Resources, heidi.rantala@state.mn.us;
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Valerie Brady
(), Natural Resources Research Institute, University Minnesota Duluth, vbrady@d.umn.edu;
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Josh Dumke
(), Natural Resources Research Institute, University of Minnesota, jddumke@d.umn.edu;
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Will French
(), Minnesota Department of Natural Resources, will.french@state.mn.us;
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Jodie Hirsch
(), Minnesota Department of Natural Resources, jodie.hirsch@state.mn.us;
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Katya Kovalenko
(), Natural Resources Research Institute, Univ. Minnesota Duluth, philarctus@gmail.com;
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Ryan Maki
(), Voyageurs National Park, ryan_maki@nps.gov;
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Holly Wellard Kelly
(), University of Minnesota-Duluth NRRI, hwellard@d.umn.edu;
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