Contemporary genetic structure of walleye (Sander vitreus) reflects a historical inter-basin river diversion |
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| Authors: | Chris C. Wilson Tim J. Haxton |
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| Affiliation: | 1. Department of Soil Science, University of Manitoba, 13 Freedman Crescent, Winnipeg, Manitoba R3T 2N2, Canada;2. Centre for Earth Observations Sciences, Department of Geography and Environment Studies, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada;3. Environmental Science Program and Quesnel River Research Centre, University of Northern British Columbia, 3333 University Way, Prince George, British Columbia V2N 4Z9, Canada;1. Centre for Earth Observation Science, University of Manitoba, Winnipeg, MB, Canada;2. Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada;3. Department of Botany, University of British Columbia, Vancouver, BC, Canada;1. Department of Remote Sensing and GIS, University of Tehran, Tehran, Iran;2. Department of Physical Geography, University of Tehran, Tehran, Iran;3. Iranian National Institute for Oceanography and Atmospheric Science (INIOAS), Tehran, Iran;1. Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, 125 Dysart Road, Winnipeg, Manitoba R3T 2M6, Canada;2. Freshwater Institute, Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, Manitoba R3T 2N6, Canada;1. Department of Fisheries and Wildlife, 480 Wilson Road, 13 Natural Resources Building, Michigan State University, East Lansing, MI 48864, United States;2. Department of Microbiology and Molecular Genetics, 567 Wilson Road, 2215 Biomedical Physical Sciences Building, Michigan State University, East Lansing, MI 48864, United States;3. Department of Integrative Biology, 288 Farm Ln, Natural Sciences Building, Michigan State University, East Lansing, MI 48864, United States;1. Department of Fisheries and Wildlife, Michigan State University, 480 Wilson Rd, East Lansing, MI 48824, USA;2. Department of Integrative Biology, Michigan State University, 252 Farm Ln., East Lansing, MI 48824, USA;3. Ecology, Evolution, and Behavior Program, 103 Giltner Hall, 293 Farm Lane, East Lansing, MI 48824, USA |
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| Abstract: | River diversions can have unexpected biological consequences. In the mid-20th century, the upper Ogoki River in northern Ontario was diverted from its original Hudson Bay drainage to flow into the Great Lakes. Although walleye were present in both systems prior to the diversion, the Hudson Bay and Great Lakes watersheds had previously been separated since the early Holocene (7500–8500 years ago). We assessed the effects that this inter-basin diversion has had on the genetic structure of two formerly allopatric populations. We assessed the genetic structure and diversity of walleye in the Ogoki and Little Jackfish river systems and Lake Nipigon (number, distribution, and divergence of identified genetic groups) and quantified the contribution of fish from the historical population (Hudson Bay drainage Ogoki River) and Lake Nipigon to walleye in the Ogoki and Little Jackfish Rivers. Walleye from Ogoki Lake, the Ogoki River diversion through the Little Jackfish River, Lake Nipigon and Nipigon Bay were genotyped at 10 microsatellite loci. Significant genetic differences were detected among sampling locations: walleye from Ogoki Lake, presumably representing fish originally from the historical Ogoki River gene pool, were genetically similar to but statistically distinct from walleye within the diversion. Walleye from sample sites within the diversion and Ombabika Bay appear to form a single genetic group that is largely derived from the Ogoki watershed and differs significantly from walleye in Lake Nipigon and Nipigon Bay. Our findings confirm that the historical river diversion has had long-term effects on the genetic composition of contemporary walleye populations. |
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| Keywords: | River diversion Ogoki River Inter-basin Walleye Genetics |
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