Distribution of the Ponto-Caspian Amphipod Echinogammarus ischnus in the Great Lakes and Replacement of Native Gammarus fasciatus |
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| Affiliation: | 1. Great Lakes Lab. for Fisheries, Fisheries and Oceans, Canada Centre for Inland Waters, Box 5050, Burlington, Ontario L7R 4A6;2. Dept. of Zoology, University of Guelph, Guelph, Ontario NIG 2W1;3. Dept. of Biological Sciences, Wright State University, Dayton, Ohio 45435-0001;1. Division of Crop Protection and Plant Health, Crop Research Institute, Drnovská 507, 16106 Prague 6, Ruzyně, Czech Republic;2. Plant Pathology Laboratory, TERRA-Gembloux Agro-Bio Tech, University of Liège, Passage des Déportés 2, 5030, Gembloux, Belgium;3. Wageningen Plant Research, Wageningen UR, GTB Gewasgezondheid Bodem en Water, PO Box 20, 2665 ZG, Bleiswijk, the Netherlands;1. Department of Biology, Faculty of Science, Razi University, Kermanshah, Iran;2. School of Biology and Centre of Excellence in Phylogeny of Living Organisms, College of Science, University of Tehran, Tehran, Iran;3. Department of Biology, Biotechnical Faculty, University of Ljubljana, Ve?na pot 111, SI-1000 Ljubljana, Slovenia;1. Institute of Nature Conservation, Polish Academy of Sciences, Kraków, Poland;2. Institute of Ecology and Evolution, University of Bern, Bern, Switzerland;1. Hydraulic Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, China;2. State Key Laboratory of Lake Science and Environment, Nanjing 210008, China;3. Changjiang Institute of Survey, Planning, Design and Research, Shanghai Department, Shanghai 200439, China |
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| Abstract: | The gammarid amphipod Echinogammarus ischnus was found to be widespread from the south end of Lake Huron, downstream in the St. Clair River and across Lake Erie to the Niagara River outlet into Lake Ontario. The presence of this exotic species was first reported in the Detroit River, where it now dominates; this species has been common in western Lake Erie since the summer of 1995. The species has replaced the native amphipod Gammarus fasciatus on rocky habitats in the St. Clair, Detroit, and Niagara rivers, and is the dominant amphipod on rocky shores in western Lake Erie. In one year, E. ischnus became the dominant amphipod at the Lake Ontario end of the Welland Canal, although the fecundity of E. ischnus is less than G. fasciatus. E. ischnus has not yet been reported from the north shore of Lake Ontario or the outlet into the St. Lawrence River but occurs 100 km further downstream at Prescott. |
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