A preliminary survey of the freshwater mussels of the Bayfield River watershed and nearby Lake Huron tributaries / by T.J. Morris, K.A. McNichols-O'Rourke and A. Robinson.: Fs97-4/2993E-PDF

"Surveys of the freshwater mussels (Unionidae) of the Bayfield River watershed and smaller nearby Lake Huron tributaries in southwestern Ontario were undertaken by Fisheries and Oceans Canada in 2007 and 2008, respectively. Eighteen sites were sampled along the Bayfield River, from both the main channel and its tributaries. A total of 1385 animals were found, representing 16 species. The dominant species in the Bayfield River watershed was Pyganodon grandis, which occurred at over half of the sites surveyed, and represented 44% of all mussels found. Two provincially listed mussel Species at Risk, Quadrula quadrula and Villosa iris, were detected. A single Q. quadrula was observed whereas Villosa iris occurred at 28% of sites and represented 2% (33 of 1385) of all mussels found. A total of 19 Lake Huron tributary sites were sampled both north and south of the Bayfield River. A total of nine mussels, representing two species, were found at one site. The dominant species was also Pyganodon grandis. No Species at Risk were detected during these surveys"--Abstract, page v.

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