. The Canadian field-naturalist. 1990 GOODCHILD: STATUS OF THE BiGMOUTH BUFFALO 89. Figure 2. North American distribution of the Bigmouth Buffalo, Ictiobus cyprinellus (adapted from Lee et al. 1980). Erie and apparently uncommon (sparse) in the Canadian part of the lake might be explained by the temperature requirements of this species. Its gradual movement into Canadian waters may be the result of an overall chmatic warming trend. Increased turbidity in the lake may also provide access to a tolerant species such as the Bigmouth Buffalo. In a recent study, fish species having the potential to
. The Canadian field-naturalist. 1990 GOODCHILD: STATUS OF THE BiGMOUTH BUFFALO 89. Figure 2. North American distribution of the Bigmouth Buffalo, Ictiobus cyprinellus (adapted from Lee et al. 1980). Erie and apparently uncommon (sparse) in the Canadian part of the lake might be explained by the temperature requirements of this species. Its gradual movement into Canadian waters may be the result of an overall chmatic warming trend. Increased turbidity in the lake may also provide access to a tolerant species such as the Bigmouth Buffalo. In a recent study, fish species having the potential to invade the Great Lakes during a period of climatic warming were identified based on a discriminant function analysis of ecological characteristics. The Bigmouth Buffalo was one of the species that proved to have significant invasion potential (Mandrak 1989). Recently, the Bigmouth Buffalo has been collected from the St. Clair River by the Ontario Ministry of Natural Resources (OMNR) during electrofishing in "areas of concern" in the Great Lakes, as designated by the International Joint Commission. One specimen was electrofished from the northern part of the St. Clair River towards Lake Huron [A0CMNR86]. Two other specimens were collected at the outlet of the Lambton Generating Station [A0CMNR86]. Three additional specimens were collected from the Thames river at Jeanettes Creek [ROM 36582]. Its occurrence in the Bay of Quinte, Lake Ontario [ROM 37952] may be the resuh of an accidental introduction. The species is imported live from the United States and is often sold in Chinese fish markets. OMNR staff (Maple District) collected live specimens of several species not indigenous to Ontario, including Ictiobus cyprinellus, at Toronto markets (G. Goodchild, Fisheries Branch, Ontario Ministry of Natural Resources, Toronto, Ontario; personal communi- cation). A specimen purchased at a Toronto market is in the ROM collection [ROM 0]. Collections of Bigmouth Buffalo from the
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