. The Canadian field-naturalist. 324 The Canadian Field-Naturalist Vol. 99 52_ 51-. so:. 49^ _ T Figure 1. Map of southern Manitoba, showing collecting localities (solid circles), and possible dispersal routes (heavy lines and letters A-D) for fish, connecting Lake Manitoba with the Red and Assiniboine Rivers and Lake Winnipeg. Numbers associated with each collecting locality signify species reported in this paper as follows: 1 Umbra limi, 2 Notropis dorsalis, 3 N. heterodon (Babaluk and Harbicht 1984) A Carpiodes cyprinus, 5 Ictiobus cyphnellus, 6 Moxostoma macrolepidotum, 1 Ictalurus melas,
. The Canadian field-naturalist. 324 The Canadian Field-Naturalist Vol. 99 52_ 51-. so:. 49^ _ T Figure 1. Map of southern Manitoba, showing collecting localities (solid circles), and possible dispersal routes (heavy lines and letters A-D) for fish, connecting Lake Manitoba with the Red and Assiniboine Rivers and Lake Winnipeg. Numbers associated with each collecting locality signify species reported in this paper as follows: 1 Umbra limi, 2 Notropis dorsalis, 3 N. heterodon (Babaluk and Harbicht 1984) A Carpiodes cyprinus, 5 Ictiobus cyphnellus, 6 Moxostoma macrolepidotum, 1 Ictalurus melas, % Noturus flavus, 9 Noturus gyrinus, \0 Fundulus diaphanus, 11 Morone chrysops, 12 Pomoxis annularis. Letters denote interconnections between Lake Manitoba and the Red River/Assiniboine River/Lake Winnipeg system as follows: A) Fairford River; B) Lake St. Martin; C) Dauphin River; together these have been the natural outflow channel from Lake Manitoba to Lake Winnipeg since about 2000 yr BP; D) Assiniboine River Floodway, a man-made outfall channel which carries Assiniboine River water into Lake Manitoba during flooding. Lake Winnipeg (51°58'N) via the present Fairford River, Lake St. Martin and Dauphin River. After about 2600 BP, the Assiniboine began to adopt its present course, entering the Red River at the location of Winnipeg. Since 2000 BP, then, the only continu- ous water connection between the Red River and Lake Manitoba has been by crossing a minimum lin- ear distance of about 200 km of open lacustrine habi- tat in Lake Winnipeg in order to reach the Dauphin River. This has apparently been an effective barrier to movement of Red River fish into Lake Manitoba. This is supported by the fact that, until 1974, there were only two isolated records of any of the five catfish species in the Red River having occurred in Lake Manitoba. A Channel Catfish (Ictaluruspuncta- tus) was recorded from the commercial fishery in 1945. Please note that these images are extracted from sc
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