. The Canadian field-naturalist. 116 The Canadian Field-Naturalist Vol. 102. Figure 2. Map of southern Yukon Territory showing lakes in which the Squanga Whitefish probably occurs (or occurred) and limits of Yukon River and Alsek River basins. extends over a much greater range of gill raker numbers than is usual for most populations of Lake Whitefish in the Yukon Territory (Figure 3). Also, Coregonus from this lake are bimodal with respect to gill raker length (Lindsey 1981), another character known to differ between Lake Whitefish and Squanga Whitefish. Aside from the gill raker apparatus, Sq
. The Canadian field-naturalist. 116 The Canadian Field-Naturalist Vol. 102. Figure 2. Map of southern Yukon Territory showing lakes in which the Squanga Whitefish probably occurs (or occurred) and limits of Yukon River and Alsek River basins. extends over a much greater range of gill raker numbers than is usual for most populations of Lake Whitefish in the Yukon Territory (Figure 3). Also, Coregonus from this lake are bimodal with respect to gill raker length (Lindsey 1981), another character known to differ between Lake Whitefish and Squanga Whitefish. Aside from the gill raker apparatus, Squanga Whitefish are morphologically extremely similar to Lake Whitefish. Despite the very obvious external similarity between Squanga Whitefish and the sympatric Lake Whitefish, Bodaly (1979) has shown that statistically significant differences do exist for such morphological characters as gill raker length, distance between gill rakers, size of the head and length of the fins relative to the size of the body. Similar sympatric pairs of Coregonus are known from lakes in Maine (Fenderson 1964; Kirkpatrick and Selander 1979), in Gabbro and Ossokmanuan Lakes, Labrador (Bruce 1984), from Lac Temiscouata, Quebec (Lindsey 1979), from Opeongo Lake, Ontario (Kennedy 1943; P. E. Ihssen, Ontario Ministry of Natural Resources, Fisheries Research, Maple, Ontario, personal communication) and other lakes in Ontario and Quebec and were known from Dragon Lake, British Columbia (Lindsey et al. 1970). However, the Squanga Whitefish is not closely related to any member of these other populations. Lindsey et Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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