. The Canadian field-naturalist. . Figure 2. The northern pocket gopher (upper) and plains pocket gopher (lower). Note the larger size, grooved upper incisors and proportionately larger claws of the plains species. Manitoba are therefore a continuation of a wide- spread pattern. A comparison of their total ranges in North America (Hall and Kelson 1959, Maps 268 and 272) suggests that, after the retreat of the Wisconsin glaciers, Thomomys invaded Manitoba from the southwest, while Geomys moved in from the southeast. We speculate that since Thomomys is a more northerly adapted species, it probab
. The Canadian field-naturalist. . Figure 2. The northern pocket gopher (upper) and plains pocket gopher (lower). Note the larger size, grooved upper incisors and proportionately larger claws of the plains species. Manitoba are therefore a continuation of a wide- spread pattern. A comparison of their total ranges in North America (Hall and Kelson 1959, Maps 268 and 272) suggests that, after the retreat of the Wisconsin glaciers, Thomomys invaded Manitoba from the southwest, while Geomys moved in from the southeast. We speculate that since Thomomys is a more northerly adapted species, it probably arrived in the Roseau River area first, and was later partially excluded by an invasion of the more competitive Geomys. The replacement of Geomys. 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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