. The Canadian field-naturalist. 1991 Wrigley, Dubois, and Copland: Prairie Rodents in Manitoba. Figure 1. Trapped Plains Pocket Gopher at its burrow near Ridgeville, Manitoba (R. E. Wrigley). peaks, December to January and April to June (Jones et al. 1983). We suspect there are also two litters produced annually in Manitoba, with most mating occurring in February-March and June- July, and births in March-April and July-August. Plains Pocket Gopher, Geomys bursarius. In 1911, H. Douthitt collected two specimens of the Plains Pocket Gopher (Figure 1) at the border town of Emerson, Manitoba - th
. The Canadian field-naturalist. 1991 Wrigley, Dubois, and Copland: Prairie Rodents in Manitoba. Figure 1. Trapped Plains Pocket Gopher at its burrow near Ridgeville, Manitoba (R. E. Wrigley). peaks, December to January and April to June (Jones et al. 1983). We suspect there are also two litters produced annually in Manitoba, with most mating occurring in February-March and June- July, and births in March-April and July-August. Plains Pocket Gopher, Geomys bursarius. In 1911, H. Douthitt collected two specimens of the Plains Pocket Gopher (Figure 1) at the border town of Emerson, Manitoba - the first records for Canada. They are catalogued in the United States National Museum and were referred to by Bailey (1926) in his biological survey of North Dakota. Soper (1944) collected an additional ten specimens in an area km ( mi) ENE of Emerson. Wrigley and Dubois (1973) added another 29 specimens and delineated the range south of the Roseau River, and bounded on the east, north, and west by populations of the Northern Pocket Gopher (Thomomys talpoides). With the assist- ance of M. Oberpichler, we have now accumulated a total of 147 specimens taken in sand, rich loam, and to a limited extent, glacial till. This area was formerly tall-grass prairie and deciduous forest, but is now heavily cultivated. Most pocket gophers were restricted to abandoned land, the edges of farm fields, and the banks of roads (Figure 2), railroads, and drainage ditches. Extensive areas were uninhabited, presumably because the low relief of the land provided no burrow sites protected from the excess water that frequently floods these lowlands in spring, or because of low aeration of clay soils present in the Red River Valley. Downhower and Hall (1966) reported that in Kansas this species inhabited soils with at least 40 percent sand, and avoided poorly aerated soils of silt and clay. In Manitoba, fields of alfalfa and hay were much preferred over cereal crops and fallow. The number of poc
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