. The Canadian field-naturalist. 1989 Scott and Hansell: Lemming Community at Churchill 359. F igure 1. The Churchill area showing the location of the lichen-heath tundra study site (white block) in relation to open forest as well as the fen-bog and beach meadows of the forest-tundra {after Scott by August, the entire area has thawed some 15 m into the rock below (Brown 1978). Complex plant communities occur in relation to microtopography and drainage. These communi- ties form patches ranging from 10 cm to several metres in size. In order to simplify the description, the plant community within
. The Canadian field-naturalist. 1989 Scott and Hansell: Lemming Community at Churchill 359. F igure 1. The Churchill area showing the location of the lichen-heath tundra study site (white block) in relation to open forest as well as the fen-bog and beach meadows of the forest-tundra {after Scott by August, the entire area has thawed some 15 m into the rock below (Brown 1978). Complex plant communities occur in relation to microtopography and drainage. These communi- ties form patches ranging from 10 cm to several metres in size. In order to simplify the description, the plant community within a 5 m radius of each capture site was described by the most dominant appearing species. Small mammal fauna was sampled by snap- trapping during a 16-day period in August 1984. Groups of ten traps were baited with rolled oats and peanut butter and placed around burrows in the centre of either 14 or 15 of the 50 * 50 m quadrats and this process was repeated until all 59 quadrats had been trapped, a total of 2360 trap- days. The specimens were identified and prepared as skins and skulls and deposited in the collection of the department of Mammalogy, Royal Ontario Museum (catalogue numbers 94286-94333). Burrows were counted in five randomly selected 50 x 50 m plots and burrow diameter and length was measured to compare with measurements made by Brooks (1970) on sand-based sites. To assess the work involved in burrowing, a 74 cm column of peat was removed and the peat density was calculated for groups of three samples taken at 3 cm intervals throughout the column. Several more peat columns were taken and the composi- tion was examined. Results A total of 15 community types was described by aspect dominance at successful trap locations (Table 1). Lichens dominate most upland areas and mosses dominate in all other areas. The upland communities were composed of mainly Cetraria nivalis, Bryoria nitidula, and Bryocaulon diver gens with Empetrum nigrum, Arctostaphylos. Please note that t
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