. The Canadian field-naturalist. 1984 Darby and Pruitt: Woodland Caribou in Southeastern Manitoba 185. 1 Camp â â Trail 0 1 5k 1 Figure I. The Aikens Lake study area. Methods Data on seasonal changes in habitat use, move- ments and group size of Caribou were obtained during 13 flights (36 h) in a Piper PA-12 aircraft, and 1017 person-days of ground investigation involving more than 10000 km of travel by foot, canoe and snow- mobile. Aerial surveys were flown once a month dur- ing March and April 1975, December through April 1976 and December through March 1977, with an additional survey flown
. The Canadian field-naturalist. 1984 Darby and Pruitt: Woodland Caribou in Southeastern Manitoba 185. 1 Camp â â Trail 0 1 5k 1 Figure I. The Aikens Lake study area. Methods Data on seasonal changes in habitat use, move- ments and group size of Caribou were obtained during 13 flights (36 h) in a Piper PA-12 aircraft, and 1017 person-days of ground investigation involving more than 10000 km of travel by foot, canoe and snow- mobile. Aerial surveys were flown once a month dur- ing March and April 1975, December through April 1976 and December through March 1977, with an additional survey flown in March of both 1976 and 1977. During each survey the aircraft flew at 145 km/h, 125 m above ground level, along 11 east- west transects 30 km long, km apart. Two observers, one on either side of the aircraft, recorded all observations of Caribou, Caribou tracks and feed- ing craters, and the habitat type(s) for each observa- tion. Fresh tracks were followed and back-tracked whenever possible. The return trip from each survey was used to check areas peripheral to the transects. Ground investigations involved tracking Caribou dur- ing all seasons. We recorded all observations of Cari- bou, Caribou tracks and pellet groups and the corre- sponding habitat type(s). Travel was facilitated by a system of trails established throughout the study area and by caching boats and canoes on water systems. Field investigations were not conducted during spring break-up (20 April to 10 May). Two adult Caribou were radio-collared during the study. Radio-collars containing AVM model SB~2 transmitters were attached to swimming Caribou and relocations were obtained on foot, from tree towers and by aircraft, using an AVM model LA-12 portable receiver and 4-element Yagi antenna(e). Habitat use by Caribou was determined from records of habitat type for each observation of Cari- bou and Caribou tracks. Radio-tracking data were not used for habitat determination because the error polygons of inte
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