. The Canadian field-naturalist. 1996 Pollard, Ballard, Noel, and Cronin: Summer Distribution of Caribou 663. 1 Aua 1990 No of Groups Rmae in Range • -10 87 • 10-100 1 9 100-1000 0 A 1nnn n fl ^<^' V . Figure 2 c. See caption on facing page. adults). Data were entered into a laptop computer linked to the GPS receiver in the airplane. Locations of Caribou groups were determined by using GPS coordinates recorded on the transect line corrected with the visual estimation of their distances from the transect line. Caribou data were combined with digi- tal base-map data in Maplnfo® (Maplnfo Corp.
. The Canadian field-naturalist. 1996 Pollard, Ballard, Noel, and Cronin: Summer Distribution of Caribou 663. 1 Aua 1990 No of Groups Rmae in Range • -10 87 • 10-100 1 9 100-1000 0 A 1nnn n fl ^<^' V . Figure 2 c. See caption on facing page. adults). Data were entered into a laptop computer linked to the GPS receiver in the airplane. Locations of Caribou groups were determined by using GPS coordinates recorded on the transect line corrected with the visual estimation of their distances from the transect line. Caribou data were combined with digi- tal base-map data in Maplnfo® (Maplnfo Corp., 200 Broadway, Troy, New York 12180) and mapped for each survey. For mapping purposes Caribou group size was categorized into four size classes: 1000 individuals. During 1992 and 1993, we systematically moni- tored weather patterns and insect activity on a daily basis (Pollard et al. 1996). Weather variables were measured using automated weather stations and hand- held instruments (Pollard et al. 1996). Insect abun- dance was measured using sweep nets, insect traps, and ground observations of Caribou. Insect activity during 1990 and 1991 was subjectively estimated based on ground observation before and after surveys, and by interviews with field technicians located on the ground during aerial surveys. We classified relative insect activity as relatively low, moderate, or high. Insect activity was not measured during 1994. Results Distribution and abundance of Caribou within the study area was highly variable within and among years (Table 1). Numbers of Caribou observed on any survey ranged from 34 to 13 058. Movement of Caribou through the oil field appeared to be directly related to insect activity. In general, when insect activity was low, most Caribou moved inland away from the coast and insect-relief habitat within the oil field. However, when insect activity was moderate or high. Caribou either were present within or were moving through the oil field to reach insect-
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