. The Canadian field-naturalist. 19 July 1992 No of Groups Range in Range. Figure 4 a-b. Distribution of Caribou observed in the study area during eight aerial surveys conducted during 9 July-3I July 1992. Solid lines are roads or pipelines and rectangles are gravel pads which support oil field facilities. study area during the survey, most of which were in small groups south of the PBOF near the Sagavanirktok River (Figure Ab) and scattered throughout the PBOF. Insect activity was low dur- ing this survey. During the 19 July survey, 7644 Caribou were observed in the study area (Table 1). Obse
. The Canadian field-naturalist. 19 July 1992 No of Groups Range in Range. Figure 4 a-b. Distribution of Caribou observed in the study area during eight aerial surveys conducted during 9 July-3I July 1992. Solid lines are roads or pipelines and rectangles are gravel pads which support oil field facilities. study area during the survey, most of which were in small groups south of the PBOF near the Sagavanirktok River (Figure Ab) and scattered throughout the PBOF. Insect activity was low dur- ing this survey. During the 19 July survey, 7644 Caribou were observed in the study area (Table 1). Observations from this survey, and ground-based observations conducted during 20-22 July, indicated large groups of Caribou moved through the PBOF on these dates. Insect activity (mosquitoes and oestrid flies) was moderate to high on 19-22 July. Many Caribou were on gravel roads and pads, or in the shade of build- ings and pipelines. These Caribou displayed signs of insect harassment (, shaking their heads, bodies, and twitching their tails, and kicking) (Pruitt 1960; Espmark 1968; Kelsall 1968; Skoog 1968; Curatolo 1975; Dau 1986). Caribou remained on the gravel. 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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