. The Canadian field-naturalist. 60 The Canadian Field-Naturalist Vol. 95 PRUDHOE BAY TEST SITE CARIBOU-PIPELINE ENCOUNTERS 1971. Figure 3. Schematic diagram illustrating routes of Caribou involved in 10 pipeline encounter episodes from 23 July to 2 August 1971. Detailed routes are shown to illustrate avoidance of higher ( m) berms in south- east sector and pools of water in subsidence craters in northwest sector. that of Caribou encountering "topographic confine- ment" at a nearby study area (Child 1974). These areas were reclaimed by adding topsoii during April 1972, so that the
. The Canadian field-naturalist. 60 The Canadian Field-Naturalist Vol. 95 PRUDHOE BAY TEST SITE CARIBOU-PIPELINE ENCOUNTERS 1971. Figure 3. Schematic diagram illustrating routes of Caribou involved in 10 pipeline encounter episodes from 23 July to 2 August 1971. Detailed routes are shown to illustrate avoidance of higher ( m) berms in south- east sector and pools of water in subsidence craters in northwest sector. that of Caribou encountering "topographic confine- ment" at a nearby study area (Child 1974). These areas were reclaimed by adding topsoii during April 1972, so that the Caribou then used the areas regularly (Figure 4). Most Caribou appeared wary of deflection poles, thermocouple planes, and boardwalks and usually avoided them. However, during 1972 a large-antlered bull walked atop the east berm for a distance of 130 m, tilting his antlers to avoid the crossarms of eight deflection poles in his path. Clearance under the cross- arms ranged from to m. He then continued a course toward an elevated ( m) effluent line, which he coursed for 56 m before lightly touching his antlers to the wooden housing 2 3 times at a point where clearance was m. He then continued to a point where clearance increased to m and passed under the line. The animal was under moderate to severe insect harassment during the episode. PRUDHOE BAY TEST SITE CARIBOU-PIPELINE ENCOUNTERS 1972. 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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