. The Canadian field-naturalist. . ^âºâ ^ % .^MUt^' 4 Figure 1. Aerial photo of the Prudhoe Bay Test Site during August 1971. The installation consists of a 610-m rectangular loop of pipe, of which the western side (left) was fully buried and the eastern side was half buried. Control center is in lower left, static test and road construction simulation test areas are located at right. The Prudhoe Bay spine road crosses lower part of photo. Light-colored barrels outlining the Gas Arctic Systems Study Group leased property were removed to facilitate Caribou encounters with the pi
. The Canadian field-naturalist. . ^âºâ ^ % .^MUt^' 4 Figure 1. Aerial photo of the Prudhoe Bay Test Site during August 1971. The installation consists of a 610-m rectangular loop of pipe, of which the western side (left) was fully buried and the eastern side was half buried. Control center is in lower left, static test and road construction simulation test areas are located at right. The Prudhoe Bay spine road crosses lower part of photo. Light-colored barrels outlining the Gas Arctic Systems Study Group leased property were removed to facilitate Caribou encounters with the pipeline berms. Reticulated ground pattern results from buried ice wedges forming polygons characteristic of many arctic coastal plain areas of high ice content permafrost. industrial installations and oriented in such a manner that Caribou moving between the Sagavanirktok River mouth and western portions of their summer range encountered the pipeline berms. These encoun- ters were documented by visual observations made from an elevated platform constructed adjacent to the control center and downwind of the pipeline loop and from animal tracks in the substrates. Berms were inspected twice daily and raked free of tracks after photographic documentation of each encounter. Ten encounters occurred in 1971 and 24 episodes of Cari- bou-pipeline interactions during 1972 were combined into 21 separate encounters. Results and Discussion The 197! encounters began a few days after bands of 36, 51, and 60 Caribou were observed 3 km north of the facility. The animals initially kept their distance from the test facility probably because the nearby spine road carried appreciable vehicular traffic. Six encounters were visually documented and the other four occurred while I was absent from the facility (usually late evening until early the following morn- ing). Seven encounters were by single animals and three were by two animals each, reflecting the general dispersal of Caribou on their summe
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