. The Canadian field-naturalist. Natural history; Sciences naturelles. 324 The Canadian Field-Naturalist Vol. 120. Figure 1. Study area, North Slope, Alaska. Arrows indicate study sites. 1). The Badami pipeline is elevated > m above the tundra surface for > 99% of its length. This pipeline is buried beneath the East Channel of the Sagavanirk- tok, Shaviovik, and Kadleroshilik rivers. At the Saga- vanirktok and Shaviovik rivers, the pipeline is buried for about 1000 m; at the Kadleroshilik River the pipeline is buried for about 400 m. The Sagavanirktok River crossing is split into two
. The Canadian field-naturalist. Natural history; Sciences naturelles. 324 The Canadian Field-Naturalist Vol. 120. Figure 1. Study area, North Slope, Alaska. Arrows indicate study sites. 1). The Badami pipeline is elevated > m above the tundra surface for > 99% of its length. This pipeline is buried beneath the East Channel of the Sagavanirk- tok, Shaviovik, and Kadleroshilik rivers. At the Saga- vanirktok and Shaviovik rivers, the pipeline is buried for about 1000 m; at the Kadleroshilik River the pipeline is buried for about 400 m. The Sagavanirktok River crossing is split into two channels by a large vegetat- ed river bar; requiring two sites to be monitored. The tundra between these river channels is a gently rolling thaw-lake plain landscape with elevation rises of 6 to 8 m (Walker and Acevedo 1987). Time-Lapse Videography We used time-lapse video camera assemblies to monitor Caribou movements between 19 June and 26 August in 2001, 2002, and 2003. Each camera assem- bly consisted of a GYYR™ TLC1800-DC time-lapse videocassette recorder and a Panasonic'^'^' WV-CL 322 color CCTV digital camera equipped with a Compu- tar'^*'' APC auto-iris mm semi wide-angle lens (Pol- lard and Noel 1994*; Noel et al. 1998). Each assembly was powered by four 12-volt, 80-amp sealed lead acid batteries, charged by four Solarex'''^ SX-56 photovolta- ic panels. The video recorder, camera, and batteries were housed in insulated aluminum casings to protect them from weather and animals. The time-lapse video recorders were set to record at 3-4 second intervals. Markers were placed 100 m from each camera to assist in determining visibility and to standardize the area sampled. Cameras had a 72° view angle resulting in a 7260-m- field of view out to 100 m (, the sampling area). Videotapes were changed at 10-13 day intervals. The cameras were arranged as follows at four river crossings (Figure 1): (1) the east side of the buried East Channel Sagavanirktok crossing (E Sag)
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