. The Canadian field-naturalist. 220 The Canadian Field-Naturalist Vol. 94 from the late 1800s and early 1900s, and summarized by Rand 1946) came primarily from coastal areas because of the difficulty of travel inland. Recent stu- dies have not been so restricted, and have often been more systematic and quantitative. During 1971-1976 LGL Limited conducted several studies in this area for both industry and government. In this paper, we summarize data obtained during this period on avian distribution, abundance, habitat relationships, and seasonal movements. We also provide a guide to reports th
. The Canadian field-naturalist. 220 The Canadian Field-Naturalist Vol. 94 from the late 1800s and early 1900s, and summarized by Rand 1946) came primarily from coastal areas because of the difficulty of travel inland. Recent stu- dies have not been so restricted, and have often been more systematic and quantitative. During 1971-1976 LGL Limited conducted several studies in this area for both industry and government. In this paper, we summarize data obtained during this period on avian distribution, abundance, habitat relationships, and seasonal movements. We also provide a guide to reports that present the original data on which this summary is based. Study Area The area for which records are summarized encom- passes a narrow strip of extreme northern Yukon and adjacent Northwest Territories, bounded on the west by the Alaska-Yukon border and on the east and northeast by the western edge of the Mackenzie Delta (Figure 1). The northern boundary is the Beaufort Sea to the limit of visibility from the coast of offshore islands. The arbitrary southern boundary is the 305-m (1000-ft) contour from the Alaska border to the vicin- ity of Cache Creek, then east along 68°25'N to the Mackenzie Delta. The study area measures ~250 km east-west and a maximum of ~55 km north-south. This region encompasses the Canadian portion of the Arctic Coastal Plain (Bostock 1961; Welsh and Rigby 1971), a natural physiographic unit that reaches its greatest extent in Alaska (Wahrhaftig 1965). Its southern margin rises into the Arctic Plateau, a rolling foothill area 305-610 m asl bordering the British, Barn (Figure 2), and Richardson mountains, and extending southward between the mountains along the upper reaches of Babbage and Blow rivers. The mountains reach maximum elevations of 1600 m 50- 100 km from the coast. From the 305-m contour the Coastal Plain slopes gradually down to sea-level, with little local relief except along incised river valleys. Drainage is through numerous rivers and s
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