. The Canadian field-naturalist. 422 The Canadian Field-Naturalist Vol. 94. Figure I. Polynias surveyed in the central Canadian high Arctic and numbers of guillemots seen. gan Strait on 19 April 1977; one small polynia near Dundas Island and the Hell Gate ~ Cardigan Strait polynia were again surveyed on 17 March 1978 (Fig- ure 1). In northwest Baffin Bay and adjacent areas, extensive surveys were undertaken on 15-16 March 1978(1448 km surveyed), 18-20 April 1978(1506 km), and 17 March 1979 (1158 km) (Figure 2). Surveys of northwest Baffin Bay and the Hell Gate and Cardigan Strait polynia follo
. The Canadian field-naturalist. 422 The Canadian Field-Naturalist Vol. 94. Figure I. Polynias surveyed in the central Canadian high Arctic and numbers of guillemots seen. gan Strait on 19 April 1977; one small polynia near Dundas Island and the Hell Gate ~ Cardigan Strait polynia were again surveyed on 17 March 1978 (Fig- ure 1). In northwest Baffin Bay and adjacent areas, extensive surveys were undertaken on 15-16 March 1978(1448 km surveyed), 18-20 April 1978(1506 km), and 17 March 1979 (1158 km) (Figure 2). Surveys of northwest Baffin Bay and the Hell Gate and Cardigan Strait polynia followed the edge of the landfast ice; smaller polynias were surveyed completely in one or more passes of the aircraft. Ice Conditions During winter and early spring, pack ice almost completely covers northwest Baffin Bay, Lady Ann Strait, southern Smith Sound, and usually Lancaster Sound. With the exception of a few polynias, the waters among the arctic islands are solidly frozen north of Smith Sound and west of eastern Jones Sound, and usually also from eastern Barrow Strait westward (cf., Canadian Hydrographic Service 1970; Aber and Vowinckel 1972; Lindsay 1975). Polynias, the largest of which is located at Hell Gate and Cardi- gan Strait, occur around western and northwest Devon Island (Lindsay 1975; NOAAandLANDSAT imagery). In 1978 and 1979, Lancaster Sound was solidly frozen during the winter and an ice edge persisted across the eastern entrance until mid-summer. Cracks and leads occurred intermittently along all ice edges surveyed (Figure 2,) but were most extensive (up to several kilometres wide) in Glacier Strait, eastern Jones Sound, and (in April 1978) eastern Lancaster Sound. Extensive thin ice was present throughout Lady Ann Strait and more locally off southeast Devon Island. During all surveys, pack ice covered more than 99% of Baffin Bay but new cracks and leads were continually being formed among the shifting pans. Ice edges were well-defined except off northwest Gre
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