. The Canadian field-naturalist. 1990 Lien and Barry: Status of Sowerby's Beaked Whale 127. Figure 2. Photograph oi the 362 cm female stranded at Bay of Exploits, Newfoundland in September 1987 (see Table 1). Note the "V" shaped throat groove. presence of the unusual rostrum, it is likely that most stranded Mesoplodon bidens would be reported. Although the number of strandings reported in recent years has increased, it can not be concluded that Mesoplodon bidens has become more common in Canadian waters in the past decade. The increased scope and efficiency of present stranding netwo
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. The Canadian field-naturalist. 1990 Lien and Barry: Status of Sowerby's Beaked Whale 127. Figure 2. Photograph oi the 362 cm female stranded at Bay of Exploits, Newfoundland in September 1987 (see Table 1). Note the "V" shaped throat groove. presence of the unusual rostrum, it is likely that most stranded Mesoplodon bidens would be reported. Although the number of strandings reported in recent years has increased, it can not be concluded that Mesoplodon bidens has become more common in Canadian waters in the past decade. The increased scope and efficiency of present stranding networks, where effort is difficult to quantify, may well bias conclusions about the relative abundance of the species. However, earUer suggestions that the distribution of Mesoplodon bidens enters in the North Sea and only occasionally wanders to western North Atlantic waters (Moore 1966) should perhaps be regarded as premature. Habitat There are, at present, inadequate data to identify habitat requirements of Mesoplodon bidens. Sightings of ziphiids have been common along the edges of temperature fronts in water depths of approximately 200 m (Price and Fairfield 1985) which is consistent with a sighting of Mesoplodon bidens by Marion et al. (1987). However, Mesoplodon bidens sightings have also occurred in waters of depths greater than 1500 m ((/)ynes 1974; Christensen 1977). If Mesoplodon bidens is a pelagic species that only occasionally visits coastal waters, one might expect mass strandings of the species (Sergeant 1982; Tyack 1987). In the past three decades, the ratio of mass to single Canadian strandings of Mesoplodon bidens is 2:1. For British shores, the mass to single stranding ratio of Mesoplodon bidens is 1:29 (Sheldrick 1979). Sheldrick (1979) makes the point that mass strandings are generally considered rare for all species on British coasts. Table 1. Records of Me.$o/7/o(io« fe/Wen^ in North America (1867-1' Date Location Details Source 1867 Nantucket Island, Massa