. The Canadian field-naturalist. 1992 Gaskin: Status of the Common Dolphin 59. Figure 3. Shaded area indicates the regular, or seasonal, zones of occurrence of Delphinus delphis off eastern Canada. Strays will occur outside this area, and the range may extend further offshore than shown, a — Newfoundland, b — Nova Scotia, c — New Brunswick, d — Bay of Fundy, e — Gulf of Maine, f — Flemish Cap. [No range map for the west coast is shown as the species is only a rare stray north of Oregon]. Baja region respectively. Long and short-snouted herds sometimes overlapped, but there did not seem to be m
. The Canadian field-naturalist. 1992 Gaskin: Status of the Common Dolphin 59. Figure 3. Shaded area indicates the regular, or seasonal, zones of occurrence of Delphinus delphis off eastern Canada. Strays will occur outside this area, and the range may extend further offshore than shown, a — Newfoundland, b — Nova Scotia, c — New Brunswick, d — Bay of Fundy, e — Gulf of Maine, f — Flemish Cap. [No range map for the west coast is shown as the species is only a rare stray north of Oregon]. Baja region respectively. Long and short-snouted herds sometimes overlapped, but there did not seem to be mixing. Evans (1976) speculated that statisti- cally significant differences in the width of the right premaxilla and the greatest width of the external nares might be related to different vocalization capa- bilities along latitudinal clines as a result of adapta- tion to different prey species. Protection Small cetaceans were not protected under the origi- nal terms of the International Whaling Convention of 1946. In Canada, the Cetacean Protection Regulations of 1982, which were promulgated under the Fisheries Act, prohibit the catching or harassment of all species, including delphinids such as the Common Dolphin. Scientific sampling may be permitted under specific licences after thorough review of the application by the Department of Fisheries and Oceans. Population Sizes and Trends Western North Atlantic Winn (1982) used sighting data from the CeTAP surveys of 1978 to 1982 to make some estimates of population sizes in the western North Atlantic. Although the survey did not include the Atlantic coast of Nova Scotia, this may introduce only a rather small additional error as winter surface tem- peratures on the shelf drop to 4 to 6°C. Under these circumstances, if the population stays on the shelf, all should be within the CeTap survey even in win- ter. The possibility remains that this segment may be more pelagic and move south. In that case, the size of the enti
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