. The Canadian field-naturalist. Figure I. Atlantic Walrus {Odobenus rosmarus rosmarus). probably be included with Odobenus rosmarus divergens. The Pacific subspecies is generally 4 to 7% larger than the Atlantic form and develops larger tusks (Heptner et al. 1976; Fay 1982). The adult male Pacific Walrus has a broader snout and more massive neck and shoulder musculature than its Atlantic relative (Allen 1880; Fay 1982). On the average Atlantic Walrus in Canadian waters weigh 55 kg at birth and measure m standard length. Adult females reach a mean weight of 560 kg and a length of m whi
. The Canadian field-naturalist. Figure I. Atlantic Walrus {Odobenus rosmarus rosmarus). probably be included with Odobenus rosmarus divergens. The Pacific subspecies is generally 4 to 7% larger than the Atlantic form and develops larger tusks (Heptner et al. 1976; Fay 1982). The adult male Pacific Walrus has a broader snout and more massive neck and shoulder musculature than its Atlantic relative (Allen 1880; Fay 1982). On the average Atlantic Walrus in Canadian waters weigh 55 kg at birth and measure m standard length. Adult females reach a mean weight of 560 kg and a length of m while the larger males reach a mean weight of 900 kg and a length of m. The largest recorded weight of a male Walrus in Canada is 1270 kg (Mansfield 1964). Distribution The modern Walrus is holarctic in occurrence; the animals principally inhabit the moving pack ice over the shallow waters of the continental shelf. They seem to prefer to haulout on ice but will use the land where there is no ice (Fay 1981). The distribution is not uniform and there are morphological differences between populations. At the present time there are thought to be six main populations (Figure 2) which appear to be geographically isolated (Fay 1982). The larger Pacific Walrus occurs in the Bering and Chukchi seas, and the five populations of the smaller Atlantic Walrus are distributed in waters of the North Atlantic and Arctic oceans. These are: (1) in the Hudson Bay-Davis Strait region, (2) eastern. Figure 2. World distribution of Walrus showing the six populations (from Fay 1982).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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