ECOLOGY AND BIOLOGY OF THE PACIFIC WALRUS 



ATLANTIC 



Fig. 2. Family tree of the otarioid pinnipeds. (Adapted from Repenning and Tedford 

 1977) 



The single species of living walrus, Odohenus rosmarus, is holarctic in dis- 

 tribution, though by no means uniformly distributed or morphologically alike in 

 all areas. At least six populations around the Northern Hemisphere appear to be 

 geographically isolated at present (Fig. 3) in the (1) Hudson Bay-Davis Strait 

 region, (2) eastern Greenland, (3) Svalbard and Franz Josef Land, (4) Kara 

 Sea-Novaya Zemlya, (5) Laptev Sea, and (6) Bering and Chukchi seas. Of these, 

 the first four are regarded as "the Atlantic walrus," O. r. rosmarus Linnaeus, 



