Lesions associated with Orthohalarachne attenuata (Halarachnidae) in the northern fur seal (Callorhinus ursinus
Decline in Northern Fur Seal (Callorhinus ursinus
) pup production on the Pribilof Islands.
Ascaridoid nematodes and associated lesions in stomachs of subadult male northern fur seals (Callorhinus ursinus
) on St.
Their discovery in 1786 by the Russian navigator Pribylov terminated the search for the primary breeding grounds of the northern fur seal, Callorhinus ursinus
, whose pelts were among the most valued in the international fur trade at that time.
Conservation plan for the eastern Pacific stock of northern fur seal (Callorhinus ursinus
Northern fur seal (Callorhinus ursinus
): Eastern Pacific stock.
It is therefore advantageous for the pup to consume milk as rapidly as possible, as found in northern fur seals Callorhinus ursinus
(Costa and Gentry 1986).
At the same time, some Russian hunters were already travelling to Alaska without considering it anything special and they returned with skins of the northern fur seal (Callorhinus ursinus
), the sea otter (Enhydra lutris), and the American marten (Martes americana).
-- which roughly means 'bear with a beautiful nose' -- has been studied for more than a century, by scores of researchers.
Steller sea lions (Eumetopias jubatus), sea otters (Enhydra lutris), and northern fur seals (Callorhinus ursinus
) live along the coast.
Among the pinnipeds, the stellar sea lion (Eumetopias jubatus) and northern fur seal (Callorhinus ursinus
) have high-trophic-level diets consisting primarily of small schooling fish (Burton and Koch, 1999; Kurle and Worthy, 2001; Newsome et al., 2007), whereas the harbor seal is more reliant on near-shore squid and invertebrates.
Steller sea lion (Eumetopias jubatus), northern fur seal (Callorhinus ursinus
), and most recently, harbor seal (Phoca vitulina) populations have all decreased (4-6).
Inter-island variability in the diet of female northern fur seals (Callorhinus ursinus
) in the Bering Sea.
Sea otters were heavily hunted in the North Pacific as well, and when the returns from these hunts began to dwindle, a Russian-American coalition (1803-1812) and independent Russian hunters (1809-1823) heavily exploited southern sea otters, Enhydra lutris, in addition to northern and Guadalupe fur seals, Callorhinus ursinus
and Arctocephalus townsendi, respectively, along the Pacific coast of both Upper and the Lower California.
The diet of transient killer whales in spring was primarily gray whales (Eschrichtius robustus), and in summer primarily northern fur seals (Callorhinus ursinus