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NORTHERN FUR SEAL (Callorhinus ursinus): Eastern Pacific Stock
| Content Provider | Semantic Scholar |
|---|---|
| Author | Allen Angliss, Robyn P. |
| Copyright Year | 2014 |
| Abstract | STOCK DEFINITION AND GEOGRAPHIC RANGE Northern fur seals occur from southern California north to the Bering Sea (Fig. 1) and west to the Okhotsk Sea and Honshu Island, Japan. During the summer breeding season, most of the worldwide population is found on the Pribilof Islands in the southern Bering Sea, with the remaining animals on rookeries in Russia, on Bogoslof Island in the southern Bering Sea, on San Miguel Island off southern California (Lander and Kajimura 1982, NMFS 1993), and on the Farallon Islands off central California. Nonbreeding northern fur seals may occasionally haul out on land at other sites in Alaska, British Columbia, and on islets along the west coast of the United States (Fiscus 1983). During the reproductive season, adult males usually are on shore during the 4-month period from May to August, though some may be present until November (well after giving up their territories). Adult females are ashore during a 6-month period (June-November). Following their respective times ashore, fur seals of both genders then move south and remain at sea until the next breeding season (Roppel 1984). Adult females and pups from the Pribilof Islands move through the Aleutian Islands into the North Pacific Ocean, often to the waters offshore of Oregon and California. Adult males generally move only as far south as the Gulf of Alaska in the eastern North Pacific (Kajimura 1984) and the Kuril Islands in the western North Pacific (Loughlin et al. 1999). In Alaska, pups are born during summer months, leave the rookeries in the fall, on average around mid-November but ranging from late October to early December, and generally remain at sea for 22 months before returning to their rookery of birth. There is considerable interchange of individuals between rookeries. Two separate stocks of northern fur seals are recognized within U.S. waters based on the distribution and population response factors of the Dizon et al. (1992) phylogeographic approach: 1) Distribution: continuous during non-breeding season and discontinuous during the breeding season, high natal site fidelity (DeLong 1982, Baker et al. 1995); 2) Population response: substantial differences in population dynamics between the Pribilof Islands and San Miguel Island (DeLong 1982, DeLong and Antonelis 1991, NMFS 1993); 3) Phenotypic differentiation: unknown; and 4) Genotypic differentiation: little evidence of genetic differentiation among breeding islands (Ream 2002, Dickerson et al. 2010). Thus, an Eastern Pacific stock and a California stock are recognized. The California stock is reported separately in the Stock Assessment Reports for the U.S. Pacific Region. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.afsc.noaa.gov/nmml/PDF/sars/ak2000senf-pe.pdf |
| Alternate Webpage(s) | https://storestuff.s3.amazonaws.com/13200_76143381?AWSAccessKeyId=AKIAJBNEEVWEAALCCECQ&Expires=1559044333&Signature=Gs/1mea0i38IdN80wLGnXYf2W9g%3D&response-content-disposition=attachment%3B+filename%3D%22ak2014_northernfurseal-ep%2520508.pdf%22%3B+filename*%3DUTF-8''ak2014_northernfurseal-ep%2520508.pdf |
| Alternate Webpage(s) | https://storestuff.s3.amazonaws.com/13200_76143385?AWSAccessKeyId=AKIAJBNEEVWEAALCCECQ&Expires=1559045059&Signature=3wk5h/ZzmcgBdhGeONQSDyI%2BDU4%3D&response-content-disposition=attachment%3B+filename%3D%22ak2015_northernfurseal-ep%2520508.pdf%22%3B+filename*%3DUTF-8''ak2015_northernfurseal-ep%2520508.pdf |
| Alternate Webpage(s) | http://www.nmfs.noaa.gov/pr/pdfs/sars/ak2000senf-pe.pdf |
| Alternate Webpage(s) | http://www.nmfs.noaa.gov/pr/sars/2013/ak2013_northernfurseal-ep.pdf |
| Alternate Webpage(s) | https://www.afsc.noaa.gov/nmml/PDF/sars/ak1998senf-pe.pdf |
| Alternate Webpage(s) | https://storestuff.s3.amazonaws.com/13200_76143383?AWSAccessKeyId=AKIAJBNEEVWEAALCCECQ&Expires=1559045647&Signature=3SJ67ldmwbdtzZm9nIP1vY2Z%2B3M%3D&response-content-disposition=attachment%3B+filename%3D%22ak2016_northernfurseal-ep%2520508.pdf%22%3B+filename*%3DUTF-8''ak2016_northernfurseal-ep%2520508.pdf |
| Alternate Webpage(s) | http://www.nmfs.noaa.gov/pr/pdfs/sars/ak1998senf-pe.pdf |
| Alternate Webpage(s) | http://www.afsc.noaa.gov/nmml/PDF/sars/ak1998senf-pe.pdf |
| Alternate Webpage(s) | http://www.afsc.noaa.gov/nmml/PDF/sars/ak2000senf-pe.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
