Polar Biology

, Volume 3, Issue 1, pp 11–18 | Cite as

Seal eating by walruses in the Bering and Chukchi Seas

  • L. F. Lowry
  • F. H. Fay


Walruses (Odobenus rosmarus) feed primarily on benthic invertebrates, but they are known to eat seals (Phocidae) occasionally, ostensibly when the benthic foods are unavailable. We investigated reports of a marked increase in occurrence of seal-eating walruses in the Bering Strait region in the late 1970's by examining stomach contents of animals taken in the spring harvests by Eskimos. We also obtained relevant information during visual surveys of marine mammals in the region. Our findings from the stomachs indicated that seal eating was 10 to 100 times more common during the 1970's and early 1980's (0.6–3.0%, N=645) than it had been in the previous three decades (0.07–0.20%, N=4015). In addition, we observed walruses in possession of seal remains in 1978 and 1979, where we had not seen such a phenomenon before in the previous 25 years. We attribute the increased predatory interaction between seals and walruses partly to a larger walrus population and, especially in 1979, to unusually restrictive spring ice conditions, which tended to cause greater than usual overlap of their distributions. Stomach contents of walruses taken in the Chukchi Sea in summer, where the ranges of walruses and seals overlap broadly in all years, have indicated a similarly high rate of occurrence of seal eaters (8.6% in the 1960's, N=35; 11.4% in 1983, N=44). As a whole, our findings indicate that most of the seal eating is predation, rather than scavenging of carrion. They also indicate that it is not rare or aberrant but common behavior, and that it could exert a significant impact on seal populations in some areas.


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  1. Braham HW, Burns JJ, Fedoseev GA, Krogman BD (1984) Habitat partitioning by ice-associated pinnipeds: distribution and density of seals and walruses in the Bering Sea, April 1976. In: Fay FH, Fedoseev GA (eds) Soviet-American cooperative research on marine mammals, vol 1, Pinnipeds. Natl Mar Fish Serv Circ Tech Rep (in press)Google Scholar
  2. Brooks JW (1954) A contribution to the life history and ecology of the Pacific walrus. Spec Rep 1, Alaska Cooperative Wildlife Research Unit, University of Alaska, Fairbanks, 103 ppGoogle Scholar
  3. Burns JJ (1965) The walrus in Alaska: its ecology and management. Alaska Dep Fish and Game, Juneau, 48 ppGoogle Scholar
  4. Burns JJ, Shapiro LH, Fay FH (1980) The relationships of marine mammal distributions, densities and activities to sea ice conditions. In: Environmental assessment of the Alaskan continental shelf, final reports of principal investigators, vol 11, biological studies. NOAA Office of Marine Pollution Assessment, Juneau, Alaska, pp 489–670Google Scholar
  5. Chapskii KK (1936) The walrus of the Kara Sea. Trudy Vsesoiuz Arkt Inst, Leningrad 67:1–124Google Scholar
  6. Fay FH (1960) Carnivorous walrus and some arctic zoonoses. Arctic 13:111–122Google Scholar
  7. Fay FH (1981) Modern populations, migrations, demography, trophics and historical status of the Pacific walrus. In: Environmental assessment of the Alaskan continental shelf, annual reports of principal investigators 1981, vol 1. NOAA Office of Marine Pollution Assessment, Juneau, Alaska, pp 191–234Google Scholar
  8. Fay FH (1982) Ecology and biology of the Pacific walrus, Odobenus rosmarus divergens Illiger. U S Fish Wildl Serv N Am Fauna no 74, 279 ppGoogle Scholar
  9. Fay FH, Feder HM, Stoker SW (1977) An estimation of the impact of the Pacific walrus population on its food resources in the Bering Sea. Final Rep U S Marine Mammal Commission, PB-273-505, National Technical Information Service, Springfield Va, 38 ppGoogle Scholar
  10. Fay FH, Kelly BP (1980) Mass natural mortality of walruses (Odobenus rosmarus) at St. Lawrence Island, Bering Sea, autumn 1978. Arctic 33:226–245Google Scholar
  11. Fay FH, Stoker SW (1982a) Analysis of reproductive organs and stomach contents from walruses taken in the Alaskan native harvest, spring 1980. Final Rep U S Fish Wildl Serv, Anchorage, Alaska, 86 ppGoogle Scholar
  12. Fay FH, Stoker SW (1982b) Reproductive success and feeding habits of walruses taken in the 1982 spring harvest, with comparisons from previous years. Final Rep Eskimo Walrus Commission, Nome, Alaska, 91 ppGoogle Scholar
  13. Freuchen P (1935) Mammals, 2. Field notes and personal observations. Rep Fifth Thule Exped 1921–24 2(4–5):68–278Google Scholar
  14. Gray RW (1927) The walrus. Nature (London) 119:923Google Scholar
  15. Krylov VI (1971) Food of the Pacific walrus (Odobenus rosmarus divergens Ill.). In: Milchenko ES, Andreeva TM, Burov GP (eds) Studies of marine mammals. Trudy Atlantic Sci Inst Fish and Oceanogr no 39. (Translated from Russian by Fish Mar Serv, Canada, Transl Ser no 3185)Google Scholar
  16. Lowry LF, Frost KJ, Burns JJ (1981) Trophic relationship among ice-inhabiting phocid seals and functionally related marine mammals in the Bering Sea. In: Environmental assessment of the Alaskan continental shelf, final reports of principal investigators, vol 11, biological studies. NOAA Office of Marine Pollution Assessment, Juneau, Alaska, pp 99–173Google Scholar
  17. Rausch RL (1970) Trichinosis in the Arctic. In: Gould SE (ed) Trichinosis in man and animals. Chas C Thomas, Springfield Ill, pp 348–373Google Scholar
  18. Scheffler VB (1955) Standard measurements of seals. J Mammal 48:459–462Google Scholar
  19. Smith TG (1980) Polar bear predation of ringed and bearded seals in the land-fast sea ice habitat. Can J Zool 58:2201–2209Google Scholar
  20. Stirling I, McEwan EH (1975) The caloric value of whole ringed seals (Phoca hispida) in relation to polar bear (Ursus maritimus) ecology and hunting behavior. Can J Zool 53:1021–1027Google Scholar
  21. Vibe C (1950) The marine mammals and the marine fauna in the Thule district (northwest Greenland) with observations on ice conditions in 1939–41. Medd Groenl 150:1–115Google Scholar

Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • L. F. Lowry
    • 1
  • F. H. Fay
    • 2
  1. 1.Alaska Department of Fish and GameFairbanksUSA
  2. 2.Institute of Marine ScienceUniversity of AlaskaFairbanksUSA

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