Mortality of puppies of northern fur seal (Callorhinus ursinus) on Tyuleniy Island (Okhotsk Sea)
https://doi.org/10.26428/1606-9919-2023-203-86-92
Abstract
Mortality rate of fur seal puppies is considered for the first two months of their postnatal ontogenesis, from the birth to leaving the rookery on Tyuleniy Island for wintering in the open waters of the Pacific. On average, 7.9 % of puppies die on the island, that is lower than the mortality on the rookeries on Commander Islands (14.4 %) and on Pribylov Islands (9.8 %). The higher mortality of puppies on Commander Islands is reasoned by their disease with uncinariosis at the northwestern rookery. In general, deaths of puppies have similar causes in different places of their birth: mainly exhaustion, injuries, and diseases.
Supporting agencies: The author is thankful to A.M. Trukhin, who took part in collection of primary information on the fur seal puppies mortality, as well as to reviewers of the manuscript for their valuable comments that were taken into account when preparing this article for publication.
About the Author
A. E. Kuzin
Pacific branch of VNIRO (TINRO)
Russian Federation
Russian Federation
Aleksey E. Kuzin, Ph. D., leading researcher
4, Shevchenko Alley, Vladivostok, 690091
References
1. Vladimirov, V.A., The current state of populations of northern fur seals in the USSR and the problems of their rational use, in Nauchno-issledovatel’skiye raboty po morskim mlekopitayushchim severnoy chasti Tikhogo okeana v 1989–1990 gg. Proyekt 02.05-61. “Morskiye mlekopitayushchiye”. Soglasheniye mezhdu SSSR i SSHA v oblasti okhrany okruzhayushchey sredy (Research work on marine mammals of the northern part of the Pacific Ocean in 1989–1990. Project 02.05-61. “Marine Mammals”. Agreement between the USSR and the USA in the field of environmental protection), Moscow: VNIRO, 1991, pp. 130–164.
2. Goodman, D., Demographic approach to tightly controlled populations, in Conservation Biology: An Evolutionary-Ecological Perspective, Soule, M.E. and Wilcox, B.A., ed., Sunderland, Massachusetts, Sinauer Associates, 1980.
3. Kogai, V.M., The present conditions and dynamics of fur seal populftion on Robben Island, Tr. Vseross. Nauchnj-Issled. Inst. Rybn. Khoz. Okeanogr., vol. 68: Izv. Tikhookean. Nauchno-Issled. Inst. Rybn. Khoz. Okeanogr., vol. 62: Pinnipeds of the North Pacific, 1968, pp. 43–52.
4. Kolevatova, A.I., Bukina, L.A., and Vasenin, Yu.A., Deseases and parasites of the northern fur seals, in The northern fur seal: Sistematics, morphology, ecology, behavior, M., 1998, pt 2, pp. 862–892.
5. Kuzin, A.E., The variability of the phenetic structure of the population and fur seals about Tyuleny, in Tezisy dokl. Vsesoyuz. Soveshch. “Evolyutsionnyye geneticheskiye issledovaniya mlekopitayushchikh” (Proc. Rep. All-Union Meet. “Evolutionary genetic studies of mammals”), Vladivostok: Dal’nevos. Nauchn. Tsentr Akad. Nauk SSSR, 1990, pp. 93–95.
6. Kuzin, A.E., Evaluation of mortality of the fur seals (Callorhinus ursinus) resulting from the ocean pollution with the waste of industrial fishery, Ecology, 1990, no. 5, pp. 89–92.
7. Kuzin, A.E., Sexual maturity and reproductive ability of populations of the northern fur seal, in 2-y Mezhdunarodnyy teriologicheskiy congress (2nd International Theriology Congress), Brno, 1978, p. 400.
8. Kuzin, A.E., Severnyy morskoy kotik (Northern Fur Seal). The second edition, complemented, Vladivostok: TINRO-Tsentr, 2014.
9. Timofeeva, A.A. and Kolesnik, Y.A., Infectious etiology of death of fur seals and ecologically connected animals, Izv. Tikhookean. Nauchno-Issled. Inst. Rybn. Khoz. Okeanogr., 2003, vol. 133, pp. 245–255.
10. Fauler, Ch.U., Northern fur seals on Pribilov Islands, in The northern fur seal: Sistematics, morphology, ecology, behavior, Moscow: IPEE RAN, 1998, pt 2, pp. 450–498.
11. Frisman, E.Ya., Skaletskaya, E.I., and Kuzin, A.E., Matematicheskoye modelirovaniye dinamiki chislennosti severnogo morskogo kotika i optimal’noye upravleniye kotikovym khozyaystvom (Mathematical modeling of the population dynamics of the northern fur seal and optimal management of the fur seal economy), Vladivostok: Dal’nevos. Nauchn. Tsentr Akad. Nauk SSSR, 1985.
12. Chapman, D.G., A critical study of Pribilof fur seal population estimates, Fish. Bull., 1964, vol. 63, no. 3, pp. 657–669.
13. Eberhardt, L.L., Population dynamics of the Pribilof fur seals, Dynamics of large mammal populations, N.Y.: J. Wiley and Sons, 1981, pp. 197–220.
14. Fowler, C.W., Density dependence in northern fur seals (Callorhinus ursinus), Marine Mammals Science, 1990, vol. 6, no. 3, pp. 171–195.
15. Fowler, C.W., Interactions of northern fur seals and commercial fisheries, Transactions of the 47th North American Wildlife and Natural Resources Confer., Wash., D.C., 1982, pp. 278–292.
16. Lander, R.H., Method of determining natural mortality in the northern fur seal (Callorhinus ursinus) from known pups and kill by age and sex, J. Fish Res. Board Can., 1975, vol. 32, no. 12, pp. 2447–2452. doi 10.1139/F75-282.
17. Lander, R.H., Role of land and ocean mortality in yield of male Alaskan fur seal, Callorhinus ursinus, Fish. Bull., 1979, vol. 77, no. 1, pp. 311–314.
18. Spraker, T.R. and Lander, M.E., Causes of mortality in northern fur seals (Callorhinus ursinus), St. Paul Island, Pribilof Islands, Alaska, 1986–2006, J. Wildl. Dis., 2010, vol. 46, pp. 450–473. doi 10.7589/0090-3558-46.2.450.
19. Trites, A.W., Estimating the juvenile survival rate of male northern fur seals (Callorhinus ursinus), Can. J. Fish. Aquat. Sci., 1989, vol. 46, pp. 1428–1436.
20. Trites, A.W., Northern fur seals: Why have they declined?, Aquatic Mammals, 1992, vol. 18, no. 1, pp. 3–18.
21. York, A.E. and Hartley, J.R., Pup production following harvest of female northern fur seals, Can. J. Fish. Aquat. Sci., 1981, vol. 38, no. 1, pp. 84–90. doi 10.1139/f81-011.
Review
For citations:
Kuzin A.E. Mortality of puppies of northern fur seal (Callorhinus ursinus) on Tyuleniy Island (Okhotsk Sea). Izvestiya TINRO. 2023;203(1):86-92. (In Russ.) https://doi.org/10.26428/1606-9919-2023-203-86-92
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