Effective Size of Subpopulations in Early-Run Sockeye Salmon Oncorhynchus nerka from Azabach'e Lake (Kamchatka): The Effect of Density on Variance of Reproductive Success

Author： Efremov V. V.   Parensky V. A.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 1022-7954

Source： Russian Journal of Genetics, Vol.40, Iss.4, 2004-04, pp. : 431-436

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Abstract

Using Parensky's approach for estimating the number of breeding pairs, we determined effective subpopulation size Ne in early-run sockeye salmon Oncorhynchus nerka from Azabach'e Lake (Kamchatka) in 1977 through 1981. On average (over years and populations), biased sex ratio decreased Ne by 7% as compared to the number of fish on the spawning sites (Ni). High density reduced the Ne /Ni ratio by 62–66% because some fish were excluded from spawning. Dominance polygyny as compared to monogamy and random union of gametes could reduce Ne by about 17%.

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