Using Parensky's approach for estimating the number of breeding pairs, we determined effective subpopulation size N e 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 N e by 7% as compared to the number of fish on the spawning sites (N i). High density reduced the N e /N i ratio by 62–66% because some fish were excluded from spawning. Dominance polygyny as compared to monogamy and random union of gametes could reduce N e by about 17%.
Russian Journal of Genetics – Springer Journals
Published: Oct 18, 2004
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