[Effective size of subpopulation of the early run sockeye salmon Oncorhynchus nerka from Azabach's Lake (Kamchatka): effect of density on variance of reproductive success].
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%.
Efremov
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Institute of Marine Biology, Russian Academy of Sciences, Vladivostok, 690041 Russia. efremov@hotmail.com
Parenskiĭ
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VA
D000818:Animals; D005260:Female; D008297:Male; D010140:Pacific Ocean; D012098:Reproduction; D012474:Salmon / Q000145:classification / Q000254:growth & development* / Q000502:physiology; D012744:Sex Ratio