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Evaluating the Ryman–Laikre effect for marine stock enhancement and aquaculture
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2016
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Source: Curr Zool
[PDF-517.45 KB]
Details:
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Journal Title:Current Zoology
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Description:The Ryman–Laikre (R-L) effect is an increase in inbreeding and a reduction in total effective population size (NeT) in a combined captive–wild system, which arises when a few captive parents produce large numbers of offspring. To facilitate evaluation of the R-L effect for scenarios that are relevant to marine stock enhancement and aquaculture, we extended the original R-L formula to explicitly account for several key factors that determine NeT, including the numbers of captive and wild adults, the ratio of captive to wild Ne/N (β), productivity of captive and wild breeders, and removal of individuals from the wild for captive breeding. We show how to provide quantitative answers to questions such as: What scenarios lead to no loss of effective size? What is the maximum effective size that can be achieved? and What scenarios insure that NeT will be no smaller than a specified value? Important results include the following: (1) For large marine populations, the value of β becomes increasingly important as the captive contribution increases. Captive propagation will sharply reduce NeT unless the captive contribution is very small or β is very large (∼103 or higher). (2) Very large values of β are only possible if wild Ne/N is tiny. Therefore, large wild populations undergoing captive enhancement at even modest levels will suffer major reductions in effective size unless wild Ne is a tiny fraction of the census size (about 10−4 or lower).
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Source:Curr Zool;. 2016 Dec;62(6):617-627;
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DOI:
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Pubmed Central ID:PMC5804264
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Rights Information:Public Domain
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Compliance:PMC
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