Evaluating the Ryman–Laikre effect for marine stock enhancement and aquaculture

Details

• Journal Title:
  Current Zoology
• Personal Author:
  Waples, Robin S. ; Hindar, Kjetil ; Karlsson, Sten ; Hard, Jeffrey J.
• NOAA Program & Office:
  NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center)
• 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).
• Keywords:
  Fish Stock Assessment Inbreeding Populations Fish Stock Assessment
• Source:
  Curr Zool ; . 2016 Dec;62(6):617-627
• DOI:
  https://doi.org/10.1093/cz/zow060
• Pubmed Central ID:
  PMC5804264
• Document Type:
  Journal Article
• Rights Information:
  Public Domain
• Compliance:
  PMC
• Main Document Checksum:
  urn:sha-512:26068a1745e3ee1abcbdf8b1ab7128a5500b3d41f7e8135c3766153d2feb61155dc8ca26be90337f3dcd05bbb34d4cb5084e2dd8cb26ceaaf647a5d6d5d8f427
• Download URL:
  https://repository.library.noaa.gov/view/noaa/24265/noaa_24265_DS1.pdf
• File Type:
  [PDF - 517.45 KB ]