C. Saavedra-1997
Journal of Shellfish Research, 16 (2) : 441-446 (from Current Contents)
Abstract:
Data on allozyme frequencies were used to estimate the effective sizes (N-e) of three hatchery-obtained populations of Ostrea edulis from Spain and France in the first hatchery generation. Two methods of N-e estimation were used: the so-called ''temporal method,'' based on the changes of allele frequencies across generations, and the ''heterozygosity method,'' based on the decrease of hererozygosity with respect to the parental wild population from which the broodstock animals were obtained. For comparison, the effective size of the wild progenitor population of one of the Spanish hatchery populations (Ortigueira) was also estimated by the temporal method. Large differences between the number of individuals used as broodstock and N-e were observed. More important, the estimates indicate that the N-e of hatchery populations is smaller than that of the wild population studied. Introduction in the wild of such low-variability hatchery-produced oysters could result in the reduction of inbreeding and variance N-e of the wild populations.
(Univ. Crete, Dept. Biol. Rethimnon, Greece)