Chikhi Lounès, Bonhomme F., Agnèse Jean-François. (1998). Low genetic variability in a widely distributed and abundant clupeid species, Sardinella aurita : new empirical results and interpretations. Journal of Fish Biology, 52, p. 861-878. ISSN 0022-1112.
Titre du document
Low genetic variability in a widely distributed and abundant clupeid species, Sardinella aurita : new empirical results and interpretations
Année de publication
1998
Type de document
Article
Auteurs
Chikhi Lounès, Bonhomme F., Agnèse Jean-François
Source
Journal of Fish Biology, 1998,
52, p. 861-878 ISSN 0022-1112
Considering the wide geographic distribution and the catches of Sardinella aurita, the observed allozyme diversity (H = 0.011) is strikingly small. Potential explanations for this low gene diversity, which include restrictions on effective population size owing to variance in reproductive success, demographic instability, historical bottlenecks in population size, selection, and technical artifacts are examined and quantified. This quantification, though rough, shows that no single factor can account for the lack of diversity. However, demographic instability of S. aurita, especially if this instability has persisted over evolutionary time scales, together with much greater than Poisson variance in individual reproductive success, could account reasonably for the results. Pleistocene reduction of population size seems also a necessary co-factor. Technical artifacts, mostly scoring difficulties linked to liver autolysis, are considered also and analysed in different clupeid species. (Résumé d'auteur)
Plan de classement
Poissons [034BIOVER01]
Descripteurs
POISSON MARIN ; SARDINELLE ; GENETIQUE DE POPULATION ; DYNAMIQUE DE POPULATION ; POLYMORPHISME ENZYMATIQUE ; ELECTROPHORESE ; STRUCTURE DU PEUPLEMENT ; HETEROZYGOTE
