[Heterozygosity and selective value: the case of the marine fish, Diplodus sargus (Linné, 1758)].
A total of 842 white sea bream (Diplodus sargus), sampled in Banyuls-sur-Mer, were analysed to test 'genotype-phenotype' relationship for various characters related to the fitness. The results show significant differences (MLH and FIS) for the age according to the sex between females carrying out and not carrying out sexual inversion. This suggests an overdominance for old females and a genetic sex determination. The individuals laying very early during the period of reproduction are also differentiated from the individuals reproducing later in the season. These results suggest either a stable calendar of laying in time separating the individuals genetically reproducing precociously from the others and this by differential selection and/or genetic drift either a Wahlund effect among cohorts.
Lenfant
Philippe
P
Laboratoire d'ichtyoécologie tropicale et méditerranéenne, Ecole pratique des hautes études, ESA 8046 CNRS, université de Perpignan, 66860 Perpignan, France. lenfant@univ-perp.fr
D000818:Animals; D005260:Female; D006579:Heterozygote; D008297:Male; D010641:Phenotype; D012098:Reproduction; D021541:Sea Bream / Q000235:genetics* / Q000502:physiology; D012621:Seasons; D012641:Selection, Genetic; D019849:Sex Determination Processes; D013997:Time Factors