Genetic variation at eight microsatellite loci was studied in nine populations ofthe blue and red shrimp Aristeus antennatus to investigate whether distinctstocks are present in the Western Mediterranean Sea. A high level of gene flowand no evidence of genetic partitioning were discovered. No significant variationwas found (FST = 0.00673, P-value = 0.067) even when shrimps fromexploited and those from deep-water unexploited grounds were compared. Noevidence of reduction or expansion of population size in the recent past wasfound, as indicated by the bottleneck and interlocus g-tests. Our results areconsistent with previous studies using mitochondrial gene methods and allozymes,indicating that, for this species, extensive pelagic larval dispersal andadult migration are probably responsible for the genetic homogeneity observed.In particular, due to a different bathymetric distribution of males and females,reported to be associated with different water masses and hence with possibledifferential dispersal capacity between sexes, the hypothesis of sex-biased dispersalwas tested. Mean values of corrected assignment indices and mean relatednessvalues were higher for males, suggesting that females are the morewidely dispersing sex. Molecular assessment of A. antennatus from the WesternMediterranean provides data of biological and evolutionary interest for thesuccessful management of such a highly valuable fishery resource.
|Numero di pagine||14|
|Stato di pubblicazione||Published - 2012|
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