The deep-sea habitat, from 200 to 2000 m depth, has long been thought as anecosystem where biotic and abiotic factors vary very little and consequentlyspecies are not disturbed by processes and phenomena which could promotefast evolutionary mechanisms. Unfortunately, biological information relating todeep water is limited, especially regarding the population genetics of speciesinhabiting the Mediterranean Sea, and general patterns cannot be inferred. Inthis study we report data on the population genetic structure of Aristeusantennatus, a deep-sea decapod crustacean species which has been widelystudied due to its important economic value. We surveyed and examined thevariation in a 369-bp fragment of the mtDNA control region from individualscaught by Spanish and Italian trawlers in eight localities. High levels of mitochondrialcontrol region haplotypic diversity (ranging from 0.884 to 0.989)were observed. AMOVA showed a high level of genetic variation, more withinthan between populations, and a low but significant FST value was recovered.Minimum spanning network did not separate any haplotype group and haplotypedistribution does not mirror the geographic origin of the samples. Theabsence of population substructuring was also observed with a principal coordinatesanalysis, which uses an individual-by-individual comparison. Theseresults revealed extensive gene flow among populations. Information on demographichistory based on mismatch analysis revealed an unstable population,showing an alternate pattern of growth and decline. Our results indicated thatin the western and central Mediterranean basins A. antennatus is a largepanmictic population with a fluctuating abundance. The absence of deep-seabarriers and adult migration may prevent the structuring of the species intogenetically differentiated populations.
|Numero di pagine||12|
|Stato di pubblicazione||Published - 2009|
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