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High gene flow promotes the genetic homogeneity of the fish goby Pomatoschistus marmoratus (Risso, 1810) from Mar Menor coastal lagoon and adjacent marine waters (Spain)
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Advisor(s)
Abstract(s)
The extreme environmental variability of coastal lagoons suggests that physical
and ecological factors could contribute to the genetic divergence among populations
occurring in lagoon and open-coast environments. In this study we
analysed the genetic variability of lagoon and marine samples of the sand goby,
Pomatoschistus marmoratus (Risso, 1810) (Pisces: Gobiidae), on the SW Spain
coast. A fragment of mitochondrial DNA control region (570 bp) was
sequenced for 196 individuals collected in five localities: Lo Pagan, Los Urrutias
and Playa Honda (Mar Menor coastal lagoon), and Veneziola and Mazarro´n
(Mediterranean Sea). The total haplotype diversity was h = 0.9424 ± 0.0229,
and the total nucleotide diversity was p = 0.0108 ± 0.0058. Among-sample
genetic differentiation was not significant and small-scale patterns in the distribution
of haplotypes were not apparent. Gene flow and dispersal-related life
history traits may account for low genetic structure at a small spatial scale. The
high genetic diversity found in P. marmoratus increases its potential to adapt
to changing conditions of the Mar Menor coastal lagoon.
Description
Keywords
Coastal lagoon Connectivity Gene flow Mar Menor Mediterranean Sea Mitochondrial DNA Pomatoschistus marmoratus
