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Dryad

Microsatellite genotypes of Pomatoschistus microps and Pomatoschistus marmoratus of southern France lagoons

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Jul 16, 2020 version files 40.13 KB

Abstract

Pomatoschistus marmoratus and Pomatoschistus microps are small sedentary gobies inhabiting the lagoons of European Mediterranean and Atlantic coasts. Along the French Mediterranean coast their respective geographical distribution is not precisely known, in part because they are cryptic species. In this study, 512 gobies of both species were caught as 17 samples in 12 lagoons of the Golfe du Lion on the French Mediterranean coast. They were genotyped at six microsatellite loci and investigated statistically using multidimensional analyses, Bayesian assignment (Structure) and Newhybrids classification. This allowed us to describe the contrasted distribution of each species (P. microps in the east, P. marmoratus in the west), with several exceptions. Neither geographic structure nor isolation by distance was detected among differentiated populations of each species. The suggested mechanism is a deep sedentary behaviour associated with foundations following extinctions. The two species are sympatric or even in syntopy in 5 or 6 sampled lagoons producing rare fertile hybrids.