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Atherina boyeri Risso, 1810 is a euryhaline species of ecological and  economic relevance, highly diffused in most Mediterranean coastal  lagoons and characterized by high morphological variability among  populations. To study the genetic relationships among A. boyeri  populations, 11 Italian lagoons and 2 freshwater lakes were sampled and  a random amplified polymorphic DNA analysis was performed. Six  arbitrarily designed primers were used. Of the 43 scored markers, 39  were polymorphic. No population-specific markers were found. Statistical  analysis based on inferred allele frequencies (using Wright's F(st)  statistic) and on presence or absence of bands (using analysis of  molecular variance) revealed significant population structure.  Unweighted pair group method with arithmetic mean cluster analysis based  on Nei's genetic distances showed a geographic clustering of  populations. Mantel tests confirmed a high correlation between genetic  and geographic distances along coasts. These results suggest the  occurrence of coastal gene flows among populations, probably because the  anadromic behavior of this species may be only partially phylopatric.  However, these migratory movements have not blurred the existing  differences among populations

Population analysis of the sand smelt Atherina boyeri (Teleostei Atherinidae), from Italian coastal lagoons by random amplified polymorphic DNA