Genetic structure in lagoons: the effects of habitat discontinuity and low dispersal ability on populations of <Emphasis Type="Italic">Atherina boyeri</Emphasis> |
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Authors: | Valentina Milana Paolo Franchini Luciana Sola Elisa Angiulli Anna Rita Rossi |
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Institution: | 1.Department of Biology and Biotechnology,Sapienza University of Rome,Rome,Italy;2.Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology,University of Konstanz,Constance,Germany |
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Abstract: | Atherina boyeri is a common inhabitant of the Mediterranean brackish and coastal waters. Several recent studies proposed the recognition
of three distinct forms/species (one lagoon/freshwater and two marine) within an A. boyeri complex. In this study, we used 10 newly available microsatellite loci to better define the genetic structure of the lagoon
form. A total of 428 fishes from 11 lagoons along the Italian and Albanian coasts and three Italian lakes were analyzed. A
pronounced genetic spatial structure was confirmed for all considered geographic scales (near, medium and broad). A restricted
gene flow was detected, suggesting reduced population connectivity. The comparison of present data and previous studies, based
on mtDNA and RAPD markers, allowed a preliminary identification of the roles of recent factors (gene flow, habitat discontinuity
and water currents) and past events (e.g., Pleistocene glaciations) in shaping the pattern of genetic differentiation. |
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