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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Acknowledgments
Financial support was provided by the University of Rome ‘La Sapienza’, Progetti di Ateneo 2007–2009. We thank all people who helped in the collection of sand smelts: D Crosetti (Institute for Environmental Protection and Research), Territorial Executive Office for Biodiversity of Fogliano, L Tancioni (University of Rome “Tor Vergata”), A Santulli (University of Palermo), IAM Marino (University of Padova), A Fusari and M Rampacci (Agriculture and Fish Management). We wish to thank the two anonymous reviewers who helped to improve this manuscript.
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227_2011_1817_MOESM2_ESM.tif
Summary of sampling locations considered in the present and previous studies on lagoon and lake samples of A. boyeri. Circles and triangles indicate studies based on mitochondrial and nuclear markers, respectively. The color indicates the corresponding reference. See Table 1 in supplementary data for details on the type of the used molecular marker (TIFF 55814 kb)
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Milana, V., Franchini, P., Sola, L. et al. Genetic structure in lagoons: the effects of habitat discontinuity and low dispersal ability on populations of Atherina boyeri . Mar Biol 159, 399–411 (2012). https://doi.org/10.1007/s00227-011-1817-1
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DOI: https://doi.org/10.1007/s00227-011-1817-1