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Patterns of spatial genetic variation in Patella ulyssiponensis: insights from the western Mediterranean marine ecoregion

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Abstract

Patterns of genetic variation in marine species reflect the interplay of species-specific traits, oceanographic features, historical processes and selection. In the Atlantic–Mediterranean regions, Patella ulyssiponensis (Mollusca: Gastropoda) was previously used as a model to investigate these patterns. Our study gained insight into the genetic patterns of P. ulyssiponensis in the western Mediterranean marine ecoregion (WME), by means of ISSRs and COI. We evaluated the genetic structure of the WME with respect to the Atlantic and eastern Mediterranean, as well as the occurrence of further structuring within this ecoregion. Both population- and individual-based analysis evidenced that WME does not appear to be sharply isolated from the adjacent regions. Within the WME, P. ulyssiponensis displays a pattern of genetic structure that may reflect a chaotic patchiness scenario: structuring is neither related to coastal distance nor to other factors that may constrain dispersal. Compared to the congener P. ferruginea, P. ulyssiponensis shows weaker spatial genetic structure, which may reflect a higher dispersal potential coupled with greater population effective size. Whilst other processes that may have influenced the genetic pattern in the WME remain to be cleared, a recent range expansion coupled with species-specific traits favouring larval dispersal may have contributed to the genetic structuring.

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Acknowledgments

We are indebted with Rossana Sussarellu, Michele Barbieri, Benedetto Cristo, Georgina Rivera and Free Espinosa, for their help during the sampling campaigns. This study was part of the Ph.D. thesis of GLD which was partly funded by a grant of the Regione Autonoma della Sardegna—PO Sardegna FSE 2007-2013—L.R. 7/2007 “Promozione della ricerca scientifica e dell’innovazione tecnologica in Sardegna”.

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  1. Dipartimento di Scienze della Natura e del Territorio - Sezione di Zoologia, Archeozoologia e Genetica, Università di Sassari, Via Muroni 25, 07100, Sassari, Italy

    Piero Cossu, Gian Luca Dedola, Fabio Scarpa, Daria Sanna, Tiziana Lai, Marco Curini-Galletti & Marco Casu

  2. Unità di Biologia Marina, Dipartimento di Biologia, Università di Pisa, Via Derna 1, 56126, Pisa, Italy

    Ferruccio Maltagliati

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  1. Piero Cossu
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  2. Gian Luca Dedola
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  3. Fabio Scarpa
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  4. Daria Sanna
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  6. Ferruccio Maltagliati
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Correspondence to Marco Casu.

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Cossu, P., Dedola, G.L., Scarpa, F. et al. Patterns of spatial genetic variation in Patella ulyssiponensis: insights from the western Mediterranean marine ecoregion. Hydrobiologia 755, 39–55 (2015). https://doi.org/10.1007/s10750-015-2216-2

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