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Genetic divergence among three sympatric species of Mediterranean Patella (Archaeogastropoda)

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Abstract

Patella caerulea L., P. aspera Lam. (=P. ulyssiponensis Gmelin). P. rustica L. (=P. lusitanica Gmelin) are coexisting Mediterranean species of the genus Patella. P. caerulea and P. rustica have a haploid complement of n=9 with seven metacentric and two telocentric chromosomes, while P. aspera has a haploid complement of n=8 without telocentric chromosomes. To better define the phylogenetic relationships among these three species, an electrophoretic analysis of 12 enzyme coding loci was performed on samples of the three species collected from Laigueglia (Liguria, Italy) in 1989. On the whole, genotypic frequencies were in agreement with Hardy-Weinberg expectations and no significant differences were observed among the populations of the three species as far as their genetic structure is concerned. Nearly 50% of the sampled loci were diagnostic. Nei's genetic distance was 0.82 between P. caerulea and P. aspera, 0.97 between P. aspera and P. rustica and 0.94 between P. caerulea and P. rustica. By greatly separating P. rustica from the other two species, results of the electrophoretic analysis are consistent with the traditional view, which regards P. aspera and P. caerulea as more closely related than P. rustica on the basis of radular teeth morphology. Using genetic distances and the assumptions of the molecular clock, lineages leading to P. aspera and to P. caerulea may have diverged from the stem common to P. rustica ca. 18 million years ago.

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Authors and Affiliations

  1. Department of Animal Biology, University of Turin, Via Accademia Albertina 17, I-10123, Torino, Italy

    G. Sella, C. A. Robotti & V. Biglione

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  1. G. Sella
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  2. C. A. Robotti
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  3. V. Biglione
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Communicated by M. Sarà, Genova

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Sella, G., Robotti, C.A. & Biglione, V. Genetic divergence among three sympatric species of Mediterranean Patella (Archaeogastropoda). Marine Biology 115, 401–405 (1993). https://doi.org/10.1007/BF00349838

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  • DOI: https://doi.org/10.1007/BF00349838

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