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Título
Evolutionary history of Podarcis tiliguerta on Corsica and Sardinia
Autor(es)
Materia
Podarcis tiliguerta
Lacertidae
Corsica and Sardinia Islands
Mitochondrial DNA
Nuclear DNA
Species tree
Clasificación UNESCO
2401 Biología Animal (Zoología)
Fecha de publicación
2017
Editor
12
Citación
Rodríguez, V., Buades, J. M., Brown, R. P., Terrasa, B., Pérez-Mellado, V., Corti, C., ... & Ramon, M. M. (2017). Evolutionary history of Podarcis tiliguerta on Corsica and Sardinia. BMC evolutionary biology, 17(1), 27.
Resumen
[EN] Background: Podarcis tiliguerta is a wall lizard endemic to the Mediterranean islands of Corsica and Sardinia.
Previous findings of high mtDNA and morphological diversity have led to the suggestion that it may represent a
species complex. Here, we analysed mitochondrial and nuclear markers (mtDNA, 3110 bp; 6 nDNA loci, 3961 bp) in
P. tiliguerta sampled from thirty-two localities across Corsica and Sardinia.
Results: We find much greater intraspecific genetic divergence than between sister species of other Mediterranean
island Podarcis, i.e., between P. lilfordi and P. pityusensis. We detected three mtDNA clusters in Corsica (North, South-East
and South-West) and either two or three in Sardinia (North vs. South) depending on the clustering method. Only one
or two nDNA groups were identified within each main island (again, depending on the method). A Bayesian timecalibrated
multispecies coalescent tree was obtained from mtDNA and provided statistical support for a Miocene origin
of the species (13.87 Ma, 95% HPD: 18.30–10.77 Ma). The posterior mean divergence time for the Corsican and
Sardinian lineages was 12.75 Ma ago (95% HPD: 16.94–9.04 Ma).
Conclusion: The results support the evolutionary distinctiveness of Corsican and Sardinian populations and also
indicate a lack of post-divergence migration despite periods of contact being possible. Further to this, species
delimitation analyses of Corsican and Sardinian lineages provided statistical support for their recognition as distinct
(sister) taxa. Our results provide new insights into the biogeography of the Mediterranean biodiversity hotspot, and
contribute important findings relevant to the systematics and evolution of this speciose lizard genus.
URI
DOI
10.1186/s12862-016-0860-4
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