Integrative analyses of speciation and divergence in Psammodromus hispanicus (Squamata: Lacertidae).

Détails

Ressource 1Télécharger: BIB_BCFED86E2E08.P001.pdf (4591.82 [Ko])
Etat: Serval
Version: de l'auteur
ID Serval
serval:BIB_BCFED86E2E08
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Integrative analyses of speciation and divergence in Psammodromus hispanicus (Squamata: Lacertidae).
Périodique
BMC Evolutionary Biology
Auteur(s)
Fitze P.S., Gonzalez-Jimena V., San-Jose L.M., San Mauro D., Aragón P., Suarez T., Zardoya R.
ISSN
1471-2148 (Electronic)
ISSN-L
1471-2148
Statut éditorial
Publié
Date de publication
2011
Peer-reviewed
Oui
Volume
11
Pages
347
Langue
anglais
Résumé
BackgroundGenetic, phenotypic and ecological divergence within a lineage is the result of past and ongoing evolutionary processes, which lead ultimately to diversification and speciation. Integrative analyses allow linking diversification to geological, climatic, and ecological events, and thus disentangling the relative importance of different evolutionary drivers in generating and maintaining current species richness.ResultsHere, we use phylogenetic, phenotypic, geographic, and environmental data to investigate diversification in the Spanish sand racer (Psammodromus hispanicus). Phylogenetic, molecular clock dating, and phenotypic analyses show that P. hispanicus consists of three lineages. One lineage from Western Spain diverged 8.3 (2.9-14.7) Mya from the ancestor of Psammodromus hispanicus edwardsianus and P. hispanicus hispanicus Central lineage. The latter diverged 4.8 (1.5-8.7) Mya. Molecular clock dating, together with population genetic analyses, indicate that the three lineages experienced northward range expansions from southern Iberian refugia during Pleistocene glacial periods. Ecological niche modelling shows that suitable habitat of the Western lineage and P. h. edwardsianus overlap over vast areas, but that a barrier may hinder dispersal and genetic mixing of populations of both lineages. P. h. hispanicus Central lineage inhabits an ecological niche that overlaps marginally with the other two lineages.ConclusionsOur results provide evidence for divergence in allopatry and niche conservatism between the Western lineage and the ancestor of P. h. edwardsianus and P. h. hispanicus Central lineage, whereas they suggest that niche divergence is involved in the origin of the latter two lineages. Both processes were temporally separated and may be responsible for the here documented genetic and phenotypic diversity of P. hispanicus. The temporal pattern is in line with those proposed for other animal lineages. It suggests that geographic isolation and vicariance played an important role in the early diversification of the group, and that lineage diversification was further amplified through ecological divergence.
Pubmed
Web of science
Open Access
Oui
Création de la notice
02/03/2012 18:06
Dernière modification de la notice
09/05/2019 0:31
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