Phylogeography and demographic history of Lacerta lepida in the Iberian Peninsula : multiple refugia, range expansions and secondary contact zones

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Miraldo , A , Hewitt , G M , Paulo , O S & Emerson , B C 2011 , ' Phylogeography and demographic history of Lacerta lepida in the Iberian Peninsula : multiple refugia, range expansions and secondary contact zones ' , BMC Evolutionary Biology , vol. 11 , no. 170 . https://doi.org/10.1186/1471-2148-11-170

Title: Phylogeography and demographic history of Lacerta lepida in the Iberian Peninsula : multiple refugia, range expansions and secondary contact zones
Author: Miraldo, Andreia; Hewitt, Godfrey M.; Paulo, Octavio S.; Emerson, Brent C.
Contributor: University of Helsinki, Biosciences
Date: 2011-06-17
Language: eng
Number of pages: 19
Belongs to series: BMC Evolutionary Biology
ISSN: 1471-2148
URI: http://hdl.handle.net/10138/28197
Abstract: The Iberian Peninsula is recognized as an important refugial area for species survival and diversification during the climatic cycles of the Quaternary. Recent phylogeographic studies have revealed Iberia as a complex of multiple refugia. However, most of these studies have focused either on species with narrow distributions within the region or species groups that, although widely distributed, generally have a genetic structure that relates to pre-Quaternary cladogenetic events. In this study we undertake a detailed phylogeographic analysis of the lizard species, Lacerta lepida, whose distribution encompasses the entire Iberian Peninsula. We attempt to identify refugial areas, recolonization routes, zones of secondary contact and date demographic events within this species. Results support the existence of 6 evolutionary lineages (phylogroups) with a strong association between genetic variation and geography, suggesting a history of allopatric divergence in different refugia. Diversification within phylogroups is concordant with the onset of the Pleistocene climatic oscillations. The southern regions of several phylogroups show a high incidence of ancestral alleles in contrast with high incidence of recently derived alleles in northern regions. All phylogroups show signs of recent demographic and spatial expansions. We have further identified several zones of secondary contact, with divergent mitochondrial haplotypes occurring in narrow zones of sympatry. The concordant patterns of spatial and demographic expansions detected within phylogroups, together with the high incidence of ancestral haplotypes in southern regions of several phylogroups, suggests a pattern of contraction of populations into southern refugia during adverse climatic conditions from which subsequent northern expansions occurred. This study supports the emergent pattern of multiple refugia within Iberia but adds to it by identifying a pattern of refugia coincident with the southern distribution limits of individual evolutionary lineages. These areas are important in terms of long-term species persistence and therefore important areas for conservation.
Subject: 1181 Ecology, evolutionary biology
Phylogeography
Iberian peninsula
demographic expansions
secondary contact zones
Lacerta lepida
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