Synergy between Allopatry and Ecology in Population Differentiation and Speciation

Autor: Yann Surget-Groba, Helena Johansson, Roger S. Thorpe
Jazyk: angličtina
Rok vydání: 2012
Předmět:
Zdroj: International Journal of Ecology, Vol 2012 (2012)
Druh dokumentu: article
ISSN: 1687-9708
1687-9716
DOI: 10.1155/2012/273413
Popis: The general diversity pattern of the Caribbean anole radiation has been described in detail; however, the actual mechanisms at the origin of their diversification remain controversial. In particular, the role of ecological speciation, and the relative importance of divergence in allopatry and in parapatry, is debated. We describe the genetic structure of anole populations across lineage contact zones and ecotones to investigate the effect of allopatric divergence, natural selection, and the combination of both factors on population differentiation. Allopatric divergence had no significant impact on differentiation across the lineage boundary, while a clear bimodality in genetic and morphological characters was observed across an ecotone within a single lineage. Critically, the strongest differentiation was observed when allopatry and ecology act together, leading to a sharp reduction in gene flow between two lineages inhabiting different habitats. We suggest that, for Caribbean anoles to reach full speciation, a synergistic combination of several historical and ecological factors may be requisite.
Databáze: Directory of Open Access Journals
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