Phylogeographic analyses of the 30°s south-east Pacific biogeographic transition zone establish the occurrence of a sharp genetic discontinuity in the kelp Lessonia nigrescens: Vicariance or parapatry?

Tellier, F; Meynard A.P.; Valero, M; Correa J.A.; Faugeron, S

Keywords: lessonia, nigrescens

Abstract

Phylogeographic studies are lacking in the Southern Hemisphere, and in particular in the south-eastern Pacific. To infer the possible scenario for the debated biogeographic transition zone located at 30-33°S along the Chilean coast, we investigated whether there is a concordance between the phylogeographic pattern and the biogeographic transition in the intertidal kelp Lessonia nigrescens whose distribution is continuous across this transition zone. Using a combination of four makers located in the three genomic compartments (chloroplast, mitochondria and nucleus), we showed the presence of two main divergent lineages, possibly cryptic species. There was an exact match of the phylogeographic break with the 30°S biogeographic transition zone, suggesting a common origin. The combined information given by the multilocus approach and by the population analysis suggested the occurrence of a budding speciation, with a northward range expansion. © 2009 Elsevier Inc. All rights reserved.

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Título de la Revista: MOLECULAR PHYLOGENETICS AND EVOLUTION
Volumen: 53
Número: 3
Editorial: ACADEMIC PRESS INC ELSEVIER SCIENCE
Fecha de publicación: 2009
Página de inicio: 679
Página final: 693
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-73349103669&partnerID=q2rCbXpz