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Geographical speciation related to Pleistocene range shifts in the western Mediterranean mountains (Reseda sect. Glaucoreseda, Resedaceae)

Other TitlesPleistocene speciation in Reseda sect. Glaucoreseda
AuthorsMartín-Bravo, Santiago; Valcárcel, Virginia; Vargas, Pablo ; Luceño, Modesto
KeywordsLineage sorting
Mountain endemics
Pleistocene glaciations
Reseda section Glaucoreseda
Western Mediterranean
Issue DateApr-2010
PublisherBotanischer Garten und Botanisches Museum (Berlin, Germany)
CitationTAXON 59 (2): 466–482 (2010)
AbstractReseda sect. Glaucoreseda is a monophyletic group composed of five endemic tetraploid species with a disjunct distribution in the high mountains and plateaus of the Iberian Peninsula and Morocco. It was previously suggested that range shifts induced by Quaternary glaciations played an important role in the speciation of the group. We studied the evolution of R. sect. Glaucoreseda in order to infer historical range dynamics and speciation processes, and to understand current distributional patterns. Phylogeographic analyses were performed using nuclear ribosomal ITS and plastid trnL-F and rps16 sequences. Cloning of additive ITS sequences was carried out to elucidate the origin of intra-individual polymorphisms. A dated phylogeny based on ITS and cpDNA (rbcL, matK, trnL-F) sequences was used to estimate divergence times of R. sect. Glaucoreseda. Time estimates using Penalized Likelihood analyses indicate a late Pleistocene diversification of R. sect. Glaucoreseda. Incomplete lineage sorting of ancestral polymorphisms due to recent divergence, rather than rampant hybridisation, is suggested as the main cause of the phylogenetic incongruence detected between nuclear and plastid datasets. Our results support the vicariance hypothesis for population disjunctions in the Iberian Peninsula, in which an ancestral, widespread species could have undergone differentiation by Quaternary interglacial fragmentation. In contrast, long-distance dispersal across the Strait of Gibraltar may have been involved in the colonisation of North African plateaus by R. battandieri.
Description16 páginas, 2 tablas, 3 figuras
Publisher version (URL)http://www.ingentaconnect.com/content/iapt/tax/2010/00000059/00000002/art00012
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