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dc.contributor.authorStrijk, Joeri S
dc.contributor.authorNoyes, Richard D
dc.contributor.authorStrasberg, Dominique
dc.contributor.authorCruaud, Corinne
dc.contributor.authorGavory, Frederic
dc.contributor.authorChase, Mark W
dc.contributor.authorAbbott, Richard John
dc.contributor.authorThebaud, Christophe
dc.identifier.citationStrijk , J S , Noyes , R D , Strasberg , D , Cruaud , C , Gavory , F , Chase , M W , Abbott , R J & Thebaud , C 2012 , ' In and out of Madagascar : dispersal to peripheral islands, insular speciation and diversification of Indian Ocean daisy trees (Psiadia, Asteraceae) ' PLoS One , vol. 7 , no. 8 , e42932 . DOI: 10.1371/journal.pone.0042932en
dc.identifier.otherPURE: 24160552
dc.identifier.otherPURE UUID: df07358d-8c9e-42e6-bd54-b9a18d4f53ea
dc.identifier.otherScopus: 84865020568
dc.descriptionThis study was supported by the European Union’s HOTSPOTS Training Network (MEST-2005-020561)en
dc.description.abstractMadagascar is surrounded by archipelagos varying widely in origin, age and structure. Although small and geologically young, these archipelagos have accumulated disproportionate numbers of unique lineages in comparison to Madagascar, highlighting the role of waif-dispersal and rapid in situ diversification processes in generating endemic biodiversity. We reconstruct the evolutionary and biogeographical history of the genus Psiadia (Asteraceae), a plant genus with near equal numbers of species in Madagascar and surrounding islands. Analyzing patterns and processes of diversification, we explain species accumulation on peripheral islands and aim to offer new insights on the origin and potential causes for diversification in the Madagascar and Indian Ocean Islands biodiversity hotspot. Our results provide support for an African origin of the group, with strong support for non-monophyly. Colonization of the Mascarenes took place by two evolutionary distinct lineages from Madagascar, via two independent dispersal events, each unique for their spatial and temporal properties. Significant shifts in diversification rate followed regional expansion, resulting in co-occurring and phenotypically convergent species on high-elevation volcanic slopes. Like other endemic island lineages, Psiadia have been highly successful in dispersing to and radiating on isolated oceanic islands, typified by high habitat diversity and dynamic ecosystems fuelled by continued geological activity. Results stress the important biogeographical role for Rodrigues in serving as an outlying stepping stone from which regional colonization took place. We discuss how isolated volcanic islands contribute to regional diversity by generating substantial numbers of endemic species on short temporal scales. Factors pertaining to the mode and tempo of archipelago formation and its geographical isolation strongly govern evolutionary pathways available for species diversification, and the potential for successful diversification of dispersed lineages, therefore, appears highly dependent on the timing of arrival, as habitat and resource properties change dramatically over the course of oceanic island evolution.en
dc.relation.ispartofPLoS Oneen
dc.rights(c) 2012 Strijk et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.en
dc.subjectAncestral area reconstructionen
dc.subjectBiodiversity hotspotsen
dc.subjectHistorical biogeographyen
dc.subjectEvolutionary diversificationen
dc.subjectIndian Oceanen
dc.subjectLong distance dispersalen
dc.subjectMolecular datingen
dc.subjectQH301 Biologyen
dc.titleIn and out of Madagascar : dispersal to peripheral islands, insular speciation and diversification of Indian Ocean daisy trees (Psiadia, Asteraceae)en
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. St Andrews Sustainability Instituteen
dc.description.statusPeer revieweden

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