Radiation and Repeated Transoceanic Dispersal of Schoeneae (Cyperaceae) Through the Southern Hemisphere

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dc.contributor.authorViljoen, Jan-Adriaan
dc.contributor.authorMuasya, A Muthama
dc.contributor.authorBarrett, Russell
dc.contributor.authorBruhl, Jeremy
dc.contributor.authorGibbs, Adele
dc.contributor.authorSlingsby, Jasper
dc.contributor.authorWilson, Karen
dc.contributor.authorVerboom, Anthony
dc.date.accessioned2016-08-12T11:52:50Z
dc.date.available2016-08-12T11:52:50Z
dc.date.issued2013
dc.date.updated2016-08-12T10:50:30Z
dc.description.abstract• Premise of the study: The broad austral distribution of Schoeneae is almost certainly a product of long-distance dispersal. Owing to the inadequacies of existing phylogenetic data and a lack of rigorous biogeographic analysis, relationships within the tribe remain poorly resolved and its pattern of radiation and dispersal uncertain. We employed an expanded sampling of taxa and markers and a rigorous analytic approach to address these limitations. We evaluated the roles of geography and ecology in stimulating the initial radiation of the group and its subsequent dispersal across the southern hemisphere. • Methods: A dated tree was reconstructed using reversible-jump Markov chain Monte Carlo (MCMC) with a polytomy prior and molecular dating, applied to data from two nuclear and three cpDNA regions. Ancestral areas and habitats were inferred using dispersal–extinction–cladogenesis models. • Key results: Schoeneae originated in Australia in the Paleocene. The existence of a “hard” polytomy at the base of the clade reflects the rapid divergence of six principal lineages ca. 50 Ma, within Australia. From this ancestral area, Schoeneae have traversed the austral oceans with remarkable frequency, a total of 29 distinct dispersal events being reported here. Dispersal rates between landmasses are not explicable in terms of the geographical distances separating them. Transoceanic dispersal generally involved habitat stasis. • Conclusions: Although the role of dispersal in explaining global distribution patterns is now widely accepted, the apparent ease with which such dispersal may occur has perhaps been under-appreciated. In Schoeneae, transoceanic dispersal has been remarkably frequent, with ecological opportunity, rather than geography, being most important in dictating dispersal patterns.en_ZA
dc.identifierhttp://dx.doi.org/10.3732/ajb.1300105
dc.identifier.apacitationViljoen, J., Muasya, A. M., Barrett, R., Bruhl, J., Gibbs, A., Slingsby, J., ... Verboom, A. (2013). Radiation and Repeated Transoceanic Dispersal of Schoeneae (Cyperaceae) Through the Southern Hemisphere. <i>American journal of botany</i>, http://hdl.handle.net/11427/21215en_ZA
dc.identifier.chicagocitationViljoen, Jan-Adriaan, A Muthama Muasya, Russell Barrett, Jeremy Bruhl, Adele Gibbs, Jasper Slingsby, Karen Wilson, and Anthony Verboom "Radiation and Repeated Transoceanic Dispersal of Schoeneae (Cyperaceae) Through the Southern Hemisphere." <i>American journal of botany</i> (2013) http://hdl.handle.net/11427/21215en_ZA
dc.identifier.citationViljoen, J. A., Muasya, A. M., Barrett, R. L., Bruhl, J. J., Gibbs, A. K., Slingsby, J. A., ... & Verboom, G. A. (2013). Radiation and repeated transoceanic dispersal of Schoeneae (Cyperaceae) through the southern hemisphere. American journal of botany, 100(12), 2494-2508.en_ZA
dc.identifier.issn0002-9122en_ZA
dc.identifier.ris TY - Journal Article AU - Viljoen, Jan-Adriaan AU - Muasya, A Muthama AU - Barrett, Russell AU - Bruhl, Jeremy AU - Gibbs, Adele AU - Slingsby, Jasper AU - Wilson, Karen AU - Verboom, Anthony AB - • Premise of the study: The broad austral distribution of Schoeneae is almost certainly a product of long-distance dispersal. Owing to the inadequacies of existing phylogenetic data and a lack of rigorous biogeographic analysis, relationships within the tribe remain poorly resolved and its pattern of radiation and dispersal uncertain. We employed an expanded sampling of taxa and markers and a rigorous analytic approach to address these limitations. We evaluated the roles of geography and ecology in stimulating the initial radiation of the group and its subsequent dispersal across the southern hemisphere. • Methods: A dated tree was reconstructed using reversible-jump Markov chain Monte Carlo (MCMC) with a polytomy prior and molecular dating, applied to data from two nuclear and three cpDNA regions. Ancestral areas and habitats were inferred using dispersal–extinction–cladogenesis models. • Key results: Schoeneae originated in Australia in the Paleocene. The existence of a “hard” polytomy at the base of the clade reflects the rapid divergence of six principal lineages ca. 50 Ma, within Australia. From this ancestral area, Schoeneae have traversed the austral oceans with remarkable frequency, a total of 29 distinct dispersal events being reported here. Dispersal rates between landmasses are not explicable in terms of the geographical distances separating them. Transoceanic dispersal generally involved habitat stasis. • Conclusions: Although the role of dispersal in explaining global distribution patterns is now widely accepted, the apparent ease with which such dispersal may occur has perhaps been under-appreciated. In Schoeneae, transoceanic dispersal has been remarkably frequent, with ecological opportunity, rather than geography, being most important in dictating dispersal patterns. DA - 2013 DB - OpenUCT DP - University of Cape Town J1 - American journal of botany LK - https://open.uct.ac.za PB - University of Cape Town PY - 2013 SM - 0002-9122 T1 - Radiation and Repeated Transoceanic Dispersal of Schoeneae (Cyperaceae) Through the Southern Hemisphere TI - Radiation and Repeated Transoceanic Dispersal of Schoeneae (Cyperaceae) Through the Southern Hemisphere UR - http://hdl.handle.net/11427/21215 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21215
dc.identifier.vancouvercitationViljoen J, Muasya AM, Barrett R, Bruhl J, Gibbs A, Slingsby J, et al. Radiation and Repeated Transoceanic Dispersal of Schoeneae (Cyperaceae) Through the Southern Hemisphere. American journal of botany. 2013; http://hdl.handle.net/11427/21215.en_ZA
dc.languageengen_ZA
dc.publisherBotanical Society of Americaen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourceAmerican journal of botanyen_ZA
dc.source.urihttp://www.amjbot.org/
dc.titleRadiation and Repeated Transoceanic Dispersal of Schoeneae (Cyperaceae) Through the Southern Hemisphereen_ZA
dc.typeJournal Articleen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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