Late Cenozoic diversification of the austral genus Lagenophora (Astereae, Asteraceae). (26th November 2014)

• Record Type: Journal Article
• Authors: Sancho, Gisela; de Lange, Peter J.; Donato, Mariano; Barkla, John; Wagstaff, Steve J.
• Is Part Of: Botanical journal of the Linnean Society. Volume 177:Number 1(2015:Jan.)
• Page Start: 78
• Page End: 95
• Publication Date: 2014-11-26
• Subjects: Botany -- Periodicals; 580
• DOI: 10.1111/boj.12224
• Languages: English
• ISSNs: 0024-4074

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p> <italic>Lagenophora</italic> (Astereae, Asteraceae) has 14 species in New Zealand, Australia, Asia, southern South America, Gough Island and Tristan da Cunha. Phylogenetic relationships in <italic>Lagenophora</italic> were inferred using nuclear and plastid DNA regions. Reconstruction of spatio‐temporal evolution was estimated using parsimony, Bayesian inference and likelihood methods, a Bayesian relaxed molecular clock and ancestral area and habitat reconstructions. Our results support a narrow taxonomic concept of <italic>Lagenophora</italic> including only a core group of species with one clade diversifying in New Zealand and another in South America. The split between the New Zealand and South American <italic>Lagenophora</italic> dates from 11.2 Mya [6.1–17.4 95% highest posterior density (HPD)]. The inferred ancestral habitats were openings in beech forest and subalpine tussockland. The biogeographical analyses infer a complex ancestral area for <italic>Lagenophora</italic> involving New Zealand and southern South America. Thus, the estimated divergence times and biogeographical reconstructions provide circumstantial evidence that Antarctica may have served as a corridor for migration until the expansion of the continental ice during the late Cenozoic. The extant distribution of <italic>Lagenophora</italic> reflects a complex history that could also have involved direct long‐distance dispersal across southern oceans. © 2014 The Linnean Society of London, <italic>Botanical Journal of the Linnean Society</italic>, 2015, <bold>177</bold>, 78–95.</p> </abstract>