Abstract：
:The majority of the approximately 80-90 species in subtribe Arctotidinae occur in southern Africa with the centre of diversity in the winter-rainfall region. Three species are restricted to afromontane eastern Africa and three species are endemic to Australia. To investigate biogeographic and phylogenetic relationships within Arctotidinae, sequence data from four cpDNA regions (psbA-trnH, trnT-trnL and trnL-trnF spacers and trnL intron) and the ITS nrDNA region for 59 Arctotidinae species were analyzed with parsimony and Bayesian-inference approaches. Eight well-supported major lineages were resolved. The earliest-diverging extant lineages are afromontane or inhabit mesic habitats, whereas almost all sampled taxa from the winter-rainfall and semi-arid areas have diverged more recently. Molecular dating estimated that the major clades diverged during the Miocene and Pliocene, which is coincident with the trend of increasing rainfall seasonality, aridification and vegetation changes in southwestern Africa. Trans-oceanic dispersal to Australia was estimated to have occurred during the Pliocene.
journal_name
Mol Phylogenet Evoljournal_title
Molecular phylogenetics and evolutionauthors
McKenzie RJ,Barker NPdoi
10.1016/j.ympev.2008.07.007subject
Has Abstractpub_date
2008-10-01 00:00:00pages
1-16issue
1eissn
1055-7903issn
1095-9513pii
S1055-7903(08)00361-8journal_volume
49pub_type
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