Abstract:
:DNA sequencing (cytochrome oxidase I; 82 sequences; 25 locations) of a species complex of Australian six-rayed sea-stars (genus Patiriella) reveals four well-supported mtDNA clades, corresponding to P. oriens, P. occidens, P. medius, and P. gunnii. These clades have non-random geographic distributions along an east to west axis that are broadly consistent with the biogeographic provinces of southern Australia proposed by. The taxa are deeply divergent (minimum 7.5%) and are estimated to have originated during the late Pliocene. By contrast, intra-clade divergences are small, typically less than 1.0%. Phylogenetic analysis of mtDNA provides strong support for the combined monophyly of multicoloured forms (P. oriens, P. occidens, and P. medius; 100% bootstrap support) and suggests that P. medius (central) and P. occidens (western) may be sister taxa (up to 76% bootstrap support). Maximum likelihood analysis of nuclear DNA sequences (actin; 1437 bp) yields an optimal tree largely consistent with mtDNA groupings, but with little bootstrap support. The biogeographic distribution of P. oriens (eastern) and P. occidens (western) is roughly consistent with a vicariant model involving allopatric divergence during glaciation. In addition, we propose that the Great Australian Bight may also have retained isolated populations during glacial periods, perhaps explaining the "central" distributions of P. gunnii and P. medius.
journal_name
Mol Phylogenet Evoljournal_title
Molecular phylogenetics and evolutionauthors
Waters JM,O'Loughlin PM,Roy MSdoi
10.1016/j.ympev.2003.11.014keywords:
subject
Has Abstractpub_date
2004-07-01 00:00:00pages
236-45issue
1eissn
1055-7903issn
1095-9513pii
S1055790303004391journal_volume
32pub_type
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