Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/54060
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Type: Journal article
Title: Where and when does a ring start and end? Testing the ring-species hypothesis in a species complex of Australian parrots
Author: Joseph, L.
Dolman, G.
Donnellan, S.
Saint, K.
Berg, M.
Bennett, A.
Citation: Proceedings of the Royal Society of London Series B-Biological Sciences, 2008; 275(1650):2431-2440
Publisher: Royal Soc London
Issue Date: 2008
ISSN: 0962-8452
1471-2970
Statement of
Responsibility: 
Leo Joseph, Gaynor Dolman, Stephen Donnellan, Kathleen M Saint, Mathew L Berg and Andrew T.D Bennett
Abstract: Speciation, despite ongoing gene flow can be studied directly in nature in ring species that comprise two reproductively isolated populations connected by a chain or ring of intergrading populations. We applied three tiers of spatio-temporal analysis (phylogeny/historical biogeography, phylogeography and landscape/population genetics) to the data from mitochondrial and nuclear genomes of eastern Australian parrots of the Crimson Rosella Platycercus elegans complex to understand the history and present genetic structure of the ring they have long been considered to form. A ring speciation hypothesis does not explain the patterns we have observed in our data (e.g. multiple genetic discontinuities, discordance in genotypic and phenotypic assignments where terminal differentiates meet). However, we cannot reject that a continuous circular distribution has been involved in the group's history or indeed that one was formed through secondary contact at the ‘ring's’ east and west; however, we reject a simple ring-species hypothesis as traditionally applied, with secondary contact only at its east. We discuss alternative models involving historical allopatry of populations. We suggest that population expansion shown by population genetics parameters in one of these isolates was accompanied by geographical range expansion, secondary contact and hybridization on the eastern and western sides of the ring. Pleistocene landscape and sea-level and habitat changes then established the birds' current distributions and range disjunctions. Populations now show idiosyncratic patterns of selection and drift. We suggest that selection and drift now drive evolution in different populations within what has been considered the ring.
Keywords: ring species; Crimson Rosella; Platycercus elegans; speciation; phylogeography; landscape genetics
RMID: 0020082753
DOI: 10.1098/rspb.2008.0765
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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