Where and when does a ring start and end? Testing the ring-species hypothesis in a species complex of Australian parrots

Joseph, Leo, Dolman, Gaynor, Donnellan, Stephen, Saint, Kathleen M., Berg, Mathew L. and Bennett, Andrew T. D. 2008, Where and when does a ring start and end? Testing the ring-species hypothesis in a species complex of Australian parrots, Proceedings of the Royal Society B-biological sciences, vol. 275, no. 1650, pp. 2431-2440.

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Title Where and when does a ring start and end? Testing the ring-species hypothesis in a species complex of Australian parrots
Author(s) Joseph, Leo
Dolman, Gaynor
Donnellan, Stephen
Saint, Kathleen M.
Berg, Mathew L.
Bennett, Andrew T. D.
Journal name Proceedings of the Royal Society B-biological sciences
Volume number 275
Issue number 1650
Start page 2431
End page 2440
Total pages 10
Publisher The Royal Society
Place of publication London, England
Publication date 2008-11-07
ISSN 0962-8452
1471-2954
Keyword(s) ring species
landscape genetics
phylogeography
speciation
Platycercus elegans
Crimson Rosella
Summary 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.
Language eng
Field of Research 059999 Environmental Sciences not elsewhere classified
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, The Royal Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30022779

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