Title |
Genetic structure and bio-climatic modeling support allopatric over parapatric speciation along a latitudinal gradient
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Published in |
BMC Ecology and Evolution, August 2012
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DOI | 10.1186/1471-2148-12-149 |
Pubmed ID | |
Authors |
Maurizio Rossetto, Chris B Allen, Katie AG Thurlby, Peter H Weston, Melita L Milner |
Abstract |
Four of the five species of Telopea (Proteaceae) are distributed in a latitudinal replacement pattern on the south-eastern Australian mainland. In similar circumstances, a simple allopatric speciation model that identifies the origins of genetic isolation within temporal geographic separation is considered as the default model. However, secondary contact between differentiated lineages can result in similar distributional patterns to those arising from a process of parapatric speciation (where gene flow between lineages remains uninterrupted during differentiation). Our aim was to use the characteristic distributional patterns in Telopea to test whether it reflected the evolutionary models of allopatric or parapatric speciation. Using a combination of genetic evidence and environmental niche modelling, we focused on three main questions: do currently described geographic borders coincide with genetic and environmental boundaries; are there hybrid zones in areas of secondary contact between closely related species; did species distributions contract during the last glacial maximum resulting in distributional gaps even where overlap and hybridisation currently occur? |
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Demographic breakdown
Readers by professional status | Count | As % |
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Student > Ph. D. Student | 15 | 23% |
Student > Master | 6 | 9% |
Student > Bachelor | 4 | 6% |
Other | 3 | 5% |
Other | 13 | 20% |
Unknown | 4 | 6% |
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Unspecified | 1 | 2% |
Other | 2 | 3% |
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