FCT (Portugal) and NRF (South Africa).
Historical demographic dynamics underlying local adaptation in the presence of gene flow
Article first published online: 27 SEP 2012
© 2012 The Authors. Ecology and Evolution published by Blackwell Publishing Ltd.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Ecology and Evolution
Volume 2, Issue 11, pages 2710–2721, November 2012
How to Cite
Ecology and Evolution 2012; 2(11): 2710–2721
- Issue published online: 8 NOV 2012
- Article first published online: 27 SEP 2012
- Manuscript Accepted: 3 SEP 2012
- Manuscript Revised: 28 AUG 2012
- Manuscript Received: 26 JUN 2012
- Approximate Bayesian Computation;
- historical demography;
- range limits
The range of a species is the result of the relative contribution of spatial tracking of environmental requirements and adaptation to ecological conditions outside the ancestral niche. The appearance of novel habitats caused by climatic oscillation can promote range expansion and accompanying demographic growth. The demographic dynamics of populations leave a signal in \ patterns. We modeled three competing scenarios pertaining to the circumstance of a range expansion by the Karoo Scrub-Robin into newly available habitat resulting from the increasing aridification of southern Africa. Genetic variation was contrasted with the theoretical expectations of a spatial range expansion, and compared with data of a putative adaptive trait. We infer that this bird likely colonized the arid zone, as a consequence of adaptive evolution in a small peripheral population, followed by an expansion with recurrent exchange of migrants with the ancestral populations.