Current address: Origine, Structure et Evolution de la Biodiversité (OSEB), UMR CNRs 5202, Département Systématique & Evolution, Museum National d’Histoire Naturelle, 16 Rue Buffon, F-75005 Paris, France.
Genetic consequences of Pleistocene range shifts: contrast between the Arctic, the Alps and the East African mountains
Article first published online: 1 MAY 2007
Volume 16, Issue 12, pages 2542–2559, June 2007
How to Cite
EHRICH, D., GAUDEUL, M., ASSEFA, A., KOCH, M. A., MUMMENHOFF, K., NEMOMISSA, S., CONSORTIUM, I. and BROCHMANN, C. (2007), Genetic consequences of Pleistocene range shifts: contrast between the Arctic, the Alps and the East African mountains. Molecular Ecology, 16: 2542–2559. doi: 10.1111/j.1365-294X.2007.03299.x
- Issue published online: 15 MAY 2007
- Article first published online: 1 MAY 2007
- Received 12 October 2006; revision accepted 16 January 2007
- Arabis alpina;
- genetic diversity;
- leading-edge colonization;
In wide-ranging species, the genetic consequences of range shifts in response to climate change during the Pleistocene can be predicted to differ among different parts of the distribution area. We used amplified fragment length polymorphism data to compare the genetic structure of Arabis alpina, a widespread arctic-alpine and afro-alpine plant, in three distinct parts of its range: the North Atlantic region, which was recolonized after the last ice age, the European Alps, where range shifts were probably primarily altitudinal, and the high mountains of East Africa, where the contemporary mountain top populations result from range contraction. Genetic structure was inferred using clustering analyses and estimates of genetic diversity within and between populations. There was virtually no diversity in the vast North Atlantic region, which was probably recolonized from a single refugial population, possibly located between the Alps and the northern ice sheets. In the European mountains, genetic diversity was high and distinct genetic groups had a patchy and sometimes disjunct distribution. In the African mountains, genetic diversity was high, clearly structured and partially in accordance with a previous chloroplast phylogeography. The fragmented structure in the European and African mountains indicated that A. alpina disperses little among established populations. Occasional long-distance dispersal events were, however, suggested in all regions. The lack of genetic diversity in the north may be explained by leading-edge colonization by this pioneer plant in glacier forelands, closely following the retracting glaciers. Overall, the genetic structure observed corresponded to the expectations based on the environmental history of the different regions.