Palaearctic biogeography revisited: evidence for the existence of a North African refugium for Western Palaearctic biota
Article first published online: 2 AUG 2013
© 2013 John Wiley & Sons Ltd
Journal of Biogeography
Volume 41, Issue 1, pages 81–94, January 2014
How to Cite
Husemann, M., Schmitt, T., Zachos, F. E., Ulrich, W., Habel, J. C. (2014), Palaearctic biogeography revisited: evidence for the existence of a North African refugium for Western Palaearctic biota. Journal of Biogeography, 41: 81–94. doi: 10.1111/jbi.12180
- Issue published online: 16 DEC 2013
- Article first published online: 2 AUG 2013
- German Academic Exchange Service
- Biodiversity hotspot;
- climatic oscillations;
- differentiation centre;
- genetic structure;
- North Africa;
- sea straits;
- species assemblages
In contrast to the attention given to southern Europe both as a centre of speciation and differentiation and as a Pleistocene refugium of Western Palaearctic taxa, North Africa has been relatively neglected. In this paper, we set out to address this shortfall.
North-West Africa and the Mediterranean.
We reviewed the existing literature on the biogeography of North Africa, and carried out analyses of species distribution data using parsimony, nestedness and co-occurrence methods.
In many cases, distribution patterns of non-flying mammals, bats, amphibians, reptiles, butterflies, zygaenid moths and odonates demonstrated important biogeographical affinities between Europe and North Africa at the species level. On the other hand, species co-occurrence, nestedness and parsimony analysis also revealed some deep splits between the Maghreb and Europe; yet even in these cases the closest affinities were found between the Iberian Peninsula and the Maghreb. Furthermore, North Africa harbours the highest proportion of endemic taxa (13.7%) across all groups analysed. Many molecular studies demonstrated a strong genetic cohesiveness between North Africa and Europe despite the potential barrier effect of the Mediterranean Sea. In other taxa, however, remarkable splits were detected. In addition, southern European genetic lineages were often nested within North African clades, and many taxa showed exceptionally high genetic variability and differentiation in this region.
The Maghreb was an important differentiation and speciation centre for thermophilic organisms during the Pliocene and Pleistocene with high relevance as a colonization source for Europe. The regions around the sea straits of Gibraltar and Sicily have acted as important biogeographical links between North Africa and Europe at different times.