Present address: Division of Biology, Imperial College London, Silwood Park, Ascot SL5 7PY, UK.
Cyclamen: time, sea and speciation biogeography using a temporally calibrated phylogeny
Article first published online: 1 OCT 2008
© 2008 The Authors. Journal compilation © 2008 Blackwell Publishing Ltd
Journal of Biogeography
Volume 36, Issue 7, pages 1234–1252, July 2009
How to Cite
Yesson, C., Toomey, N. H. and Culham, A. (2009), Cyclamen: time, sea and speciation biogeography using a temporally calibrated phylogeny. Journal of Biogeography, 36: 1234–1252. doi: 10.1111/j.1365-2699.2008.01971.x
- Issue published online: 22 JUN 2009
- Article first published online: 1 OCT 2008
- Allopatric speciation;
- Bayesian analysis;
- historical biogeography;
- molecular dating;
- secondary dating
Aim The Mediterranean region is a species-rich area with a complex geographical history. Geographical barriers have been removed and restored due to sea level changes and local climatic change. Such barriers have been proposed as a plausible mechanism driving the high levels of speciation and endemism in the Mediterranean basin. This raises the fundamental question: is allopatric isolation the mechanism by which speciation occurs? This study explores the potential driving influence of palaeo-geographical events on the speciation of Cyclamen (Myrsinaceae), a group with most species endemic to the Mediterranean region. Cyclamen species have been shown experimentally to have few genetic barriers to hybridization.
Location The Mediterranean region, including northern Africa, extending eastwards to the Black Sea coast.
Methods A generic level molecular phylogeny of Myrsinaceae and Primulaceae is constructed, using Bayesian approximation, to produce a secondary age estimate for the stem lineage of Cyclamen. This estimate is used to calibrate temporally an infrageneric phylogeny of Cyclamen, built with nrDNA ITS, cpDNA trnL-F and cpDNA rps16 sequences. A biogeographical analysis of Cyclamen is performed using dispersal–vicariance analysis.
Results The emergence of the Cyclamen stem lineage is estimated at 30.1–29.2 Ma, and the crown divergence at 12.9–12.2 Ma. The average age of Cyclamen species is 3.7 Myr. Every pair of sister species have mutually exclusive, allopatric distributions relative to each other. This pattern appears typical of divergence events throughout the evolutionary history of the genus.
Main conclusions Geographical barriers, such as the varying levels of the Mediterranean Sea, are the most plausible explanation for speciation events throughout the phylogenetic history of Cyclamen. The genus demonstrates distributional patterns congruent with the temporally reticulate palaeogeography of the Mediterranean region.