Present address : M. J. H. Van Oppen, Australian Institute of Marine Science, PMB No. 3, Townsville MC, Queensland 4810, Australia.
No evidence for parallel sympatric speciation in cichlid species of the genus Pseudotropheus from north-western Lake Malawi
Article first published online: 11 DEC 2002
Journal of Evolutionary Biology
Volume 16, Issue 1, pages 37–46, January 2003
How to Cite
Rico, C., Bouteillon, P., Van Oppen, M. J. H., Knight, M. E., Hewitt, G. M. and Turner, G. F. (2003), No evidence for parallel sympatric speciation in cichlid species of the genus Pseudotropheus from north-western Lake Malawi. Journal of Evolutionary Biology, 16: 37–46. doi: 10.1046/j.1420-9101.2003.00477.x
- Issue published online: 11 DEC 2002
- Article first published online: 11 DEC 2002
- Received 6 February 2002;revised 5 August 2002;accepted 6 September 2002
- cichlid fish;
- Lake Malawi;
- parallel speciation;
- population structure
Abstract To test the hypothesis of parallel speciation by sexual selection, we examined length variation at six microsatellite loci of samples from four sites of four to six putative species belonging to two subgenera of rocky shore mbuna cichlids from Lake Malawi. Almost all fixation indices were significantly different from zero, suggesting that there is presently little or no gene flow among allopatric populations or sympatric species. Analysis of variance indicated that genetic distances among allopatric populations of putative conspecifics were significantly lower than among sympatric populations of heterospecifics. The topology of trees based on distance matrices was also largely consistent with the hypothesis that the putative species are monophyletic and have thus not evolved in parallel in their present locations. If parallel speciation does occur in Malawi cichlids, it may be on a larger spatial scale than investigated in our study.