|Publication Type:||Journal Article|
|Year of Publication:||1998|
|Authors:||F. Witte, Seehausen, O. , van Alphen, J. J. , Bouton, N.|
|Journal:||Journal of Fish Biology|
|Keywords:||01344 Reproduction and development, Africa, Victoria L., Article, Article Subject Terms: Biological speciation, Article Taxonomic Terms: Cichlidae, behavior, Cichlid, cichlids, D 04668 Fish, Evolution, fish, Geographic Terms: Africa, Victoria L., HAPLOCHROMIS, Isolating mechanisms, Lake Fisheries, Lakes, mate choice, Mate selection, Mouth brooders, populations, Q1, Q1 01423 Behaviour, Reproductive behaviour, Sexual behaviour, Sexual isolation, Spawning, Spawning grounds, Spawning seasons, Species diversity, SW 0850 Lakes, Sympatric, Y 25525 Fish|
Mate choice may play an important role in animal speciation. The haplochromine cichlids of Lake Victoria are suitable to test this hypothesis. Diversity in ecology, coloration and anatomy evolved in these fish faster than postzygotic barriers to gene flow, and little is known about how this diversity is maintained. It was tested whether recognizable forms are selection-maintained morphs or reproductively isolated species by investigating in the field reproductive timing, location of spawning sites, and mate choice behaviour. There was a large interspecific overlap in timing of breeding and location of spawning sites, which was largest in members of the same genus. Behavioural mate choice of such closely related taxa was highly assortative, such that it is likely that they are sexually isolated species and that direct mate choice is the major force that directs gene flow and maintains form diversity. The results differ from what is known about recent radiations of other lacustrine fish groups where speciation seems to be driven by diverging microhabitat preferences or diverging timing of reproduction, but are in agreement with predictions from models of speciation by diverging mate preferences.
|Alternate Journal:||J. Fish Biol.|
Direct mate choice maintains diversity among sympatric cichlids in Lake Victoria
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