Laboratory mating trials indicate incipient speciation by sexual selection among populations of the cichlid fish Pseudotropheus zebra from Lake Malawi

A cura di Knight, Mairi E & Turner, G.F

Proceedings of the Zoological Society of London, 271: 675-680 2004


" It has been suggested that sexual selection may have played a major role in the rapid evolution of hundreds of species of cichlid fishes in Lake Malawi. Here we report the results of the first published laboratory test of assortative mating among Lake Malawi cichlid fishes from five closely-related geographic populations differing in male courtship colour. Paternity of clutches was tested using microsatellite DNA typing of offspring. Of 1,955 offspring typed, 1,296 (66.3%) were sired by the male from the same population as the female, which was more than three times the rate expected if females did not differentiate among males of the different populations (20%). This result indicates that mate preferences of geographic races are strongly differentiated, consistent with them representing incipient geographic species diverging under sexual selection exerted by female preferences for different male courtship colours "

Classificazione: Comportamento, Lago Malawi.

Lingua: English

Knight, Mairi E & Turner, G.F. 2004. "Laboratory mating trials indicate incipient speciation by sexual selection among populations of the cichlid fish Pseudotropheus zebra from Lake Malawi". Proceedings of the Zoological Society of London. 271: 675-680 (crc02342) (riassunto)