Document Detail

Laboratory mating trials indicate incipient speciation by sexual selection among populations of the cichlid fish Pseudotropheus zebra from Lake Malawi.
MedLine Citation:
PMID:  15209099     Owner:  NLM     Status:  MEDLINE    
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. We report the results of a laboratory test of assortative mating among Lake Malawi cichlid fishes from five closely related geographical populations differing in male courtship colour. Paternity of clutches was tested using microsatellite DNA typing of offspring. Out of 1955 offspring typed, 1296 (66.3%) were sired by the male from the same population as the female, which is more than three times the rate expected if females do not differentiate among males of the different populations (20%). This result indicates that mate preferences of geographical races are strongly differentiated, consistent with the races representing incipient geographical species diverging under sexual selection exerted by female preferences for different male courtship colours.
Mairi E Knight; George F Turner
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  271     ISSN:  0962-8452     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2004 Apr 
Date Detail:
Created Date:  2004-06-22     Completed Date:  2004-07-20     Revised Date:  2010-09-20    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  675-80     Citation Subset:  IM    
Department of Biological Sciences, University of Hull, Hull HU6 7RX, UK.
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MeSH Terms
Cichlids / genetics,  physiology*
Fresh Water
Microsatellite Repeats / genetics
Pigmentation / physiology*
Population Dynamics
Reproduction / genetics,  physiology*
Selection, Genetic*
Sex Characteristics
Sexual Behavior, Animal / physiology*
Species Specificity

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