Extreme microallopatric divergence in a cichlid species from Lake Malawi

@article{Rico2002ExtremeMD,
  title={Extreme microallopatric divergence in a cichlid species from Lake Malawi},
  author={Ciro Rico and George F. Turner},
  journal={Molecular Ecology},
  year={2002},
  volume={11}
}
We demonstrate significant population structuring on an extremely small spatial scale between adjacent demes of a Lake Malawi haplochromine cichlid species of the mbuna group, Pseudotropheus callainos, separated by only 35 m of habitat discontinuity. This substantiates further the notion that intralacustrine allopatric divergence may help to explain the high level of species richness of the mbuna in comparison to other Malawian cichlids, as well as of the Malawian haplochromines as a whole. 

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Evidence that populations with red dorsal fins (RT) are not monophyletic is presented, implying that divergence in coloration may accompany speciation, and that allopatric populations with similar coloration cannot be assumed to be conspecific.

Genetic relationships of cichlid fishes from Lake Malawi based on mitochondrial DNA sequences

It was suggested that non-mbuna have attained much higher diversification than mbuna, which may partly be attributable to sexual selection strongly exerted in rocky habitats in contrast to strong ecological selection in sandy area.
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