Journal Article10.1126/SCIENCE.277.5333.1808
Cichlid Fish Diversity Threatened by Eutrophication That Curbs Sexual Selection
TL;DR: Cichlid fish species of Lake Victoria can interbreed without loss of fertility but are sexually isolated by mate choice, and human activities that increase turbidity destroy both the mechanism of diversification and that which maintains diversity.
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Abstract: Cichlid fish species of Lake Victoria can interbreed without loss of fertility but are sexually isolated by mate choice. Mate choice is determined on the basis of coloration, and strong assortative mating can quickly lead to sexual isolation of color morphs. Dull fish coloration, few color morphs, and low species diversity are found in areas that have become turbid as a result of recent eutrophication. By constraining color vision, turbidity interferes with mate choice, relaxes sexual selection, and blocks the mechanism of reproductive isolation. In this way, human activities that increase turbidity destroy both the mechanism of diversification and that which maintains diversity.
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Citations
A genetically explicit model of speciation by sensory drive within a continuous population in aquatic environments
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Biodiversity conservation in African inland waters: Lessons of the Lake Victoria region
Lauren J. Chapman,Colin A. Chapman,Les Kaufman,Frans Witte,J.S. Balirwa +4 more
- 01 Jan 2008
TL;DR: In this paper, Biodiversity conservation in African inland waters: Lessons of the Lake Victoria region is discussed, with a focus on the Lake of Lake Victoria in South-West Africa.
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Can male-male competition stabilize speciation? A test in Lake Victoria haplochromine cichlid fish
Peter D. Dijkstra,Ole Seehausen,Ole Seehausen,Ole Seehausen,Boye L. A. Gricar,Martine E. Maan,Ton G. G. Groothuis +6 more
TL;DR: The finding that the differential allocation of aggression would create an advantage for males of the less abundant phenotype or species, thereby potentially supporting stable coexistence of the phenotypes is discussed.
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