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
Adaptive Dynamics of Speciation: Ecological Underpinnings
Stefan A.H. Geritz,Éva Kisdi,Éva Kisdi,Géza Meszéna,Johan A. J. Metz,Johan A. J. Metz +5 more
- 01 Nov 2004
TL;DR: The adaptive dynamic analysis reveals the course of long-term evolution expected in a given ecological scenario and shows whether, and under which conditions, a population is expected to evolve toward a state in which disruptive selection arises and promotes speciation.
A qualitative ecological risk assessment of the invasive Nile tilapia, Oreochromis niloticus in a sub‐tropical African river system (Limpopo River, South Africa)
Tsungai A. Zengeya,Tsungai A. Zengeya,Mark P. Robertson,Anthony J. Booth,Christian Timothy Chimimba +4 more
TL;DR: The South African Working for Water (WfW) Project through the DST-NRF Centre of Excellence for Invasion Biology (CIB), University of Pretoria, South Africa as mentioned in this paper
Intrasexual competition among females and the stabilization of a conspicuous colour polymorphism in a Lake Victoria cichlid fish
TL;DR: It is proposed that where females are territorial and competitive, aggression biases in females may also promote coexistence of female morphs, and concluded that female–female aggression may be one important force for stabilizing colour polymorphism in cichlid fish.
Changes in pollution indicators in Lake Victoria, Kenya and their implications for lake and catchment management
Rodrick Kundu,Christopher Mulanda Aura,Chrispine Nyamweya,Simon Agembe,Lewis Sitoki,Henry B. O. Lung'ayia,Collins Ongore,Zachary Ogari,Kenneth Werimo +8 more
TL;DR: In this paper, the authors evaluated the use of changes in pollution indicators in Lake Victoria, Kenya, as a decision support tool for fisheries management and productivity, and indicated a declining trend of ecological integrity in the Winam Gulf, compared with the open waters of Lake Victoria.
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Cichlid species diversity in naturally and anthropogenically turbid habitats of Lake Victoria, East Africa
Frans Witte,Frans Witte,Ole Seehausen,Ole Seehausen,Jan H. Wanink,Mary A. Kishe-Machumu,Marjolein Rensing,Tijs Goldschmidt +7 more
TL;DR: Clear water seems to support differentiation in feeding techniques as well as year-round spawning, and both may facilitate species coexistence, which may explain why, since the decline of Nile perch, haplochromine densities have recovered, the numbers of hybrids increased and species diversity in the current eutrophic sub-littoral waters has remained 70 % lower than before the environmental changes.
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