Evolution of a cichlid fish in a Lake Malawi satellite lake

被引:34
|
作者
Genner, Martin J. [1 ]
Nichols, Paul
Carvalho, Garyr.
Robinson, Rosanna L.
Shaw, Paul W.
Smith, Alan
Turner, George F.
机构
[1] Univ Hull, Dept Biol Sci, Kingston Upon Hull HU6 7RX, N Humberside, England
[2] Marine Biol Assoc United Kingdom Lab, Plymouth PL1 2PB, Devon, England
[3] Univ Wales, Sch Biol Sci, Bangor LL57 2UW, Gwynedd, Wales
[4] Royal Holloway Univ London, Sch Biol Sci, Egham TW20 0EX, Surrey, England
基金
英国自然环境研究理事会;
关键词
peripatric speciation; adaptation; sexual selection; morphometrics; mitochondrial DNA; growth rates;
D O I
10.1098/rspb.2007.0619
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Allopatric divergence in peripheral habitats may lead to rapid evolution of populations with novel phenotypes. In this study we provide the first evidence that isolation in peripheral habitats may have played a critical role in generation of Lake Malawi's cichlid fish diversity. We show that Lake Chilingali, a satellite lake 11.5 km from the shore of Lake Malawi, contains a breeding population of Rhamphochromis, a predatory genus previously thought to be restricted to Lake Malawi and permanently connected water bodies. The Lake Chilingali population is the smallest known Rhamphochromis, has a unique male nuptial colour pattern and has significant differentiation in mitochondrial DNA from Lake Malawi species. In laboratory mate choice trials with a candidate sister population from Lake Malawi, females showed a strong tendency to mate assortatively indicating that they are incipient biological species. These data support the hypothesis that isolation and reconnection of peripheral habitats due to lake level changes have contributed to the generation of cichlid diversity within African lakes. Such cycles of habitat isolation and reconnection may also have been important in evolutionary diversification of numerous other abundant and wide-ranging aquatic organisms, such as marine fishes and invertebrates.
引用
收藏
页码:2249 / 2257
页数:9
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