A pharyngeal jaw evolutionary innovation facilitated extinction in Lake Victoria cichlids.
نویسندگان
چکیده
Evolutionary innovations, traits that give species access to previously unoccupied niches, may promote speciation and adaptive radiation. Here, we show that such innovations can also result in competitive inferiority and extinction. We present evidence that the modified pharyngeal jaws of cichlid fishes and several marine fish lineages, a classic example of evolutionary innovation, are not universally beneficial. A large-scale analysis of dietary evolution across marine fish lineages reveals that the innovation compromises access to energy-rich predator niches. We show that this competitive inferiority shaped the adaptive radiation of cichlids in Lake Tanganyika and played a pivotal and previously unrecognized role in the mass extinction of cichlid fishes in Lake Victoria after Nile perch invasion.
منابع مشابه
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متن کاملPii: S0169-5347(97)01239-1
1 T explosive speciation of cichlid fishes in the African great lakes has intrigued biologists for many decades. Interest was revitalized in 1996 after the publication in Science of geological data1 indicating that the youngest lake, Lake Victoria, must have been completely dry during the most recent Ice Age – perhaps as recently as 12 400 years ago. This implies that the approximately 500 hapl...
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ورودعنوان ژورنال:
- Science
دوره 350 6264 شماره
صفحات -
تاریخ انتشار 2015