Colour forms of Amazonian cichlid fish represent reproductively isolated species

Journal of Evolutionary Biology - Tập 19 Số 4 - Trang 1139-1148 - 2006
Jonathan Stuart Ready1,2, Iracilda Sampaio3, Horácio Schneider3, Christina Cleo Vinson3, Taciéli dos Santos3, George F. Turner1
1Department of Biological Sciences, University of Hull, Hull, UK
2Department of Vertebrate Zoology, Swedish Museum of Natural History, Stockholm, Sweden
3Federal University of the State of Pará, Bragança, PA, Brazil

Tóm tắt

Abstract Laboratory mate choice experiments have confirmed species status for cichlid fish in the African Great Lakes that differ in colour and little else. Colour differences between allopatric populations of the South American cichlid genus Apistogramma are known for many species, yet the status of such populations has not been previously tested. Analysis of the genetic relationships and mate choice characteristics of populations previously described as Apistogramma caetei from eastern Amazonia indicates genetic differentiation into at least three allopatric lineages, which also show strong prezygotic isolation through female mate choice, confirming them as Biological species. If future studies confirm that this result is indicative of a general trend, the species richness of the South American cichlid fishes may presently be seriously underestimated.

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