Dr Martina Bradic who lead the research continued, "Despite interbreeding and gene flow from the surface populations the eyeless 'cave phenotype' has been maintained in the caves. This indicates that there must be strong selection pressure against eyes in the cave environment. Whatever the advantage of the eyeless condition, it may explain why different populations of A. mexicanus cave fish have independently evolved the same eyeless condition, a striking example of convergent evolution."
Dr Hilary Glover
Scientific Press Officer, BioMed Central
Notes to Editors
1. Gene flow and population structure in the Mexican blind cavefish complex (Astyanax mexicanus) Martina Bradic, Peter Beerli, Francisco Garca-de Len, Sarai Esquivel-Bobadilla and Richard Borowsky BMC Evolutionary Biology (in press)
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