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Figure 12


Fig. 12. Reduction of the retina and central regions of the visual system in cave fish. (A) Eye loss in cave populations of Astyanax mexicanus that have been isolated for approximately 1 million years. The photograph shows one eyeless cave fish (foreground) and two fish from closely related surface-dwelling populations. (B) Reduction in the relative size of the brain regions associated with visual processing in fish species living permanently in caves. (i) Amblyopsis spelaea, a fish species living exclusively in caves. (ii) Chologaster agassizi, a fish species occasionally found in caves but also in surface environments. Adapted from Poulson and White (Poulson and White, 1969). Photograph by R. Borowsky, reproduced with permission.





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