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HSP90: habitat "stress" accelerates evolution, disrupting mutation inhibitor
http://io9.com/how-the-cavefish-lost-its-eyes-1481689405Evolution is much more complex than "survival of the fittest". Even evolution itself is adaptive through biological/chemical mechanisms.
"Usually when people think about mechanisms of evolution, they think about coding changes, regulatory changes and other things, but this is a different mechanism that acts through standing genetic variation," Rohner said. "This evidence will hopefully help in convincing people that this might be a valid mechanism — at least in cases where you are dealing with rapid changes in the environment."
http://hypercube.us/forum/science/hsp90-habitat-'stress'-accelerates-evolution-disrupting-mutation-inhibitor/