I saw this article that pertained to some of the mutations that we saw in class. Adapting to Darkness: How Behavioral and Genetic Changes Helped Cavefish Survive Extreme Environment is about how changes in environment lead to evolutionary changes. In this study Mexican Cave Fish were studied since "other than the loss of eyes and lack of pigmentation" you can't tell the two fish apart. In the study they found that in the cave eyes weren't useful since everything was dark, instead they develop and exhibit a Vibration Attraction Behavior (VAB) which has sensory cell masses on the lateral line. This VAB isn't effective for the surface fish since swimming into a disturbance could be a danger since there are more predators towards the surface. I just thought this tied into the other examples we talked about in class where changes in the environment can lead to eventual evolutionary changes. It was interesting how these two fish really do look the same if you can look past the color difference and the cave fish lacks eyes!
The link to the article is here http://www.sciencedaily.com/releases/2010/09/100914171325.htm