In what could be called one of the fastest evolutionary change in an organism, fish in a remote crater lake in Nicaragua are developing a new physical feature - very fat lips. It has taken the lake cichlids just 100 generations and as many years to evolve this feature. Most estimates of how fast species evolve new features are based on models, which generally indicate that it could take up to 10,000 generations. While some models suggest just tens of generations are enough, but such rapid change has never been documented before.
Elmer KR, Lehtonen TK, Kautt AF, Harrod C, Meyer A (2010) - Rapid sympatric ecological differentiation of crater lake cichlid fishes within historic times - BMC Biology - 12 May 2010 - doi:10.1186/1741-7007-8-60
http://www.biomedcentral.com/content/pd ... 7-8-60.pdf
Discussions on cichlid behaviour in nature & captivity.
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Change in habit, producing change of function, is the main cause of the production of change in living structure. F. Wood Jones (1953) Trends of life