| reverse evolution of armor plates in the threespine stickleback. | faced with sudden environmental changes, animals must either adapt to novel environments or go extinct. thus, study of the mechanisms underlying rapid adaptation is crucial not only for the understanding of natural evolutionary processes but also for the understanding of human-induced evolutionary change, which is an increasingly important problem [1-8]. in the present study, we demonstrate that the frequency of completely plated threespine stickleback fish (gasterosteus aculeatus) has increased ... | 2008 | 18485710 |