... of Ecology and Evolutionary Biology, Brown University,Box G-W, Providence, Rhode Island 02912 USA.Thompson, John N. Department of Ecology and Evolutionary Biology, Earth and ... Differences in the relativeabundances of banded and unbanded morphs be-tween mainland and island populations, and amongyoung-of-the-year, juvenile, and adult individuals,suggest that ... individuals. Together, chapters 1 and 2 consider the causes and evolutionary conse-quences of variation in both unstructured and structured populations, and we highlight our viewthat...