Monday, March 8, 2010
The Geography of Life: Oceanic Islands
Oceanic islands prove to be strong evidence for evolution versus creationism from pages 100-109. Although these islands are suitable for mammals, amphibians, reptiles, and fishes, there is an obvious pattern that unless introduced by man, many of these organisms have not evolved in these areas. Coyne defines oceanic islands as islands that were "never connected to a continent... [and having] unbalanced biotas" since the organisms usually found to inhabit these islands belong to similar species such as the Gálapagos finches. How do these places differ from continental islands and support the theme of evolution? Think about the different adaptive radiations and why life on these islands is unbalanced. Also, site specific examples of these adaptive radiations and explain evolution in terms of adaptations, which allow an organism to gain selective advantages in a specific environment.