一个原始物种可能已经适应了利用一个岛屿上特定的生态位,然后在水上迁徙到其他岛屿定居。
The physical structure of species competing for resources in the same ecological niche tends to gradually evolve in ways that allow them to occupy different niches.争夺同一生态资源的物种趋向于朝着依赖不同资源的方向进化;而相互竞争的物种会逐渐改变他们的活动范围,使其领地不再重叠。
The latter says it is that they are all adapted to live in the same ecological niche.后者则认为是由于它们都适应生活在同一个生态环境。