2014年9月25日 Nature

nero1981

2014年9月25日 Nature 7 t' _) J7 d* e! A
% T, G$ N0 M0 @. e' L) s! S
& l6 e" b( B3 D- |. J$ `
According to the theory of island biogeography, the number of species (richness) is determined by how an island's area and isolation govern rates of colonization, extinction and speciation. There is a long history of human introduction of anole lizards to Caribbean islands, hitching a ride on on crops such as pineapple and recently on ornamental plants for hotel gardens. Matt Helmus et al. take advantage of this spread of exotic species to conduct a large-scale direct test of the theory of island biogeography. Their results confirm some theoretical predictions — geographic area remains a good positive predictor of species richness, for instance. But in a world dominated by humans, geographic isolation as a negative predictor of richness has been replaced by economic isolation. For example, shipping traffic among islands is unrelated to geographic isolation and is instead linked to trade policy — illustrated by the fact that the US embargo has reduced the number of exotic anoles established on Cuba. Cover: Cuban green anole (Anolis porcatus) established in the Dominican Republic (photo: Miguel Landestoy T)
& Q7 G8 O9 R: {" Z9 _7 g

游客，如果你要查看本帖隐藏内容请回复

* F/ h/ c7 q6 x+ X( q$ M  L