2014年9月25日 Nature

nero1981

2014年9月25日 Nature % D5 T* Y6 b  M

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8 b2 i2 Z4 z/ F" N8 _3 N. zAccording 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 But in a world dominated by humans, geographic isolation as a negative predictor of richness has been replaced by economic isolation.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)- p: k! L+ ^# C: X7 `; n# m

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