Rarity as double jeopardy

作者: Kevin J. Gaston

DOI: 10.1038/28288

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摘要: What factors contribute to extinction of a species? Conventional wisdom has it that those species have many members (high abundance) spread over large geographical range greater chance survival than less abundant, clustered populations. But turns out this is not all. A study Australian marsupials now reveals relatively recent evolutionary origin show positive relationship between local abundance and spread, whereas more ancient negative relationship. Presumably, because the relatives who showed low small ranges already become extinct.

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