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Nature 437, 318 (15 September 2005) | doi:10.1038/437318a; Published online 14 September 2005

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Re-wilding: introductions could reduce biodiversity

Christopher Irwin Smith1

  1. Department of Biological Sciences, University of Idaho, Moscow, Idaho 83844, USA

The Commentary article by Josh Donlan and colleagues ("Re-wilding North America" Nature 436, 913–914; 2005) argues for the introduction of old-world mammals to North America, on the grounds that these are proxies for megafauna that lived there at the end of the Pleistocene. This perspective overlooks environmental changes that have occurred during the intervening millennia, and that have produced qualitatively different communities in new ecological equilibria.

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