August 4, 2000

How Dangerous Are Alien Species?

To the Editor:

The unfortunate essay by Mark Sagoff, "Why Exotic Species Are Not as Bad as We Fear" (Opinion, June 23), sounded logical and might be persuasive to the scientifically uninformed. However, it was based on a misunderstanding and contained demonstrable errors of fact.

Sagoff's premise that the introduction of exotic species actually increases biodiversity confuses the number of species with diversity, in which both the number and the

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