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Science 17 January 2003:
Vol. 299. no. 5605, p. 325
DOI: 10.1126/science.299.5605.325a
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News of the Week

EVOLUTIONARY BIOLOGY:
On Ant Farm, a Threesome Coevolves

Elizabeth Pennisi

Certain ants and the fungi they cultivate have evolved in synchrony for millions of years. But there is a third wheel in this relationship--a pathogen that infects the fungi. Researchers report on page 386 that, in terms of evolutionary history, this pathogen is as tightly entwined with the other two as they are with each other.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)