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Science 15 April 2005:
Vol. 308. no. 5720, p. 337
DOI: 10.1126/science.308.5720.337a
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News of the Week

GEOCHEMISTRY:
Gasping for Air in Permian Hard Times

Richard A. Kerr

On page 398, researchers hypothesize that low atmospheric oxygen late in the Permian period squeezed land animals into smaller, more fragmented areas at low altitudes, inducing extinctions while driving down diversity.

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