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Science 10 October 2008:
Vol. 322. no. 5899, pp. 204 - 206
DOI: 10.1126/science.1165663
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Perspectives

EVOLUTION:
Armor Development and Fitness

William A. Cresko

The fitness of stickleback fish that develop different numbers of external bony plates varies between oceanic and freshwater environments.

Center for Ecology and Evolutionary Biology, Department of Biology, University of Oregon, Eugene, OR 97403-5289, USA. E-mail: wcresko{at}uoregon.edu

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