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Science 1 June 2007:
Vol. 316. no. 5829, p. 1285
DOI: 10.1126/science.1137946
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Technical Comments

Comment on "Impacts of Biodiversity Loss on Ocean Ecosystem Services"

Michael J. Wilberg* and Thomas J. Miller

Worm et al. (Research Articles, 3 November 2006, p. 787) reported an increasing proportion of fisheries in a "collapsed" state. We show that this may be an artifact of their definition of collapse as a fixed percentage of the maximum and that an increase in the number of managed fisheries could produce similar patterns as an increase in fisheries with catches below 10% of the maximum.

Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, P.O. Box 38, Solomons, MD 20688, USA.

* To whom correspondence should be addressed. E-mail: wilberg{at}cbl.umces.edu

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