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Science 12 September 2008:
Vol. 321. no. 5895, p. 1446
DOI: 10.1126/science.1157390
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Technical Comments

Comment on "A Global Map of Human Impact on Marine Ecosystems"

Michael R. Heath

Halpern et al. (Reports, 15 February 2008, p. 948) integrated spatial data on 17 drivers of change in the oceans to map the global distribution of human impact. Although fishery catches are a dominant driver, the data reflect activity while impacts occur at different space and time scales. Failure to account for this spatial disconnection could lead to potentially misleading conclusions.

Fisheries Research Services, Marine Laboratory, 375 Victoria Road, Aberdeen AB11 9DB, UK. E-mail: heathmr{at}marlab.ac.uk

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