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Science 21 November 1997:
Vol. 278. no. 5342, p. 1377
DOI: 10.1126/science.278.5342.1377g
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The eggs and larvae of marine organisms can be transported over great distances. Based on a detailed analysis of the surface currents and assuming a larval lifespan of 1 or 2 months, Roberts (p. 1454; see the Perspective by Ogden, p. 1414) mapped out potential "transport envelopes" that link different reef areas around the Caribbean. Such studies could help in assigning priority for preservation by identifying "upstream" supplier sites.

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