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Science 10 December 1999:
Vol. 286. no. 5447, p. 2071
DOI: 10.1126/science.286.5447.2071d
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Random Samples

Waterway-choking foreign species such as the zebra mussel have made big inroads in the Great Lakes in the past 190 years, as seen in this chart from a report by the Heinz Center, a Washington, D.C., think tank. Commissioned by the White House Office of Science and Technology Policy, the report (at www.us-ecosystems.org) assesses what are the most useful yardsticks of ecosystem health. This one focuses on croplands, forests, oceans, and coastal areas. The next roundup, in 2001, will also cover cities and suburbs, arid and rangelands, and more freshwater.

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