The area requirements of an ecosystem service: crop pollination by native bee communities in California.

Kremen, C., N.M. Williams, R.L. Bugg, J.P. Fay and R.W. Thorp. 2004. The area requirements of an ecosystem service: crop pollination by native bee communities in California. Ecology Letters 7: 1109-1119. Keywords: 4j, 6a, 10

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