Using literature searches and knowledge of the authors, we compiled data from studies that relate some measure of crop pollination services with isolation from natural habitat. Our goal was to be comprehensive, knowing however that we may have failed to detect studies that were yet to be published, or that had been published in journals not abstracted by the ISI. We found 23 relevant studies representing 16 different crops grown in nine countries. Thirteen studies took place in temperate biomes, while 10 were tropical. In all but two three studies, pollinators were bees. The exceptions are Blanche and Cunningham 2005, in which flower visitors were beetles in the family Nitidulidae, Mayfield 2005, in which visitors included flies, bees, beetles, ants, and an introduced weevil, and Kremen in prep (a), in which visitors included bees and flies. One additional study (De Marco and Coelho 2004) addresses similar questions but was not explicit about degrees of isolation from natural habitat, so we were unable to include it.
Seventeen studies are published in peer-reviewed journals, while six are unpublished manuscripts or theses. We corresponded directly with authors of all studies to ensure that data were appropriate for our purposes and to collect necessary data formatted for our purposes; the only exception was for Heard (1994), where we used data from published tables. This data set is used in the following publication: Ricketts, Taylor H., James Regetz, Ingolf Steffan-Dewenter, Saul A. Cunningham, Claire Kremen, Anne Bogdanski, Barbara Gemmill-Herren, Sarah S. Greenleaf, Alexandra M. Klein, Margaret M. Mayfield, Lora A. Morandin, Alfred Ochieng', Simon G. Potts, and Blande F. Viana (2008) Landscape effects on crop pollination services: are there general patterns? Ecology Letters 11(5):499-515. doi:10.1111/j.1461-0248.2008.01157.x