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Material and methods: Further details of surveys are given on Science Online, together with tests for possible artifacts or bias in data set comparisons due to differences in sampling effort between surveys and different initial distributions of species in the three groups. Results justify our conclusion that any errors in intertaxon comparisons are one to two orders of magnitude smaller than the pattern of relative changes shown in Fig. 1. The data sets of distributions are held by the following. Plants: NERC's Biological Records Centre (BRC), Monks Wood. Butterflies: BRC and Butterfly Conservation Society. Birds: British Trust for Ornithology.
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We thank the more than 20,000 recorders who contributed to the six atlas surveys and our fellow organizers of surveys: R. A. Chapman, T. D. Dines, D. W. Gibbons, G. Jeffcoate, S. Jeffcoate, P. T. Harding J. Heath, D. A. Pearman, F. H. Perring, E. Pollard, J. B. Reid, J. T. R. Sharrock, S. M. Walters, and M. S. Warren. J.A.T. acknowledges the European Commission for RTD research grant MacMan (EVK2-CT-2001-00126).
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