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Buffer zones for biodiversity of plants and arthropods: is there a compromise on width?

Fig. 3.15. Estimated average number per transect of butterfly species (Left) and Shannon’s index (right) at each of the three sampling periods. Period 1: After herbicide application (May). Period 2: After first insecticide application (June). Period 3: After second insecticide application (July). In Appendix D Tables D.3, 4, 7 & 8 the 95% Confidence limits and significant differences at each distance are presented.

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Version 1.0 November 2009, © Danish Environmental Protection Agency