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The mean (± SE) percentage oilseed rape pollen in larval food of O. bicornis in oilseed rape fields adjacent to grassland (oilseed rape + grassland; n = 17), grasslands adjacent to oilseed rape (grassland + oilseed rape; n = 17) and isolated grasslands (grassland − oilseed rape; n = 16). Data from isolated oilseed rape field were not analyzed, because only 2 of 17 fields had been colonized by O. bicornis. Different letters indicate significant differences (P < 0.05; Tukey contrasts)
