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The mean number (±SE) of Red Mason Bee Osmia bicornis brood cells in trap nests in a oilseed rape fields adjacent to grassland (oilseed rape + grassland; n = 17) versus isolated oilseed rape fields (oilseed rape − grassland; n = 17; model with presence–absence data), b grasslands adjacent to oilseed rape (grassland + oilseed rape; n = 17) versus isolated grasslands (grassland − oilseed rape; n = 16; model with number of brood cell data)
