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Number of Apis mellifera (mean ± SE) visiting pairs of male-fertile (MF) and cytoplasmically male-sterile (CMS) carrot umbels in trials. (Trial 1; n = 92 pairs, observations for five minutes per umbel. and Trial 2; n = 13 pairs, observations for 20 minutes per umbel) subdivided into proportions of nectar and pollen collecting bees observed.
