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Effect of nectar temperature on feeding by honeybees. Bees ingested a 10% w/w sucrose solution maintained at 20°C, 25°C, 30°C or 35°C. (a) Crop loads (µl) of individual bees (n = 38–56 bees from each of 10 colonies). (b) Total volume (ml) consumed by colonies (n = 10) in 2 h. Small squares are median values, boxes indicate the interquartile range and whiskers indicate minimum and maximum values. Different letters indicate significant differences between nectar temperatures.
