Size‐related selection of food plants by bumblebees

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<jats:p><jats:bold>Abstract. </jats:bold> 1. A positive correlation between the tongue length of conspecific workers collecting nectar from seven plant species and the corolla length of the flowers probed was found for <jats:italic>B.lapidarius</jats:italic> and <jats:italic>B.pascuomm</jats:italic> but not <jats:italic>B.terrestris</jats:italic>. No simple relationship was found between the volume, sugar weight or concentration of nectar in flowers and the tongue or wing length of probing bees.</jats:p><jats:p>2. <jats:italic>B.terrestris</jats:italic> workers collecting pollen from four plant species producing pollen only, were found to differ in size according to the type of pollen presentation mechanism and the pollen content per flower. Body size variation was also related to the foraging of pollen plus nectar from two other plant species.</jats:p>

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