Pollen-deprived bumblebees may speed up plant blooming by biting leaves

Thursday, May 21, 2020 - 14:20 in Biology & Nature

Here’s a bumblebee tip that might get a slowpoke plant to bloom early. Just bite its leaves. At least three species of bumblebees use their mouthparts to snip little confetti bits out of plant foliage, researchers report in the May 22 Science. This foliage biting gets more common when there’s a pollen shortage, says Consuelo De Moraes, a chemical ecologist and entomologist at ETH Zurich. Experiments show that mustard and tomato plants nibbled by Bombus terrestris bees bloomed earlier than unbitten plants by days, or even weeks, say De Moraes and her colleagues. So for the bumblebees, accelerating bloom times could be a lifesaver. When trying to found colonies in early spring, the bees rely on flower pollen as a protein source for raising their young. Foteini Paschalidou, an ecologist now at France’s National Institute for Agricultural Research in Versailles-Grignon, was the first team member to call attention to the behavior. She was working on a different project with caged B. terrestris bees...

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