Bees are an important factor for our environment and our sustenance. Without insect pollination, many plant species—including various crops—cannot reproduce. “Bee mortality therefore affects food supply for human beings,” said Professor Sara Leonhardt, who specializes in plant-insect interactions. All of the worldwide more than 20,000 bee species need to be considered. Among these, bumble bees are of particular importance besides the famous honey bee.
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Source: Phys.org