Science & Technology

Neonicotinoids can harm bees for generations

A new study found that pesticides have a direct impact on honeybee health, and the effects of past exposures may be passed on to future generations.

Studies published in the journal Minutes of the National Academy of SciencesSuggests that bees may need multiple generations to recover from a single application.

Bees play an important role in agroecosystems and pollinate many important crops. In most agricultural areas Bees You may be exposed to pesticides multiple times over multiple years. Previous studies have examined exposure to only one life stage or pesticide for more than a year.

“It was important for us to understand how exposure persists from generation to generation,” said Clara Sturiglos, lead author and candidate for a doctoral course in ecology at the University of California, Davis. say. “Our findings suggest that we need to do more to mitigate the risk or limit important pollination services.”

In this study, blue orchard bees were exposed to imidacloprid, the most commonly used neonicotinoid in California, according to the amount recommended on the label. Neonicotinoid A class of pesticides that are chemically related to nicotine. Stuligross says the exposure was similar to what bees experience in the field. Female honeybees exposed to pesticides as larvae had 20% fewer offspring than unexposed honeybees.Them Bees 44% fewer offspring were exposed as larvae and as adults.

“We provided one application in the first year and one application in the second year. This is a fairly standard exposure. Still, we got strong results and reduced each exposure to give birth.” Says Stuligross.

Repeated exposures have serious implications for population growth, as the effects of pesticides tend to be additive throughout life stages. Studies show that honeybees exposed to neonicotinoids in both the first and second years resulted in a 72% lower population growth rate than honeybees that were not exposed at all. Neonicotinoids also persist in the environment long after application.

This study reveals how past pesticide exposures can have lasting effects, says co-author Neil Williams, a professor of entomology. “We can draw similarities to human health, where the early effects of development appear much later in life,” he says. “We didn’t know that the same was true for bees. Now we are doing so and we need to continue to manage risk properly.”

This research was conducted through the Harry H. Raidlow Junior Bee Research Facility from the University of California, Davis Jastro Research Award, the University of California, Davis Ecology Graduate Research Fellowship, the National Science Foundation Graduate Research Fellowship, the National Science Foundation, and the University of California, Davis School of Insectology. I received the support of. And Laidlaw Endowment.

sauce: University of California, Davis

Neonicotinoids can harm bees for generations Neonicotinoids can harm bees for generations

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