Study Finds Reduced Bee Reproduction Over 2 Years
by Amy Quinton, UC-Davis
The study, published in the journal Proceedings of the National Academy of Sciences, suggests that bees may require multiple generations to recover from even a single application.
Bees play a critical role in agricultural ecosystems, providing pollination for many important crops.
In most agricultural areas, bees may be
exposed to pesticides multiple times, over multiple years. Studies to date have
only looked at exposure to pesticides in one life stage or over one year.
“It was important for us to understand how exposure persists from
one generation to the next,” said lead author Clara Stuligross, a Ph.D.
candidate in ecology at UC Davis. “Our findings suggest we need to be doing
more to help mitigate risks or we limit critical pollination services.”
Reproduction drops
In the study, the blue orchard bee was exposed to imidacloprid — the most commonly used neonicotinoid in California — according to amounts recommended on the label. Neonicotinoids are a class of insecticides chemically related to nicotine. Stuligross said the exposures were similar to what the bees would experience in the field.
Female bees that were exposed to the
insecticide as larvae had 20% fewer offspring than bees not exposed. Those bees
that were exposed as larvae and as adults had 44% fewer offspring.
“We gave them one application in the first year and one in the
second — that’s a pretty standard exposure. Even then, we saw strong results
that added up, each exposure reducing fertility,” said Stuligross.
Populations affected
Because the impacts of insecticides tend to be additive across
life stages, repeated exposure has profound implications for population growth.
The research showed that bees exposed to neonicotinoids in both the first and
second year resulted in a 72% lower population growth rate compared to bees not
exposed at all. Neonicotinoids also persist in the environment long after
application.
The study reveals how past pesticide exposure can have lasting
impacts, said co-author Neal Williams, professor of entomology at UC Davis.
“One could draw parallels to human health where impacts early in development
show up much later in life,” he said. “We just didn’t know the same was true
for bees. Now we do and we need to continue to manage risks appropriately.”
The study was supported by a UC Davis Jastro Research Award, a UC
Davis Ecology Graduate Research Fellowship, a National Science Foundation
Graduate Research Fellowship, the National Science Foundation and the UC Davis
Department of Entomology through the Harry H. Laidlaw Jr. Bee Research Facility
and Laidlaw Endowment.
