More evidence showing that systemic neonicotinoids are having a significant impact
By Summit Voice
FRISCO — Even if systemic neonicotinoid pesticides don’t kill bees directly, they are contributing to the collapse of honey bee colonies, according to new research by scientists from Royal Holloway University.
Low-level exposure can change bees’ behavior, causing them to stop working properly for their colonies. The results suggest that exposure to pesticides at levels bees encounter in the field, has subtle impacts on individual bees, and can eventually make colonies fail.
The scientists said their discovery provides an important breakthrough in identifying the reasons for the recent global decline of bees, a trend that has baffled many experts worldwide.
“One in three mouthfuls of our food depend on bee pollination,” said lead author, Dr. John Bryden, with the School of Biological Sciences at Royal Holloway. “By understanding the complex way in which colonies fail and die, we’ve made a crucial step in being able to link bee declines to pesticides and other factors, such as habitat loss and disease which can all contribute to colony failure.”
“Exposing bees to pesticides is a bit like adding more and more weight on someone’s shoulders. A person can keep walking normally under a bit of weight, but when it gets too much – they collapse. Similarly, bee colonies can keep growing when bees aren’t too stressed, but if stress levels get too high the colony will eventually fail,” Bryden said.
“Our research provides important insights to the biology of pollinators,” said co-author Professor Vincent Jansen. “It is intriguing that the way in which bees work together is the key to their success, but could also contribute to their decline and colony failure.”
The research was funded as part of the £10 million ‘Insect Pollinators Initiative,’ set-up to understand the causes of pollinator declines and safeguard future pollination services.
“Pesticides can have a detrimental effect on bees at levels used in the field,” said co-author Dr. Nigel Raine. “Our research will provide important evidence for policymakers. The way we test pesticides, the way we assess their impact on bees, and the way we manage pesticides can all be improved.”