PORTLAND, Maine — Scientists studying a widely used pesticide say even small doses of the chemical can have crippling health effects on migrating birds, and it might be contributing to declines in their overall populations.
The researchers with the University of Saskatchewan will publish their research about the insect-killer imidacloprid in the journal Science on Friday. The insecticide is among a class called neonicotinoids that has been widely studied for its health impacts on bees.
The scientists studied white-crowned sparrows that consumed small doses of the pesticide and found that the birds experienced weight loss and delays in migration. They say those changes can hinder the birds’ ability to reproduce and survive, and that might be contributing to songbird population declines.
Farmers use imidacloprid to control pests that can damage crops.