A recent study from the University of Ottawa has unveiled alarming findings regarding the impact of pesticides on wild bee populations. While assessments have traditionally focused on honeybees, the research emphasizes that a significant portion of the world's bee species remains largely unprotected.
Dr. Sabrina Rondeau, a biologist at the university and lead author of the study, stated, "Our findings show that 70% of wild bee species, crucial for pollinating crops, face major risks due to pesticide residues in the soil. Current regulations do not account for this threat." This study, published in the journal Science, sheds light on the oversight in evaluating pesticide risks.
Globally, there are nearly 20,000 known bee species, many of which do not produce honey and live solitary lives. The lack of consideration for these species in pesticide risk assessments raises concerns about their survival. The study particularly notes the potential attraction of bumblebees to pesticide-contaminated soils, where they hibernate during winter, exposing them to toxic substances for extended periods.
Moreover, the research indicates that the effects of pesticides on wild bees extend beyond individual insects, impacting entire populations. The insecticide cyantraniliprole, approved for use in several countries, including France, has been shown to reduce the lifespan and fertility of wild bees, particularly bumblebees.
Additionally, squash bees, which primarily feed on squash pollen, are significantly affected by both insecticides and fungicides. The study explains that these chemicals disrupt the behavior of squash bees and decrease their reproductive success, potentially leading to their extinction in the long term.