The declines in bee and pollinator populations in recent years are most likely due to which scenario?

• A. A combination of factors
• B. Pesticide exposure alone
• C. Pathogens alone
• D. Parasitic mites alone

Answer: (A)

Bees and other pollinators are affected by multiple, interacting stressors, not just one factor. The declines observed across different regions and species are best explained by several factors working together rather than a single cause. For instance, Varroa mites severely weaken bees and transmit viruses, while pesticide exposure can impair navigation, foraging, and immune function. When bees face poor nutrition or habitat loss, their resilience drops, making the effects of pesticides and pathogens even more damaging. These stressors can amplify each other: a colony stressed by mites and poor nutrition is more vulnerable to pathogens, and pesticide exposure can heighten disease susceptibility. Because the real-world pattern shows damage from several sources that interact, a scenario involving a combination of factors provides the most accurate explanation for the widespread declines.