Scientists, automated robots, and mini-backpacks equipped with tiny QR codes team up to finally understand how pesticides harm the lives of bees. Read the full scientific article here and check out the lead author’s, James Crall’s, website for details and more awesome video.
Crall JD, Switzer CM, Oppenheimer RL, Ford Versypt A, Dey B, Brown B, Eyster M, Guérin C, Pierce NE, Combes SA, de Bivort BL (2018). Neonicotinoid exposure disrupts bumblebee nest behavior, social networks, and thermoregulation. Science 362, 683–686. PDF
Harvard scientists developed an automated robot to continuously track the behavior of bees to characterize the negative effects of eating ecologically relevant levels of imidacloprid (levels of imidacloprid that they would encounter in the wild).
Specifically, researchers determined that consuming this pesticide harmed bee behavior and the colony’s ability to regulate their nest temperature. Tracking data gathered by the robot revealed that eating imidacloprid impaired normal bee behavior after both a single exposure and repeated exposure to the pesticide.
Bees that consumed daily doses of imidacloprid and bees that ate one single dose of imidacloprid both decreased the amount of time they spent active, the time they spent nursing, and the proportion of time they interacted with other bees compared to bees eating normal nectar. Bees eating imidacloprid also spend more time on the outside of the colony away from the food storage hub and nursery.
An experiment set in the field with natural conditions revealed that bee physiology is also harmed by short term pesticide consumption. Bee colonies weren’t able to regulate their nest’s temperature after 1-2 hours of intermittent feeding on nectar containing imidacloprid. Whereas, colonies feeding on normal nectar maintained nest temperatures above outdoor temperatures.
These elegant series of experiments present new automated technology that enables scientists to answer detailed questions about context specific insect behavior, movement, and social dynamics. The future possibilities are endless: How will bees respond to other pesticides, contaminates, or disease? How do these challenges affect other insect species? How do different insect species socially interact?
But also as a take-home message: don’t use or support neonicotinoid pesticides.
EPA’s action to protect pollinators & ways you can help
Erik Stokstad AAS Science provides an overview of the study, https://www.sciencemag.org/news/2018/11/new-tracking-system-could-show-last-how-pesticides-are-harming-bee-colonies