Common insecticides affect the amount of night's sleep in bumblebees and fruit flies

Just like us, many insects need a decent night's sleep to function properly, but this might not be possible if they have been exposed to neonicotinoid insecticides, the most common form of insecticide used worldwide, suggests research by academics at the University of Bristol.

Two studies by scientists at Bristol's Schools of Physiology, Pharmacology and Neuroscience and Biological Sciences have shown these insecticides affect the amount of sleep taken by both bumblebees and fruit flies, which may help us understand why insect pollinators are vanishing from the wild.

The neonicotinoids we tested had a big effect on the amount of sleep taken by both flies and bees. If an insect was exposed to a similar amount as it might experience on a farm where the pesticide had been applied, it slept less, and its daily behavioral rhythms were knocked out of synch with the normal 24-hour cycle of day and night."

Dr. Kiah Tasman, Study Lead Author and Teaching Associate, School of Physiology, Pharmacology, and Neuroscience, University of Bristol

The fruit fly study published today [21 January] in Scientific Reports, allowed the researchers to study the impact of pesticides on the insect brain.

As well as finding that the typical agricultural concentration of neonicotinoids ruined the flies' ability to remember, the researchers also saw changes in the clock in the fly brain which controls its 24-hour cycle of day and night.

Dr. James Hodge, Associate Professor in Neuroscience in the School of Physiology, Pharmacology, and Neuroscience and senior author for the study, added: "Being able to tell time is important for knowing when to be awake and forage, and it looked like these drugged insects were unable to sleep. We know quality sleep is important for insects, just as it is for humans, for their health and forming lasting memories."

Dr. Sean Rands, Senior Lecturer in the School of Biological Sciences and co-author, explained: "Bees and flies have similar structures in their brains, and this suggests one reason why these drugs are so bad for bees is they stop the bees from sleeping properly and then being able to learn where food is in their environment.

"Neonicotinoids are currently banned in the EU, and we hope that this continues in the UK as we leave EU legislation."

Source:
Journal reference:

Tasman, K., et al. (2021) Neonicotinoids disrupt memory, circadian behaviour and sleep. Scientific Reports. doi.org/10.1038/s41598-021-81548-2.

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