Behavioral and neurophysiological evaluation of pyrethroid effects on honey bee olfactory perception and learning.
Colin-Duchevet L, Couto A, Charnet P, Sandoz JC
Pollinators
Every time you spray a pyrethroid insecticide (many common garden bug-killers) near blooming plants, the bees visiting your garden may survive the dose but lose their ability to remember which flowers are worth returning to.
Scientists tested two common bug-killing chemicals on honey bees at doses that didn't kill them outright. The bees became worse at learning to recognize smells and remembering which scents led to food — skills they need to be good pollinators. Interestingly, the chemicals didn't disrupt how the bees' nose-brain first processes smells, suggesting the damage happens deeper in the brain.
Key Findings
Sublethal doses of permethrin and cypermethrin impaired both habituation (non-associative learning) and olfactory associative learning and memory in honey bees.
Calcium imaging showed cypermethrin did not alter odor signal intensity or the distinctiveness of odor patterns in the antennal lobe (primary smell-processing region), pointing to higher brain centers as the site of cognitive disruption.
Honey bees are responsible for approximately 80% of human crop pollination, meaning cognitive impairment from widely-used pesticides carries significant agricultural and ecological consequences.
chevron_right Technical Summary
Common pyrethroid pesticides — even at doses too low to kill bees — impair honey bees' ability to learn and remember which flowers smell like food, threatening their effectiveness as pollinators.
Abstract Preview
Honey bees are recognized as keystones of terrestrial ecosystems, being responsible for about 80% of human crop pollination. Unfortunately, bee populations have significantly declined over the past...
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