In a new study printed within the journal Royal Society Open Science, buff-tailed bumblebees (Bombus terrestris) uncovered to a brood-killing fungus shifted their foraging habits towards nectar laced with a pure antimicrobial compound, providing a uncommon glimpse of habits in keeping with self-medication in a social insect.
Debeuckelaere et al. used robotic flowers to check the speculation that bumblebees (Bombus terrestris) modify nectar selection after pathogen publicity, specializing in quercetin, a standard nectar secondary compound with antimicrobial exercise. Picture credit score: Josef Pichler.
“The sector of zoopharmacognosy examines how animals use natural compounds for medicinal purposes, akin to assuaging ache, preventing infections, or defending in opposition to parasites,” stated Dr. María Pozo from the College of Valladolid and her colleagues from KU Leuven in Belgium.
“A central habits inside this area is self-medication, which refers back to the potential of an organism to eat natural compounds that halt or cut back a present an infection or stop one, regardless of such compounds being pricey to wholesome people.”
“This habits represents a type of adaptive plasticity, whereby people modify their food regimen in response to pathogen stress.”
“As a result of medicinal compounds are sometimes poisonous or nutritionally suboptimal, self-medication is predicted to happen primarily when people are contaminated, whereas wholesome people ought to keep away from such compounds.”
“On this research, we examine whether or not the social bee Bombus terrestris engages in self-medication habits when uncovered to pathogens.”
Within the research, the authors used robotic flowers to trace how bumblebee colonies selected between plain sugar nectar and nectar spiked with quercetin, a flavanol with documented anti-microbial exercise in opposition to a broad vary of Gram-positive and Gram-negative micro organism, in addition to fungi and viruses.
Colonies had been both stored wholesome or uncovered to one in every of two pathogens: the fungus Ascosphaera apis, which causes chalkbrood illness in bee larvae, or the bacterium Serratia marcescens, which infects grownup bees’ guts.
Over 5 days of free foraging, colonies challenged with the fungus elevated each their visits to the quercetin-laced flowers and the time spent feeding there because the experiment progressed.
Wholesome colonies confirmed no such shift, and colonies uncovered to the bacterium didn’t change their preferences both.
The researchers counsel this sample could mirror the alternative ways the 2 pathogens have an effect on a colony.
As a result of chalkbrood primarily harms bee larvae quite than the foraging adults themselves, the elevated curiosity in quercetin amongst fungus-exposed colonies could symbolize social treatment, wherein employee bees collect compounds that profit the brood quite than themselves.
Serratia marcescens, against this, primarily impacts grownup foragers immediately, and any medicinal profit from quercetin in opposition to it could possible be much less direct, probably explaining why no shift was noticed.
“These outcomes point out that pathogen identification shapes behavioral plasticity in nectar foraging and exhibit the worth of robotic flowers for finding out adaptive foraging responses to pathogens,” the scientists concluded.
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Kamiel Debeuckelaere et al. 2026. Hints of self-medication? Pathogen exposure-dependent foraging choices of bumblebees. R. Soc. Open Sci 13 (8): rsos260777; doi: 10.1098/rsos.260777
