Queen ants have a valid explanation for consuming their young.

When a black ant queen notices that her young are sick, she eats them before the disease spreads to other parts of the nest.

Cannibal queens may not win the “Mother of the Year” award, but research suggests this strategy could be an effective way to protect the kingdom. The findings provide insight into the evolution of “filial cannibalism,'' the practice of parents consuming their children.

Ants and other colony-dwelling social insects can prevent the spread of disease by forcing workers to self-isolate when they become sick and by eliminating infected nestmates. These “social immunity” obligations are well known, he writes. Flynn Bizzell and christopher pull at Oxford University. But since the ant queen starts colonies alone, how does she protect herself from disease as she builds and grows her nest?

To find out, Bizell and Puru collected newly mated black ants (Lasius Niger) took the queen to the laboratory. Once the ants had laid eggs and started building nests, the researchers removed the larvae from the queen and exposed some to deadly ant spores. Metahydium A fungus that infects wild ant nests. After a period of time during which these larvae developed a potentially fatal infection, the researchers returned all of the larvae to their mothers, even though they were not yet contagious.

The queen ate 92 percent of the diseased larvae, but only 6 percent of the larvae were uninfected, indicating that the queen was able to detect infection and intervene. Failure to catch the infection can have dire consequences. When the researchers exposed the colonies to the carcasses of highly infectious larvae that had sprouted spore-producing fungi, all the larvae died. And even after spraying the carcasses with an acidic antibacterial toxin, only 20 percent of the queens survived.

Despite these risks, queen bees that feed on infected larvae appear to avoid harm. Researchers suggest that queen bees may be ingesting their own antimicrobial toxins to make their intestines hostile to fungal spores. Based on this conclusion, they Observation of worker ants before they swallow the poison The team then observed the queen bee tending to the openings of her venom glands.

“If the queen gets infected and dies, the colony dies as well,” he says. sebastian stockmeyer She is at the University of Tennessee, Knoxville, as she is the only one with the ability to reproduce. Therefore, it makes sense that evolved strategies to deal with disease would emphasize queen survival.

There are other benefits to eating sick babies as well. The researchers found that queens that ate sick offspring laid 55% more eggs than queens that did not, suggesting that they recycled these caloric resources. The researchers argue that this benefit and the elimination of disease risk could indicate how filial cannibalism evolves in some species.

Joel Meunier Researchers at the University of Tours in France believe that offspring that hatch after their older siblings are eaten may have immune systems that better protect against fungal infections. If so, proving this may reveal the “double benefit” of filial cannibalism for both mother and offspring.

This finding suggests that there is overlap in the behaviors needed to care for young and prevent disease in young colonies. As a result, Bizell and Pule argue that workers' disease prevention behaviors may have evolved from common parental care found in many types of insects.