Thaindian News

Washington, Mar 19 (ANI): Researchers have debunked a puzzling example of altruism in nature by showing that purple-crowned fairy wrens are in reality cunningly planning for their own future when they assist in raising other birds’ young by balancing the amount of assistance they give with the benefits they expect to receive in the future.

Anne Peters, of the Monash University School of Biological Sciences, together with co-authors Sjouke Kingma from the Max Planck Institute for Ornithology and Michelle L. Hall of the Australian National University, have conducted a long-term study of the cooperative breeding behaviour of fairy-wrens in tropical Australia.

The results have shown that the helpers are not motivated by kindness.

“The study showed that the seemingly selfless little helpers are in fact carefully calculating accountants,” said Peters, senior author of the study.

Cooperative breeding, where birds apparently selflessly raise others’ offspring, has long perplexed biologists as this behaviour runs counter to Darwin’s theory of natural selection, which predicts that individuals invest only in their own reproduction.

Fairy-wrens are habitual cooperative breeders. The helpers are generally older silblings or half-siblings of the current nestlings, and their behaviour is likely explained by an instinctive desire to see more of their shared genes entering the gene pool.

Purple-crowned fairy-wrens extend this assistance to unrelated nestlings.

Peters’ study has shown that these apparently altruistic helpers are actually playing a selfish game: they help when their chances of inheriting the current breeding territory are greater, and they are thus helping to raise their own future assistants.

The findings have been published in the journal The American Naturalist. (ANI)