For Paper Wasps, Being Unique Has its Benefits

For paper wasps, it pays to have a unique face. That's what Michael Sheehan and Elizabeth Tibbetts of University of Michigan concluded in a recent paper published in the journal Evolution. Their research reveals that paper wasps (Polistes fuscatus) that have distinct facial markings become embroiled fewer aggressive conflicts than those that had facial markings that made them less easily distinguished from fellow wasps.

"It's good to be different, to wear a name tag advertising your identity," said Michael Sheehan.

In previous research, Elizabeth Tibbetts showed that paper wasps are able to recognize each other based on their distinct facial markings. Now, this latest research reveals just how a unique face can help an individual wasps by enabling it to avoid unnecessary confrontations with other wasps.

Tibbets and Sheehan set up experiments in which they modified the facial patterns of wasps and evaluated the aggressive behavior among individuals in the group. Each group had three wasps whose faces they modified to look similar as well as a fourth wasp whose facial markings were distinct from the other three. Tibbets and Sheehan observed that the wasps that were recognizable—those with the unique facial marking—experienced less aggression than those with less distinct markings. They reasoned that if an individual is reconginzed, repeated aggression is not ncessary as previous social interactions have already settled the question of social status.

Photo © Michael Sheehan / University of Michigan.