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Sibling cooperation in earwig families gives clues to early evolution of social behavior
Date:4/15/2014

Looking at the question of how social behavior has developed over the course of evolution, scientists from the universities in Mainz and Basel have gained new insights from the study of earwigs. "Young earwig offspring don't simply compete for food. Rather the siblings share what is available amongst themselves, especially when the mother is absent," explained Dr. Jol Meunier of the Evolutionary Biology section of the Institute of Zoology at Johannes Gutenberg University of Mainz (JGU). The team of biologists from Mainz University and the University of Basel investigated the interactions between siblings of the European earwig (Forficula auricularia). To date, insects have been only little studied with regard to cooperative behavior between siblings, except in the case of eusocial species, such as bees and ants. The European earwig provides, as the research project shows, valuable clues to the origins of social behavior patterns.

The animal kingdom has an unbelievable diversity of forms of social life. These encompass situations such as the temporary aggregation of single individuals to social communities based on the division of labor. For evolutionary biologists this poses question of how these ubiquitous social life forms emerged despite the accompanying disadvantages of competition and conflict among group members. When it comes to birds, for example, the competition among siblings is often so fierce that some of the younger animals die.

"In the case of earwigs, we have a system that closely resembles the primitive conditions of family life," said Jos Kramer, a doctoral candidate on Meunier's team. In fall, female earwigs lay on average 40 to 45 eggs and stay over the winter with them. The mothers watch the eggs, keep them clean by licking off fungi, for example, and carry them back and forth in the nest. Once the young, the so-called nymphs, emerge, they stay in the nest for few weeks with their mothers, even if the presence of thi
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Contact: Dr. Joël Meunier
meunier@uni-mainz.de
49-613-139-27852
Johannes Gutenberg Universitaet Mainz
Source:Eurekalert  

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