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The benefits of social grooming
Date:1/23/2013

ial interactions like mutual grooming in a group of wild chimpanzees from Budongo Forest in Uganda and non-invasively collected urine samples of the 33 female and male adult group members on plastic bags or leaves. They determined the level of the hormone oxytocin before and shortly after the animals had been grooming with each other and found that oxytocin levels were especially high in chimpanzees who had been grooming with a "bond partner", a cooperation partner, irrespective of whether this bond partner happened to be their kin or not. On the other hand, the level of urinary oxytocin was much lower in chimpanzees who had been grooming with a "non-bond partner", with whom they did not share a cooperative relationship, or in animals who had not been grooming at all. Furthermore, the researchers found that the animal's sex or age, grooming duration and other factors did not have a significant influence on urinary oxytocin levels.

"Our results demonstrate that a rise in oxytocin was dependent upon the combined effects of social grooming with a bond partner", says Catherine Crockford of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany. "Crucially, oxytocin levels were similarly high after grooming with non-kin and kin bond partners. This suggests that, in chimpanzees, oxytocin plays a key role in maintaining social relations beyond immediate genetic ties".

"This is the first study that measures the levels of the hormone oxytocin on wild animals in a non-invasive way", says Roman Wittig of the Max Planck Institute for Evolutionary Anthropology. "We have developed a tool with which cross-species comparisons that link underlying physiology and behavior can eventually be made of social mammals in their natural environment". In future field research this tool will be used to compare single behaviors like other cooperative or aggressive behaviorsby measuring how they differ from each other hormonally.


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Contact: Catherine Crockford
crockford@eva.mpg.de
49-034-135-50220
Max-Planck-Gesellschaft
Source:Eurekalert  

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