Research helps understand group relationships in gorillas

A study by researchers from The University of Western Australia has found that the behaviour between groups of African mountain gorillas is very much influenced by the strong, life-long bonds they form with members of their group.

Credit: University of Western Australia

Published in Animal Behaviour, the research also found that conflict is far more likely to involve alpha male gorillas who are the leaders and protectors of their group. The researchers observed interactions between 10 groups of mountain gorillas in Rwanda over a one-year period and combined their observations with data collected by the Karisoke Research Center (Dian Fossey Gorilla Fund International) between 2003 and 2015.

They found male gorillas engaged in aggressive fights to protect the members in their group. However, the bonds formed between former group members living in different groups dramatically reduced hostility upon reunion, and sometimes promoted gorillas to exchange affiliative behaviours, such as playing and grooming.

Lead researcher Dr. Melanie Mirville, from UWA's School of Anatomy, Physiology and Human Biology, said the bonds formed between gorillas were so strong that interactions between these particular groups were usually peaceful, even after years of separation.

Credit: University of Western Australia

"What's interesting is people often have the perception that gorilla behaviour is very much influenced by competition for females or over a food source, but there's also a good proportion of behaviour that is peaceful as a result of long-lasting social relationships," Dr. Mirville said.

Dr. Mirville said the research showed similarities to social interaction in humans.

"As humans we are friendlier if we bump into someone we know in comparison to people we don't know or trust," she said. "We also have an ongoing history of conflict and war, alliances and peace-making.