Science News
from research organizations

'Big mama' bonobos help younger females stand up for themselves

Female bonobo coalitions more easily defeat aggressive males

Date:
July 19, 2016
Source:
Kyoto University
Summary:
Bullying happens in the primate world too, but for young bonobo females, big mama comes to the rescue. Kyoto University primatologists report that bonobo females frequently aid younger females when males behave aggressively towards them. This partly explains how females maintain a superior status in bonobo society.
Share:
FULL STORY

Bonobos.
Credit: © Pascal Martin / Fotolia

Bullying happens in the primate world too, but for young bonobo females, big mama comes to the rescue. Japanese primatologists report in Animal Behaviour that older bonobo females frequently aid younger females when males behave aggressively towards them.

"We may have uncovered one of the ways in which females maintain a superior status in bonobo society," says lead author Nahoko Tokuyama of Kyoto University.

In their study, Tokuyama and fellow researcher Takeshi Furuichi observed a group of wild bonobos at Wamba, Democratic Republic of the Congo.

"Primate females sometimes forge partnerships to attack others. Typically, such coalitions are formed between relatives to protect useful resources from non-relatives." says Tokuyama. "For bonobos, females leave their birth group during adolescence, so females in a group are generally non-relative to each other. Despite this, they frequently form coalitions; a major research goal for us was to highlight the dynamics in which coalition-forming happens in non-relative individuals."

Through four years of observation they found that all female coalitions were formed to attack males, usually after males behaved aggressively toward one or more females. They also found that older females have better chances of winning when the battle is one-one-one, and when females form alliances they always win over males. What's more, the older females don't play favorites; whether a younger female is friendlier with the older female has no relation to whether the older female comes to help.

Tokuyama observes that coalition-forming in female bonobos may have evolved as a way to combat male harassment. "Young females have a lower social status than males, but protection from older females seem to let young females join the group without fear of being attacked by males. By controlling aggression by males in this manner, females maintain overall superiority in the social hierarchy.

"It's beneficial for the older females as well, because the younger females start spending more time with them in hopes of getting protection. This way, the older female can give her son more opportunities to mate with the younger females. Such partnerships might in fact be the very factor that fosters gregariousness and promotes tolerance among females."


Story Source:

Materials provided by Kyoto University. Note: Content may be edited for style and length.


Journal Reference:

  1. Nahoko Tokuyama and Takeshi Furuichi. Do friends help each other? Patterns of female coalition formation in wild bonobos at Wamba. Animal Behaviour, 2016 DOI: 10.1016/j.anbehav.2016.06.021

Cite This Page:

Kyoto University. "'Big mama' bonobos help younger females stand up for themselves: Female bonobo coalitions more easily defeat aggressive males." ScienceDaily. ScienceDaily, 19 July 2016. <www.sciencedaily.com/releases/2016/07/160719105718.htm>.
Kyoto University. (2016, July 19). 'Big mama' bonobos help younger females stand up for themselves: Female bonobo coalitions more easily defeat aggressive males. ScienceDaily. Retrieved May 24, 2017 from www.sciencedaily.com/releases/2016/07/160719105718.htm
Kyoto University. "'Big mama' bonobos help younger females stand up for themselves: Female bonobo coalitions more easily defeat aggressive males." ScienceDaily. www.sciencedaily.com/releases/2016/07/160719105718.htm (accessed May 24, 2017).

RELATED STORIES