Researchers of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, have now analyzed the dominance relations between male and female wild bonobos and took particular interest in the high social status ranking of some females.
Bonobo man Jack grooms female Susi in Salonga National Park in the Democratic Republic of the Congo. © Caroline Deimel, LuiKotale Bonobo Project
The result: It is not female alliances that help females win conflicts. The context of the conflict does not seem to be relevant for its outcome either. Instead, the attractiveness of females plays an important role. If females display sexually attractive attributes, including sexual swellings, they win conflicts with males more easily, with the males behaving in a less aggressive way.
While intersexual dominance relations in bonobos never have been thoroughly studied in the wild, several ideas exist of how females attain their dominance status. Some researchers suggest that bonobo female dominance is facilitated by females forming coalitions which suppress male aggression. Others think of an evolutionary scenario in which females prefer non-aggressive males which renders male aggressiveness to a non-adaptive trait.
A recent study by researchers of the LuiKotale bonobo project from the Max Planck Institute for Evolutionary Anthropology reports on the outcomes of intersexual conflicts in a bonobo community near the Salonga National Park in the Democratic Republic of the Congo. Based on the analysis of outcomes of conflicts between the sexes, they found a sex-independent dominance hierarchy with several females occupying top ranks.
Furthermore they discovered that only two factors have a significant influence on the outcome of intersexual conflicts: female motivation to help offspring and attractiveness. That is, whenever females defend their offspring against male aggression, often alone but sometimes in groups, males defer to females. But even more interestingly, females are more likely to win conflicts against males during times when they exhibit sexual swellings indicating elevated fecundity.
Martin Surbeck, first author of the publication, says: “In those situations, males also aggress females less often, which is different from chimpanzees, our other closest living relatives.” The results indicate that in bonobos both female sexuality and male mating strategies are involved in the shifting dominance relationships between the sexes.
ContactDr. Martin Surbeck
Behavioral Ecology and Sociobiology, 9 July 2013, DOI: 10.1007/s00265-013-1584-8
Dr. Martin Surbeck | Max-Planck-Institute
Small but versatile; key players in the marine nitrogen cycle can utilize cyanate and urea
10.12.2018 | Max-Planck-Institut für Marine Mikrobiologie
Carnegie Mellon researchers probe hydrogen bonds using new technique
10.12.2018 | Carnegie Mellon University
What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.
Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...
Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.
Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...
New Project SNAPSTER: Novel luminescent materials by encapsulating phosphorescent metal clusters with organic liquid crystals
Nowadays energy conversion in lighting and optoelectronic devices requires the use of rare earth oxides.
Scientists have discovered the first synthetic material that becomes thicker - at the molecular level - as it is stretched.
Researchers led by Dr Devesh Mistry from the University of Leeds discovered a new non-porous material that has unique and inherent "auxetic" stretching...
Scientists from the Theory Department of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science (CFEL) in Hamburg have shown through theoretical calculations and computer simulations that the force between electrons and lattice distortions in an atomically thin two-dimensional superconductor can be controlled with virtual photons. This could aid the development of new superconductors for energy-saving devices and many other technical applications.
The vacuum is not empty. It may sound like magic to laypeople but it has occupied physicists since the birth of quantum mechanics.
10.12.2018 | Event News
06.12.2018 | Event News
03.12.2018 | Event News
10.12.2018 | Life Sciences
10.12.2018 | Physics and Astronomy
10.12.2018 | Life Sciences