Female chimps' reproductive success decreases in times of strong territorial conflict. Territorial conflicts can turn violent in humans and chimpanzees, two extremely territorial species. An international team of researchers has studied the effects of territoriality on female reproductive success in wild Western chimpanzees and found that high neighbor pressure at times when females typically reproduce can lead to reproductive delays with longer intervals between births. Having many males in a group, however, is of advantage and speeds up reproduction. Source 7o.
In chimpanzees, females contribute to the protection of the territory. Researchers have extensively studied several neighboring groups of western chimpanzees and their findings reveal that females and even the entire group may play a more important role in between-group competition than previously thought. They found that even though adult males seem important in territory increase, territory maintenance and competitive advantage over neighbors act through the entire group in this population of chimpanzees in the Taï National Park. Source 4s.