Group evolutionary biologists from the Max Planck Institute in Leipzig, discovered that female bonobos bonobos probably began to dominate males, deceiving them about his readiness to become pregnant. The results are presented in BMC Evolutionary Biology journal and briefly reported by RNS.
Researchers at the Max Planck Institute for Evolutionary Anthropology (Max-Planck -Institut für evolutionäre Anthropologie) for three years was observed in 13 females bonobos bonobo (Pan paniscus) , living in the wild in the Republic of Congo. These observations showed that the appearance of the genitalia of female bonobos in many cases does not give any precise information about the stage of the sexual cycle in which they are located. This phenomenon is called ovulation hidden, and previously in bonobos were not observed.
The moment of ovulation in dwarf chimpanzees was determined by measuring their urinary levels of sex hormones. In addition, the researchers evaluated the size of the external genitalia of female bonobos and celebrated the days when this was the maximum size. Theoretically, the swelling of the labia should be observed only during ovulation. However, research has shown that the sex organs female chimpanzees can be increased almost at any time. Only half the time of the swelling of the labia coincide with the real time of oocyte maturation. In some cases, the vulva remained increased sizes consecutive month. Apparently, this phenomenon is needed to reduce aggression between males bonobos, as it makes sense only if you know exactly when the female is ready to breed them, competition for females.
Sexual acts are needed when they are may give rise to progeny. In appearance, females of many animals is easy to determine whether they are ready to mate – that is, whether they have occurred ovulation. However, there are some exceptions, including the representatives of our species. Buttocks and breasts in women constantly increased, and their size is impossible to know whether the egg is matured. According to one theory, it is thanks to the hidden ovulation people began to form permanent (monogamous) couple. The man was forced to reside next to his woman, so as not to miss a moment of oocyte maturation. Accordingly, the time for mating with the other he had no
Bonobos, on the other hand, are paired with almost all representatives of its kind, which know -. And at the same time, according to a new study of the female also hide the time of ovulation. Thus, it is likely that hidden ovulation has not contributed to the emergence of understanding in relations among human ancestors, but could reduce the level of aggression within each individual tribe.
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