Furuichi Takeshi, Hashimoto Chie
Faculty of International Studies, Meiji-Gakuin University, Totsuka, Yokohama 244-8539, Japan.
Primates. 2004 Jan;45(1):59-62. doi: 10.1007/s10329-003-0055-7. Epub 2003 Sep 19.
We examined sex differences in copulation attempts in a group of wild bonobos at Wamba, Congo, by analyzing the behavioral sequence. Most copulation attempts were initiated by approach or courtship behaviors by males. Males showed these behaviors when they were more than 5 m from females, whereas females did so only when males solicited them from within 5 m. Most copulations involved females showing perineal swelling, because males solicited those females more frequently and those females accepted copulation more frequently than did females in the non-swelling phase. Nevertheless, males solicited females in the non-swelling phase in one-third of copulation attempts, and those females accepted copulation in half of those attempts. This is markedly different from chimpanzees, in which sexual behaviors almost exclusively involve females in the swelling phase. The perineum of female bonobos during the non-swelling phase is soft and wrinkled but fairly large, which may attract males to some extent. The low, but existing, attractiveness and receptivity of female bonobos during the non-swelling phase might have evolved to control sexual competition among males and provide higher social status for females.
我们通过分析行为序列，研究了刚果万巴一群野生倭黑猩猩交配尝试中的性别差异。大多数交配尝试由雄性的接近或求偶行为发起。当雄性与雌性距离超过5米时，雄性会表现出这些行为，而雌性只有在雄性在5米内主动求偶时才会如此。大多数交配中雌性会出现会阴肿胀，因为雄性更频繁地向这些雌性求偶，且这些雌性比非肿胀期的雌性更频繁地接受交配。然而，在三分之一的交配尝试中，雄性会向非肿胀期的雌性求偶，而这些雌性中有一半会接受交配。这与黑猩猩明显不同，在黑猩猩中，性行为几乎只涉及处于肿胀期的雌性。非肿胀期雌性倭黑猩猩的会阴柔软且有褶皱，但相当大，这可能在一定程度上吸引雄性。非肿胀期雌性倭黑猩猩较低但存在的吸引力和接受度可能已经进化，以控制雄性之间的性竞争，并为雌性提供更高的社会地位。
