A STUDY ON MATING STRATEGY BASED ON KIN DISCRIMINATION AND REPRODUCTIVE PHYSIOLOGY.

这项研究是一项研究计划的一部分，该计划旨在阐明日本猕猴生殖群体中多只雄性猕猴共存的条件和因素。为此，本研究以灵长类动物研究所开放式围栏内的Wakasa组日本猕猴为主要研究对象，认为多雄猕猴的繁殖条件与其下级雄猴的繁殖成败密切相关。在交配季节采集交配行为和血样，并在婴儿出生后采集血样进行DNA分析。为分析影响雄性适合度的因素，以雄性优势度作为两性竞争的指标。在交配过程中，雌性接近雄性的程度也被作为雄性吸引力(雌性选择)的指标。研究结果表明，雄性生殖成功与雌性选择密切相关，而不是与雄性竞争密切相关。研究发现，雌性选择支持下级雄性参与交配，即形成多个雄性群体。雅库岛的野外研究正在收集粪便和交配行为数据。提高了采集精液采样器的可能性。生理研究结果表明，雄性发情时雌激素水平在100 mg/m以上，射精时雌激素水平在300 mg/m以上。分析了高山县不同种群受精率的年变化，揭示了种群繁殖率的总体趋势。雌性繁殖成功率较高，繁殖率在0.3~0.9之间的雌性占70%。在生殖战略研究和男性生殖成功研究的下一项研究计划中，也应包括女性生殖成功的差异。

This research is a part of a research plan to clarify conditions and factors for the coexistence of plural males in a reproductive group of Japanese macaques. For this purpose the research was planned based on the idea that the condition for multi-male group is greatly related to the reproductive success of subordinate males in the group The main subject animal group was the Wakasa group of Japanese macaques in a open enclosure in Primate Research institute. The data of mating behavior and blood samples of them were collected during mating season and blood samples were collected after the babies were born for the analysis of DNA.To analyze the factor influencing male fitness, male dominance order as an index of male-male competition was investigated. Degrees of female approach to males during the process of mating were also studied as the index of males attractiveness (female choice). The result in the present study showed that the male reproductive success was strongly related to female choice rather than to male competition. The participation of mating by subordinate males, that is formation of multi-male groups was found to be supported by female choice.The field study in Yaku island was under the process in collecting faeces and data on mating behavior. Possibility of collecting sampler of semen was improved.As the result of physiological study, the level of estrogen was found to be more than 100 mg/m as the condition of male estrous and 300 mg/m as the condition of ejaculation.Annual change of fecundity rate in the groups in Takasakiyama was analyzed to reveal the general tendency of reproductive rate in a population. Females reproductive success were found large ; female with fecundity rate from 0.3 to 0.9 were 70% in the population. Variation of female reproductive success should be also included in the next research plan in the study on reproductive strategy as well as of male reproductive success.