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

基于亲属歧视和生殖生理学的交配策略研究。

基本信息

批准号：
06640816
负责人：
OHSAWA Hideyuki
金额：
$ 0.9万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

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.

本研究是一项研究计划的一部分，以澄清条件和因素的多个男性共存的生殖组的日本猕猴。为此，本研究计划基于多雄性群体的条件与群体中从属雄性的繁殖成功有很大关系的想法。主要受试动物群体是灵长类研究所开放围栏中的日本猕猴Wakasa群体。在交配季节采集交配行为资料和血样，在仔鼠出生后采集血样进行DNA分析，并以雄性优势序作为雄鼠竞争的指标，分析影响雄鼠适合度的因素。在交配过程中，雌性接近雄性的程度也被研究作为雄性吸引力（雌性选择）的指标。研究结果表明，雄性的繁殖成功与雌性的选择密切相关，而与雄性的竞争无关。雌性选择支持了次级雄性参与交配，即多雄性群体的形成。通过对高崎山雀的生理学研究，发现雄性发情时雌激素水平大于100 mg/m2，射精时雌激素水平大于300 mg/m2，分析了高崎山雀种群繁殖率的年变化，揭示了种群繁殖率的一般趋势。雌虫的繁殖成功率较高，繁殖率在0.3 ~ 0.9之间的雌虫占70%。在生殖策略的研究中，雌性生殖成功的变异与雄性生殖成功的变异一样，也应列入下一步的研究计划。