Evolution of mate choice behavior and its cognitive mechanism.

a)孔雀研究：在静冈县伊豆仙人掌公园进行了孔雀交配行为的实地研究。我们测量了1)雄性的交配成功率；交配次数和交配行为；2)雄性第二性征；眼斑数及其不对称性；3)肠道寄生虫；线虫卵和原生动物卵母细胞的数目。结果表明，眼斑波动不对称性与雄性交配成功率和雄性寄生虫抗性呈负相关。眼点的数量本身与交配成功率无关。雌性在交配前拜访了几个雄性，雄性不强迫与雌性交配，雌性似乎选择了更健康的配偶。我们在诺丁汉的国际行为生态学会议和大阪的日本行为学会会议上发表了这些结果。b)人类研究：我们通过文献研究人类的择偶行为。长谷川先生将这一领域的两本有影响力的英文著作翻译成了日文：海伦娜·克罗宁的《蚂蚁和孔雀：从达尔文到今天的利他主义和性选择》（剑桥大学出版社，1991年）和马特·里德利的《红皇后：性和人性的进化》。（维京，企鹅出版社，1993）。她还通过日本报纸和杂志撰写有关人性和性行为的文章。

a) Peafowl study : Field study of peafowl mating behavior was conducted in Izu Cactus Park, Shizuoka Prefecture. We measured 1) male mating success ; number of copulation and hoot-dush behavior, 2) males' secondary sexual traits ; number of eye-spots and its asymmetry, and 3) intestinal parasite ; number of nematode eggs and protozoa oocytes. In results, fluctuating asymmetry (FA) in eye-spots negatively correlate with male mating success and with male parasite resistance. Number of eye-spots itself did not correlate with mating success. As females visited several males before copulation and male did not force to copulate with females, females seemed to choose healthier mates using FA indicator. We presented these results at International Behavioral Ecology Meeting, Nottingham, and Japan Ethological Society Meeting, Osaka.b) Human study : We investigate human mate choice behavior through literature. M.Hasegawa translated two influential English books of the area into Japanese : Helena Cronin "The ants and the peacocks : Altruism and sexual selection from Darwin to today" (Cambridge Univ.Press, 1991) and Matt Ridley "The red queen : Sex and the evolution of human nature." (Viking, Penguin, 1993) . She also contributes articles on human nature and sexual behavior through Japanese newspapers and magazines.