Study on sexal-selection and mating success of a subsocial spider mite.

1999年：我进行了行为和形态学观察的Schizotetranychus missizii Saito，其中有亚社会生活。我首先建立了几个形态学特征的S. miscepii反映螨体大小，无论安装方法。然后，我进行了实地调查的男性分布模式的巢，以了解如何在实验条件下观察到的男性男性的攻击真正反映男性在外地的行为。结果表明，米氏圆腹蛛的雄-雄攻击行为与田间雄蛛的巢内聚集模式具有较好的对应关系。此外，这表明，两组具有不同程度的雄性攻击性的米氏中华绒螯蟹是性隔离的，他们被认为是不同的亚种或种。2000年：潜在的男性（即将蜕皮）和实际的男性（成年）的米氏中华绒螯蟹收集在不同的地区，并检查他们的形态。西表种群雄性腿长的频率分布呈双峰型，而本州和九州大部分种群的腿长频率分布呈单峰型，划分了西表种群雄性交配策略的区域。在实验条件下，我可以通过控制食物条件来获得小型和大型成虫。然后对不同体型的雌雄个体的交配成功率进行了评价。结果表明，在24小时交配期内，各组合间的差异不显著。不过，为了知道更准确的结果，我应该继续这个实验，通过缩短交配期在未来。

1999 : I conducted behavioral and morphological observations on Schizotetranychus miscanthi Saito which has subsocial life. I first established several morphological characters of S.miscanthi which reflect mite body size regardless of mounting methods. Then I conducted field surveys on male distribution patters over nests in order to know how the male-male aggressions observed under experimental conditions really reflect male behavior in fields. The result showed that the male-male aggression in S.miscanthi well correspond to the male aggregation pattern per nest in fields. Furthermore, it was revealed that the two groups of S.miscanthi having different levels of male aggression are sexually isolated and they are considered to be different sub-species or species.2000 : The potential males (just before molting) and actual males (adult) of S.miscanthi were collected in various districts and inspected their morphology. The male leg I length of Iriomote population showed bimodal frequency distribution, though it showed uni-modal distribution in most populations of Honshu and Kyushu Islands, seggesting division of male mating tactic in Iriomote population. Under experimental conditions, I could get small and large adults by controlling food conditions. Then the mating success of males and females having different body size was evaluated. The result showed that there is no significant difference among all combinations during 24 hr mating period. However, in order to know more precise result, I should continue this experiment by shortening the mating period in the future.