Ecological studies on habitat segregation and character displacement in sympatric species.

近缘物种的同域分布需要某种机制来避免生殖干扰的风险。同域分布的中肋Mnais costalis和M.从2011年到2013年，在日本各地的一条低山溪中研究了pruinosa豆娘。这两个物种的繁殖季节几乎完全重叠：这两个物种出现在5月初，每年6月下旬消失。这两个物种的男性持有领土在同一河段的河流，但两个物种表现出一些不同的栖息地偏好导致栖息地隔离的方式，M。costalis在下游的数量较多，而M.粉霜藻在上游的数量较多。我们进行了生理和生态研究的各种特征，显示字符位移（翅色多态性，身体大小，栖息地偏好），以及它们是如何与栖息地隔离和物种识别。

Sympatric distribution of closely related species requires some mechanism to avoid the risk of reproductive interference. Distribution and abundance of sympatric Mnais costalis and M. pruinosa damselflies were studied in a low mountain stream in various locations in Japan, from 2011 through 2013. The reproductive seasons of the two species overlapped almost entirely: both species emerged in early May and disappeared in late June each year. Males of both species hold territories within the same stretch of the river; however, two species show some difference in habitat preference leading to the habitat segregation in a way that M. costalis was more abundant on the lower stream, while M. pruinosa was more abundant on the upper stream. We made physiological and ecological studies on various traits which show character displacements (wing-color polymorphism, body size, and habitat preference) and how they are related to habitat segregation and species recognition.