Studies on Distribution and Biology of Indo-Pacific bottlenose dolphins (Tursiops aduncus) around Japan

为保护日本周边的印度太平洋短吻海豚，对该种群的分布、种群间的遗传关系、行为和生殖生理进行了研究。在日本首次报道该物种的奄美群岛地区，50多只海豚通过基于船只的调查进行了照片鉴定。在鸟岛周围发现了一个种群，首次在东京发现，并且与Mikura和小笠原种群有遗传关系。三仓岛附近野生海豚的社会行为频率因性别和发育阶段而异。雄性生殖活动在春秋季较高。

Distribution, genetic relationship among local populations, behavior and reproductive physiology were studied for the conservation of Indo-Pacific bottlenose dolphins around Japan. In Amami Is.area where the species was first reported in Japan, more than 50 dolphins were photo-identified by boat-based surveys. A population was found around Torishima Is., Tokyo for the first time and it is genetically related to Mikura and Ogasawara populations. Frequency of social behaviors of the wild dolphins around Mikura Is.varied with sex and developmental stage. Male reproductive activity was higher in spring to fall seasons.