Japan Long-Term Visit: Reproductive Synchronization of Long-Spined Sea Urchins

该奖项将支持约翰·S博士。皮尔斯大学 加州，圣克鲁斯，与教授合作。山口正志 和冲绳琉球大学的Kiyoshi Yamazato， 京都同志社大学的小林直正， 从1989年3月开始。 他们将研究两个 热带印度-西太平洋海胆属的一种 迪亚德马。 为了研究每月配子发生的节律， 这些节奏与月光和潮汐周期有关， 这些节奏影响这些物种的生育能力，研究人员将 1)确定该物种的每月配子发生节律， 不同的地点; 2）监测种群以检测产卵 事件; 3）将动物保持在人工照明的实验室中 条件，以模拟月光周期和4）试图后方 这两个物种的幼虫，如果可能的话，还包括杂交种，通过变形- 畸形。 该合作项目将为Pearse博士提供访问 分布广泛和生态上重要的成员的日本成分 热带浅水动物群的支持，以及来自 日本实验室和研究人员在提高和 研究这些物种。 由于这些海胆是普遍存在的， 生物侵蚀，并对渔民和游泳者造成滋扰， 了解它们的繁殖模式 可能会产生重要的生态影响。

This award will support Dr. John S. Pearse of the University of California, Santa Cruz, to collaborate with Profs. Masashi Yamaguchi and Kiyoshi Yamazato of the University of the Ryukus, Okinawa, and Naomasa Kobayashi, of Doshisha University, Kyoto, for six months beginning in March, 1989. They will study the development of two tropical Indo-West Pacific species of sea urchins of the genus Diadema. In order to study the monthly gametogenic rhythms and how these rhythms are related to moonlight and tidal cycles, and how these rhythms affect fertility of these species, the researchers will 1) determine the monthly gametogenic rhythms of the species at different locations; 2) monitor populations to detect spawning events; 3) maintain animals in artificially illuminated laboratory conditions to simulate moonlight cycles and 4) attempt to rear the larvae of both species and, if possible, hybrids, through metamor- phosis. This cooperative project will provide Dr. Pearse with access to Japanese components of widespread and ecologically important members of the tropical shallow-water fauna, as well as to support from Japanese laboratories and researchers with experience in raising and studying these species. Since these sea urchins are prevalent, cause bioerosion, and create a nuisance for fishermen and swimmers, further understanding of their reproductive patterns may have important ecological effects.