Relationship between occurrence of the mixotrophic dinoflagellates and its prey organism in natural seawater

2015 Fiscal Year Final Research Report

• Project/Area Number: 25450256
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Aquatic bioproduction science
• Research Institution: Mie University
• Principal Investigator: ISHIKAWA AKIRA 三重大学, 生物資源学研究科, 教授 (00273350)
• Co-Investigator(Renkei-kenkyūsha): NISHITANI GOH 東北大学, 大学院農学研究科, 助教 (70450781)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 有毒渦鞭毛藻 / Dinophysis 属 / 餌生物 / 繊毛虫

Outline of Final Research Achievements

Gene analyses in the food vacuoles of the natural cells of D. acuminata collected from an enclosed port located at Ise Bay, central Japan, were pioneered in this study. From the gene evidences, M. rubrum was revealed as prey item. Water sampling was also conducted weekly or biweekly at the port from March 2012 to July 2015. The water samples were preserved with Bouin’s solution and both organisms (D. acuminate and M. rubrum) were enumerated under a microscope. The temporal changes in the abundances of both organisms often displayed the dynamics in which D. acuminata was flourished after the increase of M. rubrum and vice versa, indicating their prey-predator relationship in nature. In this study, prey organisms and prey-predator relationship for the toxic dinoflagellate D. rotundata were also revealed in nature.

Free Research Field

浮遊生物学