2000 Fiscal Year Final Research Report Summary

DINOFLAGELLATE SUCCESSION MECHANISMIN BLACKISH WATERS

Research Project

Project/Area Number	10640454
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Stratigraphy/Paleontology
Research Institution	OSAKA INSTITUTE OF TECHNOLOGY
Principal Investigator	KOJIMA Natsuhiko OSAKAINTITUTE OF TECHNOLOGY, DEPT.OF TECHNOLOGY, ASSOCIATE PROFESSOR, 工学部, 助教授 (90288754)
Project Period (FY)	1998 – 2000
Keywords	DINOFLAGELLATE / BLACKSH WATER / CYST / LAKE NAKAUMI / AUTOTROPHIC SPECIES / GERMINATION / 中海 / 独立栄養種
Research Abstract	Dinoflagellate assemblage research, water analysis and cyst germination experiment were done during two years in Lake Nakaumi, (blackish water lake), west Japan. 37 dinoflgellate species are recorded and their characteristics of seasonal appearance are also confirmed. The assemblage are composed of three main groups, Prorocentrum minimum, Heterocapsa rotundata and small Gymnodinium complex. They are appeared all year round. These results and the tenndency of dinoflagellate regional appearance in the lake indicate that no-cyst forming autotrophic dinoflagellate is adapted in blackish water and become dominant speceies. The fact shows these dinoflagellate are adapted in intense environmental change. These evedence explain that no-cyst forming autotrophic dinoflagellate is dominance in balacksh water condition, but cyst-foming species is not always adapted in the environment.