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JPR Advance Access published online on November 25, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi106
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©The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received July 23, 2005
Accepted November 21, 2005

Article

Seasonal change of dinoflagellates cyst flux collected in a sediment trap in Omura Bay, West Japan

Rika Fujii 1 and Kazumi Matsuoka 2 *

1 Graduate School of Science and Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
2 Institute for East China Sea Research, Nagasaki University, 1551-7 Taira-cho, Nagasaki 851-2213, Japan

* To whom correspondence should be addressed.
Kazumi Matsuoka, E-mail: kazu-mtk{at}net.nagasaki-u.ac.jp


  Abstract

Sediment trap samples were harvested bimonthly from 1998 to 2000 and examined to better understand the species composition and seasonal variation of dinoflagellate cyst flux in Omura Bay in Japan. Samples living cyst flux clearly showed seasonal variation with the higher flux number between autumn and winter. In total, 43 different cyst taxa were recorded and these were composed of two different ecological groups. The first group included Protoperidinium compressum and P. subinerme, which increased every autumn to winter. The second group included Gonyaulax spp. and Pheopolykrikos hartmannii, and was trapped throughout the year. These two groups manifested the different flux patterns, and were respectively heterotrophic and autotrophic in nutrition. In the heterotrophic group, protoperidinioid cysts were dominant. Vegetative cells of protoperidinioid are known to feed mainly diatoms. Sample diatom flux also increased autumn to winter. Therefore, the increase of protoperidinioid cysts in autumn to winter was observed to correlate with diatom blooms. In contrast, the autotrophic group mostly consisting of Gonyaulacoid cysts and were generally observed throughout the year, although occurrence varied between species most likely responding to favorable environmental conditions. The results indicate that cyst production is closely related to different nutritional modes.

Communicating Editor: KJ Flynn


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