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JPR Advance Access published online on March 7, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi006
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received October 16, 2004
Accepted February 18, 2005

Horizons

Temporal changes in the ciliate assemblage and consecutive estimates of their grazing effect during the course of a Heterocapsa circularisquama bloom

Takashi Kamiyama 1* and Yukihiko Matsuyama 2

1 Tohoku National Fisheries Research Institute, Fisheries Research Agency, Shinhama, Shiogama, Miyagi 985-0001, Japan and
2 National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Maruishi, Ohno, Saeki, Hiroshima 739-0452, Japan

* To whom correspondence should be addressed.
Takashi Kamiyama, E-mail: kamiyama{at}affrc.go.jp


  Abstract

Temporal changes in ciliate assemblages during the course of a bloom of the harmful microalga Heterocapsa circularisquama (Dinophyceae) were investigated and consecutive estimates of species-specific maximum grazing losses were analyzed for August to September 1998 at a site in western Hiroshima Bay, the Seto Inland Sea of Japan. Temporal increases of the H. circularisquama mean concentration in the water column were observed twice (25-29 August and 7-10 September) with the maximum concentration (ca. 4000 cells mL-1) being recorded on 25 August. The main ciliate genera during the bloom were Favella, Tontonia, Eutintinnus, Tintinnopsis and Amphorellopsis. Increases of Favella and Tontonia were observed when the concentration of H. circularisquama ranged from 260 to 1170 cells mL-1. Total maximum grazing loss estimated from the abundance and ingestion rate of each ciliate species on H. circularisquama ranged from 1 to 75% standing stock removed d-1 of the H. circularisquama concentration. High grazing losses mainly due to the genera Favella and Tontonia occurred during the period when the H. circularisquama concentration was decreasing. These results suggest that grazing by ciliate assemblages can influence the population dynamics of H. circularisquama despite the potentially toxic nature of the phytoplankter.


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