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AME 17:91-98 (1999)
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Abstract
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Grazing impacts of the heterotrophic dinoflagellate Polykrikos kofoidii on a bloom of Gymnodinium catenatum
Yukihiko Matsuyama1,*, Masahide Miyamoto2, Yuichi Kotani1
1National Research Institute of Fisheries and Environment of Inland Sea, Maruishi, Ohno, Saeki, Hiroshima 739-0452, Japan
2Kumamoto Ariake Fisheries Direction Office, Iwasaki, Tamana, Kumamoto 865-0016, Japan
*E-mail: yukihiko@nnf.affrc.go.jp
ABSTRACT: In 1998, a red tide of the paralytic shellfish poisoning (PSP)-producing dinoflagellate Gymnodinium catenatum Graham occurred in Yatsushiro Sea, western Japan. The dramatic decline of dominant G. catenatum cells occurred during the
field and laboratory assessments, accompanied with growth of the heterotrophic dinoflagellate Polykrikos kofoidii Chatton. Microscopic observations on both field and laboratory cultured bloom water revealed that >50% of P. kofoidii
predated on the natural population of G. catenatum, and 1 to 8 G. catenatum cells were found in food vacuoles of P. kofoidii pseudocolonies. Our results suggest that predation by P. kofoidii contributes to the cessation
of a G. catenatum bloom.
KEY WORDS: PSP · Gymnodinium catenatum · Polykrikos kofoidii · Harmful algal bloom · Predation · Heterotrophic dinoflagellate
Published in AME Vol.
17, No. 1
(1999) on April 30
ISSN: 0948-3055.
Copyright © Inter-Research, Oldendorf/Luhe, 1999
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