JOURNAL OF PLANKTON RESEARCH | VOLUME 16 | NUMBER 11 | PAGES 1595-1599 | 1994
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Viral mortality in the final stage of Heterosigma akashiwo (Raphidophyceae) red tide
1Department of Fisheries, Faculty of Agriculture, Kinki University Nara 631 2Department of Fisheries, Faculty of Agriculture, Kyoto University Kyoto 606, Japan Red Tide Biology Section, Red Tide Research Division, Nansei National Fisheries Research Institute Ohno-cho, Saeki-gun, Hiroshima 739-04
Received on December 21, 1993; accepted on July 13, 1994 During a bloom of Heterosigma akashiwo (Raphidophyceae) in northern Hiroshima Bay, Japan, in June 1993, the proportion of H.akashiwo cells containing virus-like particles (VLPs) was monitored by transmission electron microscopy. Until 3 days before the termination of the red tide, no VLP-containing cells were detected, and the proportion of VLP-containing cells was <1% on the last 2 days of the red tide. However, the sample collected on the last day, continuously incubated for 26 h at 22°C, revealed a high frequency (11.5%) of VLP-containing cells. These findings suggest that viral mortality occurs in quite a short time and may play an important role in regulating the disintegration of H.akashiwo red tide.
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