Viral impacts on total abundance and clonal composition of the harmful bloom-form phytoplankton Heterosigma akashiwo

Article Abstract:

Viruses control the composition and clonality of phytoplankton, according to a study of the harmful bloom-forming phytoplankton Heterosigma akashiwo and its associated virus, HaV. An increase in viral levels resulted in a decrease in phytoplankton cell density. However, some cells survived and demonstrated resistance to the virus.

Water bloom, Algal blooms, Viruses, Phytoplankton

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Growth characteristics and itraspecies host specificity of a large virus infecting the dinoflagellate Heterocapsa circularisquama

Article Abstract:

Research has been conducted on Heterocapsa circularisquama virus. The authors have examined the growth characteristics and intraspecies host specificity of this virus via the study of interactions between the virus and H. circularisquama, and have described the results.

Japan, Science & research, Causes of, Physiological aspects, Genetic aspects, Virus diseases, Microbiology, Dinoflagellates, Company growth, Microbial ecology

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Growth characteristics of Heterosigma akashiwo virus and its possible use as a microbiological agent for red tide control

Article Abstract:

The growth characteristics of Heterosigma akashiwo virus (HaV) and its algicidal properties have been examined by performing a one-step growth experiment. HaV is a large DNA virus that infects Heterosigma akashiwo, one of the algae species that causes red tide. It has a latent period of 30 to 33 hours and a burst size of 7.7 x 10 raised to the second power lysis-causing units in an infected cell. Results indicated that the growth of H. akashiwo is inhibited when the HaV01 clone is administered into a mixed algal culture with four phytoplankton species. Similar results were obtained when a natural seawater sample was used.

Prevention, Control, Red tide, Red tides, Marine algae, DNA viruses

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