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Aquatic Microbial Ecology

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AME 63:223-230 (2011)  -  DOI:

Dynamics of diatom viruses on the western coast of Japan

Yuji Tomaru1,*, Naoki Fujii2, Shigeyuki Oda3, Kensuke Toyoda1, 4, Keizo Nagasaki1

1National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, 2-17-5 Maruishi, Hatsukaichi, Hiroshima 739-0452, Japan
2Fukuoka Fisheries and Marine Technology Research Center Ariakekai Laboratory, 728-5 Yoshitomi, Yanagawa, Fukuoka 832-0055, Japan
3Fukuoka Fisheries and Marine Technology Research Center Buzenkai Laboratory, 76-30 Unoshima, Buzen, Fukuoka 828-0022, Japan
4Department of Botany, Keio University, 4-1-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8521, Japan

ABSTRACT: Diatoms are prominent primary producers that play an important role in global carbon cycles. Diatom dynamics are, therefore, important for biogeochemistry, fisheries and earth science. Viral infection is now assumed to be one of the most significant factors affecting diatom dynamics. However, few studies, based on practical field data, have focused on the relationship between diatoms and viruses in natural waters. To elucidate on this relationship, we assessed the temporal change in the abundance of diatoms and their viruses on the western coast of Japan from 2004 to 2009. Three species of diatoms were used as hosts to enumerate viruses in water and sediment samples: Chaetoceros debilis, C. tenuissimus and C. salsugineum. Diatom viruses in the water column rapidly increased during C. debilis and C. tenuissimus blooms, maintaining a high abundance throughout the blooming period. These data suggest the potential importance of viruses in controlling the population dynamics of diatoms in natural environments. The number of viruses in sediments fluctuated considerably, even during non-blooming periods, which suggests that virus-infected diatom cells were supplied to the sediments from water-column populations throughout the year. This process might be an important strategy to reduce the impact of viruses on diatom populations. Because diatom populations are thought to have an intimate relationship with their viruses in natural waters, further studies of diatom dynamics should include the effects of viral infections.

KEY WORDS: Diatom · Population dynamics · Virus · Chaetoceros · Sediment · Bloom · Survival strategy

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Cite this article as: Tomaru Y, Fujii N, Oda S, Toyoda K, Nagasaki K (2011) Dynamics of diatom viruses on the western coast of Japan. Aquat Microb Ecol 63:223-230.

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