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Journal of Applied Phycology

, Volume 24, Issue 2, pp 181–186 | Cite as

Effect of temperature on cell growth and production of transparent exopolymer particles by the diatom Coscinodiscus granii isolated from marine mucilage

  • Tsuyoshi Fukao
  • Katsunori Kimoto
  • Yuichi Kotani
Article

Abstract

In the autumn of 2007, marine mucilage caused by the diatom Coscinodiscus granii occurred in the central area of Ariake Sound, Japan, and resulted in damage to fishery. To elucidate the mechanism underlying the outbreak of marine mucilage, we examined the effect of temperature on cell growth and production of transparent exopolymer particles (TEPs) in a culture of this species. Growth and TEP production of C. granii are influenced by temperature. The maximum growth rate (1.63 divisions day−1) and cell yield (1,280 cells mL−1) at all temperatures were obtained at 30°C. Optimal growth rates (>1.15 divisions day−1: ca. 70% of maximum) and cell yield (>900 cells mL−1: ca. 70% of maximum) were observed at temperatures of 25–30°C. TEP production by C. granii depended on whether volume- or cell-related values were considered. The maximum volume-normalized increase rates and concentrations of TEP at all temperatures were observed at 25°C. However, when production rates and concentrations of TEP were normalized to cell numbers, optimal values were measured at 10–15°C. In Ariake Sound, when marine mucilage caused by C. granii occurred, the temperature ranged from 25.0 to 25.4°C. This suggests that growth conditions of C. granii are important factors for production of marine mucilage.

Keywords

Coscinodiscus granii Diatom Marine mucilage Temperature Transparent exopolymer particles (TEP) 

Notes

Acknowledgment

The authors wish to thank Dr. T. Yamatogi (Nagasaki Prefectural Institute of Fisheries) for his helpful comments during the preparation of this manuscript.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Tsuyoshi Fukao
    • 1
    • 2
  • Katsunori Kimoto
    • 1
  • Yuichi Kotani
    • 1
  1. 1.Seikai National Fisheries Research InstituteFisheries Research AgencyNagasaki-shiJapan
  2. 2.Faculty of AgricultureKagawa UniversityKita-gunJapan

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