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EXTREMELY HIGH GROWTH RATE OF THE SMALL DIATOM CHAETOCEROS SALSUGINEUM ISOLATED FROM AN ESTUARY IN THE EASTERN SETO INLAND SEA, JAPAN1
Version of Record online: 10 JUL 2012
© 2012 Phycological Society of America
Journal of Phycology
Volume 48, Issue 5, pages 1284–1288, October 2012
How to Cite
Ichimi, K., Kawamura, T., Yamamoto, A., Tada, K. and Harrison, P. J. (2012), EXTREMELY HIGH GROWTH RATE OF THE SMALL DIATOM CHAETOCEROS SALSUGINEUM ISOLATED FROM AN ESTUARY IN THE EASTERN SETO INLAND SEA, JAPAN. Journal of Phycology, 48: 1284–1288. doi: 10.1111/j.1529-8817.2012.01185.x
Received 11 April 2011. Accepted 10 April 2012.
- Issue online: 4 OCT 2012
- Version of Record online: 10 JUL 2012
- Accepted manuscript online: 4 MAY 2012 10:17AM EST
- estuarine diatom;
- growth rate;
- high light;
- high temperature
Small single-celled Chaetoceros sp. are often widely distributed, but frequently overlooked. An estuarine diatom with an extremely high growth potential under optimal conditions was isolated from the Shinkawa-Kasugagawa estuary in the eastern part of the Seto Inland Sea, western Japan. It was identified as Chaetoceros salsugineum based on morphological observations. This strain had a specific growth rate of 0.54 h−1 at 30°C under 700 μmol · m−2 · s−1 (about 30% of natural maximal summer light) with a 14:10 L:D cycle; there was little growth in the dark. However, under continuous light it grew at only 0.35 h−1 or a daily specific growth rate of 8.4 d−1. In addition, cell density, chlorophyll a, and particulate organic carbon concentrations increased by about 1000 times in 24 h at 30°C under 700 μmol · m−2 · s−1 with a 14:10 L:D cycle, showing a growth rate of close to 7 d−1. This very rapid growth rate may be the result of adaptation to this estuarine environment with high light and temperature. Thus, C. salsugineum can be an important primary producer in this estuary in summer and also an important organism for further physiological and genetic research.