title: EXTREMELY HIGH GROWTH RATE OF THE SMALL DIATOM CHAETOCEROS SALSUGINEUM ISOLATED FROM AN ESTUARY IN THE EASTERN SETO INLAND SEA, JAPAN(1).
abstract: 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.
authors.affiliation: Aji Marine Station, Seto Inland Sea Regional Research Center, Kagawa University, 4511-15 Kamano, Aji, Takamatsu, Kagawa 761-0130, JapanAtmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, JapanFaculty of Agriculture, Kagawa University, 2393 Ikenobe, Miki, Kita, Kagawa 761-0795, JapanDepartment of Earth & Ocean Sciences, University of British Columbia, 2146 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Ichimi
authors.affiliation: Aji Marine Station, Seto Inland Sea Regional Research Center, Kagawa University, 4511-15 Kamano, Aji, Takamatsu, Kagawa 761-0130, JapanAtmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, JapanFaculty of Agriculture, Kagawa University, 2393 Ikenobe, Miki, Kita, Kagawa 761-0795, JapanDepartment of Earth & Ocean Sciences, University of British Columbia, 2146 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada.
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Kawamura
authors.affiliation: Aji Marine Station, Seto Inland Sea Regional Research Center, Kagawa University, 4511-15 Kamano, Aji, Takamatsu, Kagawa 761-0130, JapanAtmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, JapanFaculty of Agriculture, Kagawa University, 2393 Ikenobe, Miki, Kita, Kagawa 761-0795, JapanDepartment of Earth & Ocean Sciences, University of British Columbia, 2146 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada.
authors.forename: Akinori
authors.initials: A
authors.lastname: Yamamoto
authors.affiliation: Aji Marine Station, Seto Inland Sea Regional Research Center, Kagawa University, 4511-15 Kamano, Aji, Takamatsu, Kagawa 761-0130, JapanAtmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, JapanFaculty of Agriculture, Kagawa University, 2393 Ikenobe, Miki, Kita, Kagawa 761-0795, JapanDepartment of Earth & Ocean Sciences, University of British Columbia, 2146 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada.
authors.forename: Kuninao
authors.initials: K
authors.lastname: Tada
authors.affiliation: Aji Marine Station, Seto Inland Sea Regional Research Center, Kagawa University, 4511-15 Kamano, Aji, Takamatsu, Kagawa 761-0130, JapanAtmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, JapanFaculty of Agriculture, Kagawa University, 2393 Ikenobe, Miki, Kita, Kagawa 761-0795, JapanDepartment of Earth & Ocean Sciences, University of British Columbia, 2146 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada.
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Harrison
keywords: Chaetoceros; estuarine diatom; growth rate; high light; high temperature