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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第66巻 第3号 >

Iron requirements of Heterosigma akashiwo(Raphidophyceae), Heterocapsa circularisquama(Dinophyceae) and two common centric diatoms

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Please use this identifier to cite or link to this item:http://doi.org/10.14943/bull.fish.66.3.121

Title: Iron requirements of Heterosigma akashiwo(Raphidophyceae), Heterocapsa circularisquama(Dinophyceae) and two common centric diatoms
Authors: Fukuzaki, Koji Browse this author
Yoshioka, Takahito Browse this author →KAKEN DB
Sawayama, Shigeki Browse this author →KAKEN DB
Imai, Ichiro Browse this author →KAKEN DB
Keywords: artifical synthetic medium
half-saturation constant
culture experiment
iron requirement
maximum growth rate
Issue Date: 27-Dec-2016
Publisher: 北海道大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Volume: 66
Issue: 3
Start Page: 121
End Page: 128
Abstract: Iron is increasingly recognized to play a key role in the growth of microalgae in various marine systems, but there is a paucity of knowledge about the physiological iron requirements of harmful algal species. This study aimed to elucidate the halfsaturation constant for growth(Ks) and the maximum growth rate(μmax) of four phytoplankton species with regard to iron concentrations. The four species were the fish-killing raphidophyte Heterosigma akashiwo, the bivalve-killing dinoflagellate Heterocapsa circularisquama, and the centric diatoms Ditylum brightwellii(large sized) and Chaetoceros didymus(small sized). We conducted incubation experiments with axenic cultures of the four species using a chemically defined synthetic medium. Compared with Heterocapsa circularisquama(0.59 day-1) and Heterosigma akashiwo(0.50 day-1), the two diatom species exhibited high μmax values(0.68 day-1). The smaller diatom had the lowest Ks value of 7.5×10-9M, while the larger diatom had the highest Ks value of 2.1×10-7M. The Ks values of Heterosigma akashiwo and Heterocapsa circularisquama were 5.1×10-8 and 3.1×10-8M, respectively. Smaller-sized phytoplankton showed better affinity to lower concentrations of iron in the sea.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/64176
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第66巻 第3号

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