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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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bull.fish.66.3.121.pdf1.59 MBPDF見る/開く
この文献には次のDOIがあります:http://doi.org/10.14943/bull.fish.66.3.121

タイトル: Iron requirements of Heterosigma akashiwo(Raphidophyceae), Heterocapsa circularisquama(Dinophyceae) and two common centric diatoms
著者: Fukuzaki, Koji 著作を一覧する
Yoshioka, Takahito 著作を一覧する
Sawayama, Shigeki 著作を一覧する
Imai, Ichiro 著作を一覧する
キーワード: artifical synthetic medium
half-saturation constant
culture experiment
iron requirement
maximum growth rate
発行日: 2016年12月27日
出版者: 北海道大学大学院水産科学研究院
誌名: 北海道大学水産科学研究彙報
巻: 66
号: 3
開始ページ: 121
終了ページ: 128
抄録: 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.
資料タイプ: bulletin (article)
URI: http://hdl.handle.net/2115/64176
出現コレクション:第66巻 第3号

 

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