2013 Fiscal Year Final Research Report
Sedimentation switch of diatoms for new understandings in ocean chemistry
| Project/Area Number |
23310008
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Kyushu University |
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Principal Investigator |
AKAGI Tasuku 九州大学, 理学(系)研究科(研究院), 教授 (80184076)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Kozo 北星学園大学, 社会福祉学部, 教授 (30244875)
SANO Hiroyoshi 九州大学, 大学院・理学研究院, 教授 (80136423)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | ケイ藻 / 珪酸殻 / デジタルアクション / 希土類元素 / 炭素同位体比 / 生物ポンプ |
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| Research Abstract |
Diatom frustules tend to retain their chemical information when they form mega-aggregates. Using this property the chemical entity of diatom frustulea and chemical species of dissolved rare earth elements (REEs) in seawater are identified.
1.Difference in individual frustule specimens was too great to allow clear discussion on dissolution kinetics./2.Diatom frustules contain terrigenous elements at concentrations of 1/100-1/10 that of terrigenous matter./3.A majority of REEs dissolve as silicic acid complexes in seawater and diatoms can absorb them to incorporate into frustules./4.Diatoms digest terrigenous silicates to incorporate into frustules./5.Most of organic matter in diatom frustules is readily decomposed during settlement and only less than 2% of it remains even when diatomaceous productivity is extremely high.
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[Book] DIATOMS DIVERSITY AND DISTRIBUTION, ROLE IN BIOTECHNOLOGY AND ENVIRONMENTAL IMPACTS 1272013
Author(s)
Akagi, T., Emoto, M., Tadkada, R. & Takahashi, K.
Total Pages
127
Publisher
Nova Science Publishers, Inc., New York, USA
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