| Project/Area Number |
26740006
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Marine Ecology Research Institute |
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Principal Investigator |
IKENOUE Takahito 公益財団法人海洋生物環境研究所, 海生研中央研究所, 研究員 (70725051)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 放散虫 / 動物プランクトン / 北極海 / 海氷減少 / 海洋生態系 / 物質循環 / セジメントトラップ / マイクロフォーカスX線CTスキャナ / 環境指標 / マイクロフォーカスX線CT / プランクトン / ボーフォート循環 / 温暖化 |
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| Outline of Final Research Achievements |
We have been studying to clarify application of radiolarian assemblages as environmental indices in the Arctic Ocean where drastic sea ice reduction has been observed. Seasonal variation and vertical distribution of radiolarian abundance were investigated by using time-series sediment trap system and a vertical multiple plankton sampler in the western Arctic Ocean. As a result, we found that the abundance and species composition of radiolarian assemblages varied in response mainly to variation of surface water mass conditions associated with seasonal changes in sea-ice concentration. We also found a new species from the western Arctic Ocean, which was restricted to the Pacific Winter Water, and observed in detail the internal structure of its skeleton using Microfocus X-ray Computed Tomography (MXCT). We applied three-dimensional imaging obtained by the MXCT for the first time in a species description and showed the morphological information with excellent objectivity.
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