IKENOUE, Takahito

Last updated: Sep 21, 2019 at 13:31

Name	IKENOUE, Takahito
E-mail	ikenouekaiseiken.or.jp
URL	http://www.kaiseiken.or.jp/english/index.html
Affiliation	MARINE ECOLOGY RESEARCH INSTITUTE
Section	Central Laboratory Marine Environment Group
Job title	Scientist
Degree	Ph.D.(Kyushu University (26 March, 2013))
Research funding number	70725051
ORCID ID	0000-0003-1693-8434

Profile

Main Research Interests

Biological oceanography (Radiolaria), micropaleontology, paleoceanography

Understanding climate change and material cycle by sediment trap and other time-series data set in the subarctic North Pacific, Bering Sea and Arctic Ocean

Understanding biological productivity, and intermediate-deep water ventilation during the Plio-Pleistocene by using marine sediment cores

Research Areas

Environmental science / Environmental dynamic analysis /
Earth and planetary science / Stratigraphy/Paleontology /

Academic & Professional Experience

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Apr 2014

Today

Scientist, Central Laboratory Marine Environment Group, MARINE ECOLOGY RESEARCH INSTITUTE

Apr 2013

Mar 2014

Visiting Researcher, RIGC, Japan Agency for Marine-Earth Science and Technology

May 2013

Nov 2013

Guest Researcher, Natural History Museum, Department of Geology, University of Oslo

Apr 2013

Mar 2014

JSPS Post-doctoral Research Fellow, Kyushu University

Apr 2012

Mar 2013

JSPS Research Fellow (DC2), Kyushu University

Education

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Apr 2010

Mar 2013

Department of Earth and Planetary Sciences (Doctor), Graduate School of Science, Kyushu University

Apr 2008

Mar 2010

Department of Earth and Planetary Sciences (Master), Graduate School of Science, Kyushu University

Apr 2004

Mar 2008

Department of Earth and Planetary Sciences (Bachelor), Graduate School of Science, Kyushu University

Apr 1999

Mar 2002

Fukuoka Prefectural Shuyukan High School

Research Grants & Projects

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南北両極域のケイ質殻プランクトンがケイ素循環に果たす役割の解明

JSPS: 科学研究費補助金　基盤研究（C）　【研究代表者】

Project Year: Apr 2017 - Mar 2020 Investigator(s): IKENOUE, Takahito

西部北極海の海氷減少と海洋渦が生物ポンプに与える影響評価

日本学術振興会: 科学研究費補助金　基盤研究（Ａ）　【連携研究者】

Project Year: Apr 2015 - Mar 2018 Investigator(s): Jonaotaro Onodera

大型単細胞真核生物フェオダリアが炭素・ケイ素循環に果たす役割の定量評価：2014－2016年西部北太平洋における時系列フラックス変動

The Japan Science Society: The Sasakawa Scientific Research Grant

Project Year: Apr 2017 - Feb 2018 Investigator(s): IKENOUE, Takahito

放散虫骨格構造の水平分布に基づく北極海環境指標の探求

JSPS: 科学研究費補助金　若手研究（B）　【研究代表者】

Project Year: Apr 2014 - Mar 2017 Investigator(s): Takahito IKENOUE

フェオダリアは海洋炭素循環にどれだけの貢献をしているか？

JSPS: 科学研究費補助金特別研究員奨励費　【研究代表者】

Project Year: Apr 2012 - Mar 2014 Investigator(s): Takahito IKENOUE

Published Papers

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Phaeodaria: An important carrier of particulate organic carbon in the mesopelagic twilight zone of the North Pacific Ocean

Ikenoue, T., Kimoto, K., Okazaki, Y., Sato, M., Honda, M.C., Takahashi, K., Harada, N., Fujiki, T.

Global Biogeochemical Cycles 33(8) 1146-1160 Aug 2019 [Refereed]

A 30-year record reveals re-equilibration rates of ¹³⁷Cs in marine organisms after the Fukushima Dai-ichi Nuclear Power Plant accident: concentration ratios in pre- and post-event conditions

Takata, H., Johansen, M.P., Kusakabe, M., Ikenoue, T., Yokota, M., Takaku, H.

Science of the Total Environment 675 694-704 Jul 2019 [Refereed]

Horizontal and vertical distribution of polycystine radiolarians in the western Arctic Ocean during the late summers of 2013 and 2015

Ikenoue, T., Bjørklund, K.R., Fujiwara, A., Uchimiya, M., Kimoto, K., Harada, N., Nishino, S.

Polar Biology 42(2) 285-305 Feb 2019 [Refereed]

Contribution of ¹³⁷Cs-enriched particles to radiocesium concentrations in seafloor sediment: reconnaissance experiment

Ikenoue, T., Ishii, N., Kusakabe, M., Takata, H.

PLoS ONE 13(9) e0204289 Sep 2018 [Refereed]

Appearances of Fukushima Daiichi Nuclear Power Plant-derived ¹³⁷Cs in coastal waters around Japan: Results from marine monitoring off nuclear power plants and facilities, 1983–2016.

Takata, H., Kusakabe, M., Inatomi, N., Ikenoue, T.

Environmental science & technology 52(5) 2629-2637 Jan 2018 [Refereed]

Decline in radiocesium in seafloor sediments off Fukushima and nearby prefectures

Kusakabe, M., Inatomi, N., Takata, H., Ikenoue, T.

Journal of Oceanography 73(5) 529-545 Oct 2017 [Refereed]

Temporal variation of cesium isotope concentrations and atom ratios in zooplankton in the Pacific off the east coast of Japan

Ikenoue, T., Takata, H., Kusakabe, M., Kudo, N., Hasegawa, K., Ishimaru, T.

Scientific Reports 7 39874 Jan 2017 [Refereed]

The contribution of sources to the sustained elevated inventory of ¹³⁷Cs in offshore waters east of Japan after the Fukushima Dai-ichi Nuclear Power Station Accident

Takata, H., Kusakabe, M., Inatomi, N., Ikenoue, T., Hasegawa, K.

Environmental Science and Technology 50 6957-6963 Jun 2016 [Refereed]

Bering Sea radiolarian biostratigraphy and paleoceanography at IODP Site U1341 during the last four million years

Ikenoue, T., Okazaki, Y., Takahashi, K., Sakamoto, T.

Deep-Sea Research Part II 125-126 38-55 Apr 2016 [Refereed]

Two new living Entactinaria (Radiolaria) species from the Arctic province: Joergensenium arcticum n. sp. and Joergensenium clevei n. sp.

Ikenoue, T., Bjørklund, K.R., Dumitrica, P., Krabberød, A.K., Kimoto, K., Matsuno, K., Harada, N.

Marine Micropaleontology 124 75-94 Apr 2016 [Refereed]

Remobilization of radiocesium on riverine particles in seawater: The contribution of desorption to the export flux to the marine environment

Takata, H., Hasegawa, K., Oikawa, S., Kudo, N., Ikenoue, T., Isono, R. S., Kusakabe, M.

Marine Chemistry 176 51-63 Nov 2015 [Refereed]

Flux variations and vertical distributions of siliceous Rhizaria (Radiolaria and Phaeodaria) in the western Arctic Ocean: indices of environmental changes

Ikenoue, T., Bjørklund, K.R., Kruglikova, S.B., Onodera, J., Kimoto, K., Harada, N.

Biogeosciences 12 2019-2046 Mar 2015 [Refereed]

Rhizoplegma boreale (Radiolaria): a tracer for mesoscale eddies from coastal areas

Ikenoue, T., Ueno, H., and Takahashi, K.

Journal of Geophysical Research 117 C04001 Apr 2012 [Refereed]

Museum archives of the 19 years long time-series sediment trap samples collected at central subarctic Pacific Station SA and Bering Sea Station AB during 1990-2010

Takahashi, K., Asahi, H., Okazaki, Y., Onodera, J., Tsutsui, H., Ikenoue, T., Kanematsu, Y., Tanaka, S., Iwasaki, S.

Memoirs of the Faculty of Science, Kyushu University. Series D, Earth and planetary sciences 32(4) 1-38 Mar 2012 [Refereed]

Fifteen year time-series of radiolarian fluxes and environmental conditions in the Bering Sea and the central subarctic Pacific, 1990–2005

Ikenoue, T., Takahashi, K., Tanaka, S.

Deep-Sea Research Part II 61-64 17-49 Feb 2012 [Refereed]

Occurrences of radiolarian biostratigraphic markers Lychnocanoma nipponica sakaii and Amphimelissa setosa in Core YK07-12 PC3B from the Okhotsk Sea

Ikenoue, T., Takahashi, K., Sakamoto, T., Sakai, S., Iijima, K.

Memoirs of the Faculty of Science, Kyushu University. Series D, Earth and Planetary Sciences 32(3) 1-10 Mar 2011 [Refereed]

Seasonal flux changes of radiolarians at Station K2 in the Western Subarctic Gyre

Ikenoue, T., Takahashi Kozo, Ishitani Yoshiyuki, Tanaka Seiji

Umi no Kenkyu (Oceanography in Japan) 19(4) 165-185 Jul 2010 [Refereed]

Books etc

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AQUABIOLOGY 243 (Vol.41-No.4)

Hyoe Takata, Masashi Kusakabe, Takahito Ikenoue, Mizuro Yokota, Hiroshi Takaku (Part:Contributor, Evaluaion of recession process of marine biota in Japan after the 11 March 2011 accident by biota-seawater concentration ratio of global fallout-137Cs (pp. 377-384))

Seibutsu Kenkyusha Co., Ltd Aug 2019 ISBN:978-4-909119-23-0

AQUABIOLOGY 236 (Vol.40-No.3)

Takahito Ikenoue (Part:Contributor, On factors controlling high concentration of <sup>137</sup>Cs in zooplankton in the area around TEPCO Fukushima Dai‑ichi Nuclear Power Plant (pp. 279-285))

Seibutsu Kenkyusha Co., Ltd Jun 2018 ISBN:978-4-909119-08-7

AQUABIOLOGY 230 (Vol.39-No.3)

Hyoe Takata, Masashi Kusakabe, Takahito Ikenoue (Part:Contributor, Decreasing trends of 137Cs concentrations in the marine environment after the TEPCO’s Fukushima Dai-ichi Nuclear Power Plant accident (pp. 274-281))

Seibutsu Kenkyusha Co., Ltd. Jun 2017 ISBN:978-4-909119-02-5

AQUABIOLOGY 218（Vol.37-No.3）

Hyoe Takata, Hideki Kaeriyama, Minoru Kitamura, Mizuro Yokota, Takahito Ikenoue and Masashi Kusakabe (Part:Contributor, Spatial and temporal change of radiocesium in zooplankton in the marine environment after the Fukushima Dai-ichi Nuclear Power Plant accident (pp. 310-318))

Seibutsu Kenkyusha Co., Ltd. Jun 2015 ISBN:978-4-915342-94-3

Misc

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放散虫① ～太古の昔から次々と生み出される造形美

Takahito Ikenoue

海の豆知識 80 Jul 2019

微化石は過去の情報が詰まったタイムカプセル

Takahito Ikenoue

海の豆知識 79 Apr 2019

放射性微粒子が海底土中の¹³⁷Cs濃度に及ぼす影響に関する予察的研究

Takahito Ikenoue

海生研ニュース 142 3-4 Apr 2019

白鳳丸南極航海記

Takahito Ikenoue

海生研ニュース 142 8-9 Apr 2019

海底に降り積もるプランクトンの骨格

Takahito Ikenoue

海の豆知識 78 Jan 2019

「わたしたちの生活と海の研究」ブース出展報告　出展参加体験記

IKENOUE Takahito

JOS News Letter 5(4) 9-10 Mar 2016

エッセイ-潮だまり, 北欧で出会った偉大な英雄

IKENOUE Takahito

海生研ニュース 126 11 Apr 2015

Flux variations and vertical distributions of microzooplankton (Radiolaria) in the western Arctic Ocean: environmental indices in a warming Arctic

Ikenoue, T., Bjørklund, K.R., Kruglikova, S.B., Onodera, J., Kimoto, K., Harada, N.

Biogeosciences Discuss 11 16645-16701 Dec 2014

アカデミアメランコリア（第６回）若手のコラム

IKENOUE Takahito

JOS News Letter 4(3) 19-20 Nov 2014

新人エッセイ, プランクトンから海洋環境の変化を読み解く

IKENOUE Takahito

MERI NEWS 123 9 Jul 2014

第13回INTERRAD-International Conference on Fossil and Recent Radiolarians-参加報告

伊藤　剛, 池上　隆仁, 小安　浩理

日本地質学会News 15(10) 14-15 Oct 2012

トピックス-プランクトンが語る海流の変化

IKENOUE Takahito

九大理学部ニュース Jun 2012

「人のからだ・動物のからだ」

高橋孝三・池上隆仁

九州大学総合研究博物館ウェブサイト公開展示 Feb 2011

トピックス-プランクトンで知る海の環境

IKENOUE Takahito

九大理学部ニュース Sep 2010

Conference Activities & Talks

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The role of phaeodarians in the marine carbon cycle [Invited]

Ikenoue, T., Kimoto, K., Okazaki, Y., Sato, M., Honda, M.C., Takahashi, K., Harada, N., Fujiki, T.

The Geochemical Society of Japan 2019 17 Sep 2019 The Geochemical Society of Japan

Integrated observations for marine earth science in the Indian sector of the Southern Ocean: Preliminary results of R/V Hakuho-maru KH-19-1 cruise

Minoru Ikehara, Kay I. Ohshima, Takuya Itaki, Hiroshi Sato, Masakazu Fujii, Michiyo Yamamoto-Kawai, Hiroki Matsui, Takahito Ikenoue, . Scientific Party of R/V Hakuho-maru KH-19-1 cruise

Japan Geoscience Union Meeting 2019 27 May 2019 JpGU

Quantitative determination of silica content in siliceous shell plankton using Microfocus X-ray CT [Invited]

Ikenoue, T., Katsunori Kimoto, Yuriko Nakamura, Naoki Kuramoto, Masaaki Ueki, Yuichi Ota, Kjell R. Bjørklund, Jonaotaro Onodera, and Naomi Harada

The Ninth Symposium on Polar Science 6 Dec 2018 National Institute of Polar Research

日本海側の沿岸海水中に確認された福島第一原発事故由来の放射性セシウム

高田兵衛, 日下部正志, 稲富直彦, 池上隆仁, 城谷勇陛, 井上睦夫

日本地球化学会第65回年会 13 Sep 2018 日本地球化学会

日本近海における海水中のヨウ素-129 濃度の時空間的変動 (2006-2017)

日下部正志, 池上隆仁, 御園生淳

日本地球化学会第65回年会 13 Sep 2018 日本地球化学会

Social Contribution

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「海」には謎がいっぱい―海の謎を探る研究あれこれ（日本海洋学会教育問題研究会　企画番号　P33)

[Demonstrator] 独立行政法人国立女性教育会館(NWEC) 女子中高生夏の学校2018〜科学・技術・人との出会い〜 (国立女性教育会館) 10 Aug 2018 - 10 Aug 2018

海の小さな生き物たちをとりまく不思議な世界（日本海洋学会教育問題研究会　企画番号 151)

[Demonstrator] Japan Science and Technology Agency Science Agora (テレコムセンター) 26 Nov 2017 - 26 Nov 2017

わたしたちの生活と海の研究（日本海洋学会教育問題研究会　ブース番号 Da-312)　

[Demonstrator] Japan Science and Technology Agency Science Agora (東京都立産業技術研究センター) 14 Nov 2015 - 15 Nov 2015

Research Interests

Association Memberships

Society for the Studies of Paleo-Geosciences(2) , American Geophysical Union(865) , The Oceanographic Society of Japan(266) , Ocean Literacy and Education Panel(1) , THE PLANKTON SOCIETY OF JAPAN(50) , Japan Geoscience Union(787) , Japan Consortium of Arctic Environmental Research(1) , Japan Society for Science Visualization(2)

Committee Memberships

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Nov 2013

Mar 2014

Micropaleontological Referencett Center Workshop　2014　 Executive Commiee Executive Committee

Works

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放散虫イラスト原画・ポストカード

（株）ウサギノネドコ京都店 Educational Materials Aug 2017

イラストレーターの池田早秋により描かれたイラスト。鈴木紀毅（東北大学）・相田吉昭（宇都宮大学）・池上隆仁（海洋生物環境研究所）がイラストのモチーフとなる資料提供を行った。

Microfocus X-ray Computed Tomography cross-sectional images of Joergensenium arcticum Ikenoue, Dumitrica and Bjørklund n. sp.

Ikenoue, Takahito; Bjorklund, Kjell R; Dumitrica, Paulian; Krabberød, Anders K; Kimoto, Katsunori; Matsuno, Kohei; Harada, Naomi Database Apr 2016

Museum archives of the 19 years long time-series sediment trap samples collected at central subarctic Pacific Station SA and Bering Sea Station AB during 1990-2010

Takahito Ikenoue Database Mar 2012

3,552 点の試料について、2012年3月1日に主要部分を九州大学理学研究院紀要（Takahashi et al., 2012: Memoirs of the Faculty of Sciences, Kyushu University）として出版. p. 4, p. 13-38 のTable 1-7をデータベースとして作成.

九州大学総合研究博物館サテライト展示「人のからだ・動物のからだ」放散虫～この美しき生き物たち, 糸島市伊都文化会館

Kozo Takahashi and Takahito Ikenoue Educational Materials Mar 2011

九州大学総合研究博物館サテライト展示「人のからだ・動物のからだ」放散虫～この美しき生き物たち, 志摩歴史資料館

Kozo Takahashi and Takahito Ikenoue Educational Materials Feb 2011 - Mar 2011

第４回九州大学総合研究博物館・福岡市立少年科学文化会館合同企画展人のからだ・動物のからだ」展放散虫ポストカード10種

Takahito Ikenoue and Kozo Takahashi Educational Materials Jul 2010 - Aug 2010

環境を語る小さな生き物 -放散虫〜この美しき生き物たち-展示パネル, 第11回九州大学総合研究博物館公開展示（第４回九州大学総合研究博物館・福岡市立少年科学文化会館合同企画展）「人のからだ・動物のからだ」

Kozo Takahashi and Takahito Ikenoue Educational Materials Jul 2010 - Aug 2010

Cruise

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講師としての講演歴

2014年3月　小野寺丈尚太郎・池上隆仁　MRC2014 ショートコース：探検！実験！微化石生物の生態を探る「エブリディアン、珪質鞭毛藻、フェオダリアサンプルの観察」. 微古生物学リファレンスセンター(MRC)研究集会2014.

Cruises

Annual sediment trap cruises in the Arctic Sea Sea: 2013 R/V MIRAI (MR13-06)
Beaufort-Chukchi Seas IOS Cruise: 2011 CCGS Sir Wilfrid Laurier
Annual sediment trap cruises in the Bering Sea: 2010 T/S Oshoro-maru
Annual sediment trap cruises in the Bering Sea: 2009 T/S Oshoro-maru
Coring Cruise in the Okhotsk Sea: 2007 R/V YOKOSUKA (YK07-12)

Fellowships

2012 JASSO Repayment Exemption for Students with Particularly Outstanding Results
2007 Kyushu University Special Scholarship, Kyushu University

License

Curator

国等からの受託研究課題

平成26〜29年度：放射性物質影響調査推進委託事業（水産庁委託）
平成26〜31年度：海洋環境における放射能調査及び総合評価（原子力規制庁）

Peer review

Marine Ecology Progress Series, Frontiers in Marine Science, The ISME Journal