Takahito Ikenoue - My portal

Profile Information

Affiliation: Researcher, Marine Plastics Research Group, Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology

Degree: Ph.D. (Science)(Mar, 2013, Kyushu University (26 March, 2013))
Master of Science(Mar, 2010, Kyushu University (25 March, 2010))
Bachelor of Science(Mar, 2008, Kyushu University (25 March, 2008))

Contact information: ikenouetjamstec.go.jp
Researcher number: 70725051
ORCID iD: https://orcid.org/0000-0003-1693-8434
J-GLOBAL ID: 201101050260668661
Researcher ID: F-4215-2015
researchmap Member ID: B000005398

External link: https://www.jamstec.go.jp/souran/html/Takahito_Ikenoue_99d1c-e.html

Main Research Interests

Biological oceanography, Micropaleontology, Paleoceanography, Environmental radioactivity, Microplastics

The role of siliceous shell plankton on the carbon and silicon cycles in the Ocean

Dynamics of radioactive particles in the Ocean

Quantitative evaluation of microplastic abundance and vertical flux in the Ocean

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

Press release (2024/8/26)

An observational study of microplastics sinking into the deep sea off the Boso Peninsula
https://www.jamstec.go.jp/e/about/press_release/20240826/

Press release (2022/11/2)

The water-column microplastic inventory in the Arctic Ocean on the Pacific side (Chukchi Sea) was estimated for the first time
～Discovering that the key is the inflow from the Pacific Ocean～
https://www.jamstec.go.jp/e/about/press_release/20221102/
https://www.spf.org/en/spfnews/pressrelease/20221102.html

Research Areas

Major Papers

17

Vertical Flux of Microplastics in the Deep Subtropical Pacific Ocean: Moored Sediment-Trap Observations within the Kuroshio Extension Recirculation Gyre

Ikenoue, T, Nakajima, R, Osafune, S, Siswanto, E, Honda, M.C

Environmental Science & Technology, 58(36) 16121-16130, Sep 10, 2024 Peer-reviewedLead authorCorresponding author
19

Floating microplastic inventories in the southern Beaufort Sea, Arctic Ocean

Ikenoue, T, Nakajima, R, Mishra, P, Ramasamy, E.V, Fujiwara, A, Nishino, S, Murata, A, Watanabe, E, Itoh, M

Frontiers in Marine Science, 10 1288301-1288301, Oct 12, 2023 Peer-reviewedLead authorCorresponding author
14

Radiolaria and Phaeodaria (siliceous Rhizaria) in south-western and northern Norwegian fjords during late summer 2016: dominant species and biomass in shallow-water assemblages

Ikenoue, T, Bjørklund, K.R, Krabberød, A.K, Nishino, S, Wassmann, P

Polar Research, 42 9584, Sep 21, 2023 Peer-reviewedLead authorCorresponding author
14

Horizontal distribution of surface microplastic concentrations and water-column microplastic inventories in the Chukchi Sea, western Arctic Ocean

Ikenoue T, Nakajima R, Fujiwara A, Onodera J, Itoh M, Toyoshima J, Watanabe E, Murata A, Nishino S, Kikuchi, T

Science of the Total Environment, 855 159564-159564, Nov 1, 2022 Peer-reviewedLead authorCorresponding author
Cesium-137 and ¹³⁷Cs/¹³³Cs atom ratios in marine zooplankton off the east coast of Japan during 2012–2020 following the Fukushima Dai-ichi nuclear power plant accident

Ikenoue, T, Yamada, M, Ishii, N, Kudo, N, Shirotani, Y, Ishida, Y, Kusakabe, M

Environmental Pollution, 311 119962, Oct 15, 2022 Peer-reviewedLead authorCorresponding author
10

Neocalanus cristatus (Copepoda) from a deep sediment-trap: abundance and implications for ecological and biogeochemical studies

Ikenoue, T, Otosaka, S, Honda, M.C, Kitamura, M, Mino, Y, Narita, H, Kobayashi, T

Frontiers in Marine Science, 9 884320, May 20, 2022 Peer-reviewedLead authorCorresponding author
17

New evaluation of species‐specific biogenic silica flux of radiolarians (Rhizaria) in the western Arctic Ocean using microfocus X‐ray computed tomography

Ikenoue, T, Kimoto, K, Nakamura, Y, Bjørklund, K.R, Kuramoto, N, Ueki, M, Ota, Y, Onodera, J, Harada, N, Honda, M.C …

Limnology and Oceanography, 66(11) 3901-3915, Nov 9, 2021 Peer-reviewedLead authorCorresponding author
Occurrence of highly radioactive microparticles in the seafloor sediment from the Pacific coast 35 km northeast of the Fukushima Daiichi Nuclear Power Plant

Ikenoue, T, Takehara, M, Morooka, K, Kurihara, E, Takami, R, Ishii, N, Kudo, N, Utsunomiya, S

Chemosphere, 267 128907, Mar, 2021 Peer-reviewedLead authorCorresponding author
Temporal variation of iodine-129 concentrations in kelps (Saccharina) from coastal waters off northern Japan

Ikenoue, T, Kusakabe, M, Yamada, M, Oikawa, S, Misonoo, J

Marine Pollution Bulletin, 161 111775, Dec, 2020 Peer-reviewedLead authorCorresponding author
16

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 Peer-reviewedLead authorCorresponding author
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 15, 2019 Peer-reviewedLead authorCorresponding author
16

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 Peer-reviewedLead authorCorresponding author
On factors controlling high concentration of ¹³⁷Cs in zooplankton in the area around TEPCO Fukushima Dai‑ichi Nuclear Power Plant

IKENOUE Takahito

AQUABIOLOGY 236 (ISBN 9784909119087), 40(3) 279-285, Jun, 2018 Lead authorCorresponding author
13

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 Peer-reviewedLead authorCorresponding author
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 Peer-reviewedLead authorCorresponding author
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 Peer-reviewedLead authorCorresponding author
10

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(6) 2019-2046, Mar, 2015 Peer-reviewedLead authorCorresponding author
14

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

Ikenoue, T, Ueno, H, Takahashi, K

Journal of Geophysical Research, 117 C04001, Apr, 2012 Peer-reviewedLead authorCorresponding author
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 Peer-reviewedLead authorCorresponding author
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 Peer-reviewedLead authorCorresponding author
Seasonal flux changes of radiolarians at Station K2 in the Western Subarctic Gyre

Ikenoue, T, Takahashi, K, Ishitani, Y, Tanaka, S

Oceanography in Japan, 19(4) 165-185, Jul 5, 2010 Peer-reviewedLead authorCorresponding author

Major Research Projects

西部北極海の海水中マイクロプラスチックの存在量と沈降フラックスの定量評価

Grant-in-Aid for Scientific Research (C), 基盤研究C, Japan Society for the Promotion of Science, Apr, 2023 - Mar, 2026

Takahito Ikenoue
海洋課題北極海環境動態の解明と汎用データセットの構築

ArCS II: Arctic Challenge for Sustainability II, Ministry of Education, Culture, Sports, Science and Technology, Apr, 2022 - Mar, 2025

Watanabe Eiji, Ueno Hiromichi, Itoh Motoyo, Kimura Satoshi, Zhang Yuanxin, Yasunaka Sayaka, Hatta Mariko, Nakajima Ryota, Ikenoue Takahito, Murata Akihiko, Shigemitsu Masahito, Noguchi Maki, Nishino Shigeto, Onodera Jonaotaro, Fujiwara Amane, Sugie Koji, Kimoto Katsunori, Kitamura Minoru, Abe Hiroto, Matsuno Kohei, Kasai Akihide, Kawakami Tatsuya, Nomura Daiki, Hirata Takafumi, García Molinos Jorge、Alabia Dolorfino Irene, Ohshima Keiichiro, Nishioka Jun, Kameyama Sohiko, Yamamoto Masanobu, Hirawake Toru, Ito Masato, Harada Naomi, Shiozaki Takuhei, Kawaguchi Yusuke, Kodaira, Tsubasa、Mizobata Kohei, Kawai Michiyo
ハイパースペクトルカメラによるマイクロプラスチック自動分析手法の開発

科学技術試験研究委託事業海洋資源利用促進技術開発プログラム, 文部科学省, Apr, 2022 - Mar, 2023

藤倉克則, 金谷有剛, 千葉早苗, 小栗一将, Dhugal Lindsay, 野牧秀隆, 土屋正史, 中嶋亮太, 朱春茂, 池上隆仁, 下出信次
フェオダリアが南大洋インド洋区季節海氷域の生物ポンプに果たす役割の解明

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Japan Society for the Promotion of Science, Apr, 2020 - Mar, 2022

Takahito Ikenoue
Elucidation of the role of siliceous shell plankton on the silicon cycle in the north and south polar regions

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2017 - Mar, 2020

Takahito Ikenoue, Katsunori Kimoto
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 Sasakawa Scientific Research Grant, The Japan Science Society, Apr, 2017 - Feb, 2018

IKENOUE, Takahito
An exploration of environmental indices in the Arctic Ocean based on horizontal distribution of radiolarian skeletal structures

Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Japan Society for the Promotion of Science, Apr, 2014 - Mar, 2017

IKENOUE Takahito
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?

Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows, Grant-in-Aid for JSPS Fellows, Japan Society for the Promotion of Science, Apr, 2012 - Mar, 2014

IKENOUE Takahito

Awards

Dec, 2023

The iwate Prefectural Governor's Prize (general category) for research paper on the Sanriku Sea Area, Iwate Prefecture, FY2023, Study on Radioactive Iodine-129 Concentration Indicators in Seawater Using Kelps from the Coastal Waters of Northern Japan, Iwate Prefectural Government

Takahito Ikenoue

Research History

Dec, 2021 - Present

Researcher, Marine Plastic Research Group Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology
Apr, 2021 - Nov, 2021

Scientist, Head Office, Marine Ecology Research Institute
Apr, 2014 - Mar, 2021

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
Apr, 2013 - Mar, 2014

JSPS Post-doctoral Research Fellow, Kyushu University
May, 2013 - Nov, 2013

Guest Researcher, Natural History Museum, Department of Geology, University of Oslo
Apr, 2012 - Mar, 2013

JSPS Research Fellow (DC2), Kyushu University

Education

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

Major Books and Other Publications

海洋生物と放射能の疑問50 (みんなが知りたいシリーズ21)

池上隆仁 (Role: Contributor, Question 15、16、17、22、28、31を執筆)

成山堂書店, Aug 28, 2024 (ISBN: 4425984412)
プランクトン: クラゲ・ミジンコ・小さな水の生物 (小学館の図鑑NEO POCKET)

Takahito Ikenoue (Role: Supervisor (editorial), フェオダリア、放散虫 (page 138-143))

株式会社小学館, Jun 25, 2024 (ISBN: 4092172974)

Major Misc.

2

北極海における海洋プラスチック循環の解明を目指して

Takahito Ikenoue

Ocean Newsletter, 585 4-5, Dec 20, 2024 InvitedLead authorCorresponding author
「私たちの生活と母なる海ー海の未来が気になるー」出展報告

轡田邦夫・池田元美・池上隆仁・市川洋・伊藤進一・今宮則子・上野洋路・大林由美子・柏野祐二・川合美千代・越田勇気・須賀利雄・野村英明・藤井直紀・安中さやか・渡部裕美

JOS News Letter, 14(1) 6-8, Jun 1, 2024
南⼤洋インド洋区南極前線南側ECR-1 の沈降粒⼦フラックスに関する予察

池上隆仁, 林亮太, 岡崎裕典, 池原実

平成29年度－令和3年度文部科学省科学研究費助成事業「新学術領域研究（研究領域提案型）」「熱ｰ水ｰ物質の巨大リザーバ全球環境変動を駆動する南大洋・南極氷床」研究成果報告書, 228-230, Mar 10, 2023 Lead authorCorresponding author
12

The Frontiers of Arctic Research, Abundance of Microplastics Suspended and Entering the Chukchi Sea was Estimated

Takahito Ikenoue

ArCS II News Letter, 6 3, Feb 2, 2023 Lead authorCorresponding author
12

北極域研究の最前線、チュクチ海に浮遊・流入するマイクロプラスチック量を初めて推定

池上隆仁

ArCS II News Letter, 6 3, Feb 2, 2023 Lead authorCorresponding author
52

エッセイ-潮だまり, あの日，2011年3月11日を振り返って

Takahito Ikenoue

海生研ニュース, 153 8-9, Jan, 2022 Lead authorCorresponding author
11

有孔虫② ～気候変動のシグナルを記録

IKENOUE Takahito

海の豆知識, 86, Jan 19, 2021 Lead authorCorresponding author
11

有孔虫①～古海洋学の花形

IKENOUE Takahito

海の豆知識, 85, Oct 19, 2020 Lead authorCorresponding author
9

表紙写真館山沖より臨む夕焼けの富士山

Takahito Ikenoue

海生研ニュース, 148 12-12, Oct, 2020 Lead authorCorresponding author
80

珪藻②～海洋表層循環の指標

IKENOUE Takahito

海の豆知識, 84, Jul, 2020 Lead authorCorresponding author
10

表紙写真いざ南極へ，白鳳丸から見たテーブルマウンテン

Takahito Ikenoue

海生研ニュース, 146 12-12, Apr, 2020 Lead authorCorresponding author
20

白鳳丸南極航海記2020

Takahito Ikenoue

海生研ニュース, 146 11-11, Apr, 2020 Lead authorCorresponding author
29

フェオダリアが西部北太平洋の海洋炭素循環に果たす役割の定量評価

IKENOUE Takahito

海生研ニュース, 146 7-8, Apr, 2020 Lead authorCorresponding author
12

珪藻① ～海洋生態系の根幹を支える海の森林

IKENOUE Takahito

海の豆知識, 83, Apr, 2020 Lead authorCorresponding author