SUZUKI Koji

J-GLOBAL         Last updated: Apr 4, 2019 at 17:53
 
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Name
SUZUKI Koji
E-mail
kojisees.hokudai.ac.jp
URL
http://lilac.ees.hokudai.ac.jp/people/kojis/
Affiliation
Hokkaido University
Section
Faculty of Environmental Earth Science, Section of Earth System Science, Climate Dynamics
Research funding number
40283452
ORCID ID
0000-0001-5354-1044

Research Areas

 
 

Academic & Professional Experience

 
Oct 2016
 - 
Today
Professor, Faculty of Environmental Earth Science, Hokkaido University
 
Apr 2007
 - 
Sep 2016
Associate Professor, Faculty of Environmental Earth Science, Hokkaido University
 
Dec 2002
 - 
Mar 2007
Associate Professor, Graduate School of Environmental Earth Science, Hokkaido University
 
Apr 1996
 - 
Nov 2002
Research Associate, Nagoya University
 

Published Papers

 
Xia X, Cheung S, Endo H, Suzuki K, Liu H.
Microb Ecol   77(2) 333-342   2019   [Refereed]
Iizuka Yoshinori, Miyamoto Chihiro, Matoba Sumito, Iwahana Go, Horiuchi Kazuho, Takahashi Yoshio, Kanna Naoya, Suzuki Koji, Ohno Hiroshi
Earth and Planetary Science Letters   515 58-66   2019   [Refereed]
Isada T, Hattori-Saito A, Saito H, Kondo Y, Nishioka J, Kuma K, Hattori H, McKay R. M. L, Suzuki K.
Limnology and Oceanography      2018   [Refereed]
Yuzo Miyazaki, Youhei Yamashita, Kaori Kawana, Eri Tachibana, Sara Kagami, Michihiro Mochida, Koji Suzuki, Jun Nishioka
Scientific Reports      2018   [Refereed]
Endo Hisashi, Hiroyuki Ogata, Koji Suzuki
Scientific Reports   8 10916   2018   [Refereed]
Mizuno Yu, Nishioka Jun, Tanaka Takahiro, Tada Yuya, Suzuki Koji, Tsuzuki Yuta, Sugimoto Atsuko, Yamashita Youhei
Journal of Oceanography   74(5) 509-521   2018   [Refereed]
Yoshida Kazuhiro, Endo Hisashi, Lawrenz Evelyn, Isada Tomonori, Hooker Stanford B, Prášil Ondřej, Suzuki Koji
Estuarine, Coastal and Shelf Science   212 80-94   2018   [Refereed]
Fujiwara Amane, Nishino Shigeto, Matsuno Kohei, Onodera Jonaotaro, Kawaguchi Yusuke, Hirawake Toru, Suzuki Koji, Inoue Jun, Kikuchi Takashi
Polar Biology   41(6) 1279-1295   2018   [Refereed]
Nagao Ippei, Eum Young-Joon, Iwamoto Yoko, Tada Yuya, Suzuki Koji, Tsuda Atsushi, Toratani Mitsuhiro, Hamasaki Koji, Uematsu Mitsuo
Progress in Oceanography   165 145-157   2018   [Refereed]
Kataoka T, Suzuki K, Irino T, Yamamoto M, Higashi S, Liu H.
Arch Microbiol   200(2) 329-342   2018   [Refereed]
Li Yingdong, Jing Hongmei, Xia Xiaomin, Cheung Shunyan, Suzuki Koji, Liu Hongbin
Frontiers in Microbiology   9    2018   [Refereed]
Cheung S, Suzuki K, Saito H, Umezawa Y, Xia X, Liu H.
PLoS One   12(10) e0186875   2017   [Refereed]
Sugie Koji, Suzuki Koji
Limnology and Oceanography   62(3) 884-897   2017   [Refereed]
Endo Hisashi, Hattori Hiroshi, Mishima Tsubasa, Hashida Gen, Sasaki Hiroshi, Nishioka Jun, Suzuki Koji
Polar Biology      2017   [Refereed]
Xia X, Partensky F, Garczarek L, Suzuki K, Guo C, Yan Cheung S, Liu H.
Environ Microbiol   19(1) 142-158   2017   [Refereed]
Goto S, Tada Y, Suzuki K, Yamashita Y.
Front Microbiol   8 507   2017   [Refereed]
Isada Tomonori, Hirawake Toru, Nakada Satoshi, Kobayashi Tsukuru, Sasaki Ken'ichi, Tanaka Yoshiyuki, Watanabe Shuichi, Suzuki Koji, Saitoh Sei-Ichi
Estuarine, Coastal and Shelf Science   188 199-211   2017   [Refereed]
Jing Hongmei, Cheung Shunyan, Xia Xiaomin, Suzuki Koji, Nishioka Jun, Liu Hongbin
Frontiers in Microbiology   8    2017   [Refereed]
Nosaka Yuichi, Yamashita Youhei, Suzuki Koji
Frontiers in Marine Science   4    2017   [Refereed]
Tada Yuya, Nakaya Rie, Goto Shuji, Yamashita Youhei, Suzuki Koji
Journal of Experimental Marine Biology and Ecology   495 119-128   2017   [Refereed]
Waga Hisatomo, Hirawake Toru, Fujiwara Amane, Kikuchi Takashi, Nishino Shigeto, Suzuki Koji, Takao Shintaro, Saitoh Sei-Ichi
Remote Sensing   9(3) 222   2017   [Refereed]
Tada Y, Shiozaki T, Ogawa H, Suzuki K.
Journal of Oceanography   73(2) 145-158   2017   [Refereed]
H. Endo, K. Sugie, T. Yoshimura, and K. Suzuki
PLOS ONE   11 e0154291   Apr 2016   [Refereed]
Fujiwara A, Hirawake T, Suzuki K, Eisner L, Imai I, Nishino S, Kikuchi T, Saitoh S. I.
Biogeosciences   13(1) 115-131   2016   [Refereed]
K. Sugie, K. Suzuki
PLOS ONE      Jun 2015   [Refereed]
Traditionally, biodiversity has often been estimated on the basis of abundance partly due to the need for complicated measurements of biomass. Here, we conducted robust measurements of the community composition and of the size structure of diatoms...
Tomonori Isada, Toru Hirawake, Tsukuru Kobayashi, Yuichi Nosaka, Masafumi Natsuike, Ichiro Imai, Koji Suzuki, Koji Suzuki, Sei Ichi Saitoh
Remote Sensing of Environment   159 134-151   Mar 2015
© 2014 Elsevier Inc. Identification of phytoplankton functional groups is key to understanding marine biogeochemical cycles. For more accurate understanding of phytoplankton community structure and its implications for ocean color remote sensing a...
K. Sugie, K. Suzuki
Diatom Research      Jul 2015   [Refereed]
A new marine planktonic diatom Thalassionema kuroshioensis sp. nov., was described based on morphological comparison with five other extant Thalassionema species. Thalassionema kuroshioensis was found in coastal to offshore regions of the Kuroshio...
Takeshi Yoshimura, Koji Sugie, Koji Sugie, Hisashi Endo, Koji Suzuki, Jun Nishioka, Tsuneo Ono
Deep-Sea Research Part I: Oceanographic Research Papers   94 1-14   Aug 2014
© 2014 Elsevier Ltd. Increase in seawater pCO2 and the corresponding decrease in pH caused by the increasing atmospheric CO2 concentration (i.e., ocean acidification) may affect organic matter production by phytoplankton communities. Organic matte...
R. Sohrin, K. Imanishi, Y. Suzuki, K. Kuma, I. Yasuda, K. Suzuki, T. Nakatsuka
Progress in Oceanography   126 168-179   Aug 2014   [Refereed]
The Okhotsk Sea is considered the only ventilation source area for North Pacific Intermediate Water (NPIW), which is widely distributed in the low and middle latitudes of the North Pacific. Previous studies have confirmed high levels of dissolved ...
K. Suzuki, K. Suzuki, A. Hattori-Saito, Y. Sekiguchi, J. Nishioka, M. Shigemitsu, T. Isada, H. Liu, R. M L McKay
Biogeosciences   11 2503-2517   May 2014
The Sea of Okhotsk is known as one of the most biologically productive regions among the world's oceans, and its productivity is supported in part by the discharge of iron (Fe)-rich water from the Amur River. However, little is known about the eff...
Yuki Sato-Takabe, Koji Hamasaki, Koji Suzuki, Koji Suzuki
Microbes and Environments   29 100-103   Apr 2014
This paper describes the photosynthetic response of a Roseobacter strain of marine aerobic anoxygenic phototrophic bacteria to an organic substrate limitation. In batch cultures, higher values of the spheroidenone/bacteriochlorophyll a ratio were ...
A. Fujiwara, A. Fujiwara, T. Hirawake, K. Suzuki, I. Imai, S. I. Saitoh
Biogeosciences   11 1705-1716   Apr 2014
This study assesses the response of phytoplankton assemblages to recent climate change, especially with regard to the shrinking of sea ice in the northern Chukchi Sea of the western Arctic Ocean. Distribution patterns of phytoplankton groups in th...
Yuichi Nosaka, Tomonori Isada, Tomonori Isada, Isao Kudo, Hiroaki Saito, Hiroshi Hattori, Atsushi Tsuda, Koji Suzuki, Koji Suzuki, Koji Suzuki
Journal of Oceanography   70 91-103   Feb 2014
We investigated the water-column light utilization efficiency (Ψ) of phytoplankton photosynthesis in the Western Subarctic Gyre (WSG) of the North Pacific during summer 2008. The Ψ values (0.64-1.86 g C [g Chl a]-1 [mol photon]-1 m2) obtained were...
Sohiko Kameyama, Satoshi Yoshida, Hiroshi Tanimoto, Satoshi Inomata, Koji Suzuki, Hisayuki Yoshikawa-Inoue
Journal of Oceanography   70 225-239   Jan 2014
We measured dissolved isoprene (2-methyl-1,3-butadiene; C5H8) concentrations in a broad area of the southern Indian Ocean and in the Indian sector of the Southern Ocean from 35°S to 64°S and from 37°E to 111°E during austral summer 2010-2011. Isop...
Shintaro Takao, Shintaro Takao, Takahiro Iida, Tomonori Isada, Tomonori Isada, Sei Ichi Saitoh, Takafumi Hirata, Takafumi Hirata, Koji Suzuki, Koji Suzuki, Koji Suzuki
Progress in Oceanography   126 233-241   Jan 2014
The Sea of Okhotsk is one of the most productive ocean regions in the world. However, the in situ bio-optical properties, which are crucial for satellite ocean-color of the productivity, remain uncertain in this region because little data have bee...
Takao Shintaro, Hirawake Toru, Hashida Gen, Sasaki Hiroshi, Hattori Hiroshi, Suzuki Koji
Polar Biology   37(11) 1563-1578   2014   [Refereed]
T. Hirata, T. Hirawake, F. Sakaida, H. Yamaguchi, K. Suzuki, H. Murakami, J. Ishizaka, H. Kobayashi, A. Fujiwara, M. Toratani, S.-I. Saitoh
Journal of the Remote Sensing Society of Japan   34(4) 278-285   2014   [Refereed]
Yuko Omori, Hiroshi Tanimoto, Satoshi Inomata, Sohiko Kameyama, Sohiko Kameyama, Shintaro Takao, Koji Suzuki, Koji Suzuki
Limnology and Oceanography: Methods   11 549-560   Nov 2013
New, highly time-resolved techniques for measuring dimethyl sulfide (DMS) concentrations in seawater provide the opportunity to greatly increase the size of the DMS concentration database. However, lack of community-level quality control raises co...
Y. Yamashita, Y. Yamashita, Y. Nosaka, K. Suzuki, K. Suzuki, H. Ogawa, K. Takahashi, H. Saito
Biogeosciences   10 7207-7217   Nov 2013
Chromophoric dissolved organic matter (CDOM) ubiquitously occurs in marine environments and plays a significant role in the marine biogeochemical cycles. Basin scale distributions of CDOM have recently been surveyed in the global ocean and indicat...
Hongmei Jing, Hongmei Jing, Xiaomin Xia, Koji Suzuki, Hongbin Liu
PLOS ONE   8    Nov 2013
Community composition of Bacteria in the surface and deep water layers were examined at three oceanic sites in the Pacific Ocean separated by great distance, i.e., the South China Sea (SCS) in the western tropical Pacific, the Costa Rica Dome (CRD...
K. Sugie, K. Sugie, H. Endo, K. Suzuki, K. Suzuki, J. Nishioka, H. Kiyosawa, T. Yoshimura
Biogeosciences   10 6309-6321   Oct 2013
Little is known concerning the effect of CO2 on phytoplankton ecophysiological processes under nutrient and trace element-limited conditions, because most CO2 manipulation experiments have been conducted under elements-replete conditions. To inves...
Sohiko Kameyama, Sohiko Kameyama, Hiroshi Tanimoto, Satoshi Inomata, Hisayuki Yoshikawa-Inoue, Urumu Tsunogai, Atsushi Tsuda, Mitsuo Uematsu, Masao Ishii, Daisuke Sasano, Koji Suzuki, Yuichi Nosaka
Geophysical Research Letters   40 3986-3990   Aug 2013
Although much attention has been paid to describing the distribution of oceanic dimethyl sulfide (DMS) concentrations, establishing robust relationships between DMS concentrations and biological, physical, and chemical variables is still challengi...
Takeshi Yoshimura, Koji Suzuki, Hiroshi Kiyosawa, Tsuneo Ono, Hiroshi Hattori, Kenshi Kuma, Jun Nishioka
Journal of Oceanography   69 601-618   Aug 2013
Response of phytoplankton to increasing CO2 in seawater in terms of physiology and ecology is key to predicting changes in marine ecosystems. However, responses of natural plankton communities especially in the open ocean to higher CO2 levels have...
J. Peloquin, C. Swan, N. Gruber, M. Vogt, H. Claustre, H. Claustre, J. Ras, J. Ras, J. Uitz, J. Uitz, R. Barlow, R. Barlow, M. Behrenfeld, R. Bidigare, H. Dierssen, G. Ditullio, E. Fernandez, C. Gallienne, S. Gibb, R. Goericke, L. Harding, E. Head, P. Holligan, S. Hooker, D. Karl, M. Landry, R. Letelier, C. A. Llewellyn, M. Lomas, M. Lucas, A. Mannino, J. C. Marty, J. C. Marty, B. G. Mitchell, F. Muller-Karger, N. Nelson, C. O'Brien, B. Prezelin, D. Repeta, W. O. Smith, D. Smythe-Wright, R. Stumpf, A. Subramaniam, K. Suzuki, C. Trees, M. Vernet, N. Wasmund, S. Wright
Earth System Science Data   5 109-123   Mar 2013   [Refereed]
A global pigment database consisting of 35 634 pigment suites measured by high performance liquid chromatography was assembled in support of the MARine Ecosytem DATa (MAREDAT) initiative. These data originate from 136 field surveys within the glob...
Tomonori Isada, Tomonori Isada, Takahiro Iida, Hongbin Liu, Sei Ichi Saitoh, Jun Nishioka, Jun Nishioka, Takeshi Nakatsuka, Koji Suzuki, Koji Suzuki, Koji Suzuki
Journal of Geophysical Research: Oceans   118 1995-2013   Jan 2013
We investigated the photosynthetic parameters of phytoplankton in the Sea of Okhotsk during the late summer of 2006 to characterize their spatiotemporal variability and to test the hypothesis that discharge from the Amur River could influence the ...
Yoshiko Kondo, Yoshiko Kondo, Shigenobu Takeda, Shigenobu Takeda, Jun Nishioka, Mitsuhide Sato, Hiroaki Saito, Koji Suzuki, Ken Furuya
Journal of Oceanography   69 97-115   Jan 2013
The influence of organic ligands on natural phytoplankton growth was investigated in high-nitrate low-chlorophyll (HNLC) waters and during a phytoplankton bloom induced by a mesoscale iron enrichment experiment (SEEDS II) in the western subarctic ...
H. Endo, T. Yoshimura, T. Kataoka, T. Kataoka, K. Suzuki, K. Suzuki
Journal of Experimental Marine Biology and Ecology   439 160-175   Jan 2013
On-deck CO2-Fe-manipulated incubation experiments were conducted using surface seawater collected from the Western Subarctic Gyre of the NW Pacific in the summer of 2008 to elucidate the impacts of ocean acidification and Fe enrichment on the abun...
S. Takao, T. Hirawake, S. W. Wright, S. W. Wright, K. Suzuki, K. Suzuki, K. Suzuki
Biogeosciences   9 3875-3890   Oct 2012
Phytoplankton population dynamics play an important role in biogeochemical cycles in the Southern Ocean during austral summer. Recent environmental changes such as a rise in sea surface temperature (SST) are likely to impact on net primary product...
Sato Takabe Yuki, Sato Takabe Yuki, Koji Hamasaki, Koji Suzuki, Koji Suzuki
Archives of Microbiology   194 331-341   May 2012
A coastal Roseobacter strain of marine aerobic anoxygenic phototrophic bacteria (AAnPB) was isolated and phylogenetically determined. The strain OBYS 0001 was characterized by its physiological and biochemical properties with reference to the Eryt...
A. Fujiwara, T. Hirawake, K. Suzuki, S. I. Saitoh
Biogeosciences   8 3567-3580   Dec 2011
Recent ocean warming and subsequent sea ice decline resulting from climate change could affect the northward shift of the ecosystem structure in the Chukchi Sea and Bering Sea shelf region (Grebmeier et al., 2006b). The size structure of phytoplan...
Sohiko Kameyama, Sohiko Kameyama, Hiroshi Tanimoto, Satoshi Inomata, Koji Suzuki, Daisuke D. Komatsu, Akinari Hirota, Uta Konno, Urumu Tsunogai
Geochemical Journal   45 355-363   Dec 2011
Emission of trace gases from the marine diatom Thalassiosira pseudonana (CCMP1335) was continuously monitored with a proton transfer reaction-mass spectrometry (PTR-MS) in an axenic batch culture system under a 13:11-h light:dark cycle. Substantia...
Yuki Sato-Takabe, Yuki Sato-Takabe, Koji Hamasaki, Koji Suzuki, Koji Suzuki
Archives of Microbiology   1   Nov 2011
Koji Suzuki, Akira Kuwata, Naoki Yoshie, Naoki Yoshie, Akira Shibata, Akira Shibata, Kyoko Kawanobe, Hiroaki Saito
Deep-Sea Research Part I: Oceanographic Research Papers   58 575-589   May 2011
We characterized the community composition of phytoplankton in the western subarctic Pacific from the pre-bloom to the decline phase of the spring bloom with special reference to decreases in the silicic acid concentration in surface waters as an ...
Satomi Ushizaka, Kenshi Kuma, Kenshi Kuma, Koji Suzuki, Koji Suzuki
Fisheries Science   77(3) 411-424   May 2011   [Refereed]
The significance of Mn and Fe for the growth of the coastal marine diatom Thalassiosira weissflogii was investigated by culture experiments in the presence of precipitated Fe(III) hydroxide [am-Fe(III)] and EDTA-Fe(III) complex with or without Mn ...
Koji Sugie, Koji Sugie, Kenshi Kuma, Kenshi Kuma, Satoshi Fujita, Satomi Ushizaka, Koji Suzuki, Koji Suzuki, Tsutomu Ikeda
Journal of Oceanography   67 183-196   Apr 2011
We report on the ability for luxury Fe uptake and the potential for growth utilizing intracellular Fe pools for 4 coastal centric diatom isolates and in situ phytoplankton assemblages, mainly composed of diatoms. Iron uptake of the diatom isolates...
T. Hirata, T. Hirata, T. Hirata, T. Hirata, N. J. Hardman-Mountford, N. J. Hardman-Mountford, R. J W Brewin, R. J W Brewin, J. Aiken, R. Barlow, R. Barlow, K. Suzuki, T. Isada, E. Howell, T. Hashioka, T. Hashioka, M. Noguchi-Aita, M. Noguchi-Aita, Y. Yamanaka, Y. Yamanaka, Y. Yamanaka
Biogeosciences   8 311-327   Feb 2011
Error-quantified, synoptic-scale relationships between chlorophyll-a (Chl-a) and phytoplankton pigment groups at the sea surface are presented. A total of ten pigment groups were considered to represent three Phytoplankton Size Classes (PSCs, micr...
Osamu Yoshida, Osamu Yoshida, Hisayuki Y. Inoue, Shuichi Watanabe, Koji Suzuki, Shinichiro Noriki
Journal of Geophysical Research: Oceans   116    Jan 2011
Oceanic methane (CH4) was examined in the South Pacific and the Southern Ocean from December 2001 to February 2002. From the oligotrophic South Pacific (10S) to the Subtropical Front (STF), we observed the maximum concentrations of CH4 in the subs...
Atsushi Tsuda, Kimio Fukami, Hiroshi Kiyosawa, Koji Suzuki, Shigenobu Takeda, Shigenobu Takeda, Jun Nishioka, Jun Nishioka, Masayuki Takahashi, Keith Johnson, Chi Shing Wong
Plankton and Benthos Research   5(4) 144-155   Dec 2010   [Refereed]
The roles of heterotrophic organisms (microzooplankton, mesozooplankton, bacteria and heterotrophic nanoflagellates) were examined during a nutrient enrichment experiment using a mesocosm in Saanich Inlet, British Columbia, Canada. Grazing rates o...
Takeshi Yoshimura, Jun Nishioka, Koji Suzuki, Hiroshi Hattori, Hiroshi Kiyosawa, Yutaka W. Watanabe
Journal of Experimental Marine Biology and Ecology   395 191-198   Nov 2010
Increasing CO2 in seawater (i.e. ocean acidification) may have various and potentially adverse effects on phytoplankton dynamics and hence the organic carbon dynamics. We conducted a CO2 manipulation experiment in the Sea of Okhotsk in summer 2006...
Hongmei Jing, Hongbin Liu, Koji Suzuki, Rumi Sohrin, Jun Nishioka
Aquatic Microbial Ecology   61 191-204   Oct 2010   [Refereed]
We investigated spatial variations of the bacterial and archaeal community composition in surface waters of the Sea of Okhotsk during summer of 2006, using denaturing gradient gel electrophoresis (DGGE). We determined phylogenetic assemblages, inc...
Tomonori Isada, Ai Hattori-Saito, Hiroaki Saito, Tsutomu Ikeda, Koji Suzuki, Koji Suzuki
Deep-Sea Research Part II: Topical Studies in Oceanography   57 1653-1664   Sep 2010
Despite large diatom blooms occurring in the Oyashio region of the NW Pacific every spring, our knowledge of factors controlling primary productivity in the region during that season remains incomplete. Therefore, we investigated phytoplankton abu...
U. Konno, U. Tsunogai, D. D. Komatsu, S. Daita, F. Nakagawa, A. Tsuda, T. Matsui, Y. J. Eum, K. Suzuki
Biogeosciences   7 2369-2377   Aug 2010
Using the 15N2 tracer method and high-sensitivity &delta;15N analytical systems, we determined N2 fixation rates for ocean samples by dividing them into particulate (>0.7 μm) and filtrate (<0.7 μm) fractions. While N2 fixation in the filtrate frac...
Hongbin Liu, Hongbin Liu, Mianrun Chen, Koji Suzuki, Chong Kim Wong, Bingzhang Chen
Marine Ecology Progress Series   407 111-123   May 2010
Phytoplankton community composition and mesozooplankton selective feeding on different phytoplankton taxa were studied by HPLC pigment analysis at 2 sites with contrasting hydrography in the coastal areas of Hong Kong. The site (WE) on the western...
M. K. Kurihara, M. Kimura, Y. Iwamoto, Y. Narita, A. Ooki, Y. J. Eum, A. Tsuda, K. Suzuki, Y. Tani, Y. Yokouchi, M. Uematsu, S. Hashimoto
Marine Chemistry   118 156-170   Feb 2010
Biogenic trace gases, especially halomethanes, which are important with respect to atmospheric chemistry, are released from the ocean and carry halogens to the troposphere and stratosphere. The concentrations of 10 halocarbons and isoprene in seaw...
Naoki Yoshie, Naoki Yoshie, Naoki Yoshie, Koji Suzuki, Akira Kuwata, Jun Nishioka, Hiroaki Saito
Marine Ecology Progress Series   399 39-52   Feb 2010
Variations in photosynthetic parameters of phytoplankton during the spring bloom were investigated in the western subarctic Pacific. Light-saturated maximum photosynthesis rate (PB max) and light-limited slope (αB) in the photosynthesis-irradiance...
Ai Hattori-Saito, Jun Nishioka, Jun Nishioka, Tsuneo Ono, R. Michael L McKay, Koji Suzuki, Koji Suzuki
Journal of Oceanography   66 105-115   Jan 2010
In order to detect iron (Fe) stress in micro-sized (20-200 μm) diatoms in the Oyashio region, western subarctic Pacific during spring, immunological ferredoxin/flavodoxin assays were applied to samples collected from the surface layer in May 2005....
Takafumi Kataoka, Koji Suzuki, Koji Suzuki, Maki Hayakawa, Isao Kudo, Seigo Higashi, Seigo Higashi, Atsushi Tsuda
Deep-Sea Research Part II: Topical Studies in Oceanography   56 2779-2787   Dec 2009
Little is known about the effects of iron enrichment in high-nitrate low-chlorophyll (HNLC) waters on the community composition of heterotrophic bacteria, which are crucial to nutrient recycling and microbial food webs. Using denaturing gradient g...
Ippei Nagao, Shinya Hashimoto, Koji Suzuki, Shuji Toda, Yasushi Narita, Atsushi Tsuda, Hiroaki Saito, Isao Kudo, Shungo Kato, Yoshizumi Kajii, Mitsuo Uematsu
Deep-Sea Research Part II: Topical Studies in Oceanography   56 2899-2917   Dec 2009
Simultaneous measurements of dimethylsulfide (DMS) in the seawater and atmosphere were conducted during SEEDS-II to investigate the responses of DMS to iron (Fe) fertilization in the subarctic North Pacific. No significant increases in the seawate...
Shinya Hashimoto, Shuji Toda, Koji Suzuki, Shungo Kato, Yasusi Narita, Michiko K. Kurihara, Yoko Akatsuka, Hiroshi Oda, Takahiro Nagai, Ippei Nagao, Isao Kudo, Mitsuo Uematsu
Deep-Sea Research Part II: Topical Studies in Oceanography   56 2928-2935   Dec 2009
Iron could play a key role in controlling phytoplankton biomass and productivity in high-nutrient, low-chlorophyll regions. As a part of the iron fertilization experiment carried out in the western subarctic Pacific from July to August 2004 (Subar...
Isao Kudo, Yoshifumi Noiri, William P. Cochlan, Koji Suzuki, Takafumi Aramaki, Tsuneo Ono, Yukihiro Nojiri
Deep-Sea Research Part II: Topical Studies in Oceanography   56 2755-2766   Dec 2009
Primary productivity (PP), bacterial productivity (BP) and the uptake rates of nitrate and ammonium were measured using isotopic methods (13C, 3H, 15N) during a mesoscale iron (Fe)-enrichment experiment conducted in the western subarctic Pacific O...
Martine Lizotte, Maurice Levasseur, Isao Kudo, Koji Suzuki, Atsushi Tsuda, Ronald P. Kiene, Michael G. Scarratt
Deep-Sea Research Part II: Topical Studies in Oceanography   56 2889-2898   Dec 2009
The effect of added iron on bacterial cycling of the climate-active gas dimethylsulfide (DMS) and its precursor dimethylsulfoniopropionate (DMSP) was tested during the second Subarctic Pacific Iron Experiment for Ecosystem Dynamics Study (SEEDS II...
Koji Suzuki, Koji Suzuki, Hiroaki Saito, Tomonori Isada, Ai Hattori-Saito, Hiroshi Kiyosawa, Jun Nishioka, Jun Nishioka, R. Michael L McKay, Akira Kuwata, Atsushi Tsuda
Deep-Sea Research Part II: Topical Studies in Oceanography   56 2733-2744   Dec 2009
Temporal changes in the abundance, community composition, and photosynthetic physiology of phytoplankton in surface waters were investigated during the second in situ iron (Fe) fertilization experiment in the NW subarctic Pacific (SEEDS-II). Surfa...
Hiroaki Saito, Atsushi Tsuda, Yukihiro Nojiri, Takafumi Aramaki, Hiroshi Ogawa, Takeshi Yoshimura, Keiri Imai, Isao Kudo, Jun Nishioka, Tsuneo Ono, Koji Suzuki, Shigenobu Takeda
Deep-Sea Research Part II: Topical Studies in Oceanography   56 2852-2862   Dec 2009
Biogeochemical cycles of N and Si were examined in the surface mixed layer during the mesoscale iron-enrichment (IE) experiment in the high-nutrient low-chlorophyll (HNLC) western subarctic Pacific (SEEDS-II). Although the IEs increased nitrate up...
Tomonori Isada, Akira Kuwata, Hiroaki Saito, Tsuneo Ono, Masao Ishii, Hisayuki Yoshikawa-Inoue, Hisayuki Yoshikawa-Inoue, Koji Suzuki, Koji Suzuki
Journal of Plankton Research   31 1009-1025   Sep 2009
Diel and seasonal changes in the photosynthetic physiology of phytoplankton and primary productivity were investigated during 2005, together with community composition in the Oyashio (OY) and Kuroshio-Oyashio transition (TR) regions of the northwe...
Hongmei Jing, Hongbin Liu, Koji Suzuki
Aquatic Microbial Ecology   56 55-63   Aug 2009
The phylogenetic composition of marine Synechococcus spp. populations from 5 stations, 4 in the Sea of Okhotsk and 1 in the western subarctic Pacific, representing a wide range of hydrographic and ecological conditions, was examined using internal...
Takafumi Kataoka, Yoshikuni Hodoki, Koji Suzuki, Koji Suzuki, Hiroaki Saito, Seigo Higashi, Seigo Higashi
Journal of Photochemistry and Photobiology B: Biology   95 108-116   May 2009
In order to evaluate the effects of solar ultraviolet radiation (UVR) on eubacterial community composition, we examined the tolerance of eubacterial phylotypes to solar UV radiation in surface waters of the western North Pacific during September 2...
Takafumi Kataoka, Yoshikuni Hodoki, Koji Suzuki, Koji Suzuki, Hiroaki Saito, Seigo Higashi, Seigo Higashi
Journal of Marine Systems   77 197-207   Apr 2009
In the western North Pacific, where subarctic Oyashio waters encounter subtropical Kuroshio waters, phylotype composition of heterotrophic bacteria was estimated by denaturing gradient gel electrophoresis (DGGE) of PCR-amplified bacterial 16S ribo...
Hongbin Liu, Koji Suzuki, Jun Nishioka, Rumi Sohrin, Takeshi Nakatsuka
Deep-Sea Research Part I: Oceanographic Research Papers   56 561-570   Apr 2009
The Sea of Okhotsk is one of the most productive marine basins in the world ocean and plays an important role in transport of organic carbon and iron to the western subarctic Pacific. We report the first measurements of phytoplankton growth and mi...
Maki Hayakawa, Koji Suzuki, Koji Suzuki, Hiroaki Saito, Kazutaka Takahashi, Shin ichi Ito
Journal of Experimental Marine Biology and Ecology   360 63-70   Jun 2008
Cell viabilities of phytoplankton in the Oyashio and Kuroshio-Oyashio transition regions of the northwest Pacific Ocean were examined in September 2003 (late summer) and May 2005 (spring) using a membrane permeability test. Specific lysis rates of...
Atsushi Tsuda, Shigenobu Takeda, Hiroaki Saito, Jun Nishioka, Isao Kudo, Yukihiro Nojiri, Koji Suzuki, Mitsuo Uematsu, Mark L. Wells, Daisuke Tsumune, Takeshi Yoshimura, Tatsuo Aono, Takafumi Aramaki, William P. Cochlan, Maki Hayakawa, Keiri Imai, Tomoshi Isada, Yoko Iwamoto, William K. Johnson, Sohiko Kameyama, Shungo Kato, Hiroshi Kiyosawa, Yoshiko Kondo, Maurice Levasseur, Ryuji J. Machida, Ippei Nagao, Fumiko Nakagawa, Takahiro Nakanishi, Seiji Nakatsuka, Akira Narita, Yoshifumi Noiri, Hajime Obata, Hiroshi Ogawa, Kenji Oguma, Tsuneo Ono, Tomofumi Sakuragi, Motoki Sasakawa, Mitsuhide Sato, Akifumi Shimamoto, Hyoe Takata, Charles G. Trick, Yutaka W. Watanabe, Chi Shing Wong, Naoki Yoshie
Journal of Oceanography   63 983-994   Dec 2007
A mesoscale iron-enrichment study (SEEDS II) was carried out in the western subarctic Pacific in the summer of 2004. The iron patch was traced for 26 days, which included observations of the development and the decline of the bloom by mapping with...
Jun Nishioka, Jun Nishioka, Tsuneo Ono, Hiroaki Saito, Takeshi Nakatsuka, Shigenobu Takeda, Takeshi Yoshimura, Koji Suzuki, Kenshi Kuma, Shigeto Nakabayashi, Daisuke Tsumune, Humio Mitsudera, W. Keith Johnson, Atsushi Tsuda
Journal of Geophysical Research: Oceans   112    Oct 2007
Iron is an essential nutrient and plays an important role in the control of phytoplankton growth (Martin et al., 1989). Atmospheric dust has been thought to be the most important source of iron, supporting annual biological production in the weste...
Hiroaki Saito, Atsushi Tsuda, Yukihiro Nojiri, Jun Nishioka, Shigenobu Takeda, Hiroshi Kiyosawa, Isao Kudo, Yoshifumi Noiri, Tsuneo Ono, Yousuke Taira, Koji Suzuki, Takeshi Yoshimura, Philip W. Boyd
Deep-Sea Research Part II: Topical Studies in Oceanography   53 2168-2181   Oct 2006
This paper reports on the variations in nutrient concentrations and phytoplankton dynamics during the stationary and declining phases of a phytoplankton bloom induced by a mesoscale iron-enrichment conducted in the high-nutrient low-chlorophyll (H...
Shouei Iwade, Kenshi Kuma, Kenshi Kuma, Yutaka Isoda, Masahiko Yoshida, Isao Kudo, Isao Kudo, Jun Nishioka, Jun Nishioka, Koji Suzuki, Koji Suzuki
Aquatic Microbial Ecology   43 177-191   Jun 2006
The growth and iron uptake of the coastal marine diatom Chaetoceros sociale were experimentally measured in batch experiments at 10°C to which an acidic Fe(III) stock solution was added. The direct input of Fe(III) into the culture media induced t...
Hiroaki Saito, Takashi Ota, Koji Suzuki, Jun Nishioka, Atsushi Tsuda
Geophysical Research Letters   33    May 2006
Iron enrichment to high-nutrient low-chlorophyll (HNLC) regions is being considered as a possible way of atmospheric CO2 sequestration to the deep sea. Mesoscale iron-enrichment to the HNLC subarctic Pacific induced a massive diatom bloom and led ...
Toshihiro Usui, Seiya Nagao, Masanobu Yamamoto, Koji Suzuki, Isao Kudo, Shigeru Montani, Atsushi Noda, Masao Minagawa
Marine Chemistry   98 241-259   Feb 2006
Organic carbon (C) and total nitrogen (N) contents and corresponding isotope ratios were determined in surficial sediment (0-3 cm) at 94 stations ranging from 21 to 1995 m water depth off Tokachi, Hokkaido, Japan, to elucidate the distribution and...
Koji Suzuki, Akira Hinuma, Hiroaki Saito, Hiroshi Kiyosawa, Hongbin Liu, Toshiro Saino, Toshiro Saino, Atsushi Tsuda
Progress in Oceanography   64 167-187   Feb 2005
To verify the hypothesis that the growth of phytoplankton in the Western Subarctic Gyre (WSG), which is located in the northwest subarctic Pacific, is suppressed by low iron (Fe) availability, an in situ Fe fertilization experiment was carried out...
Hiroaki Saito, Koji Suzuki, Akira Hinuma, Takashi Ota, Kimio Fukami, Hiroshi Kiyosawa, Toshiro Saino, Atsushi Tsuda
Progress in Oceanography   64 223-236   Feb 2005
Microzooplankton grazing plays an important role in maintaining the phytoplankton biomass low in HNLC waters where iron depletion limits the phytoplankton growth. When the iron limitation is relieved by natural iron supply or manipulation, phytopl...
Hongbin Liu, Koji Suzuki, Hiroaki Saito
Journal of Oceanography   60 119-137   Feb 2004
The phytoplankton community in the western subarctic Pacific (WSP) is composed mostly of pico- and nanophytoplankton. Chlorophyll a (Chl a) in the <2 μm size fraction accounted for more than half of the total Chl a in all seasons, with higher cont...
Hiroshi Kitazato, Hiroshi Kitazato, Takeshi Nakatsuka, Motohiro Shimanaga, Jota Kanda, Wonn Soh, Yoshihisa Kato, Yoshihiro Okada, Akio Yamaoka, Toshiyuki Masuzawa, Koji Suzuki, Yoshihisa Shirayama
Progress in Oceanography   57 3-16   Jun 2003
Deep-sea benthic ecosystems are mainly sustained by sinking organic materials that are produced in the euphotic zone. "Benthic-pelagic coupling" is the key to understanding both material cycles and benthic ecology in deep-sea environments, in part...
Atsushi Tsuda, Atsushi Tsuda, Shigenobu Takeda, Hiroaki Saito, Jun Nishioka, Yukihiro Nojiri, Isao Kudo, Hiroshi Kiyosawa, Akihiro Shiomoto, Keiri Imai, Keiri Imai, Tsuneo Ono, Akifumi Shimamoto, Daisuke Tsumune, Takeshi Yoshimura, Tatsuo Aono, Akira Hinuma, Masatoshi Kinugasa, Koji Suzuki, Yoshiki Sohrin, Yoshifumi Noiri, Heihachiro Tani, Yuji Deguchi, Nobuo Tsurushima, Hiroshi Ogawa, Kimio Fukami, Kenshi Kuma, Toshiro Saino, Toshiro Saino
Science   300 958-961   May 2003
We have performed an in situ test of the iron limitation hypothesis in the subarctic North Pacific Ocean. A single enrichment of dissolved iron caused a large increase in phytoplankton standing stock and decreases in macronutrients and dissolved c...
Yoshihisa Mino, Toshiro Saino, Toshiro Saino, Koji Suzuki, Emilio Maranón
Global Biogeochemical Cycles   16 7-1   Dec 2002
Isotopic composition of suspended particulate nitrogen (δ15Nsus) has been studied in near-surface waters along a transect extending from 50°N to 50°S in the Atlantic Ocean. The δ15Nsus values ranged from -0.8 to +5.4‰ and showed a significant corr...
Koji Suzuki, Chie Minami, Hongbin Liu, Toshiro Saino
Deep-Sea Research Part II: Topical Studies in Oceanography   49 5685-5704   Nov 2002
The distribution and community structure of phytoplankton were investigated in the subarctic Pacific and the Bering Sea during summer 1999 using chemotaxonomic pigment markers analyzed by HPLC and the CHEMTAX program (Mar. Ecol. Prog. Ser. 144 (19...
Hongbin Liu, Keiri Imai, Koji Suzuki, Yukihiro Nojiri, Nobuo Tsurushima, Toshiro Saino
Deep-Sea Research Part II: Topical Studies in Oceanography   49 5409-5420   Nov 2002
Picoplankton community structure in the upper 200 m at Station KNOT in the western subarctic North Pacific was studied by flow cytometric analysis of the time-series samples collected from June 1998 through June 2000. Phototrophic picoplankton, Sy...
Koji Suzuki, Koji Suzuki, Hongbin Liu, Toshiro Saino, Hajime Obata, Michiaki Takano, Kei Okamura, Yoshiki Sohrin, Yukiyo Fujishima
Limnology and Oceanography   47 1581-1594   Nov 2002
In the subarctic Pacific and its adjacent waters, the photochemical quantum yield (Fv/Fm) and the functional absorption cross section (σPSII) of photosystem II for surface phytoplankton were continuously measured during the early summer of 1999 us...
Hongbin Liu, Koji Suzuki, Chie Minami, Toshiro Saino, Masataka Watanabe
Marine Ecology Progress Series   237 1-14   Jul 2002
We studied picoplankton community structures in the subarctic Pacific Ocean and the Bering Sea during summer 1999 using flow cytometric analysis. The picoplankton community in the studied area was comprised of Synechococcus spp., eukaryotic ultrap...
Koji Suzuki, Atsushi Tsuda, Hiroshi Kiyosawa, Shigenobu Takeda, Jun Nishioka, Toshiro Saino, Masayuki Takahashi, C. S. Wong
Journal of Experimental Marine Biology and Ecology   271 99-120   May 2002
To investigate the impact of microzooplankton grazing on phytoplankton bloom in coastal waters, an enclosure experiment was conducted in Saanich Inlet, Canada during the summer of 1996. Daily changes in the microzooplankton grazing rate on each ph...
Hongbin Liu, Hongbin Liu, Koji Suzuki, Toshiro Saino
Deep-Sea Research Part I: Oceanographic Research Papers   49 363-375   Feb 2002
Phytoplankton growth and microzooplankton grazing rates were measured by the dilution technique in the subarctic North Pacific Ocean along a west-east transect during summer 1999. Average phytoplankton growth rates without added nutrients (μ0) wer...
Yumiko Obayashi, Eiichiro Tanoue, Koji Suzuki, Nobuhiko Handa, Yukihiro Nojiri, Chi Shing Wong
Deep-Sea Research Part I: Oceanographic Research Papers   48 439-469   Jan 2001
Particulate matter in surface waters of the northern North Pacific and the southern Bering Sea was analyzed for the spatial and temporal distribution of chlorophyll and carotenoid pigment compositions by high-performance liquid chromatography (HPL...

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日本化学会編
2007