Tanaka Atsuko

写真a

Title

Instructor
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Current Affiliation Organization 【 display / non-display 】

  • Duty   University of the Ryukyus   Faculty of Science   Chemistry, Biology and Marine Science   Instructor  

  • Concurrently   University of the Ryukyus   Graduate School of Engineering and Science   Chemistry, Biology and Marine Science   Assistant Professor  

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External Career 【 display / non-display 】

  • 2016.10
    　
    　

    University of the Ryukyus, Faculty of Science, Department of Chemistry, Biology, and Marine Science, Instructor  

  • 2013.06
    -
    2016.09

     

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Published Papers 【 display / non-display 】

  • Systematics, distribution, and sexual compatibility of six Scytosiphon species (Scytosiphonaceae, Phaeophyceae) from Japan and the description of four new species

    Masakazu Hoshino, Atsuko Tanaka, Mitsunobu Kamiya, Shinya Uwai, Masanori Hiraoka, Kazuhiro Kogame

    Journal of Phycology ( Wiley )  57 ( 2 ) 416 - 434   2021.04 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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  • Community-Level Responses to Iron Availability in Open Ocean Plankton Ecosystems

    Luigi Caputi, Quentin Carradec, Damien Eveillard, Amos Kirilovsky, Eric Pelletier, Juan J. Pierella Karlusich, Fabio Rocha Jimenez Vieira, Emilie Villar, Samuel Chaffron, Shruti Malviya, Eleonora Scalco, Silvia G. Acinas, Adriana Alberti, Jean-Marc Aury, Anne-Sophie Benoiston, Alexis Bertrand, Tristan Biard, Lucie Bittner, Martine Boccara, Jennifer R. Brum, Christophe Brunet, Greta Busseni, Anna Carratala, Herve Claustre, Luis Pedro Coelho, Sbastien Colin, Salvatore D'Aniello, Corinne Da Silva, Marianna Del Core, Hugo Dore, Stephane Gasparini, Florian Kokoszka, Jean-Louis Jamet, Christophe Lejeusne, Cyrille Lepoivre, Magali Lescot, Gipsi Lima-Mendez, Fabien Lombard, Julius Lukes, Nicolas Maillet, Mohammed-Amin Madoui, Elodie Martinez, Maria Grazia Mazzocchi, Mario B. Neou, Javier Paz-Yepes, Julie Poulain, Simon Ramondenc, Jean-Baptiste Romagnan, Simon Roux, Daniela Salvagio Manta, Remo Sanges, Sabrina Speich, Mario Sprovieri, Shinichi Sunagawa, Vincent Taillandier, Atsuko Tanaka, Leila Tirichine, Camille Trottier, Julia Uitz, Alaguraj Veluchamy, Jana Vesela, Flora Vincent, Sheree Yau, Stefanie Kandels-Lewis, Sarah Searson, Cline Dimier, Marc Picheral, Peer Bork, Emmanuel Boss, Colomban De Vargas, Michael J. Follows, Nigel Grimsley, Lionel Guidi, Pascal Hingamp, Eric Karsenti, Paolo Sordino, Lars Stemmann, Matthew B. Sullivan, Alessandro Tagliabue, Adriana Zingone, Laurence Garczarek, Fabrizio d'Ortenzio, Pierre Testor, Fabrice Not, Maurizio Ribera d'Alcala, Patrick Wincker, Chris Bowler, Daniele Iudicone, Gabriel Gorsky, Olivier Jaillon, Lee Karp-Boss, Uros Krzic, Hiroyuki Ogata, Stephane Pesant, Jeroen Raes, Emmanuel G. Reynaud, Christian Sardet, Mike Sieracki, Didier Velayoudon, Jean Weissenbach

    GLOBAL BIOGEOCHEMICAL CYCLES ( AMER GEOPHYSICAL UNION )  33 ( 3 ) 391 - 419   2019.03 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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    Predicting responses of plankton to variations in essential nutrients is hampered by limited in situ measurements, a poor understanding of community composition, and the lack of reference gene catalogs for key taxa. Iron is a key driver of plankton dynamics and, therefore, of global biogeochemical cycles and climate. To assess the impact of iron availability on plankton communities, we explored the comprehensive bio-oceanographic and bio-omics data sets from Tara Oceans in the context of the iron products from two state-of-the-art global scale biogeochemical models. We obtained novel information about adaptation and acclimation toward iron in a range of phytoplankton, including picocyanobacteria and diatoms, and identified whole subcommunities covarying with iron. Many of the observed global patterns were recapitulated in the Marquesas archipelago, where frequent plankton blooms are believed to be caused by natural iron fertilization, although they are not captured in large-scale biogeochemical models. This work provides a proof of concept that integrative analyses, spanning from genes to ecosystems and viruses to zooplankton, can disentangle the complexity of plankton communities and can lead to more accurate formulations of resource bioavailability in biogeochemical models, thus improving our understanding of plankton resilience in a changing environment.Plain Language Summary Marine phytoplankton require iron for their growth and proliferation. According to John Martin's iron hypothesis, fertilizing the ocean with iron could dramatically increase photosynthetic activity, thus representing a biological means to counteract global warming. However, while there is a constantly growing knowledge of how iron is distributed in the ocean and about its role in cellular processes in marine photosynthetic groups such as diatoms and cyanobacteria, less is known about how iron availability shapes plankton communities and how they respond to it. In the present work, we exploited recently published Tara Oceans data sets to address these questions. We first defined specific subcommunities of co-occurring organisms that co-vary with iron availability in the oceans. We then identified specific patterns of adaptation and acclimation to iron in different groups of phytoplankton. Finally, we validated our global results at local scale, specifically in the Marquesas archipelago, where recurrent phytoplankton blooms arc believed to be a result of iron fertilization. By integrating global data with a localized response, we provide a framework for understanding the resilience of plankton ecosystems in a changing environment.

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  • Asexual reproduction of the marine green alga Struvea okamurae

    Yusuke Horinouchi, Akihiro Dozono, Atsuko Tanaka, Tatsuya Togashi

    Marine Biosystems Research   33   2 - 7   2019

    Type of publication: Research paper (other science council materials etc.)

  • Branch regeneration induced by sever damage in the brown alga Dictyota dichotoma (dictyotales, phaeophyceae).

    Tanaka A, Hoshino Y, Nagasato C, Motomura T

    Protoplasma ( Protoplasma )  254 ( 3 ) 1341 - 1351   2017.05 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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    Tissue wounds are mainly caused by herbivory, which is a serious threat for macro-algae, and brown algae are known to regenerate branches or buds in response to wounding. In the present paper, we describe a branch regeneration system, induced by sever damage, in the brown alga Dictyota dichotoma. Segmentations of juvenile thalli induced branch regenerations unless explants possessed apical cells. Apical excisions in distinct positions elucidated that disruption of an apical cell or disconnection of tissue with an apical cell triggered the branch regeneration. Furthermore, spatial positions of regenerated branches seemed to be regulated by the apical region, which was assumed to generate inhibitory effects for lateral branch regeneration. Mechanical incision, which disrupted tissue continuity with the apical region, induced branch regeneration preferentially below the incision. Although we were unable to identify the candidate inhibitory substance, our results suggested that the apical region may have an inhibitory effect on lateral branch regeneration. Additionally, observations of branch regeneration showed that all epidermal cells in D. dichotoma possess the ability to differentiate into apical cells, directly. This may be the first report of algal transdifferentiation during the wound-stress response.

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  • Intercellular translocation of molecules via plasmodesmata in the multiseriate filamentous brown alga, Halopteris congesta (Sphacelariales, Phaeophyceae).

    Nagasato C, Tanaka A, Ito T, Katsaros C, Motomura T

    Journal of phycology ( Journal of Phycology )  53 ( 2 ) 333 - 341   2017.04 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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    Despite the high number of studies on the fine structure of brown algal cells, only limited information is available on the intercelluar transportation of molecules via plasmodesmata in brown algae. In this study, plasmodesmatal permeability of Halopteris congesta was examined by observing the translocation of microinjected fluorescent tracers of different molecular sizes. The tip region of H. congesta consists of a cylindrical apical cell, while the basal region is multiseriate. Fluorescein isothiocyanate-dextran (FD; 3, 10, and 20 kDa) and recombinant green fluorescent protein (27 kDa) were injected into the apical cell and were observed to diffuse into the neighboring cells. FD of 40 kDa was detected only in the injected apical cell. The plasmodesmatal size exclusion limit was considered to be more than 20 kDa and less than 40 kDa. The extent of translocation of 3 and 10 kDa FD from the apical to neighboring cells 2 h postinjection was estimated based on the fluorescence intensity. It was suggested that the diffusing capacity of plasmodesmata varied according to molecular size. In order to examine acropetal and/or basipetal direction of molecular movement, 3 and 10 kDa FD were injected into the third cell from the apical cell. Successive observations indicated that the diffusion of fluorescence in the acropetal direction took longer than that in the basipetal direction. No ultrastructural difference in plasmodesmata was noted among the cross walls.

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