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Community composition and photophysiology of phytoplankton assemblages in coastal Oyashio waters of the western North Pacific during early spring

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    SYSNO ASEP0498680
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleCommunity composition and photophysiology of phytoplankton assemblages in coastal Oyashio waters of the western North Pacific during early spring
    Author(s) Yoshida, K. (JP)
    Endo, H. (JP)
    Lawrenz, Evelyn (MBU-M) RID
    Isada, T. (JP)
    Hooker, S.B. (US)
    Prášil, Ondřej (MBU-M) RID, ORCID
    Suzuki, K. (JP)
    Source TitleEstuarine Coastal and Shelf Science. - : Elsevier - ISSN 0272-7714
    Roč. 212, NOV15 (2018), s. 80-94
    Number of pages15 s.
    Languageeng - English
    CountryGB - United Kingdom
    KeywordsCoastal Oyashio ; Spring diatom bloom ; P-E curve
    Subject RIVEE - Microbiology, Virology
    OECD categoryMicrobiology
    R&D ProjectsED2.1.00/03.0110 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    LO1416 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    Institutional supportMBU-M - RVO:61388971
    UT WOS000446286100009
    EID SCOPUS85049484915
    DOI10.1016/j.ecss.2018.06.018
    AnnotationGlobally, the western subarctic Pacific is known as the region with the largest seasonal drawdown in the partial pressure of CO2 due to biological activity, i.e., high spring primary production and particulate organic carbon flux. These distinctive features are mainly caused by intense spring diatom blooms in coastal Oyashio (COY) and Oyashio (OY) waters. Although phytoplankton assemblages in OY waters are rather well studied, little is known about COY waters. In this study, photophysiological properties and phytoplankton community composition in COY waters were investigated during the pre-bloom and bloom periods from March to April 2015. Next-generation sequencing targeting the 18S rRNA gene revealed that the diatom Thalassiosira generally dominated the phytoplankton community and showed distinct differences in the diatom communities in shelf and offshore waters of the COY. Additionally, the relative contribution of Thalassiosira to the total diatom assemblages showed a positive correlation with maximum photosynthetic rates (P-max(B)) occurring throughout this study. Chlorophyll a concentration and primary productivity were also positively correlated with sea surface temperature, suggesting that temperature was a critical factor for bloom development. Short-term on-deck incubation experiments were carried out to examine the role of temperature in determining planktonic photosynthetic processes. Our results showed an increase in P-max(B) with rising temperature in assemblages from the shelf COY waters. Similarly, transcription levels of the diatom-specific rbcL gene, which encodes the large subunit of RuBisCO, also increased with rising temperature in the shelf assemblages. In contrast, temperature had little effect on the maximum photochemical quantum efficiency (F-v/F-m) of photosystem II. The results suggested that the transcription activity of the diatom-specific rbcL gene was upregulated by the increase in temperature, and that led to the higher P-max(B) values and the spring diatom bloom in the shelf COY region.
    WorkplaceInstitute of Microbiology
    ContactEliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231
    Year of Publishing2019
Number of the records: 1