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

SYSNO ASEP	0498680
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Community 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 Title	Estuarine Coastal and Shelf Science. - : Elsevier - ISSN 0272-7714 Roč. 212, NOV15 (2018), s. 80-94
Number of pages	15 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	Coastal Oyashio ; Spring diatom bloom ; P-E curve
Subject RIV	EE - Microbiology, Virology
OECD category	Microbiology
R&D Projects	ED2.1.00/03.0110 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
	LO1416 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
Institutional support	MBU-M - RVO:61388971
UT WOS	000446286100009
EID SCOPUS	85049484915
DOI	10.1016/j.ecss.2018.06.018
Annotation	Globally, 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.
Workplace	Institute of Microbiology
Contact	Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231
Year of Publishing	2019

Number of the records: 1