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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F18%3A00498680" target="_blank" >RIV/61388971:_____/18:00498680 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.ecss.2018.06.018" target="_blank" >http://dx.doi.org/10.1016/j.ecss.2018.06.018</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ecss.2018.06.018" target="_blank" >10.1016/j.ecss.2018.06.018</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10606 - Microbiology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Estuarine Coastal and Shelf Science

ISSN

0272-7714

e-ISSN

—

Volume of the periodical

212

Issue of the periodical within the volume

NOV15

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

80-94

UT code for WoS article

000446286100009

EID of the result in the Scopus database

2-s2.0-85049484915