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Seawater carbonate chemistry and growth and particulate organic nitrogen production of diatom Thalassiosira pseudonana

Phytoplankton in the upper oceans are exposed to changing light levels due to mixing, diurnal solar cycles and weather conditions. Consequently, effects of ocean acidification are superimposed upon responses to variable light levels. We therefore grew a model diatom Thalassiosira pseudonana under either constant or variable light but at the same daily photon dose, with current low (400 μatm, LC) and future high CO2 (1000 μatm, HC) treatments. Variable light, compared with the constant light regime, decreased the growth rate, Chl a, Chl c, and carotenoid contents under both LC and HC conditions. Cells grown under variable light appeared more tolerant of high light as indicated by higher maximum relative electron transport rate and saturation light. Light variation interacted with high CO2/lowered pH to decrease the carbon fixation rate, but increased particulate organic carbon (POC) and particularly nitrogen (PON) per cell, which drove a decrease in C/N ratio, reflecting changes in the efficiency of energy transfer from photo-chemistry to net biomass production. Our results imply that elevated pCO2 under varying light conditions can lead to less primary productivity but more PON per biomass of the diatom, which might improve the food quality of diatoms and thereby influence biogeochemical nitrogen cycles.

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Li, Wei, Wang, Tifeng, Campbell, Douglas A, Gao, Kunshan (2020). Dataset: Seawater carbonate chemistry and growth and particulate organic nitrogen production of diatom Thalassiosira pseudonana. https://doi.org/10.1594/PANGAEA.922459

DOI retrieved: 2020

Additional Info

Field Value
Imported on November 29, 2024
Last update November 30, 2024
License CC-BY-4.0
Source https://doi.org/10.1594/PANGAEA.922459
Author Li, Wei
Given Name Wei
Family Name Li
More Authors
Wang, Tifeng
Campbell, Douglas A
Gao, Kunshan
Source Creation 2020
Publication Year 2020
Resource Type text/tab-separated-values - filename: Li-etal_2020_MER
Subject Areas
Name: BiologicalClassification

Name: Biosphere

Name: Chemistry

Name: Ecology

Name: Oceans

Related Identifiers
Title: Ocean acidification interacts with variable light to decrease growth but increase particulate organic nitrogen production in a diatom
Identifier: https://doi.org/10.1016/j.marenvres.2020.104965
Type: DOI
Relation: References
Year: 2020
Source: Marine Environmental Research
Authors: Li Wei , Wang Tifeng , Campbell Douglas A , Gao Kunshan , Gattuso Jean-Pierre , Epitalon Jean-Marie , Lavigne Héloïse , Orr James C , Gentili Bernard , Hagens Mathilde , Hofmann Andreas , Mueller Jens-Daniel , Proye Aurélien , Rae James , Soetaert Karline .

Title: seacarb: seawater carbonate chemistry with R. R package version 3.2.12
Identifier: https://CRAN.R-project.org/package=seacarb
Type: DOI
Relation: References
Year: 2019
Authors: Li Wei , Wang Tifeng , Campbell Douglas A , Gao Kunshan , Gattuso Jean-Pierre , Epitalon Jean-Marie , Lavigne Héloïse , Orr James C , Gentili Bernard , Hagens Mathilde , Hofmann Andreas , Mueller Jens-Daniel , Proye Aurélien , Rae James , Soetaert Karline .