The impact of fluctuating light on the dinoflagellate Prorocentrum micans depends on NO3- and CO2 availability

Increasing atmospheric pCO2 and its dissolution into oceans leads to ocean acidification and warming, which reduces the thickness of upper mixing layer (UML) and upward nutrient supply from deeper layers. These events may alter the nutritional conditions and the light regime to which primary producers are exposed in the UML. In order to better understand the physiology behind the responses to the concomitant climate changes factors, we examined the impact of light fluctuation on the dinoflagellate Prorocentrum micans grown at low (1 µmol/L) or high (800 µmol/L) [NO3(-)] and at high (1000 µatm) or low (390 µatm, ambient) pCO2. The light regimes to which the algal cells were subjected were (1) constant light at a photon flux density (PFD) of either 100 (C100) or 500 (C500) µmol/m2/s or (2) fluctuating light between 100 or 500 µmol photons/m2/s with a frequency of either 15 (F15) or 60 (F60) min. Under continuous light, the initial portion of the light phase required the concomitant presence of high CO2 and NO3(-) concentrations for maximum growth. After exposure to light for 3h, high CO2 exerted a negative effect on growth and effective quantum yield of photosystem II (F'(v)/F'(m)). Fluctuating light ameliorated growth in the first period of illumination. In the second 3h of treatment, higher frequency (F15) of fluctuations afforded high growth rates, whereas the F60 treatment had detrimental consequences, especially when NO3(-) concentration was lower. F'(v)/F'(m) respondent differently from growth to fluctuating light: the fluorescence yield was always lower than at continuous light at 100 µmol/m2/s, and always higher at 500 µmol/m2/s. Our data show that the impact of atmospheric pCO2 increase on primary production of dinoflagellate depends on the availability of nitrate and the irradiance (intensity and the frequency of irradiance fluctuations) to which the cells are exposed. The impact of global change on oceanic primary producers would therefore be different in waters with different chemical and physical (mixing) properties.

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Zheng, Ying, Giordano, Mario, Gao, Kunshan (2015). Dataset: The impact of fluctuating light on the dinoflagellate Prorocentrum micans depends on NO3- and CO2 availability. https://doi.org/10.1594/PANGAEA.851340

DOI retrieved: 2015

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Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.851340
Author Zheng, Ying
Given Name Ying
Family Name Zheng
More Authors
Giordano, Mario
Gao, Kunshan
Source Creation 2015
Publication Year 2015
Resource Type text/tab-separated-values - filename: Zheng_2015
Subject Areas
Name: BiologicalClassification

Name: Chemistry

Related Identifiers
Title: The impact of fluctuating light on the dinoflagellate Prorocentrum micans depends on NO3- and CO2 availability
Identifier: https://doi.org/10.1016/j.jplph.2015.01.020
Type: DOI
Relation: IsSupplementTo
Year: 2015
Source: Journal of Plant Physiology
Authors: Zheng Ying , Giordano Mario , Gao Kunshan .

Title: seacarb: seawater carbonate chemistry with R. R package version 3.0.8
Identifier: https://cran.r-project.org/package=seacarb
Type: DOI
Relation: References
Year: 2015
Authors: Gattuso Jean-Pierre , Epitalon Jean-Marie , Lavigne Héloïse .