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Combined effects of CO2 and temperature on carbon uptake and partitioning by the marine diatoms Thalassiosira weissflogii and Dactyliosolen fragilissimus

Carbon uptake and partitioning of two globally abundant diatom species, Thalassiosira weissflogii and Dactyliosolen fragilissimus, was investigated in batch culture experiments under four conditions: ambient (15°C, 400 µatm), high CO2 (15°C, 1000 µatm), high temperature (20°C, 400 µatm), and combined (20°C, 1000 µatm). The experiments were run from exponential growth into the stationary phase (six days after nitrogen depletion), allowing us to track biogeochemical dynamics analogous to bloom situations in the ocean. Elevated CO2 had a fertilizing effect and enhanced uptake of dissolved inorganic carbon (DIC) by about 8% for T. weissflogii and by up to 39% for D. fragilissimus. This was also reflected in higher cell numbers, build-up of particulate and dissolved organic matter, and transparent exopolymer particles. The CO2 effects were most prominent in the stationary phase when nitrogen was depleted and CO2(aq) concentrations were low. This indicates that diatoms in the high CO2 treatments could take up more DIC until CO2 concentrations in seawater became so low that carbon limitation occurs. These results suggest that, contrary to common assumptions, diatoms could be highly sensitive to ongoing changes in oceanic carbonate chemistry, particularly under nutrient limitation. Warming from 15 to 20 °C had a stimulating effect on one species but acted as a stressor on the other species, highlighting the importance of species-specific physiological optima and temperature ranges in the response to ocean warming. Overall, these sensitivities to CO2 and temperature could have profound impacts on diatoms blooms and the biological pump.

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Taucher, Jan, Jones, Jacob, James, A, Brzezinski, Mark A, Carlson, C A, Riebesell, Ulf, Passow, Uta (2015). Dataset: Combined effects of CO2 and temperature on carbon uptake and partitioning by the marine diatoms Thalassiosira weissflogii and Dactyliosolen fragilissimus. https://doi.org/10.1594/PANGAEA.849402

DOI retrieved: 2015

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.849402
Author Taucher, Jan
Given Name Jan
Family Name Taucher
More Authors
Jones, Jacob
James, A
Brzezinski, Mark A
Carlson, C A
Riebesell, Ulf
Passow, Uta
Source Creation 2015
Publication Year 2015
Resource Type text/tab-separated-values - filename: Taucher_2015
Subject Areas
Name: BiologicalClassification

Name: Chemistry

Name: Oceans

Related Identifiers
Title: Combined effects of CO2 and temperature on carbon uptake and partitioning by the marine diatoms Thalassiosira weissflogii and Dactyliosolen fragilissimus
Identifier: https://doi.org/10.1002/lno.10063
Type: DOI
Relation: IsSupplementTo
Year: 2015
Source: Limnology and Oceanography
Authors: Taucher Jan , Jones Jacob , James A , Brzezinski Mark A , Carlson C A , Riebesell Ulf , Passow Uta .

Title: Dataset: Data Set 1A: Partitioning of carbon as a function of pCO2 and temperature during growth of Thalassiosira weissflogii
Identifier: https://www.bco-dmo.org/dataset/4046
Type: DOI
Relation: References
Year: 2013
Source: Biological and Chemical Oceanography Data Management Office
Authors: Passow Uta , Passow Uta , Gattuso Jean-Pierre , Epitalon Jean-Marie , Lavigne Héloïse .

Title: Dataset: Data Set 2A: Partitioning of carbon as a function of pCO2 and temperature during growth of Dactyliosolen fragilissimus
Identifier: https://www.bco-dmo.org/dataset/4047
Type: DOI
Relation: References
Year: 2013
Source: Biological and Chemical Oceanography Data Management Office
Authors: Passow Uta , Passow Uta , Gattuso Jean-Pierre , Epitalon Jean-Marie , Lavigne Héloïse .

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: Passow Uta , Passow Uta , Gattuso Jean-Pierre , Epitalon Jean-Marie , Lavigne Héloïse .