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Phytoplankton blooms at increasing levels of atmospheric carbon dioxide: experimental evidence for negative effects on prymnesiophytes and positive on small picoeukaryotes

Citation

Schulz, KG and Bach, LT and Bellerby, RGJ and Bermudez, R and Budenbender, J and Boxhammer, T and Czerny, J and Engel, A and Ludwig, A and Meyerhofer, M and Larsen, A and Paul, AJ and Sswat, M and Riebesell, U, Phytoplankton blooms at increasing levels of atmospheric carbon dioxide: experimental evidence for negative effects on prymnesiophytes and positive on small picoeukaryotes, Frontiers in Marine Science, 4 Article 64. ISSN 2296-7745 (2017) [Refereed Article]


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Copyright Statement

Copyright 2017 Schulz, Bach, Bellerby, Bermudez, Budenbender, Boxhammer, Czerny, Engel, Ludwig, Meyerhofer, Larsen, Paul Sswat and Riebesell. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3389/fmars.2017.00064

Abstract

Anthropogenic emissions of carbon dioxide (CO2) and the ongoing accumulation in the surface ocean together with concomitantly decreasing pH and calcium carbonate saturation states have the potential to impact phytoplankton community composition and therefore biogeochemical element cycling on a global scale. Here we report on a recent mesocosm CO2 perturbation study (Raunefjorden, Norway), with a focus on organic matter and phytoplankton dynamics. Cell numbers of three phytoplankton groups were particularly affected by increasing levels of seawater CO2 throughout the entire experiment, with the cyanobacterium Synechococcus and picoeukaryotes (prasinophytes) profiting, and the coccolithophore Emiliania huxleyi (prymnesiophyte) being negatively impacted. Combining these results with other phytoplankton community CO2 experiments into a data-set of global coverage suggests that, whenever CO2 effects are found, prymnesiophyte (especially coccolithophore) abundances are negatively affected, while the opposite holds true for small picoeukaryotes belonging to the class of prasinophytes, or the division of chlorophytes in general. Future reductions in calcium carbonate-producing coccolithophores, providing ballast which accelerates the sinking of particulate organic matter, together with increases in picoeukaryotes, an important component of the microbial loop in the euphotic zone, have the potential to impact marine export production, with feedbacks to Earth's climate system.

Item Details

Item Type:Refereed Article
Keywords:phytoplankton, ocean acidification
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological Oceanography
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
UTAS Author:Bach, LT (Dr Lennart Bach)
ID Code:133662
Year Published:2017
Web of Science® Times Cited:26
Deposited By:Ecology and Biodiversity
Deposited On:2019-07-05
Last Modified:2019-08-05
Downloads:3 View Download Statistics

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