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Significant CO2 fixation by small prymnesiophytes in the subtropical and tropical northeast Atlantic Ocean

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Jardillier, Ludwig, Zubkov, Mikhail V. , Pearman, John K. and Scanlan, David J. (2010) Significant CO2 fixation by small prymnesiophytes in the subtropical and tropical northeast Atlantic Ocean. ISME Journal, Vol.4 (No.9). pp. 1180-1192. doi:10.1038/ismej.2010.36

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Official URL: http://dx.doi.org/10.1038/ismej.2010.36

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Abstract

Global estimates indicate the oceans are responsible for approximately half of the carbon dioxide fixed on Earth. Organisms <= 5 mu m in size dominate open ocean phytoplankton communities in terms of abundance and CO(2) fixation, with the cyanobacterial genera Prochlorococcus and Synechococcus numerically the most abundant and more extensively studied compared with small eukaryotes. However, the contribution of specific taxonomic groups to marine CO(2) fixation is still poorly known. In this study, we show that among the phytoplankton, small eukaryotes contribute significantly to CO(2) fixation (44%) because of their larger cell volume and thereby higher cell-specific CO(2) fixation rates. Within the eukaryotes, two groups, herein called Euk-A and Euk-B, were distinguished based on their flow cytometric signature. Euk-A, the most abundant group, contained cells 1.8 +/- 0.1 mu m in size while Euk-B was the least abundant but cells were larger (2.8 +/- 0.2 mu m). The Euk-B group comprising prymnesiophytes (73 +/- 13%) belonging largely to lineages with no close cultured counterparts accounted for up to 38% of the total primary production in the subtropical and tropical northeast Atlantic Ocean, suggesting a key role of this group in oceanic CO(2) fixation. The ISME Journal (2010) 4, 1180-1192; doi: 10.1038/ismej.2010.36; published online 15 April 2010

Item Type: Journal Article
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010)
Journal or Publication Title: ISME Journal
Publisher: Nature Publishing Group
ISSN: 1751-7362
Official Date: September 2010
Dates:
DateEvent
September 2010Published
Volume: Vol.4
Number: No.9
Page Range: pp. 1180-1192
DOI: 10.1038/ismej.2010.36
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Natural Environment Research Council (NERC)
Grant number: NE/C003160/1 (NERC)

Data sourced from Thomson Reuters' Web of Knowledge

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