期刊
ISME JOURNAL
卷 15, 期 9, 页码 2509-2522出版社
SPRINGERNATURE
DOI: 10.1038/s41396-021-00915-z
关键词
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资金
- French oceanographic fleet (Flotte oceanographique francaise)
- French ANR (Agence Nationale de la Recherche) [ANR-17-CE01-0013]
- French Research program of INSU-CNRS LEFE/CYBER (Les enveloppes fluides et l'environnement-Cycles biogeochimiques, environnement et ressources)
- French Ministry of Higher Education
- Region des Hauts de France
- French Research program of INSU-CNRS LEFE/CYBER
- Agence Nationale de la Recherche (ANR) [ANR-17-CE01-0013] Funding Source: Agence Nationale de la Recherche (ANR)
This study measured the CO2-fixation of different groups of phytoplankton in the Southern Ocean and found that small phytoplankton play a significant role in carbon fixation and export, especially after intense diatom blooms. The results highlight the importance of further exploring the role of small cells in CO2-fixation and export in the Southern Ocean.
Phytoplankton is composed of a broad-sized spectrum of phylogenetically diverse microorganisms. Assessing CO2-fixation intra- and inter-group variability is crucial in understanding how the carbon pump functions, as each group of phytoplankton may be characterized by diverse efficiencies in carbon fixation and export to the deep ocean. We measured the CO2-fixation of different groups of phytoplankton at the single-cell level around the naturally iron-fertilized Kerguelen plateau (Southern Ocean), known for intense diatoms blooms suspected to enhance CO2 sequestration. After the bloom, small cells (<20 mu m) composed of phylogenetically distant taxa (prymnesiophytes, prasinophytes, and small diatoms) were growing faster (0.37 +/- 0.13 and 0.22 +/- 0.09 division d(-1) on- and off-plateau, respectively) than larger diatoms (0.11 +/- 0.14 and 0.09 +/- 0.11 division d(-1) on- and off-plateau, respectively), which showed heterogeneous growth and a large proportion of inactive cells (19 +/- 13%). As a result, small phytoplankton contributed to a large proportion of the CO2 fixation (41-70%). The analysis of pigment vertical distribution indicated that grazing may be an important pathway of small phytoplankton export. Overall, this study highlights the need to further explore the role of small cells in CO2-fixation and export in the Southern Ocean.
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