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No evidence of phago-mixotropy in Micromonas polaris, the dominant picophytoplankton species in the Arctic

Valeria Jimenez, John A. Burns, Florence Le Gall, View ORCID ProfileFabrice Not, View ORCID ProfileDaniel Vaulot
doi: https://doi.org/10.1101/2020.05.26.117895
Valeria Jimenez
1Sorbonne Université, CNRS, UMR7144, Ecology of Marine Plankton team, Station Biologique de Roscoff, 29680 Roscoff, France
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John A. Burns
2Bigelow Laboratory for Ocean Sciences, East Boothbay, ME, USA
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Florence Le Gall
1Sorbonne Université, CNRS, UMR7144, Ecology of Marine Plankton team, Station Biologique de Roscoff, 29680 Roscoff, France
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Fabrice Not
1Sorbonne Université, CNRS, UMR7144, Ecology of Marine Plankton team, Station Biologique de Roscoff, 29680 Roscoff, France
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Daniel Vaulot
1Sorbonne Université, CNRS, UMR7144, Ecology of Marine Plankton team, Station Biologique de Roscoff, 29680 Roscoff, France
3Asian School of the Environment, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
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  • For correspondence: vaulot@gmail.com
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ABSTRACT

In the Arctic Ocean, the small green alga Micromonas polaris dominates pico-phytoplankton during the summer months. It has been previously hypothesized to be phago-mixotrophic (capable of bacteria ingestion) based on laboratory and field experiments. Prey uptake was analysed in several M. polaris strains isolated from different regions and depths of the Arctic Ocean. Using both fluorescent beads and fluorescently labelled bacteria as prey, we found no evidence of phago-mixotrophy in any M. polaris strain by flow cytometric measurement of prey ingestion. In addition, in silico predictions reveal that members of the genus Micromonas lack a genetic signature of phagocytotic capacity.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • https://github.com/burnsajohn/predictTrophicMode

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted May 27, 2020.
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No evidence of phago-mixotropy in Micromonas polaris, the dominant picophytoplankton species in the Arctic
Valeria Jimenez, John A. Burns, Florence Le Gall, Fabrice Not, Daniel Vaulot
bioRxiv 2020.05.26.117895; doi: https://doi.org/10.1101/2020.05.26.117895
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No evidence of phago-mixotropy in Micromonas polaris, the dominant picophytoplankton species in the Arctic
Valeria Jimenez, John A. Burns, Florence Le Gall, Fabrice Not, Daniel Vaulot
bioRxiv 2020.05.26.117895; doi: https://doi.org/10.1101/2020.05.26.117895

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