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Mucospheres produced by a mixotrophic protist impact ocean carbon cycling


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Larsson, ME, Bramucci, AR, Collins, S, Hallegraeff, G ORCID: 0000-0001-8464-7343, Kahlke, T, Raina, J-B, Seymour, JR and Doblin, MA 2022 , 'Mucospheres produced by a mixotrophic protist impact ocean carbon cycling' , Nature Communications, vol. 13 , pp. 1-15 , doi: 10.1038/s41467-022-28867-8.

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Mixotrophic protists (unicellular eukaryotes) that engage in both phototrophy (photosynthesis) and phago-heterotrophy (engulfment of particles)—are predicted to contribute substantially to energy fluxes and marine biogeochemical cycles. However, their impact remains largely unquantified. Here we describe the sophisticated foraging strategy of a widespread mixotrophic dinoflagellate, involving the production of carbon-rich ‘mucospheres’ that attract, capture, and immobilise microbial prey facilitating their consumption. We provide a detailed characterisation of this previously undescribed behaviour and reveal that it represents an overlooked, yet quantitatively significant mechanism for oceanic carbon fluxes. Following feeding, the mucospheres laden with surplus prey are discarded and sink, contributing an estimated 0.17–1.24 mg m−2 d−1 of particulate organic carbon, or 0.02–0.15 Gt to the biological pump annually, which represents 0.1–0.7% of the estimated total export from the euphotic zone. These findings demonstrate how the complex foraging behaviour of a single species of mixotrophic protist can disproportionally contribute to the vertical flux of carbon in the ocean.

Item Type: Article
Authors/Creators:Larsson, ME and Bramucci, AR and Collins, S and Hallegraeff, G and Kahlke, T and Raina, J-B and Seymour, JR and Doblin, MA
Keywords: mixotrophy, ocean carbon cycling, mucospheres, protist
Journal or Publication Title: Nature Communications
Publisher: Nature Publishing Group
ISSN: 2041-1723
DOI / ID Number: 10.1038/s41467-022-28867-8
Copyright Information:

Copyright 2022 The Author(s)Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

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