Deuterium in Marine Organic Biomarkers: Toward a new tool for quantifying aquatic mixotrophy

Type Article
Date 2022-05
Language English
Author(s) Cormier Marc‐andréORCID1, Berard Jean-BaptisteORCID2, Bougaran GaelORCID2, Trueman Clive N.3, Mayor Daniel J.4, Lampitt Richard S.4, Kruger Nicholas J.ORCID5, Flynn Kevin J.6, Rickaby Rosalind E. M.1
Affiliation(s) 1 : Deuterium in Marine Organic Biomarkers: Toward a new tool for quantifying aquatic mixotrophyUniversity of Oxford Department of Earth Sciences South Parks Road Oxford OX1 3AN ,UK
2 : IFREMER, Physiology and Biotechnology of Algae (PBA) Laboratory rue de l'Ile d'Yeu, BP 21105 44311 Nantes cedex 3 ,France
3 : Ocean and Earth Science University of Southampton Southampton SO14 3ZH, UK
4 : Ocean Biogeosciences National Oceanography Centre Southampton SO14 3ZH, UK
5 : University of Oxford Department of Plant Sciences South Parks Road Oxford OX1 3RB, UK
6 : Plymouth Marine Laboratory Plymouth Prospect Place PL1 3DH, UK
Source New Phytologist (0028-646X) (Wiley), 2022-05 , Vol. 234 , N. 3 , P. 776-782
DOI 10.1111/nph.18023
WOS© Times Cited 3
Keyword(s) biomarker, carbon cycle, hydrogen, isotope, mixoplankton, mixotrophy, protist

The traditional separation between primary producers (autotrophs) and consumers (heterotrophs) at the base of the marine food web is being increasingly replaced by the paradigm that mixoplankton, planktonic protists with the nutritional ability to use both phago(hetero)trophy and photo(auto)trophy to access energy, are widespread globally. Thus many "phytoplankton" eat, while 50% of "protozooplankton" also perform photosynthesis. Mixotrophy may enhance primary production, biomass transfer to higher trophic levels, and the efficiency of the biological pump to sequester atmospheric CO2 into the deep ocean. Although this view is gaining traction, science lacks a tool to quantify the relative contributions of autotrophy and heterotrophy in planktonic protists. This hinders our understanding of their impacts on carbon cycling within marine pelagic ecosystems. It has been shown that the hydrogen (H) isotopic signature of lipids is uniquely sensitive to heterotrophy relative to autotrophy in plants and bacteria. Here we explored whether it is also sensitive to the trophic status in protists. The new understanding of H isotope signature of lipid biomarkers suggests it offers great potential as a novel tool for quantifying the prevalence of mixotrophy in diverse marine microorganisms and thus to investigate the implications of the “mixoplankton” paradigm.

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Cormier Marc‐andré, Berard Jean-Baptiste, Bougaran Gael, Trueman Clive N., Mayor Daniel J., Lampitt Richard S., Kruger Nicholas J., Flynn Kevin J., Rickaby Rosalind E. M. (2022). Deuterium in Marine Organic Biomarkers: Toward a new tool for quantifying aquatic mixotrophy. New Phytologist, 234(3), 776-782. Publisher's official version : , Open Access version :