Nanoplanktonic diatoms are globally overlooked but play a role in spring blooms and carbon export

Karine Leblanc; Bernard Queguiner; Frederic Diaz; Veronique Cornet; Mónica Michel-Rodriguez; Xavier Durrieu de Madron; Chris Bowler; Shruti Malviya; Melilotus Thyssen; Gérald Grégori; Mathieu Rembauville; Olivier Grosso; Julie Poulain; Colomban de Vargas; Mireille Pujo-Pay; Pascal Conan

doi:10.1038/s41467-018-03376-9

Nanoplanktonic diatoms are globally overlooked but play a role in spring blooms and carbon export

Karine Leblanc ¹ Bernard Queguiner ² Frederic Diaz ¹ Veronique Cornet ¹ Mónica Michel-Rodriguez ¹ Xavier Durrieu de Madron ³ Chris Bowler ⁴ Shruti Malviya ⁴ Melilotus Thyssen ⁵ Gérald Grégori ¹ Mathieu Rembauville ⁶ Olivier Grosso ¹ Julie Poulain ⁷ Colomban de Vargas ⁸ Mireille Pujo-Pay ⁹ Pascal Conan ¹⁰

1 MIO - Institut méditerranéen d'océanologie

2 LOB - Laboratoire d'océanographie et de biogéochimie

3 CEFREM - Centre de Formation et de Recherche sur les Environnements Méditérranéens

4 IBENS - Institut de biologie de l'ENS Paris (UMR 8197/1024)

5 LOG - Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187

6 LOMIC - Laboratoire d'Océanographie Microbienne

7 IG - Institut de Génomique d'Evry

8 EPEP - Evolution des Protistes et Ecosystèmes Pélagiques

ADMM - Adaptation et diversité en milieu marin

9 LOBB - Laboratoire d'océanographie biologique de Banyuls

10 LOMIC - Laboratoire d'Océanographie Microbienne

Abstract : Diatoms are one of the major primary producers in the ocean, responsible annually for ~20% of photosynthetically fixed CO2 on Earth. In oceanic models, they are typically represented as large (>20 µm) microphytoplankton. However, many diatoms belong to the nanophytoplankton (2-20 µm) and a few species even overlap with the picoplanktonic size-class (<2 µm). Due to their minute size and difficulty of detection they are poorly characterized. Here we describe a massive spring bloom of the smallest known diatom (Minidiscus) in the northwestern Mediterranean Sea. Analysis of Tara Oceans data, together with literature review, reveal a general oversight of the significance of these small diatoms at the global scale. We further evidence that they can reach the seafloor at high sinking rates, implying the need to revise our classical binary vision of pico- and nanoplanktonic cells fueling the microbial loop, while only microphytoplankton sustain secondary trophic levels and carbon export.

Document type :

Journal articles

Domain :

Life Sciences [q-bio]

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