Nanoplanktonic diatoms are globally overlooked but play a role in spring blooms and carbon export
|Author(s)||Leblanc Karine1, Queguiner Bernard1, Diaz Frederic1, Cornet Veronique1, Michel-Rodriguez Monica1, de Madron Xavier Durrieu2, Bowler Chris3, Malviya Shruti3, 4, Thyssen Melilotus1, Gregori Gerald1, Rembauville Mathieu5, Grosso Olivier1, Poulain Julie6, de Vargas Colomban7, Pujo-Pay Mireille5, Conan Pascal5|
|Affiliation(s)||1 : Aix Marseille Univ, Univ Toulon, UM110, MIO,IRD,CNRS, F-13288 Marseille, France.
2 : Univ Perpignan, Ctr Etud & Format Environm Mediterraneens, CNRS, UMR 5110, Via Domitia, F-66860 Perpignan, France.
3 : PSL Univ Paris, INSERM, CNRS, Ecole Normale Super,IBENS, F-75005 Paris, France.
4 : Tata Inst Fundamental Res, Natl Ctr Biol Sci, Simons Ctr Study Living Machines, UAS GKVK Campus,Bellary Rd, Bangalore 560065, Karnataka, India.
5 : Univ Paris 06, UPMC, Sorbonne Univ,CNRS,UMR7621, Lab Oceanog Microbienne,Observ Oceanol, F-66650 Banyuls Sur Mer, France.
6 : Genoscope, Inst Biol Francois Jacob, CEA, 2 Rue Gaston Cremieux, F-91057 Evry, France.
7 : CNRS, UMR 7144, Stn Biolog Roscoff, Pl Georges Teissier, F-29680 Roscoff, France.
|Source||Nature Communications (2041-1723) (Nature Publishing Group), 2018-03 , Vol. 9 , N. 1 , P. 953 (12p.)|
|WOS© Times Cited||90|
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.