Riverine Particulate Matter Enhances the Growth and Viability of the Marine Diatom Thalassiosira weissflogii

Author:

Grimm Christian1,Feurtet-Mazel Agnès2,Pokrovsky Oleg S.134ORCID,Oelkers Eric H.15

Affiliation:

1. Geoscience Environment Toulouse, UMR 5563 CNRS, Université Paul-Sabatier, 14 Avenue Edouard-Belin, 31400 Toulouse, France

2. UMR CNRS 5805 EPOC Environnements et Paléoenvironnements Océaniques et Continentaux, Aquatic Ecotoxicology, University of Bordeaux, 33120 Arcachon, France

3. BIO-GEO-CLIM Laboratory, Tomsk State University, 36 Lenin Avenue, 634050 Tomsk, Russia

4. N. Laverov Federal Center of Integrated Arctic Research, Russian Academy of Science, 163000 Arkhangelsk, Russia

5. Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK

Abstract

Riverine particulates dominate the transport of vital nutrients such as Si, Fe or P to the ocean margins, where they may increase primary production by acting as slow-release fertilizer. Furthermore, the supply of particulate surface area to the ocean is considered to be a major control of organic carbon burial. Taken together, these observations suggest a close link between the supply of riverine particulate material and the organic carbon cycle. To explore this link, we conducted microcosm experiments to measure the growth of the marine diatom Thalassiosira weissflogii in the presence and absence of different types and concentrations of riverine particulate material. Results demonstrate a strong positive effect of riverine particulate material on diatom growth with increased total diatom concentrations and slowed post-exponential death rates with increasing particulate concentration. Moreover, SEM and optical microscope investigations confirm that riverine particulates facilitate organic carbon burial through their role in the aggregation and sedimentation of phytoplankton. The supply of riverine particulate material has been shown to be markedly climate sensitive with their fluxes increasing dramatically with increasing global temperature and runoff. This pronounced climate sensitivity implies that riverine particulates contribute substantially in regulating atmospheric CO2 concentrations through their role in the organic carbon cycle.

Funder

Marie Curie EU-FP7 CO2-REACT Research and Training Network

Publisher

MDPI AG

Subject

Geology,Geotechnical Engineering and Engineering Geology

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