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Introduction to the project VAHINE: VAriability of vertical and tropHlc transfer of diazotroph derived N in the south wEst Pacific

Authors :
Bertrand Bourgeois
Eric Folcher
Jean-Michel Grisoni
Armelle Renaud
Sophie Bonnet
Francis Louis
Martine Rodier
Jean-Michel Boré
Thierry Moutin
Institut méditerranéen d'océanologie ( MIO )
Centre National de la Recherche Scientifique ( CNRS ) -Université de Toulon ( UTLN ) -Aix Marseille Université ( AMU ) -Institut de Recherche pour le Développement ( IRD )
Institut méditerranéen d'océanologie (MIO)
Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)
Observatoire océanologique de Villefranche-sur-mer (OOVM)
Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Laboratoire d'océanographie de Villefranche (LOV)
Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV)
Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)
Source :
Biogeosciences, Biogeosciences, European Geosciences Union, 2016, 13 (9), pp.2803-2814. 〈10.5194/bg-13-2803-2016〉, Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2016, Vol. 13, N. 9, P. 2803-2814, Biogeosciences, European Geosciences Union, 2016, 13 (9), pp.2803-2814. ⟨10.5194/bg-13-2803-2016⟩, Biogeosciences, 2016, 13 (9), pp.2803-2814. ⟨10.5194/bg-13-2803-2016⟩, Biogeosciences, Vol 13, Iss 9, Pp 2803-2814 (2016)
Publication Year :
2016
Publisher :
HAL CCSD, 2016.

Abstract

On the global scale, N2 fixation provides the major external source of reactive nitrogen to the surface ocean, surpassing atmospheric and riverine inputs, and sustains ∼ 50 % of new primary production in oligotrophic environments. The main goal of the VAriability of vertical and tropHIc transfer of diazotroph derived N in the south wEst Pacific (VAHINE) project was to study the fate of nitrogen newly fixed by diazotrophs (or diazotroph-derived nitrogen) in oceanic food webs, and how it impacts heterotrophic bacteria, phytoplankton and zooplankton dynamics, stocks and fluxes of biogenic elements and particle export. Three large-volume ( ∼ 50 m3) mesocosms were deployed in a tropical oligotrophic ecosystem (the New Caledonia lagoon, south-eastern Pacific) and intentionally fertilized with ∼ 0.8 µM of dissolved inorganic phosphorus (DIP) to stimulate diazotrophy and follow subsequent ecosystem changes. VAHINE was a multidisciplinary project involving close collaborations between biogeochemists, molecular ecologist, chemists, marine opticians and modellers. This introductory paper describes in detail the scientific objectives of the project as well as the implementation plan: the mesocosm description and deployment, the selection of the study site (New Caledonian lagoon), and the logistical and sampling strategy. The main hydrological and biogeochemical conditions of the study site before the mesocosm deployment and during the experiment itself are described, and a general overview of the papers published in this special issue is presented.

Details

Language :
English
ISSN :
17264170 and 17264189
Database :
OpenAIRE
Journal :
Biogeosciences, Biogeosciences, European Geosciences Union, 2016, 13 (9), pp.2803-2814. 〈10.5194/bg-13-2803-2016〉, Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2016, Vol. 13, N. 9, P. 2803-2814, Biogeosciences, European Geosciences Union, 2016, 13 (9), pp.2803-2814. ⟨10.5194/bg-13-2803-2016⟩, Biogeosciences, 2016, 13 (9), pp.2803-2814. ⟨10.5194/bg-13-2803-2016⟩, Biogeosciences, Vol 13, Iss 9, Pp 2803-2814 (2016)
Accession number :
edsair.doi.dedup.....ae82312d6cfa8e9bdabf14b828ac3642
Full Text :
https://doi.org/10.5194/bg-13-2803-2016〉