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Introduction to the project VAHINE: VAriability of vertical and tropHlc transfer of diazotroph derived N in the south wEst Pacific
- 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.
- Subjects :
- 0106 biological sciences
[ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean, Atmosphere
Biogeochemical cycle
010504 meteorology & atmospheric sciences
Reactive nitrogen
lcsh:Life
01 natural sciences
Zooplankton
Mesocosm
lcsh:QH540-549.5
Phytoplankton
Ecosystem
14. Life underwater
Ecology, Evolution, Behavior and Systematics
0105 earth and related environmental sciences
Earth-Surface Processes
Trophic level
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
Ecology
010604 marine biology & hydrobiology
lcsh:QE1-996.5
lcsh:Geology
lcsh:QH501-531
Oceanography
13. Climate action
Environmental science
lcsh:Ecology
Diazotroph
Subjects
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〉