N2-fixation
Deep Into Oceanic N2 Fixation
... budget ( Codispoti et al., 2001; Codispoti, 2007; Eugster and Gruber, 2012 ). Since the early 1970s, diazotrophic activity has been attributed to autotrophic cyanobacteria constrained to the sunlit and oligotrophic layer ...
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Phosphorus requirement for symbiotic N2 fixation: a major challenge for sustainable agro-ecosystems
... Jean-Jacques Drevon, Josiane Abadie, Laurie Amenc, Adnane Bargaz, Odile Domergue, et al... Phos- phorus requirement for symbiotic N2 fixation: a major challenge for sustainable agro-ecos[r] ...
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Importance of N2-Fixation on the Productivity at the North-Western Azores Current/Front System, and the Abundance of Diazotrophic Unicellular Cyanobacteria.
... (30%). N2- fixation rates sustained on average 45-64% of this production south of the AzF and up to 85% at the northernmost station (using the average ...
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Carbon transfer from the host diatom enables fast growth and high rate of N2 fixation by symbiotic heterocystous cyanobacteria
... for N2 fixation (Figure 3 ...for N2 fixation is relatively small due to the overwhelming cost for managing O2 diffused from the environment [ 37 ...for N2 fixation (energy and ...
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Assessment of the impact of climate change in temperate zone on grain legume yield and N2 fixation
... Assessment of the impact of climate change in temperate zone on grain legume yield and N2 fixation?. Gatien Falconnier, Anthony Vermue, Etienne-Pascal Journet, Laurent Bedoussac, Eric Ju[r] ...
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Phosphorus use efficiency in symbiotic N2 fixation for coupling bio-geochemical cycles in agrosystems with legumes
... Phosphorus use efficiency in symbiotic N2 fixation for coupling bio-geochemical cycles in agrosystems with legumes J.J. Drevon 1* , L. Amenc 1 , A. Bargaz 2 , T Becquer 1 , D Blavet 1 , F. Gérard 1 , O. ...
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Aphotic N2 Fixation in the Eastern Tropical South Pacific Ocean
... primary production [3], aphotic N 2 fixation may sustain organic matter remineralization. These new sources of N could potentially compensate for as much as 78% of the estimated N loss processes in ETSP, ...
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Mesopelagic N2 Fixation Related to Organic Matter Composition in the Solomon and Bismarck Seas (Southwest Pacific)
... 2 fixation was previously primarily attributed to the filamentous cyanobacterium Trichodesmium ...2 fixation in several oceanic basins [ 12 ...2 fixation potential and ecol- ogy are largely unknown [ ...
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Evidence of high N2 fixation rates in the temperate northeast Atlantic
... These statements are further supported by the outcome of a multivariate statistical analysis, providing a comprehensive view of the environmental features influencing N 2 fixation. A principal component analysis ...
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Aphotic N2 fixation along an oligotrophic to ultraoligotrophic transect in the western tropical South Pacific Ocean
... correlated with DOM compounds. The analysis of nifH gene amplicons revealed a wide diversity of non-cyanobacterial diazotrophs, mostly matching clusters 1 and 3. Interestingly, a distinct phylotype from the major nifH ...
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Importance of N2-Fixation on the Productivity at the North-Western Azores Current/Front System, and the Abundance of Diazotrophic Unicellular Cyanobacteria
... sured. These values are in the range of rates and cellular abundances measured in past studies in summer 2008 in the Western Mediterranean basin, where N 2 -fixation was estimated to con- tribute significantly to ...
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Dynamics of N2 fixation and fate of diazotroph-derived nitrogen in a low-nutrient, low-chlorophyll ecosystem: results from the VAHINE mesocosm experiment (New Caledonia)
... Frank, I., Bode, A., Bonnet, S., Boström, K. H., Böttjer, D., Capone, D. G., Carpenter, E. J., Chen, Y. L., Church, M. J., Dore, J. E., Falcón, L. I., Fernández, A., Foster, R. A., Furuya, K., Gómez, F., Gundersen, K., ...
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Revisiting the distribution of oceanic N2 fixation and estimating diazotrophic contribution to marine production
... analyses, the volumetric N 2 fixation rates at different depths and at surface are significantly larger in coastal regions than in the open ocean (p < 0.01), while depth-integrated N 2 [r] ...
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Basin-wide N2 fixation in the deep waters of the Mediterranean Sea
... by N2 fixation inputs [Deutsch et ...ficant N2 fixation rates reported from these areas [Fernández et ...ficant N2 fixation rates have also been reported from fully oxygenated mesopelagic waters ( >200 ...
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Nitrate isotope anomalies as indicator of N2 fixation in the Azores Front region (subtropical N-E Atlantic)
... environnement est très pertinent pour l'étude des processus impliquant l'azote, qui jouent un rôle primordial dans la séquestration du co 2 atmosphérique dans les régions de ba[r] ...
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Dissolved Organic Matter Influences N2 Fixation in the New Caledonian Lagoon (Western Tropical South Pacific)
... Grokopf, T., Mohr, W., Baustian, T., Schunck, H., Gill, D., Kuypers, M. M. M., et al. (2012). Doubling of marine dinitrogen-fixation rates based on direct measurements. Nature 488, 361–364. doi: ...
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Variability of N2 fixation in cowpea under phosphorus deficiency is related to phosphorus use efficiency
... nitrogen fixation (SNF), five genotypes, Adrar, El Kala, Djenet, Tizi Ouzou and Bejaia, were grown in semi- hydroponic culture with sufficient versus deficient P ...
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La fixation d'azote dans l'ouest de l'océan Arctique
... Cyanobacteria represented a minor constituent of the Arctic diazotrophic community. The low representation of cyanobacteria agrees with previous studies that suggested their near absence from polar seas (Gradinger and ...
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Probabilité de fixation dans des modèles génétiques de populations à plusieurs allèles
... Pour tous les calculs, nous utiliserons un même argument : sous neutralité, sachant qu'un échantillon de b gènes choisis au hasard à la génération t ont a ancêtres[r] ...
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Sélection d'espèces ligneuses adaptées à la fixation biologique de dunes au Niger
... Dans une moindre mesure que les Acacia raddiana et senegal, l'A. nilotica présente une limitation appréciable de la perte d'eau des tissus en conditions de stress hydrique. Cette espèce présente un meilleur taux de ...
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