Relevant bibliographies by topics / Planktonic diazotrophs

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Academic literature on the topic 'Planktonic diazotrophs'

Author: Grafiati
Published: 25 May 2024
Last updated: 31 July 2025

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Journal articles on the topic "Planktonic diazotrophs"

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Berthelot, Hugo, Sophie Bonnet, Olivier Grosso, Véronique Cornet, and Aude Barani. "Transfer of diazotroph-derived nitrogen towards non-diazotrophic planktonic communities: a comparative study between <i>Trichodesmium</i> <i>erythraeum</i>, <i>Crocosphaera watsonii</i> and <i>Cyanothece</i> sp." Biogeosciences 13, no. 13 (2016): 4005–21. http://dx.doi.org/10.5194/bg-13-4005-2016.

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Abstract. Biological dinitrogen (N2) fixation is the major source of new nitrogen (N) for the open ocean, and thus promotes marine productivity, in particular in the vast N-depleted regions of the surface ocean. Yet, the fate of the diazotroph-derived N (DDN) in marine ecosystems is poorly understood, and its transfer to auto- and heterotrophic surrounding plankton communities is rarely measured due to technical limitations. Moreover, the different diazotrophs involved in N2 fixation (Trichodesmium spp. vs. UCYN) exhibit distinct patterns of N2 fixation and inhabit different ecological niches,
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Meunier, Valentine, Sophie Bonnet, Mercedes Camps, et al. "Ingestion of Diazotrophs Makes Corals More Resistant to Heat Stress." Biomolecules 12, no. 4 (2022): 537. http://dx.doi.org/10.3390/biom12040537.

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Over the past decade, coral bleaching events have continued to recur and intensify. During bleaching, corals expel millions of their symbionts, depriving the host from its main food source. One mechanism used by corals to resist bleaching consists in exploiting food sources other than autotrophy. Among the food sources available in the reefs, dinitrogen (N2)-fixing prokaryotes or planktonic diazotrophs (hereafter called ‘PD’) have the particularity to reduce atmospheric dinitrogen (N2) and release part of this nitrogen (diazotroph-derived nitrogen or DDN) in bioavailable form. Here, we submitt
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Gimenez, Audrey, Melika Baklouti, Sophie Bonnet, and Thierry Moutin. "Biogeochemical fluxes and fate of diazotroph-derived nitrogen in the food web after a phosphate enrichment: modeling of the VAHINE mesocosms experiment." Biogeosciences 13, no. 17 (2016): 5103–20. http://dx.doi.org/10.5194/bg-13-5103-2016.

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Abstract. The VAHINE mesocosm experiment in the oligotrophic waters of the Nouméa lagoon (New Caledonia), where high N2 fixation rates and abundant diazotroph organisms were observed, aimed to assess the role of the nitrogen input through N2 fixation in carbon production and export and to study the fate of diazotroph-derived nitrogen (DDN) throughout the planktonic food web. A 1-D vertical biogeochemical mechanistic model was used in addition to the in situ experiment to enrich our understanding of the dynamics of the planktonic ecosystem and the main biogeochemical carbon (C), nitrogen (N) an
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Moreira-Coello, Víctor, Beatriz Mouriño-Carballido, Emilio Marañón, Ana Fernández-Carrera, María PÉrez-Lorenzo, and Antonio Bode. "Quantifying the overestimation of planktonic N2 fixation due to contamination of 15N2 gas stocks." Journal of Plankton Research 41, no. 4 (2019): 567–70. http://dx.doi.org/10.1093/plankt/fbz034.

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AbstractThe 15N2-tracer assay [Montoya et al. (1996) A simple, high-precision, high-sensitivity tracer assay for N2 fixation. Appl. Environ. Microbiol., 62, 986–993.] is the most used method for measuring biological N2 fixation in terrestrial and aquatic environments. The reliability of this technique depends on the purity of the commercial 15N2 gas stocks used. However, Dabundo et al. [(2014) PLoS One, 9, e110335.] reported the contamination of some of these stocks with labile 15N-labeled compounds (ammonium, nitrate and/or nitrite). The contamination of commercial 15N2 gas stocks with 15N-la
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Bonnet, Sophie, Melika Baklouti, Audrey Gimenez, Hugo Berthelot, and Ilana Berman-Frank. "Biogeochemical and biological impacts of diazotroph blooms in a low-nutrient, low-chlorophyll ecosystem: synthesis from the VAHINE mesocosm experiment (New Caledonia)." Biogeosciences 13, no. 15 (2016): 4461–79. http://dx.doi.org/10.5194/bg-13-4461-2016.

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Abstract. In marine ecosystems, biological N2 fixation provides the predominant external source of nitrogen (N; 140 ± 50 Tg N yr−1), contributing more than atmospheric and riverine inputs to the N supply. Yet the fate and magnitude of the newly fixed N, or diazotroph-derived N (hereafter named DDN) in marine ecosystems is poorly understood. Moreover, whether the DDN is preferentially and directly exported out of the photic zone, recycled by the microbial loop and/or transferred into larger organisms remains unclear. These questions were investigated in the framework of the VAHINE (VAriability
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Johnson, Claire, Lindsay L. Dubbs, and Michael Piehler. "Reframing the contribution of pelagic Sargassum epiphytic N2 fixation." PLOS ONE 18, no. 8 (2023): e0289485. http://dx.doi.org/10.1371/journal.pone.0289485.

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Though nitrogen fixation by epiphytic diazotrophs on pelagic Sargassum has been recognized for decades, it has been assumed to contribute insignificantly to the overall marine nitrogen budget. This six-year study reframes this concept through long-term measurements of Sargassum community nitrogen fixation rates, and by extrapolating mass-specific rates to a theoretical square meter portion of Sargassum mat allowing for comparison of these rates to those of other marine and coastal diazotrophs. On 24 occasions from 2015 to 2021, rates of nitrogen fixation were measured using whole fronds of Sar
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Church, Matthew J., Cindy M. Short, Bethany D. Jenkins, David M. Karl, and Jonathan P. Zehr. "Temporal Patterns of Nitrogenase Gene (nifH) Expression in the Oligotrophic North Pacific Ocean." Applied and Environmental Microbiology 71, no. 9 (2005): 5362–70. http://dx.doi.org/10.1128/aem.71.9.5362-5370.2005.

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ABSTRACT Dinitrogen (N2)-fixing microorganisms (diazotrophs) play important roles in ocean biogeochemistry and plankton productivity. In this study, we examined the presence and expression of specific planktonic nitrogenase genes (nifH) in the upper ocean (0 to 175 m) at Station ALOHA in the oligotrophic North Pacific Ocean. Clone libraries constructed from reverse-transcribed PCR-amplified mRNA revealed six unique phylotypes. Five of the nifH phylotypes grouped with sequences from unicellular and filamentous cyanobacteria, and one of the phylotypes clustered with γ-proteobacteria. The cyanoba
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Fernández, Ana, Rocío Graña, Beatriz Mouriño-Carballido, et al. "Community N2 fixation and Trichodesmium spp. abundance along longitudinal gradients in the eastern subtropical North Atlantic." ICES Journal of Marine Science 70, no. 1 (2012): 223–31. http://dx.doi.org/10.1093/icesjms/fss142.

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AbstractFernández, A., Graña, R., Mouriño-Carballido, B., Bode, A., Varela, M., Domínguez-Yanes, J. F., Escánez, J., de Armas, D., and Marañón, E. 2013. Community N2 fixation and Trichodesmium spp. abundance along longitudinal gradients in the eastern subtropical North Atlantic. – ICES Journal of Marine Science, 70:223–231. We have determined planktonic community N2 fixation, Trichodesmium abundance, the concentration and vertical diffusive flux of phosphate, and satellite-derived estimates of atmospheric concentration of dust along two longitudinal transects in the eastern subtropical North A
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Paul, A. J., E. P. Achterberg, L. T. Bach, et al. "No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community." Biogeosciences Discussions 12, no. 20 (2015): 17507–41. http://dx.doi.org/10.5194/bgd-12-17507-2015.

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Abstract. Nitrogen fixation by filamentous cyanobacteria supplies significant amounts of new nitrogen (N) to the Baltic Sea. This balances N loss processes such as denitrification and anammox and forms an important N source supporting primary and secondary production in N-limited post-spring bloom plankton communities. Laboratory studies suggest that filamentous diazotrophic cyanobacteria growth and N2-fixation rates are sensitive to ocean acidification with potential implications for new N supply to the Baltic Sea. In this study, our aim was to assess the effect of ocean acidification on diaz
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Stukel, M. R., V. J. Coles, M. T. Brooks, and R. R. Hood. "Top-down, bottom-up and physical controls on diatom-diazotroph assemblage growth in the Amazon River plume." Biogeosciences 11, no. 12 (2014): 3259–78. http://dx.doi.org/10.5194/bg-11-3259-2014.

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Abstract. The nutrient-rich waters of the Amazon River plume (ARP) support dense blooms of diatom-diazotroph assemblages (DDAs) that introduce large quantities of new nitrogen to the planktonic ecosystem and, unlike other nitrogen-fixers, are likely to directly fuel vertical carbon flux. To investigate the factors controlling DDA blooms, we develop a five phytoplankton (cyanobacteria, diatoms, unicellular microbial diazotrophs, DDAs, and Trichodesmium), two zooplankton model and embed it within a 1/6° resolution physical model of the tropical and subtropical Atlantic. The model generates reali
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Dissertations / Theses on the topic "Planktonic diazotrophs"

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Meunier, Valentine. "Interactions entre coraux scléractiniaires, les diazotrophes planctoniques et le picoplancton dans le contexte du changement climatique." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS332.

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Les coraux constructeurs de récifs, sont à la fois autotrophes (ils vivent en symbiose avec des microalgues de la famille des Symbiodiniaceae) et hétérotrophes, c’est à dire qu’ils sont capables de se nourrir sur une gamme de proies allant de la matière organique dissoute, au plancton. Les récifs coralliens sont menacés par le réchauffement climatique, qui perturbe la symbiose entre les coraux et leurs symbiontes, entraînant un blanchissement massif des coraux. Les diazotrophes planctoniques, capables de fixer le diazote (N2) atmosphérique en azote (N) biodisponible (l’ammonium, NH4+), et de t
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Drexel, Jan Peter. "Contribution of Nitrogen Fixation to Planktonic Food Webs North of Australia." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19733.

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Nitrogen fixation is no longer considered to be a minor factor of the nitrogen cycle in oceanic ecosystems. Recent geochemical and biological efforts have led to a significant increase in the estimated input of nitrogen to marine ecosystems by biological fixation, while molecular studies have increased our knowledge of the number and diversity of nitrogen fixers known to be active in the ocean. Although Trichodesmium spp. have long been viewed as the primary marine nitrogen fixers, recent efforts have shown that various members of the picoplankton community are also actively involved in nitr
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Gimenez, Audrey. "Etude des interactions entre diazotrophie, disponibilité nutritive et production planctonique dans l'océan de surface du pacifique tropical sud-ouest par une approche combinant observation et modélisation." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0208/document.

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Ce travail s'inscrit dans le cadre du projet OUTPACE visant à caractériser les eaux du Pacifique tropical Sud-Ouest (WTSP) en termes de stocks et flux biogéochimiques, et de diversité biologique des diazotrophes le long d'un transect longitudinal Ouest-Est. Il est le fruit de la combinaison étroite de deux approches, l'une expérimentale et l'autre basée sur la modélisation, dans le but d'étudier le rôle de la diazotrophie dans la dynamique planctonique et les cycles biogéochimiques des eaux de surface du WTSP. Les analyses de plusieurs grandeurs mesurées lors de la campagne, et notamment la pr
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Meakin, Nicholas G. "Metagenomic analyses of marine new production under elevated CO2 conditions." Thesis, University of Stirling, 2009. http://hdl.handle.net/1893/1555.

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A mesocosm experiment was carried out in a Norwegian fjord near Bergen in May 2006, with the main objective being the study of the effects of increasing concentrations of atmospheric CO2 (and associated effects such as increased acidification) on blooms of natural marine coastal plankton. Three mesocosms were bubbled with CO2(g) to achieve a high (~700ppm) CO2 concentration (pH ~7.8) to simulate predicted future conditions as a result of rising atmospheric CO2 concentrations. Another three mesocosms were treated as controls and bubbled with ambient air to represent a near pre-industrial scenar
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