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Accueil > Pages Perso > Jonathan Gervaix

Plateforme AME

Jonathan Gervaix

Technicien

Activité

Activités principales

  • Mesures d’activités enzymatiques microbiennes sur souches/sols/sédiments
  • Compilation des résultats
  • Surveillance et maintenance des appareils
  • Gestion des stocks de consommables et commandes
  • Organisation du planning d’utilisation de la plateforme
  • Participation à des campagnes de prélèvement sur le terrain
  • Développement de protocoles

Activités secondaires

  • Membre du conseil de Laboratoire
  • Membre du conseil de Département de Biologie

Parcours scientifique

  • Technicien de recherche et d’enseignement, Laboratoire d’Ecologie Microbienne- Lyon depuis Octobre 2015
  • Assistant-Ingénieur en Ecologie Microbienne, Laboratoire d’Ecologie Microbienne- Lyon (Janvier-Octobre 2015)
  • Technicien de laboratoire, Institut des Sciences Analytiques/IRSTEA (Octobre 2013-Décembre 2014)
  • DUT Génie Biologique option Agronomie (Septembre 2013)

Enseignement/Encadrement

  • Préparation et encadrement technique de Travaux Pratiques en Master 1
  • Formation technique d’étudiants et de stagiaires aux techniques de mesures de la plateforme

Publications

2018



  • Srikanthasamy, T., Leloup, J., N'Dri, A.B., Barot, S., Gervaix, J., Koné, A.W., Koffi, K.F., Le Roux, X., Raynaud, X., Lata, J.-C., 2018. Contrasting effects of grasses and trees on microbial N-cycling in an African humid savanna. Soil Biology and Biochemistry 117, 153-163. https://doi.org/10.1016/j.soilbio.2017.11.016
    Résumé : African humid savannas are highly productive ecosystems, despite very low soil fertility, where grasses and trees coexist. Earlier results showed that some perennial grass species are capable of biological nitrification inhibition (BNI) while trees likely influence differently on nitrogen cycling. Here we assessed the impact of the dominant grass and tree species of the Lamto savanna (Ivory Coast) on soil nitrifying and denitrifying enzyme activities (NEA and DEA, respectively) and on the abundances of archaeal and bacterial ammonia oxidizers (AOA and AOB, respectively) and nitrite reducers. This is one of the first studies linking nitrifying and denitrifying activities and the abundances of the involved groups of microorganisms in savanna soils. NEA was 72-times lower under grasses than under trees while AOA and AOB abundances were 34- and 3-times lower. This strongly suggests that all dominant grasses inhibit nitrification while trees stimulate nitrification, and that archaea are probably more involved in nitrification than bacteria in this savanna. While nitrite reducer abundances were similar between locations and dominated by nirS genes, DEA was 9-times lower under grasses than trees, which is likely explained by BNI decreasing nitrate availability under grasses. The nirS dominance could be due to the ferruginous characteristics of these soils as nirS and nirK genes require different metallic co-enzymes (Fe or Cu). Our results show that the coexistence of grasses and trees in this savanna creates a strong heterogeneity in soil nitrogen cycling that must be considered to understand savanna dynamics and functioning. These results will have to be taken into account to predict the feedbacks between climate changes, nitrogen cycling and tree/grass dynamics at a time when savannas face worldwide threats.
    Mots-clés : #5, #AME, Biological nitrification inhibition (BNI), Denitrification, Nitrification, Perennial grasses, Trees, Tropical savanna.

2017



  • Assémien, F.L., Pommier, T., Gonnety, J.T., Gervaix, J., Le Roux, X., 2017. Adaptation of soil nitrifiers to very low nitrogen level jeopardizes the efficiency of chemical fertilization in west african moist savannas. Scientific Reports 7. https://doi.org/10.1038/s41598-017-10185-5
    Mots-clés : #5.


  • Florio, A., Pommier, T., Gervaix, J., Bérard, A., Le Roux, X., 2017. Soil C and N statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities. Scientific Reports 7. https://doi.org/10.1038/s41598-017-08589-4
    Mots-clés : #5.

Chapitre d’ouvrages

Vulgarisation

Communications Orales

2016

  • Cantarel, A.A.M., Andrieu, B., Allard, V., Enjalbert, J., Gervaix, J., Saint Jean, S., Pommier, T., Pope, C., Le Roux, X., 2016. Effects of agricultural wheat selection on plant trait variability and trait syndromes, dans: .
    Mots-clés : #5, #AME, #colloque.
  • Florio, A., Pommier, T., Gervaix, J., Le Roux, X., 2016. Can we manage plant-microbes interactions belowground to increase the sustainability of cropping systems? The case of maize seed inoculation with the beneficial Azospirillum lipoferum CRT1 and its effects on the N-cycling rhizospheric microbial communities, dans: . Présenté à EcoSummit 2016 Ecological Sustainability.
    Mots-clés : #5, #AME, #colloque.
  • Hugoni, M., Cantarel, A.A.M., Allard, V., Enjalbert, J., Gervaix, J., Saint Jean, S., Pommier, T., Le Roux, X., 2016. Increasing wheat variety diversity within cropped fields can channel soil N dynamics in a favourable status for the sustainability of cropping systems, dans: .
    Mots-clés : #5, #AME, #colloque.

Posters

2016

  • Crouzet, O., GOULAS, A., Richaume, A., Marrauld, C., Gervaix, J., Haudin, C.S., Benoit, P., Nazaret, S., 2016. Impact écotoxicologique d’un antibiotique sur les processus microbiens du cycle de l’azote, dans des sols amendés par des produits résiduaires organiques.
    Mots-clés : #AME, #poster.
  • Lecomte, S., Haichar, F.Z., Guyonnet, J.P., Diel, B., Gervaix, J., Hommais, F., 2016. Denitrification And Its Regulation In Agrobacterium fabrum C58.
    Mots-clés : #AME, #poster.
  • Vautrin, F., Le Floch, A., Gutbraut, E., Bergeron, E., Marjolet, L., Gleizal, A., Gervaix, J., Cournoyer, B., Winiarski, T., Rodriguez-Nava, V., 2016. Nocardia, un pathogène au fil de l’eau.
    Mots-clés : #6, #AME, #poster.

2015

  • Gervaix, J., Poly, F., Breil, P., Namour, P., 2015. Measuring of the bacterial gaseous emission in river sediment.
    Mots-clés : #AME, #poster.
  • Jobin, L., Pommier, T., Jose, C., Pages, C., Gervaix, J., Raffin, G., Namour, P., 2015. Influence of external resistor on denitrifying activity of a pure strain of Pseudomonas stutzeri in Microbial Fuel Cell.
    Mots-clés : #AME, #poster.