Journal Metrics

  • IF value: 3.753 IF 3.753
  • IF 5-year<br/> value: 4.644 IF 5-year
    4.644
  • SNIP value: 1.376 SNIP 1.376
  • IPP value: 4.067 IPP 4.067
  • SJR value: 2.451 SJR 2.451
  • h5-index value: 57 h5-index 57
Biogeosciences, 8, 1839-1852, 2011
www.biogeosciences.net/8/1839/2011/
doi:10.5194/bg-8-1839-2011
© Author(s) 2011. This work is distributed
under the Creative Commons Attribution 3.0 License.
Microbial food webs and metabolic state across oligotrophic waters of the Mediterranean Sea during summer
U. Christaki1, F. Van Wambeke2, D. Lefevre2, A. Lagaria1,3, L. Prieur4,8, M. Pujo-Pay5,6, J.-D. Grattepanche1, J. Colombet7, S. Psarra3, J. R. Dolan4,8, T. Sime-Ngando7, P. Conan5,6, M. G. Weinbauer4,8, and T. Moutin9
1INSU-CNRS, UMR8187 LOG, Laboratoire d'Océanologie et des Géosciences, Université Lille Nord de France, ULCO, 32 avenue Foch, 62930 Wimereux, France
2INSU-CNRS, UMR6117, LMGEM, Laboratoire de Microbiologie, Géochimie et Ecologie Marines, Université de la Méditerranée, Centre d'Océanologie de Marseille, Campus de Luminy Case 901, 13 288 Marseille cedex 9, France
3Hellenic Centre for Marine Research, Institute of Oceanography, 71003 Heraklion, Crete, Greece
4INSU-CNRS, UMR7093 LOV, Laboratoire d'Océanographie de Villefranche, Observatoire Océanologique de Villefranche-sur-Mer, 06 238 Villefranche-sur-Mer, France
5INSU-CNRS, UMR7621, Lab. d'Océanographie Microbienne, Observatoire Océanologique, 66651 Banyuls/mer, France
6UPMC Univ Paris 06, UMR7621, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, 66651 Banyuls/mer, France
7INSU-CNRS, UMR6023, LMGE, Laboratoire Microorganismes: Génome et Environnement – 63177 Aubière cedex, France
8UPMC Univ Paris 06, UMR7093, Laboratoire d'Océanographie de Villefranche, Observatoire Océanologique de Villefranche-sur-Mer, 06230 Villefranche-sur-Mer, France
9INSU-CNRS, UMR6535, LOPB, Laboratoire d'Océanographie physique et biogéochimique Université de la Méditerranée, Centre d'Océanologie de Marseille, Campus de Luminy Case 901, 13 288 Marseille cedex 9, France

Abstract. The abundance and activity of the major members of the heterotrophic microbial community – from viruses to ciliates – were studied along a longitudinal transect across the Mediterranean Sea in the summer of 2008. The Mediterranean Sea is characterized by a west to-east gradient of deepening of DCM (deep chlorophyll maximum) and increasing oligotrophy reflected in gradients of biomass and production. However, within this well documented longitudinal trend, hydrological mesoscale features exist and likely influence microbial dynamics. Here we present data from a W-E transect of 17 stations during the period of summer stratification. Along the transect the production and fate of organic matter was investigated at three selected sites each one located in the centre of an anticyclonic eddy: in the Algero-Provencal Basin (St. A), the Ionian Basin (St. B), and the Levantine Basin (St. C). The 3 geographically distant eddies showed low values of the different heterotrophic compartments of the microbial food web, and except for viruses in site C, all integrated (0–150 m) stocks were higher in reference stations located in the same basin outside the eddies. During our study the 3 eddies showed equilibrium between GPP (Gross Primary Production) and DCR (Dark Community Respiration). Integrated PPp (Particulate Primary Production) values at A, B and C varied from ~140 to ~190 mg C m−2.

Citation: Christaki, U., Van Wambeke, F., Lefevre, D., Lagaria, A., Prieur, L., Pujo-Pay, M., Grattepanche, J.-D., Colombet, J., Psarra, S., Dolan, J. R., Sime-Ngando, T., Conan, P., Weinbauer, M. G., and Moutin, T.: Microbial food webs and metabolic state across oligotrophic waters of the Mediterranean Sea during summer, Biogeosciences, 8, 1839-1852, doi:10.5194/bg-8-1839-2011, 2011.
 
Search BG
Final Revised Paper
PDF XML
Citation
Discussion Paper
Share