Lipid biomarkers and bacterial lipase activities as indicators of organic matter and bacterial dynamics in contrasted regimes at the DYFAMED site, NW Mediterranean

N Bourguet, M Goutx, J F Ghiglione, M Pujo-Pay, G Mevel, A Momzikoff, L Mousseau, C Guigue, N Garcia, P Raimbault, Romain Pete, L Oriol, D Lefevre

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Abstract

This study investigated the relationships between dissolved organic matter (DOM) composition and bacterial dynamics on short time scale during spring mesotrophic (March 2003) and summer oligotrophic (June 2003) regimes, in a 0-500 in depth water column with almost no advection, at the DYFAMED site, NW Mediterranean. DOM was characterized by analyzing dissolved organic carbon (DOC), colored dissolved organic matter (CDOM) and lipid class biotracers. Bacterial dynamic was assessed through the measurement of in situ bacterial lipase activity, abundance, production and bacterial community structure. We made the assumption that by coupling the ambient concentration of hydrolysable acyl-lipids with the measurement of their in situ bacterial hydrolysis rates (i.e. the free fatty acids release rate) would provide new insights about bacterial response to change in environmental conditions. The seasonal transition from spring to summer was accompanied by a significant accumulation of excess DOC (+5 mu M) (ANOVA, p
Original languageEnglish
Pages (from-to)1454-1469
Number of pages16
JournalDEEP-SEA RES PT II
Volume56
Issue number18
DOIs
Publication statusPublished - 2009

Keywords

  • FLAME IONIZATION DETECTION
  • SEASONAL-VARIATIONS
  • SEAWATER MESOCOSMS
  • VERTICAL-DISTRIBUTION
  • RIBOSOMAL-RNA GENES
  • Oceanography
  • PHAEODACTYLUM-TRICORNUTUM
  • BACTERIOPLANKTON COMMUNITY STRUCTURE
  • COASTAL WATERS
  • MARINE ENVIRONMENTS
  • HETEROTROPHIC ACTIVITY

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    Bourguet, N., Goutx, M., Ghiglione, J. F., Pujo-Pay, M., Mevel, G., Momzikoff, A., Mousseau, L., Guigue, C., Garcia, N., Raimbault, P., Pete, R., Oriol, L., & Lefevre, D. (2009). Lipid biomarkers and bacterial lipase activities as indicators of organic matter and bacterial dynamics in contrasted regimes at the DYFAMED site, NW Mediterranean. DEEP-SEA RES PT II, 56(18), 1454-1469. https://doi.org/10.1016/j.dsr2.2008.11.034