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

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 m depth water column with almost no advection, at the DYFAMED site, N...

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Published in:Deep-sea research. Part II, Topical studies in oceanography Topical studies in oceanography, 2009-08, Vol.56 (18), p.1454-1469
Main Authors: Bourguet, Nicolas, Goutx, Madeleine, Ghiglione, Jean-François, Pujo-Pay, Mireille, Mével, Geneviève, Momzikoff, André, Mousseau, Laure, Guigue, Catherine, Garcia, Nicole, Raimbault, Patrick, Pete, Romain, Oriol, Louise, Lefèvre, Dominique
Format: Article
Language:English
Subjects:
Analysis of variance
Bacteria
Carbon
Communities
Community structure
DOM
Fatty acids
Lipase
Lipase activity
Lipids
Marine
Ocean, Atmosphere
Sciences of the Universe
Springs
Summer
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Summary: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 m 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 μM) (ANOVA, p
ISSN:0967-0645
1879-0100
DOI:10.1016/j.dsr2.2008.11.034