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Production de CO 2 à l'interface air‐mer. Une approche par l'étude des phénomènes respiratoires dans la microcouche de surface. CO 2 Production at the Sea‐Air Interface. An Approach by the Study of Respiratory Processes in Surface Microlayer
Author(s) -
Garabétian Frédéric
Publication year - 1990
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19900750208
Subject(s) - respiration , chemistry , environmental chemistry , oxygen , diffusion , heterotroph , zoology , biology , botany , bacteria , physics , organic chemistry , thermodynamics , genetics
Sea‐surface microlayer and underlaying water samples were collected in the Bay of Marseilles (France) in order to study respiratory activity of microneuston and its possible influence on respiratory CO 2 production. Three methods were tested: Biochemical Oxygen Demand (BOD) as an estimation of community respiration, Electron Transport System activity (ETS) and 14 C‐Glucose uptake monitored by 14 C‐CO 2 liberation. BOD and ETS data clearly showed enhanced respiratory activities (up to 310 μl O 2 /l/h) in surface‐films as compared to underlaying waters; moreover the slope of the linear regression between these data led to R/ETS value of 0.689 and provides evidence for the presence of an important heterotrophic fraction within the microneuston. Though 14 C‐Glucose measurements showed only a slight trend for higher total activity (incorporation + respiration) in surface microlayers, significant enhancement of relative 14 C‐CO 2 production giving rise to CO 2 diffusion across air‐water interface was observed.