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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
Abstract 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.