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Bacterial uptake of dissolved organic matter in relation to detrital aggregation in marine and freshwater systems
Paerl, H.W. (1974). Bacterial uptake of dissolved organic matter in relation to detrital aggregation in marine and freshwater systems. Limnol. Oceanogr. 19(6): 966-972
In: Limnology and Oceanography. American Society of Limnology and Oceanography: Waco, Tex., etc.. ISSN 0024-3590, more
Peer reviewed article  

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Keywords
    Bacteria; Detritus; Food conversion; Microorganisms; Suspended organic matter; Marine; Fresh water

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  • Paerl, H.W.

Abstract
    Microbial uptake of 3H-labeled glucose and acetate was studied in water samples from various depths in the Pacific Ocean and Lake Tahoe, California. Microzones of incorporation were identified by comparison of autoradiographic detection of the uptake of 3H-labeled organic substrates with scanning electron micrographs of detritus (nonliving particulate matter and associated microflora).In both freshwater and marine systems, immediate (within 4 hr) accumulation of dissolved organic compds was detected mainly in bacterial cells and filaments. With continued incubation, the label was dispersed throughout detrial particles, with localization greatest in bacteria. Uptake of both substrates y attached microorganisms was significantly higher in the euphotic than in the aphotic zone as was the extent of detrital aggregation. Autoadiographs show that dissolved organic substrates assimilated by bacteria are linked to the formation of capsular materials, which are important in building detrital aggregates.

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