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dc.contributor.authorKhodse, V.B.
dc.contributor.authorBhosle, N.B.
dc.date.accessioned2011-10-10T05:29:44Z
dc.date.available2011-10-10T05:29:44Z
dc.date.issued2011
dc.identifier.citationAquatic Microbial Ecology, vol.64; 2011; 299-309
dc.identifier.otherno
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/3931
dc.description.abstractDissolved organic matter (DOM) is an important source of organic carbon for sustaining the growth of heterotrophic bacteria. The bacterial utilization of high-molecular-weight (HMW; greater than 30 kDa to 0.22 mu m) and low-molecular-weight (LMW; greater than10 to 30 kDa) fractions of DOM was investigated. DOM was collected from a station in Dona Paula Bay, on the west coast of India, and fractionated into HMW and LMW portions. Each size fraction was inoculated with a natural population of bacteria and incubated over a period of 15 d at room temperature (28 + or - 2 degrees C); during this period, sub-samples were removed and the following were measured: dissolved organic carbon (DOC), total dissolved carbohydrate (TDCHO), free monosaccharide (MCHO), dissolved uronic acid (DURA), delta13C, bacterial abundance (BA), and bacterial production (BP). The LMW fraction was isotopically heavier (delta13C = −23.7 to −21.7ppt) than the HMW fraction (delta13C = −27.0 to −26.2ppt), and the initial TDCHO content of these fractions was 25 and 16%, respectively. The initial DURA content was similar in the LMW DOM (7.4% DOC) and the HMW DOM (7.0% DOC). BA and BP were consistently higher in the LMW DOM than in the HMW DOM. In 15 d incubation, greater proportions of DOC (35%), TDCHO (76%) and DURA (36%) were utilized in the LMW DOM than in the HMW DOM. This suggests that the LMW DOM was more biologically reactive, i.e. it was utilized more rapidly, than the HMW DOM. It appears that the bioreactivity and origin of the DOM strongly influenced its utilization by natural heterotrophic bacteria.
dc.language.isoen
dc.publisherInter-Research
dc.relation.requiresAquat_Microb_Ecol_64_299.jpg
dc.rightsAn edited version of this paper was published by Inter-Research. © Inter-Research 2011
dc.subjectdissolved organic matter
dc.subjectpolysaccharides
dc.subjectprimary production
dc.subjectbacteria
dc.titleBacterial utilization of size-fractionated dissolved organic matter
dc.typeJournal Article


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