Show simple item record

dc.contributor.authorKrishnan, K.P.
dc.contributor.authorSinha, R.K.
dc.contributor.authorNair, S.
dc.contributor.authorNoronha, S.B.
dc.contributor.authorChacko, R.
dc.contributor.authorAnilkumar, N.
dc.date.accessioned2016-05-13T10:59:21Z
dc.date.accessioned2017-09-30T03:12:36Z
dc.date.available2016-05-13T10:59:21Z
dc.date.available2017-09-30T03:12:36Z
dc.date.issued2015
dc.identifier.citationAnnals of Microbiology, vol.65(2); 2015; 1027-1036
dc.identifier.issn1590-4261
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/7651
dc.description.abstractBacterial production, respiration and metabolic di- versity were measured up to 120 m depth in the Sub-Antarctic Front (SAF) and Polar Fronts I and II (PFI and PFII) of the Indian Ocean sector of the Southern Ocean during 2010 Austral Summer. Prokaryotic cell count was maximum at PFI and PFII (~10 9 cells L −1 ) and minimum at SAF (~10 7 cells L −1 ). Furthermore, integrated bacterial production was higher at PFI (1.07 mg C m −2 h −1 ) and PFII (0.72 mg C m −2 h −1 ) compared to SAF (0.61 mg C m −2 h −1 ). At PFII, integrated bacterial growth efficiency was higher (8.96) com- pared to PFI (7.42) and SAF (7.17), signifying that the net contribution of PFII to the microbial loop could be relatively pronounced. Enhanced cell numbers and production at polar fronts indicate that the dissolved organic matter could be converted to secondary biomass through the microbial loop. However, integrated bacterial respiration rate at PFII (0.83 mg C m −2 h −1 ) was lower than that at PFI (1.84 mg C m −2 h −1 ) resulting in higher growth efficiency at PFII. Metabolic flex- ibility at SAF was clearly brought about by utilization of carboxylic acids like D-malic acid and itaconic acid, and carbohydrates like N-acetyl D-glucosamine, D-cellobiose and D-lactose. Utilization of amino acids like glycyl L- glutamic acid and L-threonine, and an amine, phenylethyl- amine, was critical in determining the metabolic variability at PFI. PFII hosted microbes that utilized phenolic compounds (2-hydroxy benzoic acid and 4-hydroxy benzoic acid) and polymers (like Tween 80). Utilization of polyols over carbo- hydrates in polar waters indicates a niche with lesser influence of the Antarctic melt waters on the bacterioplankton metabolism.
dc.languageen
dc.publisherSpringer
dc.relation.ispartofAnn Microbiol
dc.relation.isreferencedbySCI
dc.subjectMicrobiology
dc.subjectAquatic Ecology, Productivity
dc.subject.otherPrimary productivity
dc.subject.otherNanoplankton
dc.subject.otherEnergy flow
dc.subject.otherISW, Indian Ocean
dc.titleCarbon demand, utilization, and metabolic diversity of bacterioplankton in the frontal regimes of the Indian sector of the Southern Ocean
dc.typeJournal Article
dc.affiliation.authorNational Centre for Antarctic and Ocean Research, Vasco da Gama, Goa, India


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record