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Relationship of sediment-biochemistry, bacterial morphology, and activity to geotechnical properties in the central Indian Basin

DRS at CSIR-National Institute of Oceanography

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Title Relationship of sediment-biochemistry, bacterial morphology, and activity to geotechnical properties in the central Indian Basin
 
Creator Naik, S.S.
Khadge, N.H.
Valsangkar, A.B.
Das, A.
Fernandes, C.E.G.
LokaBharathi, P.A.
 
Subject GEOLOGY AND GEOPHYSICS
MICROBIOLOGY
GEOLOGY AND GEOPHYSICS
 
Description Distribution of biochemical properties, morphological and functional characteristics of bacteria in the extreme sedimentary environment of the Central Indian Basin (CIB) was examined in relation to geotechnical properties and sediment texture. Interrelationships between these parameters in siliceous northern sediments were compared to southern pelagic clay to understand relationships and to appreciate mining implications. Clay impacted lipids negatively and silt positively in the south. Geotechnical properties had the opposite influence on the distribution of coccoidal and rod forms of bacteria. Rods were affected negatively by water content/porosity and positively by wet bulk density in the north suggesting their preference for deeper niches. Shear strength affected coccoidal distribution negatively in the south. Competition for labile substrates by coccoidal forms in the surface layers could also have restricted the rods to the deeper regions. Principal component analysis (PCA) further strengthened our inference that the distribution of rod forms increased with depth. Enzymatic properties of bacterial isolates also showed that the rods were able to degrade substrates like gelatin and DNA. These observations suggest that they are capable of degrading relatively more recalcitrant compounds in the deeper layers. The minor components, like the rod morphotypes and sand content, could wield a large influence on the variability of other parameters.
 
Date 2016-02-04T04:45:47Z
2016-02-04T04:45:47Z
2016
 
Type Journal Article
 
Identifier Marine Georesources & Geotechnology, vol.34(1); 2016; 21-32
http://drs.nio.org/drs/handle/2264/4899
 
Language en
 
Rights The final and definitive form of the preprint has been published in the "Marine Georesources & Geotechnology" © 2015 Taylor & Francis; "Marine Georesources & Geotechnology" is available online at http://www.tandfonline.com with open URL of article : http://dx.doi.org/10.1080/1064119X.2014.954680. The term & condition associated with this preprint is at http://www.tandfonline.com/page/terms-and-conditions
 
Publisher Taylor & Francis