Relationship of Sediment-Biochemistry, Bacterial Morphology, and Activity to Geotechnical Properties in the Central Indian Basin

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...

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Bibliographic Details
Published in:Marine georesources & geotechnology 2016-01, Vol.34 (1), p.21-32
Main Authors: Naik, Sonali Shyam, Khadge, N. H., Valsangkar, A. B., Das, Anindita, Fernandes, Christabelle E. G., Loka Bharathi, P. A.
Format: Article
Language:English
Subjects:
Bacteria
Biochemical distribution
Biochemistry
Central Indian Basin
deep-sea bacteria
Degradation
Geological engineering
Geomorphology
geotechnical properties
Geotechnics
Marine
Marine geology
Rods
Sand
sediment texture
Sediments
Surface layer
Texture
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Summary: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.
ISSN:1064-119X
1521-0618
DOI:10.1080/1064119X.2014.954680