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Bacterial response to contrasting geochemistry in the sediments of central Indian Ocean basin

DRS at CSIR-National Institute of Oceanography

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Title Bacterial response to contrasting geochemistry in the sediments of central Indian Ocean basin
 
Creator Das, A.
Fernandes, C.E.G.
Naik, S.S.
Nath, B.N.
LokaBharathi, P.A.
 
Subject sediments
geochemistry
microbiology
ecosystems
benthic environment
ferromanganese nodules
environmental impact
topographic features
 
Description The latitudinal differences in geochemical and physiographic nature could evoke varied biological/microbiological response in the deep-sea benthic ecosystem of the Central Indian Ocean. Sediment cores have been examined along latitudinal gradient as a part of the Polymetallic Nodules- Environmental Impact Assessment Environmental Variability Data Collection (PMN-EIA-EVDC) programme. Two such examples of geochemically contrasting cores namely, TVBC-26 and TVBC-08R. Core TVBC-26 (10 degrees S, 75.5 degrees E) is more terrigenously influenced and falls in the siliceous sediment realm and has a relatively higher total organic carbon content (0.37%) are presented. Core TVBC-08R (16 degrees S, 75.7 degrees E) falling in the pelagic red clay realm down south is away from the influence of the terrigenous influx and has a lesser total organic carbon value (0.22%). Though the total abundance of bacteria was one order higher in TVBC-08R (1.4x10 super(9)) as compared to TVBC-26 (7.2x10 super(8)), the anaerobic viability was one order high in TVBC-26. The viability of bacteria under aerobic condition was marginally high in TVBC-08R. Cells were generally less than equal to 1mu m in core 08R and ranged from 1.5-1.8 mu m in core 26. Retrievability of bacteria was in the same order (10 super (4).g super(-1)) on different strengths of ZoBell Marine agar suggesting that the bacteria were nutritionally more versatile in core TVBC-08R. Besides, the retrievability of nitrifier was also one order more at this station. Super(14) C uptake at 5 degrees C for 30 hrs showed that core TVBC-08R exhibited more autotrophic potential with DPM values of 478+395. g super(-1) as compared to only 17 + or - 4 g super(-1) in core TVBC-26. Thus, under the influence of nutrient starved North Atlantic Deep-Waters the bacterial community at TVBC-08R are nutritionally more flexible as compared to that at TVBC-26, which is bathed by the nutrient-rich Antarctic Bottom Waters.
 
Date 2008-02-22T06:20:34Z
2008-02-22T06:20:34Z
2005
 
Type Conference Article
 
Identifier Proceedings of National Seminar on Polymetallic Nodules (PMN 2005), RRL, Bhubaneswar, 29-30 September, eds. Anand, S.; Sanjay, K. 1-8p.
http://drs.nio.org/drs/handle/2264/1000
 
Language en
 
Rights Copyright [2005]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher Regional Research laboratory, Bhubaneswar