Record Details

Distribution of baroduric, psychrotrophic and culturable nitrifying and denitrifying bacteria in the Central Indian Basin

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Distribution of baroduric, psychrotrophic and culturable nitrifying and denitrifying bacteria in the Central Indian Basin
 
Creator LokaBharathi, P.A.
PradeepRam, A.S.
Nair, S.
Nath, B.N.
Chandramohan, D.
 
Subject Abundance
Biogeochemical cycle
Microorganisms
Nitrites
Sediments
Nitrification
Denitrification
Geographical distribution
Bacteria
 
Description The abundance of baroduric, culturable nitrifying and denitrifying bacteria in the deep-sea cores of Central Indian Basin (CIB) at ca 5000 m depth was investigated. Analysis of 8 cores, sampled between 10 degrees 00 minutes S and 75 degrees 55 minutes-76 degrees 05 minutes E, showed that nitrifying bacteria were present in layers of sediment 0-25 cm below sea floor (bsf) with maximum numbers at sub-surface layers. Their average numbers ranged from 4.0 x 10 sup(4) to 2.43 x 10 sup(8) CFU g sup(-1) dry weight sediment and formed 0.21 and 4.30% of the total counts. Unusually high number of nitrifiers comprising of 40% of the total bacterial population have been encountered in one of the cores, namely CIB 16. Denitrifying bacterial population ranged from 0.02 to 2.57 x 10 sup(2) CFU g sup(-1) dry weight sediment and remained restricted to the surface sediment 0-4 bsf). The availability of organic carbon was found to be an important factor regulating the distribution of denitrifying and nitrifying bacteria in the sediment layers of CIB. While nitrifiers are negatively controlled by the organic matter, denitrifiers are positively controlled. Thus the widespread occurrence of nitrifying ability could be responsible for making oxygenated waters of the deep oceans including CIB net nitrifying and therefore rich in nitrate.
 
Date 2008-07-02T04:51:47Z
2008-07-02T04:51:47Z
2004
 
Type Conference Article
 
Identifier Proceedings of the National Seminar on New Frontiers in Marine Bioscience Research, January 22-23, 2004, Abidi, S.A.H.eds.; Ravindran, M.; Venkatesan, R.; Vijayakumaran, M. 319-330p.
http://drs.nio.org/drs/handle/2264/1115
 
Language en
 
Rights Copyright [2004]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
 
Publisher National Institute of Ocean Technology