Record Details

Microbial iron reduction and methane oxidation in subsurface sediments of the Arabian Sea

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Microbial iron reduction and methane oxidation in subsurface sediments of the Arabian Sea
 
Creator Fernandes, C.E.G.
Judith, M.
Gonsalves, M.J.B.D.
Nazareth, D.R.
Nagarchi, L.
Kamaleson, A.S.
 
Subject GEOLOGY AND GEOPHYSICS
CHEMISTRY AND BIOGEOCHEMISTRY
AQUATIC ECOLOGY, PRODUCTIVITY
 
Description Arabian Sea is one of the most productive regions of the world's ocean with seasonal upwelling and a characteristic oxygen minimum zone. It receives a continuous input of windborne iron-rich dust which possibly stimulates phytoplankton productivity. A sediment core from this area, which is on the western continental margin of India in the Kerala-Konkan basin was studied from the surface to 63 m below seafloor, to establish the co-occurrence of microbial iron reducing activity and methane oxidation. Total bacterial abundance (TC), viable aerobic counts accounting for aerobic and facultative anaerobes (TVCa), viable anaerobic counts (TVCan), methane, sulfate, ferrous [Fe(II], hydroxylamine extractable iron and HCl extractable iron concentrations were measured. Average TC was 52.6 ± 29.8 105 cells g-1 sediment while TVCa and TVCan were an order less. Methane and sulfate concentrations were 1.3 ppm and 23.2 mM, respectively. Average Fe(II) concentration, hydroxylamine and HCl extractable Fe was 0.32 ± 0.26, 0.86 ± 1.44 and 1.90 ± 2.47 mmol g-1 sediment, respectively. Interestingly, Fe(II) significantly correlated with TVCan (r = 0.66, p
 
Date 2015-08-26T04:54:51Z
2015-08-26T04:54:51Z
2015
 
Type Journal Article
 
Identifier Marine and Petroleum Geology, vol.67; 2015; 327-335
http://drs.nio.org/drs/handle/2264/4780
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2015] Elsevier
 
Publisher Elsevier