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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Nov 2012, 33 (6)                                     Back


nstantaneous and historical temperature effects on a-pinene

Rhizobacterial population density and nitrogen fixation in seagrass

community of Gulf of Mannar, India

 

Author Details

 

S. Raja

Centre of Advanced Studies in Marine Biology, Faculty of Marine Sciences, Annamalai University,

Parangipettai-608 502, India ???????????

T.Thangaradjou

(Corresponding author)

Centre of Advanced Studies in Marine Biology, Faculty of Marine Sciences, Annamalai University,

Parangipettai-608 502, India

e-mail : umaradjou@gmail.com?

K.Sivakumar

Centre of Advanced Studies in Marine Biology, Faculty of Marine Sciences, Annamalai University,

Parangipettai-608 502, India

L. Kannan

Centre of Advanced Studies in Marine Biology, Faculty of Marine Sciences, Annamalai University,

Parangipettai-608 502, India

 

 

 

Publication Data

Paper received:

25 September 2010

 

Revised received:

09? September 2011

 

Accepted:

20? September 2011

 

Abstract

Seagrass rhizosphere generally supports high bacterial population density which plays a major role in determining the nutrient cycles of the sea. Higher densities of total heterotrophic bacteria (26.3 ?106?CFU g-1), nitrogen fixing (27.3 ?103?CFUg-1), ammonifying (44.66 X 106 MPN g-1) and nitrifying bacteria (42.33 X 106? MPN g-1?)? have been registered in the seagrass areas than the non seagrass area. In particular, all these rhizosphere microbial population was higher in Thalassia hemprichii. The rates of nitrogen fixation was recorded in the different species of seagrasses such as Enhalus acoroides (1.166 n mol g-1d-1), Halophila ovalis (0.166 n mol g-1d-1), Thalassia hemprichii (18.5 n mol g-1d-1), Cymodocea serrulata (10.5 n mol g-1d-1), Halodule uninervis (5.375 n mol g-1d-1) and Syringodium isoetifolium (0.666 n mol g-1d-1) using gas chromatography. The average nitrogen fixation by the seagrasses of Gulf of Mannar alone was estimated to be 7640.58 n mol m-2?d-1?and the contributions from the rhizosphere microbes will increase the quantity to many fold. ???

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Key words

Rhizosphere bacteria, Nitrogen fixation, Seagrasses, Gulf of Mannar

 

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