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Tidal switch on metabolic activity: Salinity induced responses on bacterioplankton metabolic capabilities in a tropical estuary

DRS at CSIR-National Institute of Oceanography

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Title Tidal switch on metabolic activity: Salinity induced responses on bacterioplankton metabolic capabilities in a tropical estuary
 
Creator Thottathil, S.D.
Balachandran, K.K.
Jayalakshmy, K.V.
Gupta, G.V.M.
Nair, S.
 
Subject bacterioplankton
tropical estuary
salinity gradient
tidal cycle
 
Description Biolog plates were used to study the changes in the metabolic capabilities of bacterioplankton over a complete tidal cycle in a tropical ecosystem (Cochin Estuary, Kerala, India) along southwest coast of India. The pattern of utilization of carbon sources showed a definite shift in the community metabolism along a salinity gradient. Multivariate statistical analysis revealed two communities, namely allochthonous bacterioplankton sensitive to salinity and autochthonous bacterioplankton, which are tolerant to wide salinity fluctuations. Regression analysis showed salinity as the most important parameter influencing the physiological profile of bacterioplankton, irrespective of tide. Apart from salinity, limno-tolerant retrievable counts and halo-tolerant retrievable counts also accounted for the metabolic variation of bacterioplankton during low and high tides, respectively. The shift in the substrate utilization from carbohydrates to amino acids appears to be due to the physiological adaptation or nitrogen limitation of bacterial community with increasing salinity.
 
Date 2008-06-04T04:36:42Z
2008-06-04T04:36:42Z
2008
 
Type Journal Article
 
Identifier Estuarine, Coastal and Shelf Science, vol.78(4); 665-673p.
http://drs.nio.org/drs/handle/2264/1089
 
Language en
 
Rights Copyright Elsevier[2008]. 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 If it is brought to our notice that the rights are violated then the item would be withdrawn.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 Elsevier