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Enhanced abundance of tintinnids under elevated CO2 level from coastal Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Enhanced abundance of tintinnids under elevated CO2 level from coastal Bay of Bengal
 
Creator Biswas, H.
Gadi, S.D.
Venkataramana, V.
Bharathi, M.D.
Priyan, R.K.
Manjari, D.T.
DileepKumar, M.
 
Subject zooplankton
coasts
carbon dioxide
microzooplankton
 
Description The role of microzooplankton (MZP) in the pelagic trophodynamics is highly significant, but the responses of marine MZP to increasing CO2 levels are rather poorly understood. Hence the present study was undertaken to understand the responses of marine plankton to increasing CO2 concentrations. Natural water samples from the coastal Bay of Bengal were incubated under the ambient condition and high CO2 levels (703-711 latm) for 5 days in May and June 2010. A significant negative correlation was obtained between phytoplankton and MZP abundance which indicated that phytoplankton community structure can considerably be controlled by MZP in this region. The average relative abundances of tintinnids under elevated CO2 levels were found to be significantly higher (68.65 + or -5.63% in May; 85.46 + or -9.56% in June) than observed in the ambient condition (35.68 + or -6.83% in May; 79 + or -5.36% in June). The observed dominance of small chain forming diatom species probably played a crucial role as they can be potentially grazed by tintinnids. This fact was strengthened by the observed high negative correlations between the relative abundance of major phytoplankton and tintinnids. Moreover, particulate organic carbon and total bacterial counts were also enhanced under elevated CO2 level and can serve as additional food source for ciliates. The observed responses of tintinnids to increasing CO2 might have multiple impacts on the energy transfer, nutrient and carbon cycling in the coastal water. The duration of the present study was relatively short and therefore further investigation on longer time scale needs to be done and might give us a better insight about phytoplankton and MZP species succession under elevated CO2 level.
 
Date 2012-05-07T05:55:53Z
2012-05-07T05:55:53Z
2012
 
Type Journal Article
 
Identifier Biodiversity and Conservation, vol.21; 2012; 1309-1326
no
http://drs.nio.org/drs/handle/2264/4042
 
Language en
 
Relation Biodivers_Conserv_21_1309.jpg
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2012] Springer.
 
Publisher Springer