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The response of a natural phytoplankton community from the Godavari River Estuary to increasing CO2 concentration during the pre-monsoon period

DRS at CSIR-National Institute of Oceanography

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Title The response of a natural phytoplankton community from the Godavari River Estuary to increasing CO2 concentration during the pre-monsoon period
 
Creator Biswas, H.
Cros, A.
Yadav, K.
Ramana, V.V.
Prasad, V.R.
Acharyya, T.
Babu, P.V.R.
 
Subject phytoplankton
carbon dioxide
tropical estuary
 
Description The effects of increasing CO sub(2) concentrations on a natural phytoplankton assemblage in a tropical estuary (Godavari, India) is reported. Two short-term (5-day) bottle experiments were conducted (with and without nutrient addition) during the pre-monsoon season when the partial pressure of CO sub(2) in the surface water is quite low. The concentrations of total chlorophyll, the phytoplankton growth rate, the concentrations of particulate organic matter, the photosynthetic oxygen evolution rates, and the total bacterial count were higher under elevated CO sub(2) treatments, as compared to ambient conditions (control). delta sup(13)C of particulate organic matter (POM) varied inversely with respect to CO sub(2), indicating a clear signature of higher CO sub(2) influx under the elevated CO sub(2) levels. Whereas, delta sup(13)C sub(POM) in the controls indicated the existence of an active bicarbonate transport system under limited CO sub(2) supply. A mass balance calculation indicated that insufficient nutrients (N, P and Si) might have inhibited diatom growth compared to cyanobacteria, regardless of increased CO sub(2) supply. The present study suggests that CO sub(2) concentration and nutrient supply could have significant effects on phytoplankton physiology and community composition for natural phytoplankton communities in this region
 
Date 2011-09-19T10:25:09Z
2011-09-19T10:25:09Z
2011
 
Type Journal Article
 
Identifier Journal of Experimental Marine Biology and Ecology, vol.407; 2011; 284?293
http://drs.nio.org/drs/handle/2264/3918
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2011] Elsevier
 
Publisher Elsevier