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Intra-annual variability in nutrients in the Godavari estuary, India

DRS at CSIR-National Institute of Oceanography

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Title Intra-annual variability in nutrients in the Godavari estuary, India
 
Creator Sarma, V.V.S.S.
Prasad, V.R.
Kumar, B.S.K.
Rajeev, K.
Devi, B.M.M.
Reddy, N.P.C.
Sarma, V.V.
DileepKumar, M.
 
Subject primary production
nutrient cycles
river discharge
 
Description Daily variations in nutrients were monitored for 15 months (September 2007-November 2008) in the Godavari estuary, Andhra Pradesh, India, at two fixed locations. River discharge has significant influence on nutrients loading to the estuary, which peaks during June-August (peak discharge period; monsoon) whereas exchanges at the sediment-water interface, groundwater and rainwater contribute significantly during other period. Despite significant amount of nutrients brought by discharge to the study region, phytoplankton biomass, in terms of chlorophyll-a (Chl a), did not increase significantly due to high suspended load and shallow photic depth. Nutrients showed downward gradient towards downstream of the estuary from upstream due to dilution by nutrient poor seawater and biological uptake. The N:P ratios were higher than Redfield ratio in both upstream and downstream of the estuary during no discharge period suggesting PO sub(4) to be a limiting nutrient for phytoplankton production, at levels less than 0.10 mu mol L sup(-1). On the other hand, Si:N ratios were always more than unity during entire study period at both the stations indicating that Si(OH) sub(4) is not a limiting nutrient. Our results suggest that suspended matter limits phytoplankton biomass during peak discharge period whereas PO sub(4) during no discharge period.
 
Date 2010-11-29T12:43:48Z
2010-11-29T12:43:48Z
2010
 
Type Journal Article
 
Identifier Continental Shelf Research, vol.30(19); 2005-2014
http://drs.nio.org/drs/handle/2264/3753
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2010] Elsevier
 
Publisher Elsevier