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Response of phytoplankton to nutrient enrichment with high growth rates in a tropical monsoonal estuary - Zuari estuary, India

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Title Response of phytoplankton to nutrient enrichment with high growth rates in a tropical monsoonal estuary - Zuari estuary, India
 
Creator Mochemadkar, Sunita
Gauns, Mangesh
Pratihary, Anil
Thorat, Babasaheb
Roy, Rajdeep
Pai, I. K.
Naqvi, S. W. A.
 
Subject Zuari estuary
Premonsoon
Nutrient uptake
Phytoplankton
Hypoxic
 
Description 314-325
Present study is about the impact of macronutrient enrichment on
phytoplankton biomass and community structure in a tropical monsoonal estuary. In situ experiments carried out during
the pre-monsoon period (February-March 2006), showed that the response time of
phytoplankton to nutrient enhancement was 24-32 h. Phytoplankton biomass
increased sizably, indicating nitrate and silicate limitation for phytoplankton
growth. An increase in 23µg chl a l-1 resulted in an uptake
of
10µM nitrate, 0.6µM phosphate and 17µM silicate. Phytoplankton showed high
growth rates with an average value of
1.36µg chl l-1 d-1.This phytoplankton community was
largely dominated by diatoms (>96%), particularly chain forming species. Relative
preference index (RPI) value for nitrate was >1, suggesting that,
irrespective of the ambient ammonium concentration, estuarine autotrophs
preferred nitrate. Few species like Skeletonema
costatum and Thalassionema
nitzschioides exhibited the ability to withstand hypoxic condition.


 
Date 2013-07-12T09:59:49Z
2013-07-12T09:59:49Z
2013-06
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/19660
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.42(3) [June 2013]