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

DRS at CSIR-National Institute of Oceanography

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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, S.
Gauns, M.
Pratihary, A.K.
Thorat, B.R.
Roy, R.
Pai, I.K.
Naqvi, S.W.A.
 
Subject plant nutrition
hypoxia
nutrients (mineral)
phytoplankton
biomass
fluorimeters
 
Description 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 23 Mew g chl a l sup (-1) resulted in an uptake of 10 Mew M nitrate, 0.6 Mew M phosphate and 17 Mew M silicate. Phytoplankton showed high growth rates with an average value of 1.36 Mew g chl l sup (-1) d sup (-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 2013-08-07T12:14:41Z
2013-08-07T12:14:41Z
2013
 
Type Journal Article
 
Identifier Indian Journal of Geo-Marine Sciences, vol.42(3); 2013; 314-325
http://drs.nio.org/drs/handle/2264/4334
 
Language en
 
Rights © IJMS/NISCAIR 2013. CC Attribution 3.0 License (CC BY 3.0)
 
Publisher CSIR-NISCAIR