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http://nopr.niscpr.res.in/handle/123456789/19660| Title: | Response of phytoplankton to nutrient enrichment with high growth rates in a tropical monsoonal estuary - Zuari estuary, India |
| Authors: | Mochemadkar, Sunita Gauns, Mangesh Pratihary, Anil Thorat, Babasaheb Roy, Rajdeep Pai, I. K. Naqvi, S. W. A. |
| Keywords: | Zuari estuary;Premonsoon;Nutrient uptake;Phytoplankton;Hypoxic |
| Issue Date: | Jun-2013 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | 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. |
| Page(s): | 314-325 |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Appears in Collections: | IJMS Vol.42(3) [June 2013] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJMS 42(3) 314-325.pdf | 658.66 kB | Adobe PDF | View/Open |
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