Seasonal variations in abundance of nitrifying bacteria in fish pond ecosystem.
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Date
2011-03
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Abstract
Seasonal changes in abundance of nitrifiers (ammonia-oxidizing and nitrite-oxidizing bacteria) in surface and
bottom water of freshwater ponds were examined with respect to temperature, DO, pH as well as concentration
of ammonia and nitrite. The most probable number (MPN) of ammonia-oxidizers in different ponds varied from
1297±3.6 to 1673.23±0.36 ml-l in bottom and 720.5±8.1 to 955.3±10.8 ml-l in surface water during the rainy
season while the MPN ranged from 1074±1.07 to 1372.17±4.6 ml-l in bottom and 515±10.1 to 678±11.8 ml-l in
surface water in winter. However, the MPN were greatly reduced in summer and ranged from 435.05±15.7 to
547.54±2.12 ml-l in bottom and 218.7±7.3 to 368.4±9.32 ml-l in surface water. Similar seasonal trends were also
observed in MPN of nitrite-oxidizers. Among all the physico-chemical parameters, abundance of nitrifiers was
more positively correlated with ammonia and nitrite concentration in all the seasons. The abundance of nitrifiers
in surface and bottom water was highest in rainy season followed by winter and modest in summer. The potential
nitrification activities and oxidation rates were shown to be linear and activity of ammonia-oxidizing and nitriteoxidizing
bacteria was highest during rainy season.
Description
Keywords
Ammonia-oxidizing bacteria, Nitrite-oxidizing bacteria, MPN, Fresh water pond
Citation
Kumari Vibha, Rathore Gaurav, Chauhan U K, Pandey A K, Lakra W S. Seasonal variations in abundance of nitrifying bacteria in fish pond ecosystem. Journal of Environmental Biology. 2011 Mar; 32(2): 153-159.