Journal of Environmental Biology
pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
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Abstract - Issue Mar 2011, 32 (2) Back
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Seasonal variations in
abundance of nitrifying bacteria in fish pond ecosystem Author Details |
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National
Bureau of Fish Genetic Resources, |
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National Bureau of Fish Genetic Resources, e-mail: rathore69@rediffmail.com |
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School of Environmental Biology,
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National Bureau of Fish Genetic
Resources, |
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National Bureau of Fish Genetic
Resources, |
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Publication Data Paper received: 09 December 2009 Revised
received: 02 March 2010 Accepted: 20 April 2010 |
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 nitrite-oxidizing bacteria was highest during rainy
season. Key words Ammonia-oxidizing
bacteria, Nitrite-oxidizing bacteria, MPN, Fresh water pond |
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