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    Impact of seasonal changes in nutrient loading on distribution and activity of nitrifiers in a tropical estuary

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    Cont_Shel_Resr_154_37.pdf (1.125Mb)
    Date
    2018
    Author
    Vipindas, P.V.
    Anas, A.
    Jayalakshmy, K.V.
    Lallu, K.R.
    Benny, P.Y.
    Nair, S.
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    Abstract
    Estuaries are ecologically important environments, which function as the reception point of nitrogenous inputs of terrestrial and anthropogenic origin. In the present study, we discuss the influence of nutrient characteristics on the distribution and activity of nitrifiers in the water column of Cochin Estuary (CE), a tropical estuary along the southeast Arabian Sea (SEAS). Nitrifying bacteria (i.e. Ammonia- (AOB) and nitrite- (NOB) -oxidizing bacteria), which were enumerated using fluorescent in situ hybridization (FISH), showed marked seasonality while maintaining the abundance within an order of 107 cellsL?1. Denaturing Gradient Gel Electrophoresis (DGGE) analysis of AOB exhibited spatio-temporal adaptability without much variation. Nitrification rate in the CE ranged from 2.25 to 426.17 nmolNL?1h?1 and it was 10-40 fold higher during the pre-monsoon compared with the monsoon. We attributed this increase to high nutrient availability during pre-monsoon due to low flushing rate of the estuary. The study shows that the distribution and activities of nitrifiers in the CE are modulated by the changes in nutrient concentration imparted by the monsoon-driven seasonal variation in river-water discharge and flushing.
    URI
    https://doi.org/10.1016/J.CSR.2018.01.003
    http://drs.nio.org/drs/handle/2264/7716
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