Effects of hydrography on the distribution of bacteria and virus in Cochin estuary, India

Autor: K. V. Jayalakshmy, K. R. Naveen Kumar, Ammini Parvathi, K. R. Muraleedharan, Vijayan Jasna, N.V. Madhu, K.K. Balachandran, K. R. Lallu, S. Jina
Rok vydání: 2014
Předmět:
Zdroj: Ecological Research. 30:85-92
ISSN: 1440-1703
0912-3814
Popis: The viral dynamics have rarely been investigated in estuarine environments of India. The present study brings out a first hand information on the distribution of virus and bacteria in an eutrophic estuary (Cochin, India). Thirteen stations were selected for monthly monitoring of bacterial abundance (BA), total viable bacterial count (TVC), viral abundance (VA), chlorophyll a (Chl a) and other water quality parameters (temperature, salinity, pH, dissolved oxygen and inorganic nutrients such as NO3–N, NH4–N, PO4–P and SiO4–Si) for 1 year. There was significant variations in the VA [0.59–4.48 × 107viral like particles (VLPs) mL−1] and BA (0.49–8.12 × 106 cells mL−1) in the estuary. The variation in the viral to bacterial ratio (3–22) indicated marked seasonality. Statistical analysis showed bacteria as a major factor controlling the distribution of viruses (60 % variability) in Cochin estuary (CE). The viruses also showed positive correlations with Chl a, pH and salinity. The distribution of virus followed a distinct pattern of three different zones in the estuary controlled by salinity in zone I, Chl a in zone II and salinity, Chl a in zone III. The zonal distribution suggests that the factors that control the viral-host systems vary in different areas due to the complex hydrography of the estuary and environmental changes are very sensitive to the viral population in CE.
Databáze: OpenAIRE
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