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Title: Seasonal and diurnal variation of hydrobiological characters of coastal water of Chennai (Madras), Bay of Bengal
Authors: Subramanian, B
Mahadevan, A
Issue Date: Dec-1999
Publisher: NISCAIR-CSIR, India
Abstract: Seasonal and diurnal variations in the hydrobiological characters of coastal water of southern Chennai, Bay of Bengal were studied. Parameters such as current, pH, salinity, inorganic nutrients, (NH4, NO2, NO3, PO4, SiO3- SiO2) and heavy metals exhibited unimodal oscillation and temperature, dissolved oxygen (DO), biological oxygen demand (BOD) and suspended solids exhibited bimodal oscillation. Particulate organic carbon (POC) was positively correlated with suspended solids. Chlorophyll-a (chl-a) and phytoplankton density showed two maxima; one in summer and another in southwest monsoon season and minimum value during the northeast monsoon. Productivity was low in northeast monsoon compared with other seasons. Temperature, dissolved oxygen (DO), chlorophyll-a (chl-a) and productivity increased in the day time and vice versa for inorganic nutrients. Low tide brought more nutrients and less saline water from the estuarine region; high tide brought more chl-a from the offshore water. All the parameters were highly influenced by monsoonal rain, littoral drift and land drainage in a season but diurnal variation was due to the combination of more than one factors.
Page(s): 429-433
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.28(4) [December 1999]

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