Baseline ecology of Edaiyur - Sadras Part 1: General hydrographic and chemical feature estuarine system at Kalpakkam

K.V.K. Nair, S. Ganapathy

Abstract



Hydrographic and ecological investigations in Edaiyur and Sadras backwaters, Tamil Nadu, India and coastal waters showed that the surface temperature data from the water bodies were characterised by maxima in April and October and minima in January and July. From the seasonal salinity variations Sadras could be considered as a 'positive' estuary throughout the year and Edaiyur as 'positive' from August to March and 'negative' from April to July. Distribution of seston was characterised by maxima in July (35.5 mg/l) and April (42.9 mg/l) in Sadras and in July (58.3 mg/l) and November (33.7 mg/l) in coastal waters. Secchi disc depth data showed a water transparency maximum in Sadras in December, Edaiyur in October and two maxima in March and October in coastal waters. Silicates were higher in backwaters than in coastal waters. Northeast monsoon plays a significant role in the regulation of ecological conditions in these water bodies. Phosphates and silicates increased in coastal waters following the opening of bar mouths during the northeast monsoon, the backwaters thus serving as a reservoir of nutrients for the coastal waters

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