Biological Monitoring of Some Hydrographical Features of Ashtamudi Estuary

International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue IV, April 2018 | ISSN 2321–2705

Biological Monitoring of Some Hydrographical Features of Ashtamudi Estuary

Divya. S. Rajan

Guest Lecturer, P.G Department of Zoology, Christian College, Chengannur, Kerala, India.

Abstract: Wetlands, the receptacle of a large variety of effluents are integral parts and there is a need to manage it in relation to its wise use. Hydrology is the single most important factor responsible for the formation and sustenance of the wetland. This study has been furnished to highlight the monthly variations of certain hydrographical features of the Thekkumbhagam creek of Ashtamudi estuary. Kerala, the God’s own Country blessed with green vegetation, rivers, back waters and many other natural resources has been put on a severe stress due to over exploitation and pollution. Present study investigates the variations in atmospheric temperature, water temperature, transparency with respect to seasons. From the present investigation, it is inferred that there was a gradual increase in temperature from January to May and the temperature declined during the monsoon followed by increase in the later months. Low water temperature observed in downstream in certain periods may be due to the intrusion of comparatively cooler water from the sea. The temperature values thus showed an increasing trend from downstream to up stream. The recorded higher post-monsoonal values may be due to low intensity of solar radiation and higher concentration of discharge and bottom sediment could also be the important factors in governing light penetration. Analysis implies that it is essential to adopt suitable technologies for decontaminating these waters. Lack of awareness of wetland values and importance could be one of the major reasons for not recognizing wetland as a separate “entity” and for not giving the importance it deserves.

Key words:- Secchi disc, transparency, air temperature, wetland, hydrology.


The overall study of the various hydrographical parameters would help in understanding the extent of water pollution and the potential availability of life supporting elements, since the concentration and distribution of nutrients have a dominant role in the productivity of the aquatic ecosystem.