29 Aug J.M. Chandramali Jayawardana
J.M. Chandramali Jayawardana, Sri Lanka.
Dr J.M.C.K Jayawardana is a senior lecturer attached to the Department of Natural Resources, Faculty of Applied Sciences, Sabaragamuwa University of Sri Lanka. She completed her Bachelor’s degree at the University of Sri Jayawardanapura, Sri Lanka specialized in the field of Zoology. She obtained her MPhil degree from the University of Peradeniya, Sri Lanka in the area of Aquatic Resource Management and subsequently she obtained her PhD in Environmental Management from the University of Ballarat, Victoria, Australia in 2007. Her major area of specialization is Aquatic ecology and she is currently involved in many research projects related to areas of catchment management, stream health assessment and aquatic environment management. She has published her work in several international as well as nationally reputed journals and presented in many international and national conferences.
Presentation Title:Effect of catchment disturbance on river health in two agricultural catchment in Sri Lanka.
Catchment land use practices have a profound impact on river health and therefore have been given important consideration in river catchment management efforts in many parts of the world. However, lack of empirical evidence of such impacts on rivers in many regions of the world has been a limiting factor for effective catchment management efforts. There is a wide range of river health assessment tools such as physical habitat quality, chemical water quality and bio indicators for assessing landscape impacts. However the use of such holistic approaches to river health assessment is limited in many tropical regions of the world and mostly they are restricted to water quality monitoring programs. The present study aimed to evaluate river health using multiple tools in response to catchment impacts in two agricultural catchments, Uma oya and Badulu oya in Mahaweli watershed in Sri Lanka. The spatial and temporal variation of water quality, stream physical habitat quality and macroinvertebrate bio indicators in both catchments were assessed in relation to catchment disturbances. Physico-chemical water quality parameters and macroinvertebrate indices were evaluated in twenty sampling sites in both catchments within one year period. Results revealed that several chemical water quality variables such as Electrical conductivity (EC), Total solids (TS), Total Dissolved Solids (TDS), Alkalinity, Nitrate –N (NO3-N) and physical variables such as stream Channel Quality Index (CQI) and Riparian Quality Index (RQI) were significantly influenced by the degree of catchment disturbances. Among the macroinvertebrate indices tested, total abundance and family richness and community composition were significantly varied with the degree of catchment disturbances. The findings of the present study revealed that the land use practices of both catchments are having a significant impact on stream ecological health and the prospects of using diverse attributes in river health monitoring programs in Sri Lanka.