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Author: CHANNESH G. V × End date: 2019 × Start date: 2018 × Thesis Type: M.F.Sc ×
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    ThesisItemOpen Access
    ANTHROPOGENIC INFLUENCE OF MARVOOR VENTED DAM ON HYDROBIOLOGY OF GURUPUR RIVER AND ESTUARY, MANGALORE
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR, 2018) CHANNESH G. V; GANGADHARA GOWDA)
    Anthropogenic effects and processes influences physico-chemical characteristics of aquatic environments and biodiversity. Continuous influx of raw sewages and discharge of effluents into Gurupur river water systems lead to impair the water quality and biodiversity in the Marvoor vented dam and hydrobiology Gurpur River and estuary, Mangaluru, Dakshina Kannada, Karnataka. The present investigation was carried out for twelve months in selected stations (S1 to S7) S1, S2 & S3 in the Vented dam fresh water zone and S4, S5, S6 & S7 in brackish water zone. Study revealed that the anthropogenic activities have made impacts on water quality (Temperature pH, DO, BOD and nutrients especially Ammonia –Nitrogen; sediment (Temperature, pH, Organic matter and texture); plankton (Phytoplankton and Zooplankton); benthos and fishes. Among the water quality parameters water temperature, DO, BOD, salinity, pH and nutrients showed wide range of fluctuations in the both fresh water and estuarine water zones, due to discharge of domestic raw sewage and industrial effluents and habitat destruction due to sand excavation. Presence of dominance of species phytoplankton belong to Chlorophyceae and Chrysophyceae and zooplankton dominated by copepods followed by rotifers indicated the eutrophic environment. Further, microbiological analysis showed that water is contaminated by total and faecal coliforms. Hence, the water is not safe for human consumption. Physio-chemical parameters of water and sediment have altered the occurrence, abundance and distribution of plankton, macro benthos and fish fauna. Results indicated that entry of untreated sewage and industrial wastes have to be treated and before released into the Gurupur river estuary. The water in the vented dam is unsafe hence, water should be treated before supplied to local population in the region. The Gurupur river ecosystem should be properly managed and conserved for future needs