Influence of selected anthropogenic impacts on ecology of Vembanad Lak

Abhilash, K S

Jeyabaskaran, R

John, Seban

Jyotsna, J B

Kripa, V

Lavanya, S

Padua, Shelton

Prema, D

Renith, R

Shylaja, G

Vineetha Valsalan, K C

Vysakhan, P

Lavanya, R

CMFRI Digital Repository

RESEARCH POSTER PRESENTATION DESIGN © 2015www.PosterPresentations.com Action must be taken to provide  and / or improve sewage treatment at Aroor Proper collection and processing facilities for  biodegradable wastes must be provided here. Awareness campaigns on waste disposal must be conducted. In Eloor, measures should be initiated for effluent treatment plants, effluent monitoring, proper disposal of effluents  Possible bioremediation measures also must be attempted here. In Kumarakom, house boats should have appropriate means for collection,treatment and disposal of wastes generated during house boat usage / journey There should be proper mechanism for collection, treatment and disposal of domestic wastes, plastic and other wastes in this area.REFERENCESAuthors are grateful to Dr. A. Gopalakrishnan, Director, CMFRI for providing support forthe investigation. Thanks are also due to Dr. V. Kripa, Head, FEMD, CMFRI for makingavailable the Divisional Manpower and Facilities for the the study.CENTRAL MARINE FISHERIES RESEARCH INSTITUTE, KOCHI*Prema, D., Shelton Padua, Kripa, V., Jeyabaskaran, R., Abhilash, K. S., Lavanya Ratheesh, Jyosthna, J. B., Shylaja, G., Ranith , R., Vysakhan, P ., Seban John and Vineetha ValsalanINFLUENCE OF SELECTED ANTHROPOGENIC IMPACTS ON ECOLOGY OF VEMBANAD LAKEFB PO 28Key words : Vembanad Lake, Anthropogenic impacts, Water quality index, Coastal ecology, Spatial mapping, Environment management planMATERIALS AND METHODSSAMPLING LOCATIONSThe present investigation was carried out at selectedlocations of VL (Fig 1). The sites were selected basedon selected anthropogenic activities. Effluent discharges from industries : Eloor. Tourism : Kumarakom. Effluent discharge from sea food processingplants and shrimp peeling sheds : Aroor. Reference station :PanangadFig 1.  Sampling LocationsMETHODOLOGYStandard methods of sampling and analysis for water quality were adopted with precisionand accuracy during pre-monsoon period (Dec2016- April17). Water quality index (WQI)was calculated as per the USEPA (2006) method. Phytoplankton samples were collected fromsurface water using a conical net of mesh size 20 micron. Quantitative analysis ofphytoplankton samples in the laboratory was done by Sedgwick-Rafter counting chamberunder a compound microscope. The statistical analysis for diversity indices was done usingthe software PRIMER 6. The analysed data sets were plotted using GIS software ArcGIS10.0 , QGIS 2.18.14 and R 3.4.2.*premadicar@gmail.comAroor area impacted by sea food processing plants & shrimp peeling sheds and Eloor areaimpacted by industrial effluents were having water quality index, as “POOR” (Fig. 2).Kumarakom area where there are tourism activities and a control region (Panangad) were havingfair water quality. Corresponding phytoplankton and species abundance in selected locations ofVL are shown in Figs. 3, 4 and 5.. Wetlands are integral part of river basins or extension of sea and are considered as veryproductive ecosystems. The Vembanad Lake (VL) , one of the massive coastal wetlandecosystem, located in the south-west coast of India is an Ecologically sensitive zone. ThisRamsar site is an indispensable habitat for many biologically and economically importantresident and migratory aquatic fauna. Today wetlands are under serious threats due tourbanization, climate change, introduction of new species, salinization, dumping ofsewage and toxic chemicals by the industries, construction activities, various agriculturalpractices, dredging activities, retting activities and tourism etc. and the VL is noexception. Recent studies showed that the VL underwent many alterations viz. changes incommunity structure (Walmiki et al., 2016), shrinkage in area (Nair and Babu, 2016)variation in water quality (Prema et al., 2014), nutrient dynamics (Sujatha et al., 2009),nonpoint source pollution (Paul et al., 2014) and many more. The anthropogenic threatsencountered in VL were narrated by Sujatha et al., (2009). Environmental degradation inVL occurs by the irresponsible usage and also by the insensible disposal / discharge ofpollutants into the water bodies. It is essential to make an evaluation of the health status ofVL to evolve methods for its renovation, based on which, micro-level environmentalmanagement plans can be prepared to abate stress and sustain ecosystem health.INTRODUCTION To assess ecosystem health of VL, in selected locations, based on water qualityindex and phytoplankton as major indicators during pre-monsoon as impacted byselected anthropogenic activities Spatial mapping of VL based on water quality index and phytoplankton abundance Suggestion of suitable environment management plans based on the results ofassessment and mappingOBJECTIVESENVIRONMENT MANAGEMENT PLANRESULTS AND DISCUSSION  Results indicate  VL ecosystem deterioration  and ecological imbalance.Assessment of ecosystem health of V L, was done in selected locations, based on water qualityindex and phytoplankton. The water quality was indexed, using USEPA grading of selectedenvironmental indicators (Table 1).Table 1. Range of selected environmental indicators for water quality indexingRanking Grade colour DO, mg l-1 Chl a, µg l-1 DIP, mg l-1 DIN, mg l-1Good > 5 > 20 <0.01 <0.1Fair 2-5 5-20 0.01-0.05 0.1-0.5Poor < 2 <5 >0.05 >0.5Fig.  4 Fig.  2 Fig.  3 Fig.  5 Diatoms, %Dinoflagellates, %Coccolithophore, %The phytoplankton diversity index  of  the locations with  interpretation of pollution levelACKNOWLEDGEMENTNair, P.K and Babu, SDS. 2016.  Spatial Shrinkage of Vembanad Lake, South West India during 1973 -2015 using NDWI and MNDWI.  International Journal of Science and Research. 5 (7), 319-7064.Paul,K.,  Alias, BM and Varghese, S. 2014. Spatial Distribution of Non-point Source Pollution in Vembanad Lake. International Journal of Innovative Research in Science & Engineering. ISSN (Online) 2347-3207 Prema, D., Jeyabaskaran, R ., Kaladharan, P ., Khambadkar, L R., Anilkumar, PS.,  Nandakumar, A ., Valsala, KK and Kripa, V. 2014. Water quality indexing of coastal waters off Cochin. .Marine Fisheries Information Service; Technical and Extension Series (219). pp. 15-16Sujatha CH, Benny N, Raveendran R, Fanimol CL and Samantha NK.  2009.Nutrient dynamics in the two lakes of Kerala, India. Indian J Mar Sci. 38:451-456.Walmiki, N., Sharma, D and Kubal, P. 2016. Aquatic Diversity with Reference to Phytoplankt Benthos in Lake Vembanad, Kottayam, Kerala, India. Research Journal of Marine Sciences. 4 (3): 1-10. E-ISSN 2321–1296 Needs immediate  intervention to stop further damage

Influence of selected anthropogenic impacts on ecology of Vembanad Lake

http://eprints.cmfri.org.in/12877/1/Prema%20D_2017_Influence%20of%20selected%20anthropogenic%20impacts%20on%20ecology%20of%20Vembanad%20Lake_Poster.pdf

Influence of selected anthropogenic impacts on ecology of Vembanad Lake

Abstract

Similar works

Full text

Available Versions

CMFRI Digital Repository