Dr. D.D.G.L. Dahanayaka

Senior Lecturer (G II)


Zoology
Faculty of Natural Sciences
Contact:

Select, Room 140, 1st Floor, Science & Technology Building

Office: , Ext: 446 Mobile: +9471-3629605

E-mail: dddah@ou.ac.lk ddgldahanayaka@gmail.com

Dr. Dahanayaka holds B.Sc and M.Phil degrees from the University of Kelaniya, Sri Lanka and PhD and Post-doctoral degrees from the Ibaraki University, Japan. He worked as a Scientist of Remote Sensing on Coastal and Inland Water Environment monitoring at National Aquatic Resources Research and Development Agency (NARA), Sri Lanka for over 12 years and currently holds the position of Senior Lecturer at Department of Zoology, The Open University of Sri Lanka. Dr. Dahanayaka has published over 100 articles/reports on Environmental Sciences, which include 22 in peer-reviewed international journals. He has delivered 15 invited presentations (in USA, Japan, Vietnam, Indonesia, Pakistan, Cambodia and Sri Lanka). Over the last decade has established highly productive research collaborations with reputed scientists from Japan, Sri Lanka, USA, Vietnam, Cambodia and Indonesia. He is fully conversant in planning and implementing of research programs, designing experiments, statistical analysis and writing research information for publication. Possess administrative skills, management skills, teaching skills and experience in advisory capacity while serving in several advisory committees of environmental science, fisheries and aquaculture sectors. Experienced in securing and handling collaborative projects with local and international counterparts and conducting workshops, seminars, and lectures.

Areas of Specialization:

GIS and Remote Sensing, Wetland Ecology, Aquatic Invertebrates, Invasive Alien Species

Research interests:

Climate Change impacts on Coastal Ecosystems, Community Based Fisheries

Affiliations:

NULL

Course Coordination:

GIS and Remote Sensing in Natural Resources Management – FNU6300, Fundamentals of Environmental Impact Assessment (EIA) – FNU6302, Oceanography and Ocean Resources – ZYU6309, Animal Behavior – ZYU4303

Researches:

Peer Reviewed Papers

  1. D.D.G.L. Dahanayaka, Spatial data analysis for the marine fisheries and habitat management of Sri Lanka, Sri Lanka Journal of Aquatic Sciences, Vol. 23 (1), pp. 37-47 (2018).
  2. D. Rapoport, B.V. Bartak, A. Ali, C. Suraweera and D.D.G.L. Dahanayaka (2018), Implementation of MFD algorithm in ArcGIS, WILDLANKA. 6(1): pp. 024-031.
  3. P. Wang, Y. Ishikawa, D.D.G.L. Dahanayaka and A. Minato, Portable Water Color Monitoring System Using Microcontroller for Phytoplankton Bloom Measurement in Japanese Lake, International Journal of Modern Engineering Research (IJMER). 8(7): pp. 50-59.
  4. N. Perera, D.D.G.L. Dahanayaka and S. Udagedara (2017). Habitat preference and population structure of two data deficient seahorse (Syngnathidae) species, OUSL Journal, The Open University of Sri Lanka, Vol. 12, No 2, pp. 75-97.
  5. S. Ozawa, D.D.G.L. Dahanayaka, N. Warnajith, S.B. Quarmal (2017). Renovation of Research and Education in South Asian Countries by Means of ICT, OUSL Journal, The Open University of Sri Lanka, Vol. 12, No 2, pp. 19-41.
  6. D.D.G.L. Dahanayaka (2017). Applications of satellite remote sensing for conservation and management of wetland ecosystems of Sri Lanka. In: Gloria Scientiam. M.J.S. Wijeyaratne and W.U. Chandrasekara eds. University of Kelaniya, Sri Lanka. pp. 255-263.
  7. P.A.C.N.B. Suraweera and D.D.G.L. Dahanayaka (2017), Assessment, monitoring and management of Invasive Alien Species at Bundala National Park (A Ramsar Wetland) in Sri Lanka, Wetlands Sri Lanka, Central Environmental Authority, Sri Lanka, Vol. 3, PP. 80-85.
  8. D.D.G.L. Dahanayaka, B.D.C. Perera, M.J.S. Wijeyaratne and H. Tonooka, Monitoring eutrophication trends in Bolgoda North Lake, Sri Lanka by Satellite Remote Sensing, Turkish Journal of Fisheries and Aquatic Sciences, vol. 16, pp. 563-570 (2016) DOI: 10.4194/1303-2712-v16_3_08.
  9. D.D.G.L. Dahanayaka, H.D. Wimalesena, V. Pahalawattarachchi, Potential of the Conservation Oriented Mangrove Based Ecotourism; A Case Study of Kadolkele Mangrove Reserve, Negombo, Sri Lanka, Journal of National Aquatic Resources Research and Development Agency, Vol. 44, pp. 31-44,(2015).
  10. D.D.G.L. Dahanayaka, S.B. Quarmal, K.N.S. Warnajith, G. Dassanayake, H. Tonooka, A. Minato and S. Ozawa, Expansion of the Remote Sensing Research on water environments of Asia through KISSEL Server System, ICT for Development Working Paper Series, Vol. 05, No. 1, pp. 54-63 (2015).
  11. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Comparison of Three Chlorophyll-A Estimation Approaches Using Aster Data Acquired Over Sri Lankan Coastal Water Bodies, Malaysian Journal of Remote Sensing & GIS, vol. 4, No. 1 pp. 21-29 (2015).
  12. S.H.P.K.Lakesh, D.D.G.L. Dahanayaka, G. Anne Nisha, N. Warnajith, H. Tonooka, A. Minato and S. Ozawa, Development of inexpensive multi-parameter sensors based network system for water environment monitoring, International Journal of Environmental Sciences, vol. 5, No.2, pp. 341-352 (2014) DOI :10.6088/ijes.2014050100030.
  13. S.H.P.K.Lakesh, D.D.G.L. Dahanayaka, H. Tonooka, A. Minato and S. Ozawa, Spectral Signatures Identifying Instrument on Spectroscopic Measurement Technique for Water Quality Monitoring, Advanced Materials Research, Trans Tech Publications, Switzerland, Vols. 838-841, pp. 2014-2018 (2014).
  14. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Two decadal trends of surface chlorophyll-a concentrations in tropical lagoon environments in Sri Lanka using satellite and in-situ data, Asian Journal of Geoinformatics, Vol. 13, No. 3, pp. 15-25 (2013).
  15. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa  Monitoring Land Use Changes and their Impacts on the Productivity of Negombo Estuary, Sri Lanka Using Time Series Satellite Data, Asian Fisheries Science, Vol. 25, pp. 97-112, (2012).
  16. D.D.G.L. Dahanayaka, Circumstances of Remote Sensing Applications and Educations in Sri Lanka, Journal of the Remote Sensing Society of Japan, Vol. 32, No. 3, pp. 160-163, 2012.
  17. H.B. Jayasiri and D.D.G.L. Dahanayaka, Saltwater Intrusion and Its Impact on Koggala Lagoon and Associated Waters, Southern Coast of Sri Lanka, Asian Journal of Water, Environment and Pollution, Vol. 9, No. 2, pp. 73-84, (2012).
  18. V. Patu, E. T Ualesi, A Ualesi, K N S Warnajith, D.D.G .L. Dahanayaka, A Minato, H. Noguchi and S. Ozawa, How to give support to E-Learning System for students by the application of portable machines as mobile terminals, Journal of Interactive Learning Research (JILR), Association for the Advancement of Computing in Education, Vol. 23, pp. 112–138 (2011).
  19. V. Patu, H. Salanoa, E. T Ualesi, A Ualesi, K N S Warnajith, D.D.G.L. Dahanayaka, A Minato, H. Noguchi and S. Ozawa, Teachers experience as e-learning students based on a case study conducted within the National University of Samoa, Journal of Pacific Studies (JPacS), Vol. 30, pp. 75–89, (2011).
  20. D.D.G.L. Dahanayaka and P. Sivarajah, Is Sri Lanka’s marine products exports competitive? Analysis of fisheries exports of Sri Lanka. AGRIEAST: Journal of Agricultural Sciences. Vol. 9, pp.36–41, (2010). DOI: http://doi.org/10.4038/agrieast.v9i0.19
  21. D.D.G.L. Dahanayaka, Benthic macrobenthos of the estuaries and lagoons in Sri Lanka, Seshaiyana, Annamalai University, India, Vol. 16, No. 3, pp. 4-7, (2009).
  22. S.C. Jayamanne and D.D.G.L. Dahanayaka, Post tsunami recovery of fauna and flora of the Barberyn reef, Beruwala, Sri Lanka, Journal of National Aquatic Resources Research & Development Agency, Vol. 39, pp. 49-58, (2009).
  23. D.D.G.L. Dahanayaka, W.A. Sumanadasa, Seed Propagation of mangrove plants and maintenance of nurseries, “Ruk”, Forest Department, Vol.21, 6, 12-13pp, (2009).
  24. D.D.G.L. Dahanayaka, Sri Lankan Oil Spill: Immediate assessment of oil spill incident in Koggala, Sri Lanka with an emphasis on impact of coastal ecosystems, AMETEC Newsletter, Vol. 2, No. 1, pp. 8-9, (2008).
  25. D.D.G.L. Dahanayaka, S.C. Jayamanne and S.U.P. Jinadasa, Preliminary investigations on the abundance, distribution and diversity of benthic invertebrates and sediment texture in marine environment of Palk Strait, off Jaffna, Sri Lanka. Journal of National Aquatic Resources Research and Development Agency, Vol. 38, pp. 33-44, (2007).
  26. D.D.G.L. Dahanayaka and M.J.S. Wijeyaratne, Diversity of macrobenthic community in the Negombo estuary, Sri Lanka with special reference to environmental conditions, Sri Lanka Journal of Aquatic Sciences, Vol. 11, pp. 43-61, (2006). DOI: 10.4038/sljas.v11i0.2222
  27. D.D.G.L. Dahanayaka and W.A. Sumanadasa, Mangroves in Kadolkale, Negambo estuary, Sri Lanka. Sri Lanka Naturalist journal of ecology and nature, Vol. 7, No 03-04, pp. 4-8, (2005).
  28. D.S. Jayakody and D.D.G.L. Dahanayaka, Diversity of Fishing Practices and Resources Conservation in Negombo Lagoon, Sri Lanka Naturalist, Vol. 6, No. 01-02, pp. 29-31, (2005).
  29. D.D.G.L. Dahanayaka, Some notes on macrobenthos in estuaries with an emphasis on macrobenthic community structure of Negombo estuary, Sri Lanka Naturalist, Vol. 6, No. 3-4, pp. 26-31, (2004).

Conference Proceedings

  1. V. Pahalawattaarachchi and D.D.G.L. Dahanayaka (2018), Abundance, Distribution and Diversity of Seagrass species in Gulf of Mannar, Palk Bay and Palk Strait, Sri Lanka, Proceedings of the annual session of Department of Wildlife Conservation??�7th -9th Aug 2018, Colombo.
  2. D. Rapoport, B.V. Bartak, C. Suraweera and D.D.G.L. Dahanayaka (2018), Multiple flow direction algorithm in quantifying catchment area-forest relationship of Kelani River in Sri Lanka, Proceedings of the annual session of Department of Wildlife Conservation, 7th -9th Aug 2018, Colombo.
  3. V. Pahalawattaarachchi, D.D.G.L. Dahanayaka, P.A.D.A. Kumara and R. Weerasingha (2018), Variation in growth rates and Carrageenan properties of Kappaphycus alvarezii at commercial culture site in Killinochchi district, SLCARP International Agricultural Research Symposium 2018, Sri Lanka Council for Agricultural Research Policy, 13-14 Aug 2018, Colombo, Sri Lanka, p. 116.
  4. M. L. D. Lekamge, D.D.G.L. Dahanayaka and M.J.S. Wijeyaratne, Assessment of the invasion of water hyacinth (Eichhornia crassipes) using GIS and RS approach in Anawilundawa sanctuary, a Ramsar wetland in the western dry zone of Sri Lanka, 24th Annual Scientific Sessions, Sri Lanka Association for Fisheries and Aquatic Resources, Kelaniya, Sri Lanka, pp. 29-30, Jun. 2018.
  5. S. Udagedara and D.D.G.L Dahanayaka, The species composition and distribution of Seagrass in the Valaichchenai Lagoon, Sri Lanka, International Seagrass Biology Workshop 13 (ISBW), National University of Singapore, pp. 129, Jun. 2018.
  6. D.D.G.L. Dahanayaka (2017) Remote Sensing as an efficient tool for development of Fisheries and Aquaculture Sector, Proceedings of International Conference of the Aerospace Science & Engineering (ICASE 2017), pp. 39-40.
  7. D.D.G.L. Dahanayaka, K.N.S. Warnajith, M. Itaba, A. Minato and S. Ozawa (2017), An example of usage of KISSEL for educational platform in Sri Lanka, Science and Technology for Sustainable Development in the Pacific Conference, Apia, Samoa
  8. D.D.G.L. Dahanayaka, V. Pahalawattaarachchi (2017) Remote-Sensed mapping of seagrass distribution in Palk Bay, Sri Lanka, using high spatial resolution WorldView-2 satellite data, Asian Conference on Remote Sensing – 2017, October 23-27, 2017, New Delhi, India, 557 p.
  9. A.A.D. Amarathunga, D.D.G.L. Dahanayaka, S.A.M. Azmy, V. Pahalawattaarachchi and N.D. Hettige, Assessment of the Environmental Damage Caused Due to Oil Spill Incident at Lunawa lagoon, Theldiyawatta, Muthurajawela, Proceedings of the Third National Symposium on Marine Environment, 7th Oct 2017, pp.17. 2017.
  10. M.Gammanpila, D.D.G.L.Dahanayaka, V.Pahalawattaarachchi and H.M.P.Kithsiri, Variations in water quality conditions and functional habitats in Negombo lagoon with special reference to seabass cage culture practice, The 4th International Conference on Fisheries and Aquaculture – 2017,  At Colombo, Sri Lanka pp. 4, Aug. 2017.
  11. S. Udagedara and D.D.G.L Dahanayaka, Seagrass of Sri Lanka: Research Priorities and Conservation Challenges, Proceedings of Wild Lanka International Symposium-2017, Department of Wildlife Conservation of Sri Lanka, At Colombo, Sri Lanka pp. 49, Aug. 2017.
  12. U.S.C. Udagedara, D.D.G.L Dahanayaka and P.B.T.P. Kumara, Current Status of the Seagrass of Sri Lanka and their Research Needs Related to Climate Change, International Conference on Climate Change 2017, Colombo, Sri Lanka, pp. 46, Feb. 2017.
  13. P.A.C.N.B. Suraweera, B.H.G.K. Kumari and D.D.G.L. Dahanayaka, Assessment of invasive alien species at Bundala Ramsar wetland, Sri Lanka for their control and management, Proceedings of the National Symposium on Invasive Alien Species 2017, Waters Edge, Battaramulla, Sri Lanka, pp. 14, Jan. 2017.
  14. H.B. Jayasiri, D.D.G.L. Dahanayaka and K. Arulananthan, Diversity and abundance of marine plankton and benthos of Maruthankerny, off Jaffna, Sri Lanka, Proceedings of the  International Forestry and Environment Symposium 2016, Department of Forestry and Environment Science, University of Sri Jayewardenepura, Sri Lanka, pp. 16,Sep. 2016.
  15. H.D. Wimalasena, D.D.G.L. Dahanayaka, K.H.M.L. Amaralal, ICT applications for strengthening of fisheries information system: A Sri Lankan experience, Proceedings of the International Symposium on ICT for Sustainable Development 2016 (ICTSD 2016), University of Kelaniya, Sri Lanka, pp. 11, 10-12 August 2016.
  16. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Remote Sensing Techniques for Environment Conservation of water Bodies in Japan and Sri Lanka, The International Symposium on ICT in Development 2015 (ISICTD2015), National University of Samoa, November 25-27, 2015.
  17. T.M.S.D.G. Silva, D.D.G.L. Dahanayaka and M.J.S. Wijeyaratne, Assessment of invasion of Najas marina, Linnaeus 1753 in Madu Ganga Estuary, Sri Lanka using ASTER data of Terra satellite, Proceedings of the 35th Annual Sessions of the Institute of Biology, pp 32, September 25, 2015.
  18. S.H.P.K. Lakesh, D.D.G.L. Dahanayaka, Jiazhenzhen, A. Minato, Turbidity monitoring of water bodies using color measurement system, The 10th International Student Conference at Ibaraki University, Ibaraki, Japan, November 15-16, D02,  2014.
  19. D.D.G.L. Dahanayaka, M.J.S. Wijeyaratne, H. Tonooka, A. Minato, S. Ozawa,  B. D. C. Perera, Monitoring and predicting eutrophication of Sri Lankan inland waters using ASTER satellite data, Proc. SPIE 9240, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2014, 92400I, Amsterdam, Netherlands, 22 – 25 September 2014; doi:10.1117/12.2067127
  20. D.D.G.L. Dahanayaka, H. Tonooka, A. Minato and S. Ozawa, Assessing the potential of satellite and ground spectral data for Chlorophyll-a monitoring in Lake Kasumigaura, Japan, International Geoscience and Remote Sensing Symposium (IGRASS 2014), Québec, Canada, pp 3350-3353, 13-18 July 2014.
  21. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Use of KISSEL server as a platform for the expansion of research on the water quality of Asian water bodies, Proceedings of the International Symposium on ICT for Environmental Sustainability (ICTES 2014), University of Kelaniya, Sri Lanka, pp. 70-71, 23-25 June 2014.
  22. B.D.C. Perera, M.J.S. Wijeyaratne, D.D.G.L. Dahanayaka, H. Tonooka, A. Minato and S. Ozawa, Study of eutrophication trends in Bolgoda north lake, Sri Lanka using satellite and in-situ data, Proceedings of the International Symposium on ICT for Environmental Sustainability (ICTES 2014), University of Kelaniya, Sri Lanka, pp. 23, 23-25 June 2014.
  23. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Remote Sensing for Water quality surveillance in inland waters: the case study of Lake Kasumigaura, Japan, Proceedings of International Congress on Natural Science & Engineering (NSE), Kyoto, Japan, pp. 889-893, 7-9 May 2014.
  24. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Feasibility Study for the Estimation of the Chlrophyll-a Using ASTER Data in an Eutrophic Lake, Sri Lanka, Proceedings of Japan Geoscience Union Meeting 2014 at Pacifico Yokohama, Kanagawa, Japan, 28 April – 02 May 2014.
  25. D.D.G.L. Dahanayaka, H. Tonooka, A. Minato and S. Ozawa, Monitoring mangrove distribution and changes in Mekong Delta, Vietnam using Remote Sensing Approach, International Geoscience and Remote Sensing Symposium (IGRASS 2013), Melbourne, Australia, pp. 1583-1586, 21-26 July 2013.
  26. D.D.G.L. Dahanayaka, H. Tonooka, A. Minato and S. Ozawa, Chlorophyll monitoring of selected Asian water bodies using modified band-ratio approaches with satellite data, Proceedings of the International Symposium on Remote Sensing 2013 (ISRS 2013), Chiba, Japan, pp. 881-884, May 2013.
  27. U.S.C. Udagedara and D.D.G.L. Dahanayaka, Preliminary study on avifaunal diversity at NARA mangrove reserve, Kadolkele, Negombo, 19th Annual Scientific Sessions, Sri Lanka Association for Fisheries and Aquatic Resources, NARA, Colombo, Sri Lanka, pp. 7, May 2013.
  28. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Retrieval of Chlorophyll- a using satellite and ground spectral data in Japanese and Sri Lankan water bodies, Asia Pacific Remote Sensing Conference (SPIE 2012), Kyoto, Japan, Nov 2012.
  29. Wang Liang ,S.H.P.K.Lakesh, D.D.G.L. Dahanayaka, Atsushi Minato, Satoru Ozawa, Portable spectroscopic measurement system for water monitoring, The 8th International Student Conference at Ibaraki University, Ibaraki, Japan, Nov. 2012.
  30. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Use of Satellite imagery for water quality monitoring in coastal waters of Sri Lanka and inland waters of Japan, Marine Fish 2012, Negombo, Sri Lanka, Aug 2012.
  31. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Chlorophyll-a Monitoring in Sri Lankan Estuaries Using ALOS/ AVNIR-2 Data, International Geoscience and Remote Sensing Symposium (IGRASS 2012), Munich, Germany, P. 493, July 2012.
  32. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Development of Coastal Water Body Database on KISSEL Server, 11th International conference on InformationTechnology Based Higher Education and Training (ITHET 2012), Istanbul, Turkey, pp.3-4, Jun 2012.
  33. G. Dassanayake, N. Warnajith, D.D.G.L. Dahanayaka, H. Tonooka, A. Minato, S. Ozawa and M..P. M. Perera, The Planning, Implementation and Economics of the Knowledge Integration Server System for E-Learning (KISSEL), 11th International conference on Information Technology Based Higher Education and Training (ITHET 2012), Istanbul, Turkey, pp.9-10, Jun 2012.
  34. N. Warnajith, G. Dassanayake, D.D.G.L. Dahanayaka, H. Tonooka, A. Minato, S. Ozawa and M..P. M. Perera, Prototype of E-Learning Management System for Secondary School in Sri Lanka, 11th International conference on Information Technology Based Higher Education and Training (ITHET 2012), Istanbul, Turkey, pp. 10, Jun 2012.
  35. D.D.G.L. Dahanayaka, , H. Tonooka, M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Coastal water body database to monitor in the water quality and land use changes from Remote Sensing data, Proc. of the 52nd Conference of the Remote Sensing Society of Japan (RSSJ), Tokyo, pp. 273-274, May 2012.
  36. D.D.G.L. Dahanayaka, H. Tonooka, M.J.S. Wijeyaratne, K.N.S. Warnajith, G. Dassanayake, A. Minato and S. Ozawa, Remote Sensing as a Tool for Sustainable Management of Estuaries and Lagoons of Sri Lanka, International Seminar on Sustainability Science and ICT (ISSSICT 2012), Ibaraki University, Japan, March, 2012.
  37. D.D.G.L. Dahanayaka, H. Tonooka,  M.J.S. Wijeyaratne, A. Minato and S. Ozawa , Change Detection in the Channel Segment of Negombo Estuary, Sri Lanka using Time Series Satellite Data and its Possible Impacts on Estuarine Productivity, The 9th Asian Fisheries and Aquaculture Forum, Shanghai Ocean University, China, pp. 156-157, April, 2011.
  38. D.D.G.L. Dahanayaka, H. Tonooka,  M.J.S. Wijeyaratne, A. Minato and S. Ozawa (2011) Integration of Multisource data for Chlorophyll-a  Monitoring in Negombo estuary, Sri Lanka, International Geoscience and Remote Sensing Symposium (IGRASS 2011), Vancouver, Canada, pp. 2149-2152, July 2011.
  39. D.D.G.L. Dahanayaka, H. Tonooka,  M.J.S. Wijeyaratne, A. Minato and S. Ozawa, Evaluation of Chlorophyll retrieval algorithm using an intermittently closed tidal estuary: The Chilaw lagoon in the west coast of Sri Lanka, Proceedings of the 51st  Conference of the Remote Sensing Society of Japan (RSSJ), Aomori, Japan, pp. 55-56, Nov. 2011.
  40. D.D.G.L. Dahanayaka, H. Tonooka,  M.J.S. Wijeyaratne, K.N.S. Warnajith, A. Minato and S. Ozawa Water quality monitoring in tropical estuarine waters using Satellite Remote Sensing data – case studies from Sri Lanka, The 7th International Student Conference at Ibaraki University, Ibaraki, Japan, O-206, Dec. 2011.
  41. S.H.P.K.Lakesh, D.D.G.L. Dahanayaka, A. Minato, H. Tonooka, M. Itaba and S. Ozawa, Development of portable Spectrometer for Environment monitoring, The 7th International Student Conference at Ibaraki University, Ibaraki, Japan, O-111, Dec. 2011.
  42. N. Warnajith, G. Dassanayaka, D.D.G.L. Dahanayaka, S.B. Quarmal, V. Patu, A. Minato and S. Ozawa, Effective Data Synchronization Process Based on KISSEL, The 7th International Student Conference at Ibaraki University, Ibaraki, Japan, P-049, Dec. 2011.
  43. D.D.G.L. Dahanayaka, H. Tonooka, A. Minato, G. Dassanayake, M.J.S. Wijeyaratne and S. Ozawa, Preliminary estimation of chlorophyll concentration in a tropical coastal lagoon in Sri Lanka using satellite data and in-situ measurements, Proceedings of the 49th Conference of the Remote Sensing Society of Japan (RSSJ), Kagoshima, Japan, pp. 17-18, Nov. 2010.
  44. D.D.G.L. Dahanayaka, M.J.S. Wijeyaratne, G. Dassanayake, K.N.S. Warnajith, H. Tonooka, A. Minato and S. Ozawa, Spatial Distribution of Sea grass species and associated fauna in the Lagoon Environment: Case study in Puttalam Lagoon, Sri Lanka, Proceedings of the 6th International Student Conference at Ibaraki University, Japan, pp.168-169, Nov. 2010.
  45. K.N.S. Warnajith, G. Dassanayake, D.D.G.L.Dahanayaka, A. Minato and S. Ozawa, Development of Data Managing System in Common with Moodle and Xoops, Proceedings of the 6th International Student Conference at Ibaraki University, Japan, pp. 57-58, Nov. 2010.
  46. M. Gammanpila, D.D.G.L. Dahanayaka and H.B. Jayasiri, Effects of some anthropogenic activities on limnological characteristics, seasonal abundance and distribution of zooplankton of Negombo lagoon in Sri Lanka, International conference on knowledge Management for Sustainable development, Kathmandu, Nepal, pp. 51, Dec. 2009.
  47. D.D.G.L. Dahanayaka, M.J.S. Wijeyaratne and S.C. Jayamanne, Macrobenthic Community Structure in Relation to Land Based Pollution – Case Study in a Tropical Estuary in the West Coast of Sri Lanka, Proceedings of the 5th International Student Conference at Ibaraki University, Japan, pp. 117-118, Nov. 2009.
  48. H.B. Jayasiri and D.D.G.L. Dahanayaka, Use of Chlorophyll- a to determine the trophic status of coastal lagoons in Sri Lanka, Water Resources Research in Sri Lanka, Symposium Proceedings of The Water Professionals’ Day, Geo-Informatics Society of Sri Lanka (GISSL), Kandy, Sri Lanka, pp. 45-52, Oct. 2009.
  49. D.D.G.L. Dahanayaka, A preliminary study on the distribution of sea grass communities and associated faunal diversity in the Puttalam lagoon, Sri Lanka, First National Symposium on Natural Resource Management, Department of Natural Resources, Sabaragamuwa University of Sri Lanka, pp. 47, Aug. 2009.
  50. D.D.G.L. Dahanayaka, S.C. Jayamanne and M.J.S. Wijeyaratne, Benthic Invertebrates of a Tropical Estuary in the Western Coast of Sri Lanka, Proceedings of International Conference on Environmental Research & Technology, Parkroyal Penang, Malaysia, pp. 476-481, May 2008.
  51. M. Gammanpila, and D.D.G.L. Dahanayaka, A study on finfish and shellfish species in the NARA mangrove reserve, Kadolkele, Negombo, Sri Lanka, Proceedings of the 64th Annual Sessions, Sri Lanka Association for the Advancement of Science, pp. 73, Dec. 2008.
  52. D.D.G.L. Dahanayaka and W.A. Sumanadasa, Floral composition and vegetation structure of NARA mangrove reserve, Kadolkele, Sri Lanka and guidelines for conservation, Proceedings of the 12th International Forestry and Environment Symposium, Department of Forestry and Environment Science, University of Sri Jayewardenepura, Sri Lanka, pp. 25-26, Nov. 2007.
  53. D.D.G.L. Dahanayaka, S.C. Jayamanne and M.J.S. Wijeyaratne, Polychaete Diversity in a Tropical Estuarine Ecosystem, 13th Annual Scientific Sessions, Sri Lanka Association for Fisheries and Aquatic Resources, pp. 8, Jun. 2007.
  54. S.C. Jayamanne and D.D.G.L. Dahanayaka, Post tsunami recovery of fauna and flora of the Barberyn reef, Beruwala, Sri Lanka, Proc. of the 25th Anniversary Scientific Conference of NARA on Tropical Aquatic Research towards Sustainable Development, Colombo, Sri Lanka, pp. 34, Feb. 2007.
  55. D.D.G.L. Dahanayaka, S.C. Jayamanne and M.J.S. Wijeyaratne, Assemblages of macro-invertebrates in the Negombo estuarine ecosystem in relation to the locations of drainage outlets, Proc. of Annual Research Symposium 2006, Faculty of Graduate Studies, University of Kelaniya, Sri Lanka, pp. 82, Dec. 2006.
  56. Y.Y.K. De Silva and D.D.G.L. Dahanayaka, Performance and competitiveness – Fisheries export trade in Sri Lanka, 12th Annual Scientific Sessions, Sri Lanka Association for Fisheries and Aquatic Resources, pp. 38, Jul. 2006.
  57. D.D.G.L. Dahanayaka and S.C. Jayamanne, Macrozoobenthic community structure in the channel segment, Negombo estuary, Western coast of Sri Lanka, International Conference on Humid Tropical Ecosystems: Changes, Challenges Opportunities, Kandy, Sri Lanka, pp. 22, Dec. 2006.
  58. D.S. Jayakody, U. Liyanage and D.D.G.L. Dahanayaka, Growth observations through restocking of Penaeus monodon (Crustacea: Penaeidae) in Rekawa Lagoon, 12th Annual Scientific Sessions, Sri Lanka Association for Fisheries and Aquatic Resources, pp. 26, Jul. 2006.
  59. D.D.G.L. Dahanayaka and M.J.S. Wijeyaratne, Spatial Variation in the Diversity of Macrobenthos in the Negombo Estuary, 10th Annual Scientific Sessions, Sri Lanka Association for Fisheries and Aquatic Resources, Colombo, Sri Lanka, pp. 17, Jul. 2004.
Ongoing Research:
  1. Seagrass-Dugong conservation across the Indian and Pacific Ocean Basins: NARA Component on “Ensuring seagrass ecosystem values are incorporated into coastal area planning in Sri Lanka”, executed by The Mohamed bin Zayed Species Conservation Fund, with financing from the GEF (2015-2018)
  2. A comprehensive assessment of the tilapias and indigenous fish species diversity and their food niche segregation in reservoirs and riverine habitats of Kala Oya river basin, Sri Lanka, Faculty Research Grants -2017, Faculty of Natural Sciences, The Open University of Sri Lanka (2017)
Publications:

Books

D.D.G.L. Dahanayaka, H. Tonooka and S. Ozawa, Satellite Remote Sensing for Environmental Assessment of Water Bodies, LAP Lambert Academic Publishing, 184p. 2013.  ISBN 978-3-659-42676-6

Technical Reports

  1. Three Dimensional Seismic Survey for Oil Exploration in Block SL-2007-01-001 in Gulf ofMannar-Sri Lanka, INITIAL ENVIRONMENTAL EXAMINATION REPORT, CAIRN LANKA PVT. LIMITED October 2009
  2. Report on Initial Assessment of environmental damage due to Oil spill incident off Koggala, National Aquatic Resources Research & Development Agency Sri Lanka on 8th September 2006.
  3. Report on Fish kill incidence in Negombo lagoon, National Aquatic Resources Research & Development Agency Sri Lanka 2006.
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