Hapangama H. A. D. C. and Dayawansa, P. N. (2005) Nesting studies of the house crow (Corvus splendens) in the City of Colombo. Proceedings of the 25th Annual session of Biology, Sri Lanka. 41p.
Lelwala L. H. D. S and Dayawansa, P. N. (2005) How do weed mats impact on the foraging behaviour of wading birds in the Bundala lagoon, Sri Lanka?. Proceedings of the 26th Annual session of Biology, Sri Lanka. 49p
Jayantha D., Dayawansa P. N. , U. K. G. K. Padmalal and Ratnasooriya, W. D. (2005) Behaviour of the Juvenile Asian Elephants in the Panicum maximum dominated grasslands in the Udawalawa National Park. Proceedings of the 10th International Forestry and Environment Symposium, 33p.
Jayantha D., Jayawardena S. and Dayawansa P. N. (2004) Some Aspects of Behaviour of Juvenile Elephants at the Elephant Transit Home, Udawalawa, Sri Lanka. Elephant Symposium, Pilanesberg NP, South Africa.
Keeragala, N. D. and Dayawansa, P. N. (2002) Influence of the availability of garbage on the distribution of house crow (Corvus splendens) in the city of Colombo Annual Sessions of Institute of Biology, Sri Lanka.
Siyam, S. M., Wijesinghe, Mayuri R. and Dayawansa, P. N. (2002) Food and feeding preference of leopard (Panthera pardus kotiya) in the Sinharaja Man and Biosphere Reserve, Sri Lanka Annual Sessions of Institute of Biology, Sri Lanka.
Dayawansa, P. N., Siyam, S. M. and Wijesinghe, Mayuri R (2002) Diet and Microhabitat selection of two sympatric species of frogs in the Sinharaja Man and Biosphere Reserve, Sri Lanka. Annual ATB Conference, Tropical Forests: Past, Present, Future, The Association for Tropical Biology, Smithsonian Tropical Research Institute, Panama.
Keeragala, N. D. and Dayawansa, P. N. (2002) Abundance and distribution of house crow (Corvus splendens) in the city of Colombo Annual Sessions of Institute of Biology, Sri Lanka.
Goonatilake, M. R. M. P. N. and Dayawansa, P. N. (2002) A comparative study of the diversity and abundance of herpetofauna on tree-fall gaps and the adjacent closed canopy forest in the proposed Delwala forest reserve. Proceedings of the 22st Annual session of Biology, Sri Lanka. 41pp.
Bopitiya, D and Dayawansa, P. N. (1998) A Preliminary Study of the Impact of Domestic Cattle and Buffalo on the status of the Bundala National Park Annual Sessions of the Sri Lanka Association for Advancement of Science.
Wijesinghe, Mayuri R. and Dayawansa, P. N. (1997) Microhabitat Selection and Resource Partitioning by Waders at the Bundala National Park (1999) Annual Sessions of the Sri Lanka Association for Advancement of Science.
Lincoln, G. A., Dayawansa, N. and Ratnasooriya, W. D. (1994) Antler Cycles in Male Axis Deer, Axis axis living in Sri Lanka close to the equator. Annual Sessions of Zoological Society of Edinburgh (Poster Presentation).
Dayawansa, P. N. and Jayatunge, Y. N. A. (1992) Diversity, Distribution, Composition and Fecundity of Cladoceran Zooplankton in the Colombo (Beira) Lake (1990) Annual Sessions of the Physiological Society of Sri Lanka.