Department of Forestry and Environmental Science
UNIVERSITY OF SRI JAYEWARDENPURA, SRI LANKA ../
FORESTRY AND ENVIRONMENT SYMPOSIUM
|DEPARTMENT HOME SITE|
|FORESTRY SYMPOSIUM 1996|
Dhammithra Samarasinghe, P Paranagama and S Veediyabandara
National Herbarium, Royal Botanic Gardens, Peradeniya
Udawalawe National Park in Sri Lanka is located within the lower catchment of Udawalawe Reservoir in the lowest peneplane. This area falls into two administrative districts. The parkland on the right bank of Walawe Ganga is within Ratnapure district and the Parkland on the left bank falls within Moneragala district. The dry land area of the park is about 308 sq km. The Uda Walawe reservoir is situated within the park premises. The total area of the park within the declared boundary including the reservoir is 32,315 ha. The annual average temperature is about 290 C with a maximum of 37.20 C and a minimum of 17.70 C. The annual average rainfall is about 750 to 1000 mm. The wind speeds are relatively low in the rainy seasons. In May, June and July the wind speeds are high.
A field survey was carried out to identify the butterfly fauna of Udawalawe National Park. Observations were taken at 10 different habitat types. Collection of field data was done for a period of 20 days during daytime. Butterflies were captured for identification using a home-made entomological net (frame 40 cm diameter, 60 cm deep, small-mesh type and 1 m handle). Recordings were obtained along 100 m transects in each habitat.
Results show the presence of 136 species of butterflies belonging to the families: Danaidae ( 6 species ), Satyridae (6 species), Nymphalidae (25 species), Amathusiidae (1 species), Lycaenidae (45 species), Pieridae (17 species), Papilionidae (6 species), Hesperiidae (31 species). 16 endemic species were recorded and 45 species were reported to be threatened, 3 species were very rare and 20 species were rare. The commonest butterflies recorded in different habitat types were; Danaus chrysippus, Ypthima ceylonica, Euploea core asela, Orstriaena medus mandata, Neptis hylas varmona, Jamides celeno tissama, Leptosia nina nina, Appiass albina darata, Eurema hecabe simulata, Papilio demoleus.
Department of Forestry and Environmental Science,