1. Postgraduate Institute of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka
2. Department of Zoology, Faculty of Natural Sciences, The Open University of Sri Lanka, Nugegoda 11222, Sri Lanka
3. Department of Botany, Faculty of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka
4. Department of Zoology, Faculty of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka