NATIONAL Secretary, Indian Academy of Sciences 1982-85 Chairman, Scientific Committee on Problems of the Environment (SCOPE) - INSA 1985- Member, Advisory Committee, Bombay Natural History Society 1983- Member, Management Committee, Vikram Sarabhai Community Science Centre 1981-84 Member, Kerala State Council for Science, Technology and Environment, 1983- Member, Governing Council, Indian Institute of Tropical Meteorology, 1987-90 Member, Research Advisory Council, National Institute of Oceanography 1983-85 Member, Executive Council, Centre for Earth Science Studies 1982-85 Member, Forward Looking Group, Ministry of Agriculture, Government of India 1987-90 Member, Technical Advisory Committee on Biological Sciences, Indian Statistical Institute 1987-90 Member, Scientific Advisory Council to the Prime Minister of India, 1986-89 Member, Sub committee for the project entitled "Regional Agricultural Planning Based on Agro-Climatic Zones" for the Southern Plateau and Hill Region, Planning Commission, Government of India. 1987-89 Member, Committee on Environment, Ecology and Forestry, Teaching and Training, University Grants Commission. 1986-88 Chairman, Study Group on Fuel and Fodder, Planning Commission, Government of India 1987-88 Member, Advisory Board of 'Peoples Association for Himalayan Area Research' Member, Panel for Technology Demonstration, Directorate of Adult Education, Department of Education, Government of India. Member, Faculty of Science, Delhi University, 1993-1996 Member, Advisory Board, Biodynamic Agro-Informatics, Nashik, 1994- Member, Governing Council, Madras Institute of Development Studies, 1997- INTERNATIONAL Member, Board of Directors, II International Congress of Systematic and Evolutionary Biology 1980. Member of Staff in Terrestrial Ecology, Ecology Institute, FRG 1984- Member of Council, Society for Conservation Biology, USA 1987 Member of Council, Association for Tropical Biology, USA 1988-90 Honorary Consultant, Species Survival Commission, IUCN 1988-1991 Chairman, Scientific and Technical Advisory Panel of Global Environment Facility, 1998-