1. Institute of Ecology and Environmental Studies, Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria
2. Department of Geography and Planning Science, Ekiti State University, Ado Ekiti, Nigeria
3. Department of Botany, Delta State University, Abraka, Delta State, Nigeria
4. Jiann-Ping Hsu College of Public Health, Georgia Southern University, Statesboro, USA