1. Dar es Salaam University College of Education (DUCE) Dar es Salaam Tanzania
2. School of Natural Sciences, Technology and Environmental Studies Södertörn University Huddinge Sweden
3. Department of Botany University of Dar es Salaam Dar es Salaam Tanzania
4. Institute of Marine Sciences University of Dar es Salaam Zanzibar Tanzania
5. Department of Ecology, Environment and Plant Sciences Stockholm University Stockholm Sweden