1. Department of Sustainable Agriculture, Biodiversity and Ecosystem Management, School of Life Sciences and Bioengineering, Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania
2. School of Business Studies and Humanities, Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania
3. Physical Geography Department, Stockholm University, Stockholm, Sweden
4. Ecology of Tropical Agricultural Systems, Hohenheim University, Stuttgart, Germany