1. Research Unit of Biology and Applied Ecology, Department of Animal Biology, Faculty of Science University of Dschang Dschang Cameroon
2. Department of Forestry, Faculty of Agronomy and Agricultural Sciences University of Dschang Dschang Cameroon
3. Department of Mining and Mineral Engineering, National Higher Polytechnic Institute University of Bamenda Bamenda Cameroon
4. Research Unit of Soil Analysis and Environmental Chemistry, Department of Soil Sciences, Faculty of Agronomy and Agricultural Sciences University of Dschang Dschang Cameroon