1. International Institute of Tropical Agriculture (IITA)-Cameroon , PO Box 2008, Messa, Yaoundé , Cameroon
2. National University of Equatorial Guinea , Avenida Hassan II, Malabo, Bioko Norte Province , Equatorial Guinea
3. Faculty of Science, University of Maroua , Maroua , Cameroon
4. Department of Biology, Drexel University , 3141 Chestnut Street, Philadelphia, PA , USA
5. Bioko Biodiversity Protection Program , Malabo , Equatorial Guinea
6. Institute of Agricultural Research for Development BP 2123 , Messa, Yaoundé , Cameroon
7. Center for Tropical Research, Institute of the Environment and Sustainability, University of California , Los Angeles, CA , USA