1Department of Life and Earth Sciences, University of Maroua, Ecole Normale Superieure, BP. 46 Maroua, Cameroon.
2Department of Biological Sciences, Faculty of Science, University of Ngaoundere,
BP. 454 Ngaoundere, Cameroon.
3Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P. O Box 842, Yaounde, Cameroon.
Email: [email protected]