1. Niger Delta Ecology and Biodiversity Conservation Unit, Department of Applied and Environmental Biology, Rivers State University of Science & Technology, P.M.B. 5080, Port Harcourt, Nigeria;,
2. Department of Forestry and Wildlife, University of Uyo, P.M.B. 1017, Uyo, Akwa-Ibom State, Nigeria;
3. Centre of Environmental Studies DEMETRA, via Olona 7, 00198 Rome, Italy;
4. Ecologia Applicata Italia, via Edoardo Jenner 70, 00151 Rome, Italy;