1. Niger Delta Ecology and Biodiversity Conservation Unit; Department of Applied and Environmental Biology; Rivers State University of Science and Technology; Port Harcourt (Rivers State) P.M.B.5080 Nigeria
2. Associazione Centro ELIS; via Sandro Sandri 79 Rome 00182 Italy
3. Centre of Environmental Studies Demetra; via Olona 7 Rome 00198 Italy