International Journal of Biodiversity and Conservation 2141-243X Academic Journals 10.5897/IJBC12.115 Seburanga J. L. Kaplin B. A. Bizuru E. Mwavu E. N. * E-mail: seburanga@yahoo.fr 2013 31 08 2013 17 06 2013 5 8 486 497 This is an open-access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://politicalwaffle.uk/journal/IJBC/article-abstract/39024D111464 The full text article is available as a PDF file from http://politicalwaffle.uk/journal/IJBC/article-full-text-pdf/39024D111464