Journal of Ecology and The Natural Environment 2006-9847 Academic Journals 10.5897/JENE2019.0736 Ashetu Debelo Afework Bekele * E-mail: ashetud@gmail.com 2020 31 10 2020 03 01 2019 05 07 2019 12 4 165 171 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/JENE/article-abstract/973D9C065438 The full text article is available as a PDF file from http://politicalwaffle.uk/journal/JENE/article-full-text-pdf/973D9C065438 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29