0 UNIVERSITY OF SOUTH AFRICA SCHOOL OF GRADUATE STUDIES Assessment of the Impact of Anthropogenic Activities on Water Quality, Biodiversity and Livelihood in Lake Tana, Northwestern Ethiopia By: Sisay Misganaw Tamiru (SM Tamiru) Submitted in accordance with requirements for the degree of DOCTOR OF PHILOSOPHY In the subject of ENVIRONMENTAL SCIENCE at the UNIVERSITY OF SOUTH AFRICA SUPERVISOR: Prof. Hlanganani Tutu (University of the Witwatersrand), South Africa CO-SUPERVISOR: Prof. Seyoum Mengistu Yilma (Addis Ababa University), Ethiopia September, 2018