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The aim of the study was to assess the impacts of Ruti dam construction on tree species diversity. The study focused on a comparative impact assessment between two localities which are the upper catchment and the lower catchment. A total of 30 quadrats were sampled, 15 on each part of the catchment. Data on the tree species present and their relative abundance was collected from each quadrat. Next, we estimated tree species diversity by calculating the Shannon Weaver Index (H) for each quadrat. The Mann-Whitney U test was then used to test for significance in differences between tree species diversity in the two sections of the catchments. The results showed that tree species diversity, was significantly lower in most quadrats on the upper catchment as compared the downstream of the dam wall. This shows that dam construction despite its importance to agricultural production in semi arid regions can cause a decline in tree species diversity.

Impacts of dam construction on tree species diversity in semi-arid regions: the case of Ruti Dam in Zimbabwe