Articles, Conference and Workshop Papers Collection

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Browsing Articles, Conference and Workshop Papers Collection by Author "Hassan, Shombe N"

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    Factors and ecological impacts of wildlife habitat destruction in the Serengeti ecosystem in Northern Tanzania
    (2006-04) Kideghesho, Jafari R; Nyahongo, Julius W; Hassan, Shombe N; Tarimo, Thadeo C; Mbije, Nsajigwa E
    Despite the considerable worldwide efforts to establish the wildlife protected areas - a strategy construed as the most feasible in maintaining the high quality habitats for healthy wildlife populations - destruction of wildlife habitats has remained the leading threat to biodiversity. This destruction, taking different forms (i.e. degradation, fragmentation or outright loss) is a function of the growing human activities - prompted mainly by such factors as poverty, demographic factors, land tenure systems, inadequate conservation status, development policies and economic incentives. This paper reviews these contributing factors and presents the associated ecological impacts – manifested by a decline of wildlife populations and local extinction of species. Provision of adequate conservation status to critical wildlife habitats, addressing the problem of human population growth, adoption of poverty reduction strategies that are conservation- friendly and discouraging the destructive development policies are recommended as the measures to mitigate the problem. Other measures entail genuine involvement of the local communities in conservation, provision of adequate economic incentives, relevant research and participatory land use planning. In conclusion, the paper argues that, given the nature of the problem, if a lasting solution is to be realized, habitat loss should be viewed as a multisectoral rather than a single sectoral issue. Therefore different stakeholders should play an active role in halting and pre-empting the problem. We propose criteria for selection of the relevant stakeholders
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    Population structure and exploitation of three commercial tree species in Nguru ya Ndege Forest Reserve, Morogoro – Tanzania
    (2010) Modest, Robert B; Maganga, S.L.S; Hassan, Shombe N; Mariki, Sayuni B; Muganda, Michael
    Forests in tropical environments are unstable and hardly maintain fixed climax species composition over long periods. They are victims of modifications by variety of factors including human influences that result in long lasting disturbances. Having observed this, we investigated the population structure and rate of exploitation for three commercial tree species namely, Dalbergia melanoxylon, Pterocarpus angolensis and Afzelia quanzensis in Nguru ya Ndege Forest Reserve. Objectives were to determine the density, DBH distribution and the harvesting rate. We employed simple random procedure to select sampling points, where a map of the reserve was used to divide the study area into 100 equal grids. Fifty grids were then picked randomly, and within these grids, 20 by 20 m quadrats were established for counting stumps and trees with DBH ≥ 4 cm. In addition, saplings with DBH of ≤ 4 cm were counted inside 5 by 5 m quadrats placed within the 20 by 20 m quadrats. Results showed that, the density of P. angolensis was 19 stems/ha, A. quanzensis 8 stems/ha and D. melanoxylon 3.1 stems/ha. DBH graphs showed characteristic inversed J shapes for P. angolensis and A. quanzensis, but broken pattern for D. melanoxylon. Harvesting rates (stumps/ha) was 4.5 for A. quanzensis, 4.0 for P. angolensis and 1 for D. melanoxylon. We concluded that, all target species were found facing harvesting pressure, with the population structure of D. melanoxylon being disturbed. We recommended that harvest of trees in the reserve should be controlled.