Impact of Area Enclosures on Density and Diversity of Large Wild Mammals: The Case of May Ba’ti, Douga Tembien District, Central Tigray, Ethiopia

Abstract

In Ethiopian highlands, area enclosures have been established on degraded areas for ecological rehabilitation. However, information on the importance of area enclosures in improving wild fauna richness is lacking. Thus, this study was conducted to assess the impact of enclosures on density and diversity of large wild mammals. Direct observations along fixed width transects with three timings, total counting with two timings, and pellet drop counts were used to determine population of large wild mammals. Regression analysis and ANOVA were used to test the significance of the relationships among age of enclosures, canopy cover, density and diversity of large wild mammals. The enclosures have higher density and diversity of large wild mammals than adjacent unprotected areas. The density and diversity of large wild mammals was higher for the older enclosures with few exceptions. Diversity of woody species also showed strong relationship (r2 = 0.77 and 0.92) with diversity of diurnal and nocturnal wild mammals. Significant relationship (at p<0.05) was observed between age and density as well as among canopy cover, density and diversity of large nocturnal wild mammals. The existence of both large carnivore and herbivore wild mammals indicated the effectiveness of area enclosures in biodiversity conservation. However, for further improvement of the habitat and thereby biodiversity, development of water points and vegetation management are timely needed.

Keywords: Area Enclosure; Density; Diversity; Ethiopia; Large Wild Mammal

East African Journal of Sciences Vol. 1 (1) 2007: pp. 55-68