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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2191

Title: AN INVESTIGATION OF AMPHIBIAN DIVERSITY AND ABUNDANCE IN RELATION TO ENVIRONMENTAL CHANGE IN HARENNA FOREST, BALE MOUNTAINS NATIONAL PARK, ETHIOPIA
Authors: Roman, Kassahun
Advisors: Professor Samy A.Saber,
Dr. Simon Loader,
Keywords: Amphibian
Harenna Forest,
Diversity
Abundance
Environmental change
Copyright: Jul-2009
Date Added: 3-May-2012
Abstract: Abstract Amphibian diversity and abundance in relation to environmental change in Harenna Forest, BMNP was assessed using four complementary methods: amphibian sampling, GIS and Remote sensing, measuring and analysis of Developmental Instability (DI) in frogs and conducting focus group discussions. Sampling of amphibian communities was conducted during July-August 2008 and February 2009; which includes wet and dry seasons in the area. Systematic sampling survey, Random search, VES and AES methods were used to determine the current abundance, distribution and diversity of the amphibians. Data on diversity, evenness and dominance was analyzed using Shannon- Weaver’s (H) index and Simpson’s diversity index (D). The total number of individuals encountered in both seasons equals 159. Number of amphibians as determined from the total count was 54 and 105 individuals during the wet and dry seasons, respectively. Seven endemic amphibian species which belong to one order, 4 families and 6 genera were recorded. The current number and species of amphibians was compared with the past investigation of amphibians in the Harenna Forest known as the 1986 Harenna Forest expedition. The results show a decrease in abundance and diversity of amphibians over the past 20 years given the intensive sampling in the present investigation. GIS and Remote sensing methods using satellite images of the Harenna Forest were used to quantitatively analyze land use/land cover changes from 1973 to 2000. The results show a significant reduction in the forest cover and wetlands followed by the establishment of new land use types such as agricultural land and settlement in 2000. Measurement and analysis of DI in frogs revealed that the frogs collected in the present investigation show anti symmetry in the left and right differences, which is an indication of unhealthy environment or that frogs are at risk of declining. x i Focus group discussions were conducted with the local people living in Harenna Forest to qualitatively assess their awareness about environmental change and its influence on their daily life. It is manifested that local people are aware of change in their environment. Findings from the four methodological approaches revealed the number of amphibians have declined over the past 20 years.
URI: http://hdl.handle.net/123456789/2191
Appears in:Thesis - Environmental Sciences

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