AAU-ETD AAU-ETD
 

Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
Faculty of Science >
Thesis - Earth Sciences >

Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2960

Title: ECOSYSTEM VIABILITY ASSESSMENT AND FRAGMENTATION ANALYSIS IN OF BALE MOUNTAINS NATIONAL PARK (Emphasis on Afro-Alpine Ecosystem)
Authors: GETU, ABDISSA
Advisors: Mohammed Umer (PhD)
Keywords: Ecosystem fragmentation,
Ecosystem Viability,
PCA
Bale Mountains National Park.
Copyright: Jun-2010
Date Added: 11-May-2012
Abstract: ABSTRACT Human population growth is fragmenting pristine ecosystems and impacting biological diversity worldwide. Like many National Parks forest fragmentation and degradation due to agricultural expansion are the greatest threats to biodiversity in BMNP. However, despite the presence of fragmentation, there are still opportunities for conserving the remaining ecosystem blocks (Patches) with information on the viable and fragmented Patches. Thus, the objective of this research is to suggest a ranking of ecosystem patches according to their degree of viability (i.e. their capability to preserve its integrity and host its original biodiversity). This study used Pearson correlation coupled with PCA for objective selection of representative metrics among 109 and 72 at Class and patch level, respectively. Pearson correlation (|r|>0.95) reduced 56% of the class and 14% Patch metrics. Then PCA identified 6 and 7 components explaining 96% and 94% of the variance in class and patch metrics, respectively. Accordingly, patch elongation, patch size, core area, contiguity, proximity and Euclidean Nearest Neighbor were selected the 7 PCA components for ecosystem viability assessment. Weighted sum equations combining representative metrics using percent of variance explained by each axes of the PCA gave fragmentation Index and ecosystem viability map ranking classes and patches as high, moderate and low, respectively. This systematic approach of creating a fragmentation index and ecosystem viability assessment is not only a useful method that can be replicated in other regions, but the information provided in the form of maps can also be valuable guide to ecologists, natural resource managers, and planners to orient land use planning for optimal allocation of land resources.
URI: http://hdl.handle.net/123456789/2960
Appears in:Thesis - Earth Sciences

Files in This Item:

File Description SizeFormat
GETU ABDISSA.pdf5.09 MBAdobe PDFView/Open

Items in the AAUL Digital Library are protected by copyright, with all rights reserved, unless otherwise indicated.

 

  Last updated: May 2010. Copyright © Addis Ababa University Libraries - Feedback