Impact of forest structure simplification on bird species richness in the Harena forest of the Bale Mountains National Park (BMNP), South Eastern Ethiopia

Anteneh Shimelis, Mitchell Pinard, Addisu Asefa

Research output: Contribution to journalArticle

Abstract

Human simplification of habitat in the Harenna forest mainly happens by permanently removing woody vegetation. We evaluated the impact of such simplification of habitat on bird species richness. Birds were counted using the point count method at points that were laid out along transect lines, and from their presence/absence, species richness was worked out. By establishing 50m by 50m quadrats at bird counting stations, we counted the number of basal remnants of cut trees and we measured vegetation structure variables such as % grass, % other herbs, % shrubs, % bush and % canopy (tree cover). Tree, bush and shrub covers did have significant positive correlation with bird species richness. As the magnitude of tree cutting increased species richness of birds declined significantly. Similarly with bird species richness, structural variables such as tree, bush and shrub covers did have significant negative correlation with the tree cutting variable. Due to this, we carried out Principal Component Analysis and the first component that was influenced mainly by tree cover and tree cutting variables significantly explained 84.7 % of the variation in bird species richness in a stepwise multiple regression analysis. Bush and shrub cover did also have significant positive contributions towards the explanatory value of the first component, thus, their positive contribution in explaining bird species richness is noteworthy. Results showed habitat simplification through tree cutting has significant negative impact on bird species richness.

Original languageEnglish
Pages (from-to)321-324
Number of pages4
JournalNature Environment and Pollution Technology
Volume12
Issue number2
Publication statusPublished - 1 Jan 2013

Fingerprint

Birds
national park
species richness
mountain
shrub
bird
habitat
bird species
line transect
vegetation structure
Regression analysis
Principal component analysis
herb
multiple regression
principal component analysis
regression analysis
canopy
grass
cutting (process)
vegetation

Keywords

  • Bird species richness
  • Habitat simplification
  • Habitat structure
  • Harena forest
  • Tree cutting

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)

Cite this

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title = "Impact of forest structure simplification on bird species richness in the Harena forest of the Bale Mountains National Park (BMNP), South Eastern Ethiopia",
abstract = "Human simplification of habitat in the Harenna forest mainly happens by permanently removing woody vegetation. We evaluated the impact of such simplification of habitat on bird species richness. Birds were counted using the point count method at points that were laid out along transect lines, and from their presence/absence, species richness was worked out. By establishing 50m by 50m quadrats at bird counting stations, we counted the number of basal remnants of cut trees and we measured vegetation structure variables such as {\%} grass, {\%} other herbs, {\%} shrubs, {\%} bush and {\%} canopy (tree cover). Tree, bush and shrub covers did have significant positive correlation with bird species richness. As the magnitude of tree cutting increased species richness of birds declined significantly. Similarly with bird species richness, structural variables such as tree, bush and shrub covers did have significant negative correlation with the tree cutting variable. Due to this, we carried out Principal Component Analysis and the first component that was influenced mainly by tree cover and tree cutting variables significantly explained 84.7 {\%} of the variation in bird species richness in a stepwise multiple regression analysis. Bush and shrub cover did also have significant positive contributions towards the explanatory value of the first component, thus, their positive contribution in explaining bird species richness is noteworthy. Results showed habitat simplification through tree cutting has significant negative impact on bird species richness.",
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