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Differential Changes in Bird Community Structure with Urbanisation: A Study in Central Finland
Ornis Scandinavica (Scandinavian Journal of Ornithology)
Vol. 9, No. 1 (1978), pp. 94-100
Stable URL: http://www.jstor.org/stable/3676143
Page Count: 7
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The breeding bird community at Kuopio, Central Finland, was studied on 14 plots representing five urban habitats. Diversity (H′) decreased with increasing urbanisation (measured as decreasing plant volume), but the evenness component of diversity (J′) and density were not correlated to urbanisation. This decline was confirmed by studying area-diversity relations in each habitat. Density and diversity or density and effective species number. exp(H′), showed no correlation. Diversity correlated strongly with actual species number but weakly with evenness. The number of birds per species was predicted in a linear fashion by relative constancy of species. Edge heterogeneity increased bird species diversity but had no influence on density or evenness. The results suggest that urbanisation affects bird communities rather by decreasing species richness than by changing species-abundance pattern. Furthermore, density and diversity are not regulated jointly. A mosaic distribution of urban habitats may alleviate the impact of urbanisation on bird populations.
Ornis Scandinavica (Scandinavian Journal of Ornithology) © 1978 Nordic Society Oikos