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Breeding Bird Community Structure and Species Diversity along an Ecological Gradient in Deciduous Forest in Western Norway

Nils Røv
Ornis Scandinavica (Scandinavian Journal of Ornithology)
Vol. 6, No. 1 (1975), pp. 1-14
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3676274
Stable URL: http://www.jstor.org/stable/3676274
Page Count: 14
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Breeding Bird Community Structure and Species Diversity along an Ecological Gradient in Deciduous Forest in Western Norway
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Abstract

The passerine community was censused by territorial mapping at four different points along a forest gradient. For each community, species diversity was calculated by Shannon's formula, and dominance index by summing the relative abundance values of the two most abundant species. Diversity and dominance were negatively correlated. Foliage profiles in each plot were estimated, and diversity of stratification calculated by Shannon's formula. An index of vegetation cover was calculated as the sum of the cover values of the shrub and tree layers. Bird species diversity was positively correlated with both vegetation cover and diversity of stratification, whereas dominance index was negatively correlated with the same factors. The way of subdividing the vegetation which gave the best correlations was: 1) all nonwoody plants, 2) all woody plants < 3 m above ground-level, and 3) all woody plants > 3 m.

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