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Environmental heterogeneity and disturbance by humans control much of the tree species diversity of Atlantic montane forest fragments in SE Brazil

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Plant Conservation and Biodiversity

Part of the book series: Topics in Biodiversity and Conservation ((TOBC,volume 6))

Abstract

The effects of human impact and environmental heterogeneity on the tree species diversity were assessed in 20 fragments of tropical montane seasonal forest in southeastern Brazil. Previous surveys of the tree community, soils and topography of the fragments provided the bulk of the data. The diversity parameters used were the means of species richness, Shannon diversity (H′), and Pielou evenness (J′) obtained from “bootstrap” sub-samplings of 1,000 trees. Morphometric variables obtained for the fragments included total, edge, and inner areas. Investigation forms were used to survey the history of human interventions and prepare an impacts matrix containing scores assigned to assess the extent, severity and duration of selected impacts. Scores for overall environmental impacts were obtained from the ordination scores produced by a multivariate analysis of the impacts matrix. A multivariate analysis of the standard deviations of soil variables was used to identify the variable which contributed most to soil heterogeneity. The same procedure was repeated for the variables related to topography and ground-water regime. The three species diversity parameters were related to the proportions of edges, the overall impacts scores, and the standard deviations of two selected soil and topographic variables. The species diversity in the fragments increased with increasing heterogeneity of both soil chemical properties and topographic features, and decreased with increasing proportion of forest edges. The evenness component of species diversity also increased with increasing severity of overall environmental impacts. This probably occurred because the 20 fragments did not include highly disturbed forests in the range and the intermediate disturbance effect on species diversity was therefore detected.

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Authors and Affiliations

  1. Departamento de Ciências Florestais, Universidade Federal de Lavras, 37200-000, Lavras, MG, Brazil

    José Aldo A. Pereira & Ary T. Oliveira-Filho

  2. Departamento de Botânica, ICB, Universidade Federal de Minas Gerais, 30161-970, Belo Horizonte, MG, Brazil

    José P. Lemos-Filho

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  1. José Aldo A. Pereira
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  2. Ary T. Oliveira-Filho
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  3. José P. Lemos-Filho
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Correspondence to José Aldo A. Pereira .

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David L. Hawksworth Alan T. Bull

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Pereira, J.A.A., Oliveira-Filho, A.T., Lemos-Filho, J.P. (2006). Environmental heterogeneity and disturbance by humans control much of the tree species diversity of Atlantic montane forest fragments in SE Brazil. In: Hawksworth, D.L., Bull, A.T. (eds) Plant Conservation and Biodiversity. Topics in Biodiversity and Conservation, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6444-9_13

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