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Time-lag in biological responses to landscape changes in a highly dynamic Atlantic forest region

Texto completo
Metzger, Jean Paul [1] ; Martensen, Alexandre Camargo [2] ; Dixo, Marianna [3] ; Bernacci, Luis Carlos [4] ; Ribeiro, Milton Cezar [5] ; Godoy Teixeira, Ana Maria [6] ; Pardini, Renata [7]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Sao Paulo. Dept Ecol
[2] Univ Sao Paulo. Dept Ecol
[3] Univ Sao Paulo. Dept Ecol
[4] Inst Agron Campinas. BR-13001970 Campinas
[5] Univ Sao Paulo. Dept Ecol
[6] Univ Sao Paulo. Dept Ecol
[7] Univ Sao Paulo. Dept Zool
Número total de Afiliações: 7
Tipo de documento: Artigo Científico
Fonte: Biological Conservation; v. 142, n. 6, SI, p. 1166-1177, JUN 2009.
Citações Web of Science: 194

Time-lagged responses of biological variables to landscape modifications are widely recognized, but rarely considered in ecological studies. In order to test for the existence of time-lags in the response of trees, small mammals, birds and frogs to changes in fragment area and connectivity, we studied a fragmented and highly dynamic landscape in the Atlantic forest region. We also investigated the biological correlates associated with differential responses among taxonomic groups. Species richness and abundance for four taxonomic groups were measured in 21 secondary forest fragments during the same period (2000-2002), following a standardized protocol. Data analyses were based on power regressions and model selection procedures. The model inputs included present (2000) and past (1962, 1981) fragment areas and connectivity, as well as observed changes in these parameters. Although past landscape structure was particularly relevant for trees, all taxonomic groups (except small mammals) were affected by landscape dynamics, exhibiting a time-lagged response. Furthermore, fragment area was more important for species groups with lower dispersal capacity, while species with higher dispersal ability had stronger responses to connectivity measures. Although these secondary forest fragments still maintain a large fraction of their original biodiversity, the delay in biological response combined with high rates of deforestation and fast forest regeneration imply in a reduction in the average age of the forest. This also indicates that future species losses are likely, especially those that are more strictly-forest dwellers. Conservation actions should be implemented to reduce species extinction, to maintain old-growth forests and to favour the regeneration process. Our results demonstrate that landscape history can strongly affect the present distribution pattern of species in fragmented landscapes, and should be considered in conservation planning. (C) 2009 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 99/05123-4 - Conservação da biodiversidade em paisagens fragmentadas no Planalto Atlântico de São Paulo (Brasil)
Beneficiário:Jean Paul Walter Metzger
Linha de fomento: Auxílio à Pesquisa - Programa BIOTA - Temático