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Título: Rapid decay of tree-community composition in Amazonian forest fragments
Autor(es): William Laurance
Susan G. Laurance
Andrade, A.
Ribeiro, J. E. L. S.
Juan Pablo Giraldo
Thomas E. Lovejoy
Richard Condit
Jerome Chave
Harms, K. E.
D'Angelo, S.
Henrique Eduardo Mendonca Nascimento
ISSN: 0027-8424
Revista: PNAS. Proceedings of the National Academy of Sciences of the United States of America
Volume: 103
Resumo: Forest fragmentation is considered a greater threat to vertebrates than to tree communities because individual trees are typically long-lived and require only small areas for survival. Here we show that forest fragmentation provokes surprisingly rapid and profound alterations in Amazonian tree-community composition. Results were derived from a 22-year study of exceptionally diverse tree communities in 40 1-ha plots in fragmented and intact forests, which were sampled repeatedly before and after fragment isolation. Within these plots, trajectories of change in abundance were assessed for 267 genera and 1,162 tree species. Abrupt shifts in floristic composition were driven by sharply accelerated tree mortality and recruitment within approximate to 100 m of fragment margins, causing rapid species turnover and population declines or local extinctions of many large-seeded, slow-growing, and old-growth taxa; a striking increase in a smaller set of disturbance-adapted and abiotically dispersed species; and significant shifts in tree size distributions. Even among old-growth trees, species composition in fragments is being restructured substantially, with subcanopy species that rely on animal seed-dispersers and have obligate outbreeding being the most strongly disadvantaged. These diverse changes in tree communities are likely to have wide-ranging impacts on forest architecture, canopy-gap dynamics, plant-animal interactions, and forest carbon storage.
ISSN: 0027-8424
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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