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Title: Rapid decay of tree-community composition in Amazonian forest fragments
Authors: Laurance, William F.
Nascimento, Henrique Eduardo Mendonça
Laurance, Susan G.W.
Andrade, Ana C.S.
Ribeiro, José Eduardo L.S.
Giraldo, Juan Pablo
Lovejoy, Thomas E.
Condit, Richard S.
Chave, Jérôme
Harms, Kyle E.
D'Angelo, Sammya Agra
Keywords: Degradation
Forest Dynamics
Forest Fragmentation
Plant Animals Interaction
Population Abundance
Priority Journal
Species Composition
Species Distribution
Tropic Climate
Time Factors
Tropical Climate
Issue Date: 2006
metadata.dc.publisher.journal: Proceedings of the National Academy of Sciences of the United States of America
metadata.dc.relation.ispartof: Volume 103, Número 50, Pags. 19010-19014
Abstract: 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 ≈ 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. © 2006 by The National Academy of Sciences of the USA.
metadata.dc.identifier.doi: 10.1073/pnas.0609048103
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