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|Title:||Shifting dynamics of climate-functional groups in old-growth Amazonian forests|
Malhi, Yadvinder Singh
New, Mark G.
Macía, Manuel J.
Lewis, Simon L.
Laurance, William F.
Laurance, Susan G.W.
Luizâo, Regina Celi Costa
Andrade, Ana C.S.
Baker, Timothy R.
Almeida, Samuel Miranda
Phillips, Oliver L.
|metadata.dc.publisher.journal:||Plant Ecology and Diversity|
|metadata.dc.relation.ispartof:||Volume 7, Número 1-2, Pags. 267-279|
|Abstract:||Background: Climate change is driving ecosystem shifts, which has implications for tropical forest system function and productivity. Aim: To investigate Amazon forest dynamics and test for compositional changes between 1985 and 2005 across different plant groups. Methods: Tree census data from 46 long-term RAINFOR forest plots in Amazonia for three climate-functional groups were used: dry-affiliate, climate-generalist and wet affiliate. Membership of each group was ascribed at genus level from the distribution of individuals across a wet-dry gradient in Amazonia, and then used to determine whether the proportions of these functional groups have changed over time, and the direction of any change. Results: In total, 91 genera, representing 59% of the stems and 18% of genera in the plots, were analysed. Wet-affiliates tended to move from a state of net basal area gain towards dynamic equilibrium, defined as where gain ≈ loss, governed by an increase in loss rather than a decrease in growth and mainly driven by plots in north-west Amazonia, the wettest part of the region. Dry-affiliates remained in a state of strong net basal area gain across western Amazonia and showed a strong increase in stem recruitment. Wet-affiliates and climate-generalists showed increases in stem mortality, and climate-generalists showed increased stem recruitment, resulting in overall equilibrium of stem numbers. Conclusions: While there were no significant shifts in most genera, the results suggest an overall shift in climate-functional forest composition in western Amazonia away from wet-affiliates, and potential for increased forest persistence under projected drier conditions in the future. © 2014 Copyright 2012 Botanical Society of Scotland and Taylor & Francis.|
|Appears in Collections:||Artigos|
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