Continental-scale patterns of canopy tree composition and function across Amazonia

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Abstract

The world's greatest terrestrial stores of biodiversity and carbon are found in the forests of northern South America, where large-scale biogeographic patterns and processes have recently begun to be described1,2,3,4. Seven of the nine countries with territory in the Amazon basin and the Guiana shield have carried out large-scale forest inventories, but such massive data sets have been little exploited by tropical plant ecologists5,6,7,8. Although forest inventories often lack the species-level identifications favoured by tropical plant ecologists, their consistency of measurement and vast spatial coverage make them ideally suited for numerical analyses at large scales, and a valuable resource to describe the still poorly understood spatial variation of biomass, diversity, community composition and forest functioning across the South American tropics9. Here we show, by using the seven forest inventories complemented with trait and inventory data collected elsewhere, two dominant gradients in tree composition and function across the Amazon, one paralleling a major gradient in soil fertility and the other paralleling a gradient in dry season length. The data set also indicates that the dominance of Fabaceae in the Guiana shield is not necessarily the result of root adaptations to poor soils (nodulation or ectomycorrhizal associations) but perhaps also the result of their remarkably high seed mass there as a potential adaptation to low rates of disturbance.

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Figure 1: Geographic variation in community characteristics of South American tree communities.
Figure 2: Relationships between community characteristics of South American tree communities and community characteristics with abiotic factors.

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Acknowledgements

We thank the Guyana Forestry Commission, the Center for Agricultural Research in Suriname (CELOS), Cirad-Forêt, Office National des Forêts (ONF) and Aernout Weeda of Zonisig for making data available for this research; P. Haripersaud for typing in practically all of the RADAMBRASIL data; and P.-M. Forget, M. Werger, H. During and M. Pascal for discussions and comments on the manuscript. This work would not have been possible without decades of dedicated fieldwork by hundreds of colleagues and forestry workers across South America.

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Correspondence to Hans ter Steege.

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Supplementary information

Supplementary Notes 1

This file contains Supplementary Analyses, Supplementary Tables 1–2 and Supplementary Figures 1–4. (PDF 65 kb)

Supplementary Notes 2

This file contains Supplementary information on the data sources in Supplementary Table 3. (PDF 107 kb)

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