Disturbance Regimes Drive The Diversity of Regional Floristic Pools Across Guianan Rainforest Landscapes

Scientific Reports
Stéphane GuitetGrégoire Vincent

Abstract

Disturbances control rainforest dynamics, and, according to the intermediate disturbance hypothesis (IDH), disturbance regime is a key driver of local diversity. Variations in disturbance regimes and their consequences on regional diversity at broad spatiotemporal scales are still poorly understood. Using multidisciplinary large-scale inventories and LiDAR acquisitions, we developed a robust indicator of disturbance regimes based on the frequency of a few early successional and widely distributed pioneer species. We demonstrate at the landscape scale that tree-species diversity and disturbance regimes vary with climate and relief. Significant relationships between the disturbance indicator, tree-species diversity and soil phosphorus content agree with the hypothesis that rainforest diversity is controlled both by disturbance regimes and long-term ecosystem stability. These effects explain the broad-scale patterns of floristic diversity observed between landscapes. In fact, species-rich forests in highlands, which have benefited from long-term stability combined with a moderate and regular regime of local disturbances, contrast with less diversified forests on recently shaped lowlands, which have undergone more recent changes an...Continue Reading

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Citations

Sep 27, 2019·Scientific Reports·Hans Ter SteegeKarina Melgaço
Aug 31, 2019·The Science of the Total Environment·Lixia XuanJinbo Xiong
Mar 7, 2020·The Science of the Total Environment·A MirabelE Marcon

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Methods Mentioned

BETA
PCA

Software Mentioned

Rstan
ArcMap
R MASS
ade4
ArcMap10
R
glmulti
R bms
R geoR package

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