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• W2018552667 abstract "Abstract Questions Several studies have described aggregated spatial patterns in tropical tree species. This study investigates aggregate dynamics of V ouacapoua americana ( A ublet), a climax species whose spatial pattern is not simply related to light and soil conditions or to its short seed dispersal range. Location Two rain forest sites: N ouragues and P aracou, in the G uiana S hield. Methods We described the spatial pattern of tree locations and spatial autocorrelation of tree diameters, using statistics derived from R ipley's K . We particularly used methods to define analysis subplots according to local density or local mean diameter. We investigated relationships between spatial distributions of adults and saplings. Results At both sites, populations of V ouacapoua demonstrated several nested levels of aggregation. Tree diameters were spatially autocorrelated, revealing the existence of clusters with similar diameters. In the largest aggregates, tree diameters declined from the centre to the edge. Regeneration was aggregated and occurred mainly at cluster edges and around rare isolated trees, and sapling densities and basal area of adults were negatively correlated. We show that long‐distance dispersal events are rare. Conclusions Environmental factors and seed dispersal only explain part of the observed spatial patterns. We provide two main hypotheses about V ouacapoua population dynamics. First, the lack of regeneration in aggregate centres results in the ageing of existing aggregates. We suggest that this lack of recruitment close to mature trees is due to a J anzen– C onnell effect. However, aggregates can continue to grow along colonization fronts. Second, long‐distance dispersal events allow the formation of new clusters and play a crucial role in the colonization process." @default.
• W2018552667 created "2016-06-24" @default.
• W2018552667 creator A5003059014 @default.
• W2018552667 creator A5007104507 @default.
• W2018552667 date "2013-04-17" @default.
• W2018552667 modified "2023-10-17" @default.
• W2018552667 title "Birth and life of tree aggregates in tropical forest: hypotheses on population dynamics of an aggregated shade-tolerant species" @default.
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• W2018552667 doi "https://doi.org/10.1111/jvs.12080" @default.
• W2018552667 hasPublicationYear "2013" @default.
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