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2023-06

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cc-by (c) Peguero, Guille et al., 2023
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/220780

Nutrient-based species selection is a prevalent driver of community assembly and functional trait space in tropical forests

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https://doi.org/10.1111/1365-2745.14089

Abstract

1.Soil nutrient availability and functional traits interact in complex ways during the assembly of tree communities hindering our understanding of the implications that this may have for their phylogenetic and functional diversity. 2.We combined abundance, taxonomic, phylogenetic and functional trait data of 222 tree species distributed along nutrient concentration gradients at 24 plots in two tropical forest study sites. We analysed micro and macronutrient concentration in organic and topsoil horizons and tested for the following: (1) nutrient-based species sorting due to contrasting trait–environment relationships, (2) whether nutrient filtering has consequences for phylogenetic and functional diversity, and functional space size and occupancy and (3) we mapped trait distributions across the phylogeny of tree species to track the evolutionary signature of nutrient availability. 3.We found that total nitrogen (N), available phosphorus and total potassium in soil accounted for 68% of the variation in tropical tree species community composition, with strong associations with nutrient concentration for 89% of the tree species included in the analysis. This nutrient-based species selection was mediated by interactions between the three soil nutrient concentrations with leaf nitrogen, leaf thickness and wood density. Soil N concentration was positively associated with the functional space at site level. At plot level, soil N concentration positively correlated with functional evenness and it was negatively associated with the functional space not occupied by any species in the tree community. Despite the phylogenetic conservatism of leaf N across tree lineages even when not considering legumes, many sister-species pairs show contrasting values which match with their habitat preferences thus indicating the evolutionary lability of this trait, particularly within recently diversified clades. 4.Synthesis. Our results demonstrate that soil nutrient-based species selection is a prevalent driver of community assembly in tropical forests, a process mediated by key functional traits within the leaf and wood economics spectrum. Functional space size and its filling increase with soil nutrient concentration, whereas niche vacancy decreases. This selection process has likely influenced tropical tree species diversification patterns via habitat specialization.

Subject

Guaiana Francesa, Taxonomia botànica, Nutrients (Medi ambient), Selves pluvials, Filogènia (Botànica)

Subject (English)

French Guiana, Botanical taxonomy, Nutrients (Ecology), Rain forests, Phylogeny (Botany)

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Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

Citation

PEGUERO, Guille, et al. Nutrient-based species selection is a prevalent driver of community assembly and functional trait space in tropical forests. Journal of Ecology. 2023. Vol. 111, num. 6, pags. 1218-1230. ISSN 0022-0477. [consulted: 10 of June of 2026]. Available at: https://hdl.handle.net/2445/220780

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