Niche breadth of Amazonian trees increases with niche optimum across broad edaphic gradients - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Ecology Year : 2023

Niche breadth of Amazonian trees increases with niche optimum across broad edaphic gradients

C. E. Timothy Paine
Juan Ernesto Guevara Andino

Abstract

Understanding how biotic interactions and environmental filtering mediated by soil properties shape plant community assembly is a major challenge in ecology, especially when studying complex and hyperdiverse ecosystems like tropical forests. To shed light on the influence of both factors, we examined how the edaphic optimum of species (their niche position) related to their edaphic range (their niche breadth) along different environmental gradients and how this translates into functional strategies. Here we tested four scenarios describing the shape of the niche breadth—niche position relationship, including one neutral scenario and three scenarios proposing different relative influences of abiotic and biotic factors on community assembly along a soil resource gradient. To do so, we used soil concentration data for five key nutrients (N, P, Ca, Mg, and K), along with accurate measurements of 14 leaf, stem, and root traits for 246 tree species inventoried in 101 plots located across Eastern (French Guiana) and Western (Peru) Amazonia. We found that species niche breadth increased linearly with species niche position along each soil nutrient gradient. This increase was associated with more resource acquisitive traits in the leaves and the roots for soil N, Ca, Mg, and K concentration, while it was negatively associated with wood density for soil P concentration. These observations agreed with one of our hypothetical scenarios in which species with resource conservation traits are confined to the most nutrient-depleted soils (abiotic filter), but they are outperformed by faster-growing species in more fertile conditions (biotic filter). Our results refine and strengthen support for niche theories of species assembly while providing an integrated approach to improving forest management policies.
Fichier principal
Vignette du fichier
Vleminckx_et_al_Ecology_2023_104.pdf (1.51 Mo) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-04098939 , version 1 (26-10-2023)

Identifiers

Cite

Jason Vleminckx, Oscar Valverde Barrantes, Claire Fortunel, C. E. Timothy Paine, David Bauman, et al.. Niche breadth of Amazonian trees increases with niche optimum across broad edaphic gradients. Ecology, 2023, 104 (7), pp.e4053. ⟨10.1002/ecy.4053⟩. ⟨hal-04098939⟩
119 View
67 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More