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Article dans une revue

Geographical variation in community divergence: Insights from tropical forest monodominance by ectomycorrhizal Trees

Abstract : Convergence occurs in both species traits and community structure, but how convergence at the two scales influences each other remains unclear. To address this question, we focus on tropical forest monodominance, in which a single, often ectomycorrhizal (EM) tree species occasionally dominates forest stands within a landscape otherwise characterized by diverse communities of arbuscular mycorrhizal (AM) trees. Such monodominance is a striking potential example of community divergence resulting in alternative stable states. However, it is observed only in some tropical regions. A diverse suite of AM and EM trees locally codominate forest stands elsewhere. We develop a hypothesis to explain this geographical difference using a simulation model of plant community assembly. Simulation results suggest that in a region with a few EM species (e.g., South America), EM trees experience strong selection for convergent traits that match the abiotic conditions of the environment. Consequently, EM species successfully compete against other species to form monodominant stands via positive plant-soil feedbacks. By contrast, in a region with many EM species (e.g., Southeast Asia), species maintain divergent traits because of complex plant-soil feedbacks, with no species having traits that enablemonodominance. An analysis of plant trait data from Borneo and Peruvian Amazon was inconclusive. Overall, this work highlights the utility of geographical comparison in understanding the relationship between trait convergence and community convergence.
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https://hal.inrae.fr/hal-02622545
Déposant : Migration Prodinra <>
Soumis le : mardi 26 mai 2020 - 05:59:22
Dernière modification le : vendredi 26 février 2021 - 03:30:52

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Tadashi Fukami, Mifuyu Nakajima, Claire Fortunel, Paul V. A. Fine, Christopher Baraloto, et al.. Geographical variation in community divergence: Insights from tropical forest monodominance by ectomycorrhizal Trees. American Naturalist, University of Chicago Press, 2017, 190, pp.105-122. ⟨10.1086/692439⟩. ⟨hal-02622545⟩

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