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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Recasting the dynamic equilibrium model through a functional lens: the interplay of trait-based community assembly and climate (2016)
Auteurs :	Jessy Loranger, Auteur ; Cyrille Violle, Auteur ; Bill Shipley, Auteur ; Sandra Lavorel, Auteur ; Anne Bonis, Auteur ; Pablo Cruz, Auteur ; Frédérique Louault, Auteur ; Grégory Loucougaray, Auteur ; François Mesléard, Auteur ; Nicole Yavercovski, Auteur ; Éric Garnier, Auteur
Type de document :	Article
Dans :	Journal of Ecology (104(3) May 2016)
Article en page(s) :	781-791
Langues:	Anglais
Mots-clés :	TdV ; Restauration environnement ; Communauté écologique ; Ecologie végétale ; Niche écologique ; Prairie
Mots-clés:	Community assembly ; determinants of plant community diversity and structure ; environmental filtering ; facilitation ; functional space ; niche theory ; species packing
Résumé :	According to the dynamic equilibrium hypothesis (DEH), plant species richness is locally controlled by productivity and disturbance. Given that regional conditions widely affect local environmental variables such as soil nutrient availability, the DEH predictions could be improved by considering how climate influences local controls of species richness. Further, a trait-based approach to community assembly has the potential to reveal a deeper, mechanistic understanding of species richness variation across environments. Here, we bring together DEH and trait-based community assembly expectations to examine whether and how local relationships between diversity, disturbance and productivity are affected by habitat filtering and regional climate. The authors specifically tested how gradients of local nutrient availability and disturbance intensity interact with climatic conditions to drive the species richness of grassland communities. Further, the authors recast the DEH through a functional lens by exploring how disturbance–diversity and nutrient availability–diversity relationships are shaped by the functional space occupied by species in a community and species packing within this functional space. The authors’ findings quantitatively highlight the interplay between regional and local environmental gradients in driving community assembly. We demonstrate that, depending on climatic conditions, observed patterns of both taxonomic and functional community composition can be opposite to expected productivity–diversity and disturbance–diversity relationships. This emphasizes the relevance of multifaceted studies of biodiversity and the need for a more systematic quantification of regional controls in community assembly studies.
En ligne :	http://onlinelibrary.wiley.com/doi/10.1111/1365-2745.12536/abstract

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