title: Functional diversity enhances the resistance of ecosystem multifunctionality to aridity in Mediterranean drylands.
abstract: We used a functional trait-based approach to assess the impacts of aridity and shrub encroachment on the functional structure of Mediterranean dryland communities (functional diversity (FD) and community-weighted mean trait values (CWM)), and to evaluate how these functional attributes ultimately affect multifunctionality (i.e. the provision of several ecosystem functions simultaneously). Shrub encroachment (the increase in the abundance/cover of shrubs) is a major land cover change that is taking place in grasslands worldwide. Studies conducted on drylands have reported positive or negative impacts of shrub encroachment depending on the functions and the traits of the sprouting or nonsprouting shrub species considered. FD and CWM were equally important as drivers of multifunctionality responses to both aridity and shrub encroachment. Size traits (e.g. vegetative height or lateral spread) and leaf traits (e.g. specific leaf area and leaf dry matter content) captured the effect of shrub encroachment on multifunctionality with a relative high accuracy (r(2)  = 0.63). FD also improved the resistance of multifunctionality along the aridity gradient studied. Maintaining and enhancing FD in plant communities may help to buffer negative effects of ongoing global environmental change on dryland multifunctionality.
authors.affiliation: Área de Biodiversidad y Conservación, Departamento de Biología y Geología, Física y Química Inorgánica, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933, Móstoles, Spain.
authors.forename: Enrique
authors.initials: E
authors.lastname: Valencia
authors.forename: Fernando T
authors.initials: FT
authors.lastname: Maestre
authors.forename: Yoann
authors.initials: Y
authors.lastname: Le Bagousse-Pinguet
authors.forename: José Luis
authors.initials: JL
authors.lastname: Quero
authors.forename: Riin
authors.initials: R
authors.lastname: Tamme
authors.forename: Luca
authors.initials: L
authors.lastname: Börger
authors.forename: Miguel
authors.initials: M
authors.lastname: García-Gómez
authors.forename: Nicolas
authors.initials: N
authors.lastname: Gross
mesh_terms: D000220:Adaptation, Biological; D044822:Biodiversity; D017753:Ecosystem; D019083:Mediterranean Region; D008954:Models, Biological; D018515:Plant Leaves / Q000378:metabolism; D018521:Plant Physiological Phenomena; D010944:Plants / Q000378:metabolism*; D014867:Water / Q000502:physiology
chemical_list: D014867:Water
keywords: aridity; drylands; functional biogeography; functional diversity (FD); global change; multifunctionality; shrub encroachment; traits