TRAIT-ENVIRONMENT ASSOCIATIONS DIVERGE BETWEEN NATIVE AND ALIEN BREEDING BIRD ASSEMBLAGES ON THE WORLD'S OCEANIC ISLANDS.
Rault C,Leprieur F, Barbaro L, Kreft H, Mouquet N, Papaix J, Cagan HS, Violle C & Barnagaud JY (2023).
Global Ecology and Biogeography, DOI:10.1111/geb.13729
Key message : We show that trait-environment associations diverge between native and alien breeding bird assemblages on the world's oceanic islands. 3170 native and 169 naturalized alien species on 4660 islands were analyzed. Overall islands invaded by alien species had similar trait structures as noninvaded ones, however, trait-environment relationships diverged when considering all islands and all species, invaded islands only or alien species only. Trait-environment associations suggest that filters related to the conditions of alien species' introductions explain their distributions in island assemblages better than the constraints associated with isolated environments.
Distributions of the trait structures of island bird assemblages with respect to diets (a, d, g), for mobility-related traits (b, e, h) and body mass (c, f, i). Trait structure is quantified as the standardized effect size (SES) of mean pairwise trait distances compared with a null model and is computed for islands with at least two species with trait data. Light grey: SES values for all oceanic islands with at least two species (diet n = 4628, migration n = 4628, body mass n = 4626); dark grey: SES values for oceanic islands with at least two alien species (diet n = 774, migration n = 774, body mass n = 770).
OTHER TOPICS: Aesthetics of Biodiversity, Biodiversity & Ecosystem Functioning, Biogeography, Macroecology & Ecophylogenetics, Experimental Evolution,
Functional Biogeography, Functional Rarity, Metacommunities, Metaecosystems, Reviews and Synthesis, Trophic Biogeography & Metaweb