Incongruent latitudinal patterns of taxonomic, phylogenetic and functional diversity reveal different drivers of caddisfly community assembly across spatial scales

Aim Community assembly processes are difficult to observe in nature but can be inferred from species diversity patterns. However, taxonomic patterns may consistent with multiple explanations, such as habitat filtering or biogeographical processes, which also act differently across spatial scales. Here, we assessed facets of determine the relative contributions local versus regional and historical contemporary factors establishing macroecological Location From Mediterranean peninsulas northern Scandinavia. Time period Species occurrence data gathered since c. 1980. Major organism group studied Trichoptera (Insecta). Methods Based on an extensive functional space a phylogenetic tree including 197 509 species, respectively, composition 180 communities, distribution taxonomic, within 18 ecoregions (local α- β-diversity) among those (regional γ- β-diversity). Results Local estimates β-diversity were similar Europe, reveals that all streams have carrying capacity even though abiotic involved likely different ecoregions. In contrast, diversities decreased latitude increased, whereas richness dispersion displayed unimodal relationships. The position was not conserved, while pools found phylogenetically clustered southern ones overdispersed. nestedness component mainly contributed latitudes turnover dominant. Main conclusions Decoupled latitudinal reveal importance environmental over limiting range shaping pool. signature is still present; recolonizations following Pleistocene glaciations originated exclusively central regions, instead refugia, previously accepted.