Niche properties constrain occupancy but not abundance patterns of native and alien woody species across Hawaiian forests

Questions Islands harbour a disproportionate amount of global plant diversity, yet their unique native assemblages are particularly vulnerable to biological invasions. It is therefore critical identify the macroecological constraints that mediate spatial distributions alien species on islands. Here, we examined abundance–occupancy relationships and woody species, role niche properties functional traits related dispersal competition in shaping occupancy abundance patterns. Location Hawaiian Islands. Methods We calculated relative for 64 (42 natives, 22 naturalized aliens), estimated each species' breadth position. fitted phylogenetic hierarchical Bayesian models evaluate impacts species. Results Our analyses revealed locally more abundant were also widespread, but was unrelated occupancy. Yet, found evidence with longer residence times widespread. While widespread both had broad niches, exhibited tendency occur marginal positions than Niche did not affect abundances either or Traits associated capacity competitive ability minimal Conclusions shape across forests. results suggest that, because substantial invasion debts, invasions forests have fully manifest.