Darwin's naturalization hypothesis: scale matters in coastal plant communities.

摘要: Darwin proposed two seemingly contradictory hypotheses for a better understanding of biological invasions. Strong relatedness invaders to native communities as an indication niche overlap could promote naturalization because appropriate adaptation, but also hamper negative interactions with species ( ‘ ’ s hypothesis ). Although these provide clear and opposing predictions expected patterns in invaded communities, so far no study has been able clearly disentangle the underlying mechanisms. We hypothesize that confl icting past results are mainly due neglected role spatial resolution community sampling. In this study, we corroborate both expectations by using phylogenetic measure testing eff ects sampling highly coastal plant communities. At resolutions fi ne enough detect signatures biotic interactions, nd most less related their nearest relative than chance (phylogenetic overdispersion). Yet at coarser resolutions, assemblages become more invasible closely-related consequence habitat ltering clustering). Recognition importance which studied allows apparently contrasting theoretical empirical be reconciled. Our opens new perspectives on how detect, diff erentiate understand impact ability establish