Aims Invasive plants modify the structure and functioning of natural en-vironments and threat native plant communities.Invasive species are often favored by human interference such as the creation of arti-ficial fores...Aims Invasive plants modify the structure and functioning of natural en-vironments and threat native plant communities.Invasive species are often favored by human interference such as the creation of arti-ficial forest edges.Field removal experiments may clarify if invasive plants are detrimental to native plant regeneration and how this is related to other local factors.We assessed the joint effect of envir-onment and competition with the invasive Tradescantia zebrina on tree species recruitment in an Atlantic Forest fragment.Methods We carried out the experimental study in the Iguaçu National Park,located in southern Brazil,using 30 plots distributed across five invaded sites during 6 months.We counted T.zebrina leaves and recorded the abundance and height of tree recruits over time under contrasting environmental(forest edge vs.forest interior)and removal(all aboveground biomass,only T.zebrina removal,and control)treatments.We analyzed the effects of environment and re-moval treatment using generalized linear mixed models.Important Findings The invasive species performed better at the forest edge than in the interior.The higher competitive pressure of T.zebrina led to higher mortality and lower height of tree recruits.Invader removal favored tree recruitment,especially in the forest interior.Our study shows that T.zebrina hampers woody species regeneration in tropical Atlantic Forests,especially at the forest edge.展开更多
文摘Aims Invasive plants modify the structure and functioning of natural en-vironments and threat native plant communities.Invasive species are often favored by human interference such as the creation of arti-ficial forest edges.Field removal experiments may clarify if invasive plants are detrimental to native plant regeneration and how this is related to other local factors.We assessed the joint effect of envir-onment and competition with the invasive Tradescantia zebrina on tree species recruitment in an Atlantic Forest fragment.Methods We carried out the experimental study in the Iguaçu National Park,located in southern Brazil,using 30 plots distributed across five invaded sites during 6 months.We counted T.zebrina leaves and recorded the abundance and height of tree recruits over time under contrasting environmental(forest edge vs.forest interior)and removal(all aboveground biomass,only T.zebrina removal,and control)treatments.We analyzed the effects of environment and re-moval treatment using generalized linear mixed models.Important Findings The invasive species performed better at the forest edge than in the interior.The higher competitive pressure of T.zebrina led to higher mortality and lower height of tree recruits.Invader removal favored tree recruitment,especially in the forest interior.Our study shows that T.zebrina hampers woody species regeneration in tropical Atlantic Forests,especially at the forest edge.
