Spatial structure in invasive Alliaria petiolata reflects restricted seed dispersal.

摘要: Identification of processes that shape the spatial structure invasive species has important implications for understanding population regulation. In Alliaria petiolata we quantified (1) scale seed dispersal under field conditions, (2) rosette and adult density (3) relative importance environmental filtering, propagule pressure adult-rosette interactions in shaping density. We conducted a experiment conditions; 3 year survey measured quadrat-level density, production soil moisture light along transects three A. populations at Koffler Scientific Reserve Southern Ontario, Canada. Propagule was estimated based on neighbourhood production. found followed lognormal distribution with mean distance 1.82 m, both adults (Moran’s I: 0.30–0.56) rosettes (0.48–0.57) significant up to 2 m. were associated whereas most process However, due observational nature data, it is difficult determine whether observed negative association between related competition or temporal variation density-dependent Overall, conclude spatially restricted factor underlying this species’ patchy distributions.