Reproductive patterns in invasive and native Impatiens species

摘要

Traits associated with early ontogenetic stages are among the key factors determining the spread of alien plants in their secondary distribution areas (Pysek et al 2007, Grotkopp et al 2007). Those associated with generative reproduction are of crucial importance especially in annual species reproducing exclusively by seed (Crawley et al 1996). Invasion success of some alien plants is considered to be associated with inter-population differentiation and adaptations to local conditions ( Dietz era/ 2006). To obtain an insight into these processes we investigated three species of Impatiens (Balsaminaceae) with different origin and invasion status.