Differences in seed production of Rosa rugosa between the Invasive populations of Northwest Europe and the native populations of China

摘要

Rosarugosa has gathered a lot of attention in past three decades because of its wide invasion in Northwest Europe and rapid declining in China (Bruun 2005, Chen ef al 2008). The importance of seed production and seedling emergence to establishment ofR. rugosa in the invasive dune habitats of NW Europe has been confirmed (Kollmann et al 2006), and low seed quality and germination rates from declining populations have been reported (Chen et al 2008). Seed production is a key factor impacting seedlingrecruitment, but there is no comparison of seed production of R. rugosa between invasive and declining populations. We compared seed production in invasive expanding populations in NW Europe and in the native declining populations of China, and discussedpossible factors driving the differences between regions.