Reproductive interference can lead to the exclusive distribution of species. Reports on reproductive interference between alien species are scarce, although alien species are becoming more abundant and evaluations of the interference between aliens and its influence on community structure are essential. We therefore investigated the presence of interference in two alien species of Veronica, V. cymbalaria and V. persica. Hand-pollination experiments revealed that heterospecific pollen adversely affected both species, but asymmetrically: in V. cymbalaria, it reduced the number of seeds both before and after conspecific pollination, but in V. persica it reduced the number of seeds only when it occurred before conspecific pollination. Field observation suggested that the number of seeds produced by V. cymbalaria was more influenced by the number of conspecific flowers than by the frequency of surrounding V. persica flowers. Pot experiments did not show a negative effect of heterospecific individuals on the reproductive success of focal species in either species. Observations of visiting pollinators revealed no pollinator preference between the plant species. Although we demonstrated asymmetrical reproductive interference between V. cymbalaria and V. persica, its effect in the field seemed limited. An essential factor mitigating the adverse effect of reproductive interference might be a shortage of pollinators that could facilitate interspecific pollination. We predict that further invasion of V. cymbalaria into areas where V. persica prevails is unlikely, although swift displacement of V. cymbalaria by V. persica in areas where V. cymbalaria is already established is also unlikely.

生殖干扰可能导致物种的排他性分布。尽管外来物种越来越丰富，但对外来物种之间的生殖干扰的报道却很少，对外来物种之间的干扰及其对群落结构的影响的评估至关重要。因此，我们调查了两种外来物种 Veronica、V 是否存在干扰。 cymbalaria 和 V。桃。手工授粉实验表明，异种花粉对两个物种都有不利影响，但影响不对称：V。 cymbalaria，同种授粉前后的种子数量均减少，但在V. persica 仅当发生在同种授粉之前时，它才会减少种子数量。实地观察表明，V 产生的种子数量。 cymbalaria 受同种花数量的影响大于周围 V 频率的影响。桃花花。盆栽实验并未显示异种个体对任一物种中焦点物种的繁殖成功率产生负面影响。对来访传粉者的观察表明，植物物种之间没有授粉者偏好。尽管我们证明了 V 之间存在不对称的生殖干扰。 cymbalaria 和 V。 persica，其在该领域的作用似乎有限。减轻生殖干扰不利影响的一个重要因素可能是缺乏促进种间授粉的传粉媒介。我们预测V将进一步入侵。 cymbalaria 进入 V 的区域。尽管 V 会迅速取代，但 persica 不太可能占上风。 cymbalaria，作者：V。 persica 位于 V. 的地区。 cymbalaria已经成立的可能性也很小。