Multiple invaders usually co-occur in an ecosystem and threaten the ecological safety of ecosystems. Invasive species from the same origin could facilitate each other’s establishment, while some species could suppress invasion from others with similar traits. For the successful management of aquatic ecosystems invaded by multiple invasive species, we need to better understand the interaction between multiple common-origin invasive aquatic plants and native aquatic plants with similar traits in a community. A native species, Ludwigia peploides, and two invasive species from the same origin, Myriophyllum aquaticum and Alternanthera philoxeroides were grown as a monoculture (no competitor) or a mixed culture (with competitor) to determine the interactions between the species. The biomass, morphological and photosynthetic physiological traits were measured. The results showed that the biomass traits, relative growth rate and morphological traits (except specific leaf area) of L. peploides were higher than those of the two invasive species. Additionally, L. peploides had significantly higher photosynthetic physiological traits than those of M. aquaticum (in all treatments) and A. philoxeroides (in monoculture). The mixed-culture treatments had relatively less effect on most of the growth traits of L. peploides. However, most of the mixed-culture treatments prominently reduced the biomass, morphological traits and photosynthetic physiological traits of the two invasive species. In addition, the native species had a greater competitive effect than both invaders. Overall, co-invasion between the two invaders was not observed. Furthermore, these results support that highly competitive native species could reduce the growth and the invasive success of less competitive invasive species with similar traits in communities.

通常在一个生态系统中同时发生多个入侵者，并威胁到生态系统的生态安全。来自同一起源的入侵物种可以促进彼此的建立，而某些物种可以抑制来自具有相似性状的其他物种的入侵。为了成功管理被多种入侵物种入侵的水生生态系统，我们需要更好地理解社区中多种常见起源的入侵水生植物与具有相似性状的本土水生植物之间的相互作用。一个本地物种，Ludwigia peploides，以及两个来自相同起源的入侵物种，Myriophyllum aquaticum和Alternanthera philoxeroides以单一养殖（无竞争者）或混合养殖（有竞争者）的方式生长，以确定物种之间的相互作用。测量了生物量，形态和光合生理特性。结果表明，生物量性状，相对生长率和形态特征（除了特定叶面积）L. peploides较两个入侵物种更高。此外，peploides的光合生理特性明显高于水生M.（在所有处理中）和A. philoxeroides（在单培养中）。混合培养处理对peploides的大多数生长特性的影响相对较小。然而，大多数混合培养处理显着降低了两种入侵物种的生物量，形态特征和光合生理特征。此外，本地物种比两个入侵者都具有更大的竞争效果。总体而言，未观察到两个入侵者之间的共同入侵。此外，这些结果支持竞争激烈的本地物种可能会降低社区中具有相似性状的竞争性较低的入侵物种的生长和入侵成功。