Exotic species have invaded freshwater ecosystems, causing biodiversity loss of associated communities. We investigated the influence of the invasive macrophyte Hydrilla verticillata on taxonomic and functional richness, and on taxonomic and functional beta diversity of associated Chironomidae community, comparing this macrophyte with the structurally similar native macrophyte, Egeria najas. We conducted a field experiment where the native and invasive plants were kept side-by-side and colonized by invertebrates. We used accumulation curves to test if richness differed between macrophytes. We used multivariate dispersion to investigate whether taxonomic and functional composition differed between both macrophytes and to test if beta diversity was higher among individuals of the native than among individuals of the invasive macrophytes. We measured beta diversity values as an average distance of the compositions to the centroid in a multidimensional space (taxonomic and functional) given by a Principal Coordinates Analysis. We found similar taxonomic richness and similar taxonomic and functional Chironomidae composition between macrophytes. However, functional richness as well as taxonomic and functional beta diversity of Chironomidae were higher among the native than among the invasive macrophytes. Thus, although H. verticillata did not cause changes neither in Chironomidae taxonomic richness nor on taxonomic and functional composition, its spread may drive the simplification of species and functional traits of associated Chironomidae communities.

外来物种入侵了淡水生态系统，导致相关社区的生物多样性丧失。我们调查了侵袭性大型植物Hydrilla verticillata对分类和功能丰富度以及相关Chironomidae群落的分类和功能β多样性的影响，将该大型植物与结构相似的天然大型植物Egeria najas进行了比较。我们进行了田间试验，其中本土植物和入侵植物并排放置并被无脊椎动物定殖。我们使用累积曲线来测试大型植物之间的丰富度是否不同。我们使用多元离散度研究了两个大型植物之间的分类学和功能组成是否不同，并测试了本地个体中的β多样性是否高于侵入性大型植物中的个体。我们通过主坐标分析给出了在多维空间（分类和功能）中组合物到质心的平均距离的β多样性值。我们发现大型植物之间具有相似的分类学丰富度和相似的分类学和功能性猫科。然而，Chironomidae的功能丰富度以及分类学和功能性β多样性在本地物种中比在入侵大型植物中更高。因此，尽管verticalillata既没有引起Chironomidae分类学丰富度的变化，也没有引起分类学和功能组成的变化，它的传播可能会导致相关Chironomidae群落的物种和功能性状的简化。