Biological communities are subject to spatiotemporal variations in community structure, i.e., species composition, richness, and abundance. Plant–pollinator interactions are affected by species composition and abundance, so that rapid changes in plant community structure can lead to critical impacts on plant–pollinator interactions at the community level. The extent of these impacts depends on how plants respond to different kinds of stressors, such as the disturbance caused by invading species. In this research, we conducted a before-and-after study to evaluate the potential effects of an invasive fast-growing alien grass species on the structure of a plant–pollinator interaction network. We described the changes in community structure and plant–pollinator interactions over two sampling periods, through the temporal β-diversity of plant and bee species, plant–bee interactions, and plant functional traits. Our results showed that changes in plant community composition (especially the plants in the network core) and decrease in plant species richness, as well as in floral resources availability impacted plant–pollinator interactions of a grassland community after the growth of a fast-growing alien grass species. These changes were accompanied by a decrease in plant–bee interaction diversity, and a high β-diversity of species interactions mainly due to interaction rewiring. However, we found no effect on the functional diversity of flowers. In conclusion, our study showed that a short-term change in plant species composition and floral resource abundance impacted plant–bee interactions, which markedly changed network structure and dynamics.

中文翻译：

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植物群落结构的变化和花卉资源可用性的降低导致植物与蜜蜂相互作用的高时间β多样性

生物群落的群落结构（即物种组成，丰富度和丰度）会发生时空变化。植物与授粉媒介之间的相互作用受物种组成和丰度的影响，因此植物群落结构的快速变化会在社区一级对植物与授粉媒介之间的相互作用产生重大影响。这些影响的程度取决于植物对不同种类胁迫源的反应方式，例如入侵物种造成的干扰。在这项研究中，我们进行了一项前后研究，以评估入侵性快速生长的外来草种对植物-授粉媒介相互作用网络结构的潜在影响。我们通过时间β描述了两个采样周期内群落结构和植物-授粉媒介相互作用的变化。-植物和蜂种的多样性，植物与蜜蜂的相互作用以及植物功能性状。我们的结果表明，植物群落组成的变化（尤其是网络核心中的植物）和植物物种丰富度的下降以及花卉资源的可获得性影响了快速生长的外星人生长后草原群落的植物-授粉媒介相互作用。草种。这些变化伴随着植物与蜜蜂相互作用多样性的降低，以及高的β值。-物种相互作用的多样性主要是由于相互作用重新布线。然而，我们发现对花的功能多样性没有影响。总之，我们的研究表明，植物物种组成和花卉资源丰度的短期变化会影响植物与蜜蜂的相互作用，从而显着改变网络结构和动力学。