Plant invasions can modify the composition of native communities through altering diversity and ecosystem functioning. For example, arthropod communities can be influenced by the introduction of invasive plant species, but the impacts of plant invasions on arthropod communities have received little attention. Here, we investigated the diversity and species composition of arthropods in areas with and without invasive plants by comparing native ecosystems and areas invaded by Acacia dealbata, A. longifolia and A. melanoxylon in 18 locations in the northwestern Iberian Peninsula. Yellow sticky traps were placed in branches above ground in randomly selected areas and used to qualify and quantify the number of aerial arthropods. The aim was to assess the impact of invasive Acacia on arthropod species in different ecosystems. Our results demonstrate that arthropods are negatively influenced by Acacia invasions, reducing the abundance and diversity in invaded areas, which had substantial effects on beta-diversity and trophic levels. Overall, our findings indicate that invasive acacias can alter the species composition by not only reducing abundance and diversity but also altering the different trophic groups of the arthropod assemblages. The physical dominance of Acacia invaders alters the co-occurrence of arthropod assemblages, reducing the number of groups and leading to substantial effects on ecosystem dynamics as well as in the trophic diversity. We suggest implementing management strategies to favour the protection of native ecosystems and reduce the impacts of these exotic plants on arthropod biodiversity at the habitat level.

中文翻译：

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描绘澳大利亚相思树入侵地区的节肢动物群落和营养多样性

植物入侵可以通过改变多样性和生态系统功能来改变土著社区的组成。例如，节肢动物群落可能受到入侵植物物种的引进的影响，但是植物入侵对节肢动物群落的影响却很少受到关注。在这里，我们通过比较原生生态系统和被阿拉伯相思树，长叶假单胞菌和黑变种A. melanoxylon入侵的区域，研究了有无入侵植物的节肢动物的多样性和物种组成。在伊比利亚西北半岛的18个地点。将黄色粘性陷阱放置在随机选择区域中地面以上的分支中，用于鉴定和定量空中节肢动物的数量。目的是评估入侵相思对不同生态系统中节肢动物物种的影响。我们的研究结果表明，节肢动物受到相思树入侵的负面影响，从而减少了入侵地区的丰富度和多样性，这对β多样性和营养水平产生了重大影响。总体而言，我们的研究结果表明，侵入性洋槐不仅可以减少丰度和多样性，而且可以改变节肢动物组合的不同营养类别，从而可以改变物种组成。相思的物理优势入侵者改变了节肢动物种群的共生关系，减少了种群数量，并对生态系统动态以及营养多样性产生了重大影响。我们建议实施管理策略，以保护本地生态系统并在栖息地一级减少这些外来植物对节肢动物生物多样性的影响。