The arthropod fauna associated with seven endemic dendroid Euphorbia was sampled and studied in the Canary and Madeira archipelagos. The stem-diameter of the plants was considered, along with their genetic affinity, habitat and number of localities and islands where present. The arthropod assemblages and richness found on each Euphorbia species were statistically analysed, to determine which variables influenced the survey results. A total of 179 arthropod species were found, identified, and classified into characteristic or accompanying fauna, according to their relationship with the plants and their types of diet. Faunal assemblages and arthropod species richness differed among the Euphorbia species, each thus showing a strong and almost unique host relationship. Species richness increased with the architectural complexity of the host-plant species and number of localities and islands where present. The similarity of faunal assemblages was mainly related to stem diameter. Among diet types, a great number of exclusive and/or endemic taxa associated with this plant genus were xylophages. Our survey revealed that rich arthropod communities are associated with the genus Euphorbia, especially on its rare endangered species, and highlights the need to protect their host plants. This in turn will contribute to the conservation of their arthropod communities and their ecosystem functions.

中文翻译：

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受威胁寄主植物对节肢动物多样性的重要性：与加那利群岛和马德拉群岛特有的树状大戟属植物相关的动物群

在加那利群岛和马德拉群岛对与七种地方树状大戟属相关的节肢动物群进行采样和研究。考虑了植物的茎直径，以及它们的遗传亲和力、栖息地以及存在的地点和岛屿的数量。对在每个大戟属物种上发现的节肢动物组合和丰富度进行了统计分析，以确定哪些变量影响了调查结果。总共发现、鉴定了 179 种节肢动物，并根据它们与植物的关系及其饮食类型将其归类为特征或伴随动物群。大戟属物种之间的动物群组合和节肢动物物种丰富度不同，因此每种都表现出强烈且几乎独特的寄主关系。物种丰富度随着寄主植物物种的建筑复杂性以及存在的地方和岛屿的数量而增加。动物群落的相似性主要与茎粗有关。在饮食类型中，与该植物属相关的大量独特和/或地方性分类群是木噬菌体。我们的调查显示，丰富的节肢动物群落与大戟属有关，尤其是其稀有濒危物种，并强调了保护寄主植物的必要性。这反过来将有助于保护其节肢动物群落及其生态系统功能。与该植物属相关的大量独特和/或地方性分类群是木噬菌体。我们的调查显示，丰富的节肢动物群落与大戟属有关，尤其是其稀有濒危物种，并强调了保护寄主植物的必要性。这反过来将有助于保护其节肢动物群落及其生态系统功能。与该植物属相关的大量独特和/或地方性分类群是木噬菌体。我们的调查显示，丰富的节肢动物群落与大戟属有关，尤其是其稀有濒危物种，并强调了保护寄主植物的必要性。这反过来将有助于保护其节肢动物群落及其生态系统功能。