We investigated the odonates of Wadi Cherf, a tributary of Wadi Seybouse, and explored the main environmental factors that may be important drivers of the abundance and diversity of Odonata assemblages. PCA analyses demonstrated a significant altitudinal gradient associated with water flow, temperature, vegetation cover, substrate and adjacent land use. Notably, pollution was a dominant structuring factor and the most widespread species, Ischnura graellsii and the North African endemic Platycnemis subdilatata, were the most pollution-tolerant species. Similarly, co-inertia analysis indicated that environmental factors could account for 70% of the co-variation in shaping odonate assemblages. Equally important, threatened species were associated with less degraded but vulnerable habitats, most susceptible to anthropogenic impacts. There is thus a need to develop monitoring tools to assess the ecological integrity of North African rivers and implement a management plan that considers both connectivity and heterogeneity to ensure that Wadi Cherf, a sanctuary to three threatened species Calopteryx exul (EN), Coenagrion mercuriale (EN) and Gomphus lucasii (VU), continues to provide critical ecosystem functions.

中文翻译：

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阿尔及利亚东北部 Wadi Cherf 地中海河流的齿状藻类群落的生态相关性：对保护的影响

我们调查了 Wadi Seybouse 的支流 Wadi Cherf 的齿状藻类，并探索了可能是 Odonata 组合丰富度和多样性的重要驱动因素的主要环境因素。PCA 分析表明，与水流、温度、植被覆盖、基质和相邻土地利用相关的显着海拔梯度。值得注意的是，污染是主要的结构因素，分布最广的物种 Ischnura graellsii 和北非特有的 Platycnemis subdilatata 是最耐污染的物种。类似地，共惯性分析表明，环境因素可以解释 70% 的形成齿状化合物组合的协变。同样重要的是，受威胁物种与退化程度较低但脆弱的栖息地有关，最容易受到人为影响。