ABSTRACT The distribution of aquatic insects is influenced by several environmental features, especially water quality and substrate. Diversity and distribution of the aquatic community and the distribution of the feeding functional groups (FFGs) of Ephemeroptera, Plecoptera and Trichoptera (EPT) in four microhabitats from low-order streams on a subtropical island were analyzed. Samples were taken with a Surber sampler and environmental descriptors – water temperature (°C), dissolved oxygen (mg/L−1), electrical conductivity (µS.cm−1), depth (cm) and organic matter – were recorded. The distribution of EPT genera was analyzed by a Canonical Analysis of Principal Coordinates, and the relationship of EPT genera and FFGs with the microhabitats was studied using Indicators Species Analysis. Environmental features were analyzed using Redundancy Analysis and BIO-ENV. Results showed that the EPT community structure and FFGs differed between microhabitats in summer and winter, and their occurrence was associated with physical structure habitat and water quality. During the winter, there was a greater abundance of EPT genera, and the community was clearly distinguished among the four microhabitats. Moreover, there was an association of specific genera with particular substrates along the streams. The present study indicated that habitat structure is an important determinant of the EPT composition insects in subtropical streams.

中文翻译：

---

微生境对亚热带森林溪流中蜉蝣、鳞翅目和毛翅目多样性和分布的影响

摘要 水生昆虫的分布受多种环境特征的影响，尤其是水质和基质。分析了亚热带岛屿低阶溪流的四个微生境中，蜉蝣目、蚱蜢和毛翅目（EPT）的水生群落的多样性和分布以及取食功能群（FFG）的分布。使用 Surber 采样器采集样品并记录环境描述符——水温 (°C)、溶解氧 (mg/L−1)、电导率 (µS.cm−1)、深度 (cm) 和有机物。EPT属的分布通过主坐标典型分析进行分析，EPT属和FFGs与微生境的关系采用指标物种分析进行研究。使用冗余分析和 BIO-ENV 分析环境特征。结果表明，夏季和冬季微生境的EPT群落结构和FFGs存在差异，其发生与生境物理结构和水质有关。在冬季，EPT 属的数量更加丰富，并且在四种微生境中可以清楚地区分群落。此外，沿溪流存在特定属与特定底物的关联。目前的研究表明，栖息地结构是亚热带河流中昆虫 EPT 组成的重要决定因素。在冬季，EPT 属的数量更加丰富，并且在四种微生境中可以清楚地区分群落。此外，沿溪流存在特定属与特定底物的关联。目前的研究表明，栖息地结构是亚热带河流中昆虫 EPT 组成的重要决定因素。在冬季，EPT 属的数量更加丰富，并且在四种微生境中可以清楚地区分群落。此外，沿溪流存在特定属与特定底物的关联。目前的研究表明，栖息地结构是亚热带河流中昆虫 EPT 组成的重要决定因素。