Temporary streams are dynamic ecosystems that shift between wet and dry states and include the ‘winterbourne’ chalk streams of south England. Our understanding of temporary stream biodiversity is biased, with most research to date exploring aquatic invertebrate communities in benthic sediments during flowing phases. We surveyed the invertebrate communities of the Candover Brook chalk stream, comparing aquatic (benthic, hyporheic) and terrestrial communities in reaches with different flow permanence regimes. We used kick and Bou–Rouch sampling methods to collect aquatic invertebrates, and compared the terrestrial communities characterised by pitfall traps and ground searches and in different seasons. Although aquatic taxa richness was lower in temporary compared to perennial reaches, the total biodiversity of temporary stream channels was enhanced by contributions from both aquatic and terrestrial species, including several of conservation interest. We recommend that both aquatic and terrestrial communities should be considered in research and monitoring to characterise the biodiversity and ecological quality of temporary streams.

中文翻译：

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水生和陆生无脊椎动物群落对白垩流干燥的反应

临时溪流是动态的生态系统，在干湿状态之间转换，包括英格兰南部的“winterbourne”白垩溪流。我们对临时河流生物多样性的理解是有偏见的，迄今为止的大多数研究都是在流动阶段探索底栖沉积物中的水生无脊椎动物群落。我们调查了 Candover Brook 白垩流的无脊椎动物群落，比较了具有不同流动持久性机制的河段中的水生（底栖、潜流）和陆生群落。我们使用kick 和Bou-Rouch 采样方法收集水生无脊椎动物，并比较了以陷阱陷阱和地面搜索为特征的不同季节的陆地群落。尽管与多年生河段相比，水生类群的丰富度暂时较低，水生和陆生物种的贡献增强了临时河道的总体生物多样性，其中包括一些具有保护意义的物种。我们建议在研究和监测中应同时考虑水生和陆地群落，以表征临时河流的生物多样性和生态质量。