Large wood is a key component of river channels that affects numerous hydrological, physical and geomorphological processes. It promotes a diversity of benthic habitats in-channel and has shown to support more abundant and diverse benthic macroinvertebrate assemblages in previous ecological studies. However, the effects of large wood on the structural and functional diversities of hyporheic invertebrates are less well studied, and simultaneous examination of these diversity metrics on hyporheic and benthic compartments of the stream bed has not been conducted previously. Therefore, this study investigates the taxonomic and functional diversities of hyporheic and benthic invertebrate assemblages around natural accumulations of large wood in a British lowland river. Taxonomic and functional diversities were partitioned (into alpha, beta, and gamma diversities) and examined in reaches with and without large wood (control). We found that functional diversity is often decoupled from taxonomic diversity, demonstrating a functional redundancy of the macroinvertebrate assemblage for both hyporheic and benthic zones. Moreover, the highest functional variability at alpha-scale was observed in large wood habitats, which suggests that taxonomic diversity is enhanced by the small-scale environmental heterogeneity around large wood. To this end, this study contributes empirical evidence of functional and structural responses of invertebrates to large wood accumulation. Such information could be used to better understand the ecological implications of restoration works in lowland rivers and guide more effective management strategies.

中文翻译：

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调查大木材周围的无脊椎动物生物多样性：分类与功能指标

大木头是河道的重要组成部分，会影响许多水文、物理和地貌过程。它促进了河道内底栖栖息地的多样性，并在以前的生态研究中显示出支持更丰富和多样化的底栖大型无脊椎动物组合。然而，大木头对下流无脊椎动物的结构和功能多样性的影响研究较少，而且以前没有对这些多样性指标对河床下流和底栖隔间进行同时检查。因此，本研究调查了英国低地河流中大木头自然堆积物周围的潜流和底栖无脊椎动物组合的分类学和功能多样性。分类和功能多样性被划分（分为 alpha、beta、和伽马多样性）并在有和没有大木材（对照）的河段进行检查。我们发现功能多样性通常与分类多样性脱钩，表明大型无脊椎动物组合在潜流区和底栖区都有功能冗余。此外，在大型木材栖息地中观察到 alpha 尺度的最高功能变异性，这表明大型木材周围的小规模环境异质性增强了分类多样性。为此，本研究提供了无脊椎动物对大量木材积累的功能和结构反应的经验证据。此类信息可用于更好地了解低地河流修复工程的生态影响，并指导更有效的管理策略。