Biological monitoring requires a comprehensive baseline of assemblage distribution patterns and their environmental drivers. In this study we evaluated benthic macroinvertebrates in a regulated river, located in a semi-arid region, which has a seasonal flood pulse and is affected by several anthropogenic pressures. Taxonomic and trophic structures of benthic macroinvertebrate assemblages were analysed in terms of their longitudinal distribution, hydrological regime and environmental factors, including the effects of hydromorphology, riparian land use and water abstraction. Most taxa were generalists and classified in the collector–gatherer functional feeding group. A large taxonomic replacement was associated with hydromorphological characteristics. Local environmental variables were critical for macroinvertebrate assemblages. There was significant temporal variability regarding seasonal flood pulse. Water abstraction for irrigation had a strong effect on assemblage structure. We suggest some challenges and issues for successful implementation of biomonitoring tools in the Dulce River, related primarily to high spatiotemporal variability.

中文翻译：

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受调节的半干旱河流中底栖大型无脊椎动物群落的结构、分布模式和对水文变化的生态响应：生物监测研究的基线

生物监测需要一个关于组合分布模式及其环境驱动因素的综合基线。在这项研究中，我们评估了位于半干旱地区的受管制河流中的底栖大型无脊椎动物，该河流具有季节性洪水脉冲，并受到多种人为压力的影响。从纵向分布、水文状况和环境因素（包括水文形态、河岸土地利用和取水的影响）方面分析了底栖大型无脊椎动物组合的分类和营养结构。大多数分类群是通才，并归入收集器 - 收集器功能摄食组。一个大的分类替代与水形态学特征相关。局部环境变量对于大型无脊椎动物组合至关重要。季节性洪水脉冲存在显着的时间变化。灌溉取水对组合结构有很强的影响。我们提出了在杜尔塞河成功实施生物监测工具的一些挑战和问题，主要与高时空变异性有关。