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首页> 外文期刊>Water, Air, and Soil Pollution >Access to Natural Substrates in Urban Streams Does Not Counter Impoverishment of Macroinvertebrate Communities: a Comparison of Engineered and Non-engineered Reaches
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Access to Natural Substrates in Urban Streams Does Not Counter Impoverishment of Macroinvertebrate Communities: a Comparison of Engineered and Non-engineered Reaches

机译：在城市河流中接触自然底物并不能消除大型无脊椎动物社区的贫困：工程和非工程范围的比较

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Urban streams are degraded through multiple mechanisms, including severely altered flow regimes, elevated concentrations of waterborne contaminants, removal of riparian vegetation and the loss of a mosaic of heterogeneous aquatic habitats. Engineering of urban stream reaches using concrete is a widespread and extreme case of deliberate alteration of flow regimes and concomitant habitat simplification. To assess the effect of such engineering practices on stream ecosystems, we compared aquatic macroinvertebrate communities from concrete-lined engineered urban reaches, non-engineered urban reaches with natural substrates and reference reaches flowing through minimally disturbed forested subcatchments and with natural substrates, in the Sydney metropolitan region, Australia. The communities from all urban reaches were impoverished and distinctly different from more diverse communities in forested reference reaches. Despite low aquatic habitat heterogeneity, engineered urban reaches had very high abundances of Diptera and some other tolerant taxa. Diptera and/or Gastropoda were dominant in non-engineered urban reaches. Multivariate community structures were dissimilar between the urban reaches and forested reference reaches and between non-engineered and engineered urban reaches. However, the low family-level richness and SIGNAL scores in both urban reach types indicated they were severely ecological impaired, whether engineered or not. Most macroinvertebrate taxa in the regional pool that were hardy enough to inhabit urban reaches with natural substrates were also present in nearby concreted reaches. The results add weight to the growing evidence that in urban landscapes, regional-scale changes in water quality and flow regimes limit the establishment of diverse macroinvertebrate communities, which cannot be addressed through the provision of increased reach-scale habitat heterogeneity.
机译：城市水流通过多种机制退化，包括严重改变的水流状态，升高的水污染物浓度，河岸植被的清除以及非均质水生生境的镶嵌丧失。使用混凝土对城市河流进行工程设计是一种广泛而极端的案例，故意改变了水流状况并简化了生境。为了评估此类工程实践对河流生态系统的影响，我们在悉尼比较了混凝土衬砌的工程化城市河段，非工程化城市河段和自然底物以及参考河道的水生大型无脊椎动物群落，这些参考河道流经最小扰动的森林次集水区和自然底物大都会地区，澳大利亚。所有城市地区的社区都处于贫困状态，与森林参考地区的多样性社区截然不同。尽管水生生境的异质性较低，但工程化的城市河段却有很高的双翅目和其他一些耐性类群。双足类和/或腹足纲动物在非工程化的城市河段中占主导地位。在城市范围和森林参考范围之间以及在非工程和工程城市范围之间，多元社区结构是不同的。但是，在两种城市覆盖类型中，家庭水平的丰富度和SIGNAL得分均较低，这表明无论是否经过工程设计，它们都严重损害了生态。在附近的混凝土河段中，也存在区域池中大多数足以无力居住在自然界中的城市河床的大型无脊椎动物类群。结果增加了越来越多的证据的重要性，这些证据表明，在城市景观中，区域尺度的水质和水流变化限制了多样性无脊椎动物群落的建立，而这不能通过提供范围扩大的生境异质性来解决。

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