Data from: Hierarchical multi-taxa models inform riparian vs. hydrologic restoration of urban streams in a permeable landscape

The degradation of streams caused by urbanization tends to follow predictable patterns; however, there is a growing appreciation for heterogeneity in stream response to urbanization due to the local geoclimatic context. Furthermore, there is building evidence that streams in mildly sloped, permeable landscapes respond uncharacteristically to urban stress calling for a more nuanced approach to restoration. We evaluated the relative influence of local-scale riparian characteristics and catchment-scale imperviousness on the macroinvertebrate assemblages of streams in the flat, permeable urban landscape of Perth, Western Australia. Using a hierarchical multi-taxa model, we predicted the outcomes of stylized stream restoration strategies to increase the riparian integrity at the local scale or decrease the influences of imperviousness at the catchment scale. In the urban streams of Perth, we show that local-scale riparian restoration can influence the structure of macroinvertebrate assemblages to a greater degree than managing the influences of catchment-scale imperviousness. We also observed an interaction between the effect of riparian integrity and imperviousness such that the effect of increased riparian integrity was enhanced at lower levels of catchment imperviousness. This study represents one of few conducted in flat, permeable landscapes and the first aimed at informing urban stream restoration in Perth, adding to the growing appreciation for heterogeneity of the Urban Stream Syndrome and its importance for urban stream restoration.城市化引发的河流退化通常遵循可预测的模式；然而，受局地地质气候背景影响，人们愈发认识到河流对城市化的响应存在异质性。此外，越来越多的证据表明，坡度平缓、渗透性景观中的河流对城市胁迫的响应呈现非典型特征，这要求采用更为精细的河流修复方案。本研究以澳大利亚西部珀斯市平坦且具渗透性的城市河流景观为研究对象，评估了局地尺度河岸带特征与集水区尺度不透水面对河流大型无脊椎动物群落（macroinvertebrate assemblages）的相对影响。本研究采用分层多类群模型（hierarchical multi-taxa model），模拟了两种程式化河流修复策略的实施效果：一是提升局地尺度河岸带完整性，二是降低集水区尺度不透水面的影响。针对珀斯城市河流的研究结果显示，局地尺度河岸带修复对大型无脊椎动物群落结构的影响程度，大于管控集水区尺度不透水面所带来的效果。本研究还发现，河岸带完整性与不透水面的影响存在交互作用：当集水区不透水面占比处于较低水平时，提升河岸带完整性的修复效果会得到增强。本研究是针对平坦渗透性景观开展的同类研究中为数不多的一项，同时也是首个旨在为珀斯城市河流修复提供指导的相关研究，进一步深化了人们对城市河流综合征（Urban Stream Syndrome）异质性及其对城市河流修复重要性的认知。