Biometric Research, Fremantle, Western Australia, Australia.
Centre of Excellence in Natural Resource Management, University of Western Australia, PO Box 5771, Albany, Western Australia, Australia.
Ecol Appl. 2018 Mar;28(2):385-397. doi: 10.1002/eap.1654. Epub 2018 Jan 23.
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.
城市化导致的溪流退化往往遵循可预测的模式；然而，由于当地的地理气候背景，溪流对城市化的响应存在越来越大的异质性。此外，有证据表明，在坡度较缓、渗透性较强的景观中，溪流对城市压力的反应异常，这需要一种更细致入微的恢复方法。我们评估了当地尺度的河岸带特征和流域尺度的不透水率对澳大利亚珀斯平坦、渗透性城市景观中溪流大型无脊椎动物群落的相对影响。使用分层多分类群模型，我们预测了典型溪流恢复策略的结果，以增加当地尺度的河岸带完整性或减少流域尺度不透水率的影响。在珀斯的城市溪流中，我们表明，与管理流域尺度不透水率的影响相比，局部尺度的河岸带恢复可以更大程度地影响大型无脊椎动物群落的结构。我们还观察到河岸带完整性和不透水率之间的相互作用，即增加河岸带完整性的效果在流域不透水率较低的情况下增强。这项研究代表了在平坦、渗透性景观中进行的为数不多的研究之一，也是首次旨在为珀斯的城市溪流恢复提供信息，增加了对城市溪流综合征异质性及其对城市溪流恢复重要性的认识。
