Restoring aquatic ecosystems is still at an early stage and the outcomes of the remediation techniques used are often not reported, which limit opportunities to learn and further improve these methods. One common remediation technique in urban areas is daylighting, which involves the re-opening of once buried streams with the aim of restoring ecosystem functions and services. In this study, we monitored the colonization of two important aquatic communities, benthic algae and macroinvertebrates, and assessed the nutrient retention capacity of a recently daylighted urban stream in the city of Oslo, Norway. The approach used involved transforming a buried channel into an open stream consisting of interconnected riffles and ponds seeded with aquatic and terrestrial plants. Benthic algal and macroinvertebrate communities begun to colonize the restored stretch within a relatively short time, 9 months following daylighting. The dynamics of the two aquatic communities differed, indicating that spatial processes are influential in determining the establishment of benthic algae, whereas time is more important for macroinvertebrate communities. The observed net nutrient retention from the daylighted stretch for phosphate, total nitrogen, total phosphorus, and calcium were 226, 128, 38 and 14%, respectively. However, the efficiency of the daylighted stretch to sequester nutrients was limited by the lack of controlling nutrient inputs from diffuse sources. This highlights the importance of addressing the influence of broader-scale processes, extending beyond the boundaries of the restored reach, which can otherwise demise the success of daylighting.

中文翻译：

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日光后城市溪流中水生群落的快速定植

恢复水生生态系统仍处于早期阶段，所使用的修复技术的结果往往没有报告，这限制了学习和进一步改进这些方法的机会。城市地区一种常见的修复技术是采光，它涉及重新开放曾经被掩埋的溪流，目的是恢复生态系统功能和服务。在这项研究中，我们监测了两个重要水生群落（底栖藻类和大型无脊椎动物）的定殖，并评估了挪威奥斯陆市最近日光充足的城市河流的养分保留能力。所使用的方法包括将一个埋藏的河道改造成一条开放的溪流，该溪流由相互连接的浅滩和种植有水生和陆生植物的池塘组成。底栖藻类和大型无脊椎动物群落在相对较短的时间内，即日光照射后 9 个月内，开始在恢复的区域定殖。两个水生群落的动态不同，表明空间过程对确定底栖藻类的建立有影响，而时间对大型无脊椎动物群落更为重要。从采光路段观察到的磷酸盐、总氮、总磷和钙的净养分保留率分别为 226%、128%、38% 和 14%。然而，由于缺乏控制来自扩散源的养分输入，采光路段隔离养分的效率受到限制。这突出了解决更广泛过程影响的重要性，这些过程超出了恢复范围的边界，