Effects of urban spatial and temporal heterogeneity on benthic macroinvertebrate and diatom communities [Effects of urban spatial and temporal heterogeneity on benthic macroinvertebrate and diatom communities]
Effects of urban spatial and temporal heterogeneity on benthic macroinvertebrate and diatom communities [Effects of urban spatial and temporal heterogeneity on benthic macroinvertebrate and diatom communities]
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城市时空异质性对底栖大型无脊椎动物和硅藻群落的影响[城市时空异质性对底栖大型无脊椎动物和硅藻群落的影响]
DOI：
10.1127/fal/2022/1481
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发表时间：
2022
影响因子：
1
通讯作者：
Palenscar, Kai T.
中科院分区：
文献类型：
--
作者：
Saffarinia, Parsa;Anderson, Kurt E.;Palenscar, Kai T.
城市流域河流的水质、分布和流量经常发生很大的变化，使环境中的水生群落具有新的时空异质性。理解新的空间和时间异质性如何影响水生群落是至关重要的，因为这些分类群是城市食物网的基础。在这项研究中，我们记录了水流扰动对底栖大型无脊椎动物和硅藻群落的影响，与污水处理厂的出水有关，位于美国南加州的一条城市化河流的样带。特别是，我们分析了硅藻和底栖大型无脊椎动物群落的丰富度和密度与污水处理厂和城市暴雨径流事件引入的新的水流非均质性相关的趋势。我们发现，硅藻密度在干扰后有所下降，但很快恢复到干扰前的水平，而底栖大型无脊椎动物群落在干扰后的组成和密度变化很小，但以耐受为主的类群丰富度较低。污水处理厂的出水位置对两个群落的密度和丰富度都有持续的负面影响。这些结果对保护城市圣安娜河里濒临灭绝的鱼类物种具有重要意义，这些物种依赖蓬勃发展的基本食物网生存。
Water quality, distribution, and flow are often highly altered in rivers in urban watersheds, subjecting aquatic communities in the environment to novel spatial and temporal heterogeneity. An understanding of how novel spatial and temporal heterogeneity impacts aquatic communities is of paramount concern since these taxa are foundational to the urban food web. In this study, we documented the effects of flow perturbations on benthic macroinvertebrate and diatom communities relative to wastewater treatment plant outflows in a transect of an urbanized river in Southern California, USA. In particular, we analyzed trends in the richness and density of diatom and benthic macroinvertebrate communities in relation to novel flow heterogeneity introduced by wastewater treatment plants and urban storm runoff events. We found that diatom density decreased after a disturbance but quickly returned to its pre-disturbance levels, while the benthic macroinvertebrate community showed minimal shifts in composition and density after the disturbance, yet the sites had low richness of predominantly tolerant taxa. The locations of wastewater treatment plant outflows were found to exert a constant negative effect on density and richness in both communities. These results have implications for the conservation of endangered fish species in the urban Santa Ana River that depend on a thriving basal food web for survival.