Stormwater retention ponds receive a variety of urban and highway pollutants that may have adverse effects on water-dwelling organisms. In this exploratory study, the benthic diatom community composition at genus level of nine such ponds servicing highway, residential, industrial, and mixed industrial/residential catchments was examined. Thirteen biocides were measured in the pond water as one of the possible explanatory factors for diatom taxonomic variability. The uppermost 1 cm of sediment was sampled, and a total of 50 diatom genera were identified. Moderate to high similarities were found among the diatom communities of the ponds. Two genera, namely Navicula and Nitzschia, were the most abundant and accounted for 19–47% of the relative abundance in the ponds. Estimated relative abundances of diatom genera and measured biocide concentrations in the ponds were grouped according to land use. Highway ponds were found to be significantly different from ponds servicing residential and industrial catchments, while no significant differences were found between residential and industrial ponds. The presence of biocides alone could not explain diatom taxonomic variability, although some evidence was found that communities differed depending on the catchment type of the ponds. The results of this exploratory study are an important contribution to future works investigating stormwater diatom communities, where combined effects of biocides and other stormwater contaminants and community stressors, e.g., metals, PAHs, road salt, should be explicitly looked at.

中文翻译：

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不同土地利用和不同杀生物剂污染的雨水塘底栖硅藻群落的探索性研究

雨水滞留池接受各种城市和公路污染物，可能会对水生生物产生不利影响。在这项探索性研究中，研究了为公路，住宅，工业和工业/住宅混合流域服务的九个此类池塘的底栖硅藻群落组成。在池塘水中测量了十三种杀菌剂，作为硅藻生物分类变异性的可能解释因素之一。采样了最上面1 cm的沉积物，并鉴定出总共50个硅藻属。在池塘的硅藻群落中发现了中度至高度相似性。Navicula和Nitzschia这两个属，是最丰富的，占池塘相对丰度的19–47％。根据土地用途对硅藻属的估计相对丰度和池塘中测得的杀生物剂浓度进行分组。公路池塘与为居民和工业集水区服务的池塘有显着差异，而居民和工业池塘之间没有显着差异。尽管发现一些证据表明，根据池塘集水类型的不同，生物杀灭剂的存在本身不能解释硅藻的分类学变异性。这项探索性研究的结果对未来研究雨水硅藻群落的工作做出了重要贡献，在该研究中，杀生物剂和其他雨水污染物以及诸如金属，多环芳烃，路盐，