Department of Applied Ecology, Faculty of Biology and Environmental Protection, University of Łódź, 90-237 Łódź, 12/16 Banacha Str., Poland.
Department of Applied Ecology, Faculty of Biology and Environmental Protection, University of Łódź, 90-237 Łódź, 12/16 Banacha Str., Poland.
J Environ Manage. 2018 Jul 1;217:919-928. doi: 10.1016/j.jenvman.2018.03.114. Epub 2018 Apr 24.
The Bzura-7 pond (Łódź, Poland) is a typical shallow and shady urban reservoir situated on the Bzura River that is exposed to pollutants introduced mainly by internal loads and the supply from the catchment. In 2010-2012, the following characteristics were observed in the pond: a high allochthonous input of organic matter, high concentration of ammonium, low concentration of dissolved oxygen and low diversity of zooplankton, dominated mainly by Daphnia spp. From January to June 2013, restoration measures were performed, including sediment removal, increasing light access to the pond and construction of a sequential sedimentation-biofiltration system (SSBS). The aim of the present study was to investigate how the water quality in the Bzura-7 pond was affected by the restoration process, which included reducing pollutant inflows and enhancing habitat potential, thus increasing the diversity of this ecosystem. Restoration efforts improved the chemical and physical parameters of the water. The oxygen concentration increased, and the concentrations of TN and ammonium significantly decreased. Despite the increase in pond lighting, the growth of cyanobacteria was limited. However, we observed increased abundance of green algae and diatoms but less than adequate changes in the zooplankton community structures. Although we observed a significant increase in the zooplankton species richness after restoration, this increase was related to the small-bodied groups of zooplankton, rotifers and bosminiids, characteristic of eutrophic ecosystems. In addition, a planktivorous fish - sunbleak (Leucaspius delineatus) - was identified as an unintended side effect of the restoration effort. Further conservation efforts in the Bzura-7 pond and monitoring of results are still needed.
波兰罗兹市的 Bzura-7 池塘是一个典型的浅层、阴凉的城市水库，位于 Bzura 河上，受到主要由内部负荷和集水区供应带来的污染物的影响。在 2010 年至 2012 年期间，该池塘具有以下特征：大量异源有机物输入、铵盐浓度高、溶解氧浓度低、浮游动物多样性低，主要由 Daphnia spp. 组成。2013 年 1 月至 6 月，实施了修复措施，包括清除沉积物、增加池塘光照和建造顺序沉淀-生物过滤系统（SSBS）。本研究的目的是调查 Bzura-7 池塘的水质如何受到修复过程的影响，修复过程包括减少污染物流入和增强生境潜力，从而提高该生态系统的多样性。修复工作改善了水质的化学和物理参数。氧浓度增加，TN 和铵盐浓度显著降低。尽管增加了池塘的光照，但蓝藻的生长受到限制。然而，我们观察到绿藻和硅藻的丰度增加，但浮游动物群落结构的变化不足。尽管我们观察到修复后浮游动物物种丰富度显著增加，但这种增加与富营养化生态系统特有的小体型浮游动物、轮虫和 Bosminidae 有关。此外，一种食浮游动物的鱼类——太阳鱼（Leucaspius delineatus）——被认为是修复工作的意外副作用。Bzura-7 池塘仍需要进一步的保护努力和结果监测。
