Emerging investigator series: interacting effects of environmental factors on Daphnia magna removal of Escherichia coli from wastewater,Environmental Science: Water Research & Technology

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Emerging investigator series: interacting effects of environmental factors on Daphnia magna removal of Escherichia coli from wastewater
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2021-2-22 , DOI: 10.1039/d1ew00008j
Seyyed M. H. Abtahi _{1,

2,

3,

4} , Ojaswi Aryal _{1,

2,

3,

4} , Niveen S. Ismail _{1,

2,

3,

4}

Affiliation

Treatment wetlands can remove a wide range of pollutants from wastewater and stormwater runoff, including microbial pollutants such as Escherichia coli. Filter feeding zooplankton play an important role in improving water quality in treatment wetlands through grazing and subsequent inactivation of E. coli. Understanding how climate change will impact the various processes governing microbial inactivation in treatment wetlands is essential to ensure adequately treated water. We investigated the impact of interacting environmental factors on the E. coli clearance rate of a keystone zooplankton species, Daphnia magna. We utilized a full factorial experimental design to test the impacts of food abundance, food type, and temperature in flow-through mesocosms under environmentally relevant conditions. Temperature and food abundance interactions were significant, which highlights the importance of studying multiple environmental variables when considering the filter feeding contributions of zooplankton. While both food abundance and temperature had a significant impact on clearance rate, daphnids did not exhibit a preference between algae or E. coli, which were the two food sources used in our studies. We observed that at 25 °C, food abundance and type had a larger impact on E. coli clearance rate than at 15 °C, which has important implications when considering resiliency of treatment wetlands in a warming climate. Our findings show that zooplankton filtration behavior will be impacted by environmental conditions that are projected due to climatic changes, but populations can still inactivate E. coli and improve water quality when exposed to these conditions.

中文翻译：

新兴研究者系列：环境因素对水蚤中大型蚤的去除作用

处理湿地可从废水和雨水径流中去除各种污染物，包括微生物污染物，例如大肠杆菌。滤食性浮游动物通过放牧和随后灭活大肠杆菌在改善湿地水质方面起着重要作用。了解气候变化将如何影响处理湿地中微生物灭活的各个过程，对于确保适当处理的水至关重要。我们调查了相互作用的环境因素对梯形浮游物种达芙妮（Daphnia magna）的大肠杆菌清除率的影响。我们使用了完整的析因实验设计来测试在环境相关条件下，食物丰度，食物类型和温度对流通型中观的影响。温度和食物丰度的相互作用非常重要，这凸显了在考虑浮游生物的滤食性贡献时研究多个环境变量的重要性。虽然食物的丰度和温度都对清除率有显着影响，但水蚤或大肠杆菌（在我们的研究中使用的两种食物来源）并未显示出蚤类动物的偏爱。我们观察到，在25°C时，食物丰度和类型对大肠杆菌的影响更大。清除率要高于15°C，这在考虑气候变暖下处理湿地的弹性时具有重要意义。我们的发现表明，浮游动物的过滤行为将受到气候变化所预计的环境条件的影响，但是当暴露于这些条件下时，种群仍可以使大肠杆菌失活并改善水质。

更新日期：2021-02-26

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