Structural and functional responses of periphyton and macroinvertebrate communities to ferric Fe, Cu, and Zn in stream mesocosms.
Structural and functional responses of periphyton and macroinvertebrate communities to ferric Fe, Cu, and Zn in stream mesocosms.
复制标题
河流中生态系统中附生植物和大型无脊椎动物群落对铁、铜和锌的结构和功能反应。
DOI：
10.1002/etc.4070
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发表时间：
2018
影响因子：
4.1
通讯作者：
Clements,WilliamH
中科院分区：
文献类型：
--
作者：
Cadmus,Pete;Guasch,Helena;Herdrich,AdamT;Bonet,Berta;Urrea,Gemma;Clements,WilliamH
进行了两个中观实验，研究了铁（Fe）和铁与水金属（Cu, Zn）的混合物对河流底栖生物群落的影响。自然定植的底栖生物群落暴露于铁梯度（0,0.4,1.0,2.5,6.2和15.6 mg/L），该梯度覆盖了当前美国环境保护署水质标准值（1.0 mg/L）。暴露10 d后，大型无脊椎动物总丰度、类群数量和主要类群（蜉蝣目、翼翅目、毛翅目和双翅目）的丰度均显著降低。七氏蜉蝣和摇蝇对铁氧化物沉积特别敏感，在总铁含量为0.4和1.0 mg/L时，其氧化还原效果显著。在第二个中生态实验中，浮游植物和大型无脊椎动物群落在低（0.01 mg/L Cu + 0.1 mg/L Zn）和高（0.05 mg/L Cu + 0.5 mg/L Zn） 2种处理水平下，分别与水Cu和Zn （0.60 mg/L）和不含水Cu和Zn的条件下暴露于铁（0.60 mg/L）。与以前的研究相反，我们没有观察到铁对金属毒性有保护作用的证据。铁和水金属均显著降低了周围植物的生长速率和蛋白质含量，而单铁显著降低了七元蝇（Cinygmula）的丰度和整个群落的代谢。我们推测，铁氧化物抑制藻类生长，增加金属积累，导致食草动物食物资源的数量和质量下降。利用天然底栖生物群落进行的中生态实验提供了一个独特的机会，可以量化间接物理效应的相对重要性，并更好地了解自然河流生态系统中基础食物资源和消费者之间的关系。环境科学学报，2018;37(3):1320 - 1329。©2017 setac
Two mesocosm experiments were conducted to examine effects of ferric iron (Fe) and mixtures of ferric Fe with aqueous metals (Cu, Zn) on stream benthic communities. Naturally colonized benthic communities were exposed to a gradient of ferric Fe (0, 0.4, 1.0, 2.5, 6.2, and 15.6 mg/L) that bracketed the current US Environmental Protection Agency water quality criterion value (1.0 mg/L). After 10 d of exposure to ferric Fe, total macroinvertebrate abundance, number of taxa, and abundance of all major macroinvertebrate groups (Ephemeroptera, Plecoptera, Trichoptera, and Diptera) were significantly reduced. Heptageniid mayflies and chironomids were especially sensitive to Fe oxide deposition and were significantly reduced at 0.4 and 1.0 mg/L total Fe, respectively. In a second mesocosm experiment, periphyton and macroinvertebrate communities were exposed to ferric Fe (0.60 mg/L) with or without aqueous Cu and Zn at 2 treatment levels: low (0.01 mg/L Cu + 0.1 mg/L Zn) and high (0.05 mg/L Cu + 0.5 mg/L Zn). In contrast to previous research, we observed no evidence of a protective effect of Fe on toxicity of metals. Growth rates and protein content of periphyton were significantly reduced by both ferric Fe and aqueous metals, whereas abundance of heptageniid mayflies (Cinygmula) and whole community metabolism were significantly reduced by ferric Fe alone. We hypothesize that Fe oxides inhibited algal growth and enhanced metal accumulation, leading to a reduction in the quantity and quality of food resources for grazers. Mesocosm experiments conducted using natural benthic communities provide a unique opportunity to quantify the relative importance of indirect physical effects and to develop a better understanding of the relationship between basal food resources and consumers in natural stream ecosystems.Environ Toxicol Chem2018;37:1320–1329. © 2017 SETAC