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首页> 外文期刊>Environmental toxicology and chemistry >Elevated Magnesium Concentrations Altered Freshwater Assemblage Structures in a Mesocosm Experiment
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Elevated Magnesium Concentrations Altered Freshwater Assemblage Structures in a Mesocosm Experiment

机译：升高的镁浓度在Mesocosm实验中改变了淡水组合结构

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摘要

Magnesium (Mg) is a mining-related contaminant in the Alligators Rivers Region of tropical northern Australia. A mesocosm experiment was used to assess Mg toxicity to aquatic freshwater assemblages. Twenty-five 2700-L tubs were arranged, stratified randomly, on the bed of Magela Creek, a seasonally flowing, sandy stream channel in the Alligator Rivers Region of northern Australia. The experiment comprised 5 replicates of 4 nominal Mg treatments, 2.5, 7.5, 23, and 68 mg L-1, and a control. Phytoplankton biomass, and diatom, zooplankton, and macroinvertebrate assemblages present in the treatment tubs were sampled before and after Mg addition. A significant negative relationship between phytoplankton biomass and Mg was observed 4 wk after Mg addition as measured by chlorophyll a concentrations (r(2) = 0.97,p = 0.01). This result was supported by reductions in some major phytoplankton groups in response to increasing Mg concentrations, in the same experiment and from independent field studies. There was a significant negative relationship between zooplankton assemblage similarity (to control) and Mg concentrations (r(2) = 0.96,p = 0.002). Seven weeks after Mg addition, macroinvertebrate assemblages were dominated by 3 microcrustacean groups (Ostracoda, Cladocera, and Copepoda), each reaching maximum abundance at intermediate Mg concentrations (i.e., unimodal responses). The responses of phytoplankton and zooplankton were used to derive assemblage effect concentrations (Mg concentrations resulting inx% of the assemblage change [ECx]). Magnesium concentrations resulting in assemblage EC01 values were 3 mg L-1. Together with candidate guideline values from other laboratory- and field-based lines of evidence, the mesocosm EC01 values were incorporated into a weight-of-evidence framework for a robust regulatory approach to environmental protection.Environ Toxicol Chem2020;00:1-15. (c) 2020 Commonwealth of Australia. Published by Wiley Periodicals LLC on behalf of SETAC.
机译：镁（Mg）是在澳大利亚热带北部的鳄鱼河地区的采矿相关污染物。 Mesocosm实验用于评估对水生淡水组合的Mg毒性。在澳大利亚北部鳄鱼河地区的季节性流动的季节性流动，季节性流动，季节性流动的桑迪流渠道中随机排列了二十五个2700-L浴缸。实验组包含5个标称Mg处理的5种，2.5,7.5,23和68mg L-1和对照。在Mg加入之前和之后，在治疗浴缸中采样浮游植物生物量和硅藻，曲折，以及治疗浴缸的大型蠕虫组合。在通过叶绿素的浓度（R（2）= 0.97，p = 0.01）测量后，观察到浮游植物生物量和Mg之间的显着的阴性关系。在同一实验和独立场研究中，在一些主要浮游植物组中减少了一些主要浮游植物组的降低支持该结果。浮游植物组合相似性（对照）和Mg浓度（R（2）= 0.96，P = 0.002）之间存在显着的负面关系。 Mg加法后七周，长静脉组合均以3微都菌（Ostracoda，Cladocera和Copepoda）为主，每组以中间体Mg浓度（即单峰反应）达到最大丰度。浮游植物和浮游植物的反应用于导出组合效应浓度（Mg浓度，导致组合变化的Inx％[ECX]）。导致组合EC01值的镁浓度<3mg L-1。与其他基于实验室和现场证据的候选指南值一起，Mesocosm EC01值被纳入了稳健的环境保护方法的权重框架中，以获得稳健的环境保护方法.ENVIRON毒素Chem2020202202020; 00：1-15。 （c）2020澳大利亚联邦。由Wiley期刊LLC发布代表Setac。

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  • 来源
    《Environmental toxicology and chemistry》 |2020年第10期|1973-1987|共15页
  • 作者

    Mooney Thomas J.; McCullough Cherie D.; Jansen Andrew; Chandler Lisa; Douglas Michael; Harford Andrew J.; van Dam Rick; Humphrey Chris;

  • 作者单位

    Australian Govt Dept Environm & Energy Environm Res Inst Supervising Scientist Darwin NT Australia;

    Mine Lakes Consulting Joonalup WA Australia;

    Australian Govt Dept Environm & Energy Environm Res Inst Supervising Scientist Darwin NT Australia;

    Australian Govt Dept Environm & Energy Environm Res Inst Supervising Scientist Darwin NT Australia;

    Univ Western Australia Perth WA Australia;

    Australian Govt Dept Environm & Energy Environm Res Inst Supervising Scientist Darwin NT Australia;

    Australian Govt Dept Environm & Energy Environm Res Inst Supervising Scientist Darwin NT Australia;

    Australian Govt Dept Environm & Energy Environm Res Inst Supervising Scientist Darwin NT Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Phytoplankton; Zooplankton; Multiple lines of evidence; Mining effects; Tropical waters;

    机译：Phytoplankton;浮游动物;多条证据;采矿效果;热带水域;

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