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首页> 外文期刊>Estuarine Coastal and Shelf Science >Response of a salt marsh microbial community to metal contamination
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Response of a salt marsh microbial community to metal contamination

机译：盐沼微生物群落对金属污染的响应

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摘要

Salt marshes are important sinks for contaminants, namely metals that tend to accumulate around plant roots and could eventually be taken up in a process known as phytoremediation. On the other hand, microbial communities display important roles in the salt marsh ecosystems, such as recycling of nutrients and/or degradation of organic contaminants. Thus, plants can benefit from the microbial activity in the phytoremediation process. Nevertheless, above certain levels, metals are known to be toxic to microorganisms, fact that can eventually compromise their ecological functions. In this vein, the aim of present study was to investigate, in the laboratory, the effect of selected metals (Cd, Cu and Pb) on the microbial communities associated to the roots of two salt marsh plants. Sediments colonized by Juncus maritimus and Phragmites australis were collected in the River Lima estuary (NW Portugal), and spiked with each of the metals at three different Effects Range-Median (ERM) concentrations (1, 10×, 50×), being ERM the sediment quality guideline that indicates the concentration above which adverse biological effects may frequently occur. Spiked sediments were incubated with a nutritive saline solution, being left in the dark under constant agitation for 7 days. The results showed that, despite the initial sediments colonized by J. maritimus and P. australis displayed significant (p ＜ 0.05) differences in terms of microbial community structure (evaluated by ARISA), they presented similar microbial abundances (estimated by DAPI). Also, in terms of microbial abundance, both sediments showed a similar response to metal addition, with a decrease in number of cells only observed for the higher addition of Cu. Nevertheless, both Cu and Pb, at intermediate metals levels promote a shift in the microbial community structure, with possibly effect on the ecological function of these microbial communities in salt marshes. These changes may affect plants phytoremediation potential and further work on this subject is in need.
机译：盐沼是重要的污染物汇，即倾向于在植物根部附近积累的金属，最终可能会以一种称为植物修复的过程被吸收。另一方面，微生物群落在盐沼生态系统中发挥着重要作用，例如营养物质的循环利用和/或有机污染物的降解。因此，植物可以从植物修复过程中的微生物活性中受益。然而，已知金属在一定水平以上对微生物有毒，这一事实最终会损害其生态功能。因此，本研究的目的是在实验室研究选定的金属（Cd，Cu和Pb）对与两种盐沼植物根部相关的微生物群落的影响。在葡萄牙的利马河河口（葡萄牙西北部），采集了由海马草和芦苇定殖的沉积物，并以三种不同的作用浓度（ERM）浓度（1，10×，50×）将每种金属掺入，称为ERM。沉积物质量指南，指出浓度以上可能经常发生不利的生物学影响。尖刺的沉淀物与营养盐溶液一起孵育，在不断搅拌下在黑暗中放置7天。结果表明，尽管最初的沉积物在海生J. maritimus和P. australis的定殖下，在微生物群落结构方面存在显着差异（p ＜0.05）（由ARISA评估），但它们呈现出相似的微生物丰度（由DAPI估算）。同样，就微生物丰度而言，两种沉积物均显示出对金属添加的相似反应，只有增加铜的添加才能观察到细胞数量的减少。尽管如此，处于中间金属水平的Cu和Pb都促进了微生物群落结构的转变，并可能影响了盐沼中这些微生物群落的生态功能。这些变化可能会影响植物的植物修复潜力，因此需要在此问题上做进一步的工作。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第20期|81-88|共8页
  • 作者

    Ana P. Mucha; Catarina Teixeira; Izabela Reis; Catarina Magalhaes; Adriano A. Bordalo; C. Marisa R. Almeida;

  • 作者单位

    CIMAR/OIMAR, Centro Interdisciplinar de Investigacao Marinha e Ambiental, Universidade do Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal;

    CIMAR/OIMAR, Centro Interdisciplinar de Investigacao Marinha e Ambiental, Universidade do Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal,Laboratorio de Hidrobiologia, Institute de Ciencias Biomedicas, Universidade do Porto (ICBAS-UP), Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal;

    CIMAR/OIMAR, Centro Interdisciplinar de Investigacao Marinha e Ambiental, Universidade do Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal;

    CIMAR/OIMAR, Centro Interdisciplinar de Investigacao Marinha e Ambiental, Universidade do Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal;

    CIMAR/OIMAR, Centro Interdisciplinar de Investigacao Marinha e Ambiental, Universidade do Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal,Laboratorio de Hidrobiologia, Institute de Ciencias Biomedicas, Universidade do Porto (ICBAS-UP), Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal;

    CIMAR/OIMAR, Centro Interdisciplinar de Investigacao Marinha e Ambiental, Universidade do Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal;

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  • 正文语种 eng
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  • 关键词

    microbial communities; metal contamination; salt marshes; rhizosediments; ARISA;

    机译：微生物群落;金属污染;盐沼;根状糖;有沙;

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