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首页> 外文期刊>Environmental Monitoring and Assessment >Bacterial response to dynamic metal concentrations in the surface sediments of a solar saltern (Goa, India)
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Bacterial response to dynamic metal concentrations in the surface sediments of a solar saltern (Goa, India)

机译：细菌对太阳能盐罐（印度果阿）表面沉积物中动态金属浓度的响应

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摘要

Abstract The Ribandar solar saltern, situated adjacent to the Mandovi estuary is influenced by the barge transport of ferromanganese ore to the Mormugao harbour (Arabian Sea). The current study focuses on the distribution of metals and related heterotrophic bacterial populations in the surface sediments (0-10 cm) of the Ribandar salterns (Goa, India) during the salt-making (January to May) and non salt-making seasons (August and November). The concentrations of heavy metals in the sediments ranged from 17.2± 2.8 to 26.3±6.7 % Fe; 0.6±0.2 to 0.9±0.2 % Mn; 27.6 ±7.3 to 51 ±8.3 ppmNi; 28.4±8.9 to 35.2±10.6 ppm Co; 44±21.6 to 62.8±23.6 ppm Zn; 0.1 ±0.01 ppm Cd and 1.7±0.1 to 2.6±0.7 ppm Pb and were much higher than those reported at the same site in a previous study by Kerkar (2004). Hg concentrations were below detection limits. In general, computation of "geoaccu-mulation index" revealed the sediments as 'uncontaminated to moderately contaminated' with Fe, Mn, Ni, Co, Pb and Zn during the salt-making season. The abundance of metal-tolerant bacteria was comparatively restricted to the salt-making season and was higher than the non salt-making season. Fe-, Mn-, Ni-, Co- and Pb- (200 ppm) tolerant bacteria were retrieved and restricted to the surface sediments (0-5 cm), Cd and Fe being the two most regulatory elements governing bacterial populations in the non salt-making season. However, during the salt-making season, the concentration of Zn was found to be pivotal in regulating the counts of Fe-, Mn- and Ni-tolerant bacteria. In general, the strength of correlation of metals and microbes was higher in the non salt-making season as compared to the salt-making season. This would probably indicate metal-induced limitations in microbial populations in the non salt-making season and the absence of this effect during the salt-making season. In this study, we test the hypothesis that solar salterns behave as ecological sinks with a potential to transform native bacterial populations to metal-resistant strains, in relation to the dynamic changes in the surrounding metal concentrations.
机译：摘要位于Mandovi河口附近的Ribandar太阳盐湖受到铁锰矿到Mormugao港口（阿拉伯海）的驳船运输的影响。当前的研究重点是在制盐（1月至5月）和非制盐季节（里约热内卢，印度果阿）的里班达盐湖（印度果阿）的表面沉积物（0-10厘米）中金属和相关异养细菌的分布（八月和十一月）。沉积物中重金属的浓度范围为17.2±2.8至26.3±6.7％Fe。 Mn 0.6±0.2至0.9±0.2％; 27.6±7.3至51±8.3 ppmNi; Co 28.4±8.9至35.2±10.6 ppm;锌44±21.6至62.8±23.6 ppm; 0.1±0.01 ppm的Cd和1.7±0.1至2.6±0.7 ppm的Pb，远高于Kerkar（2004）先前在同一地点报道的那些。汞浓度低于检测极限。通常，“地积累指数”的计算表明，在制盐季节，沉积物被铁，锰，镍，钴，铅和锌“未污染到中度污染”。耐金属细菌的丰度相对限于制盐季节，并且高于非制盐季节。回收了对铁，锰，镍，钴和铅（200 ppm）耐受的细菌，并将其限制在表面沉积物（0-5 cm）上，镉和铁是控制非细菌中细菌种群的两个最重要的调节元素。制盐季节。然而，在制盐季节，发现锌的浓度对于调节耐铁，耐锰和耐镍细菌的数量至关重要。通常，与制盐季节相比，非制盐季节中金属与微生物的相关强度更高。这可能表明在非制盐季节中金属引起的微生物种群限制，而在制盐季节中没有这种影响。在这项研究中，我们测试了这样一个假设，即与周围金属浓度的动态变化有关，太阳盐化器表现为生态汇，具有将原生细菌种群转化为抗金属菌株的潜力。

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  • 来源
    《Environmental Monitoring and Assessment》 |2013年第5期|3625-3636|共12页
  • 作者

    Flory Pereira; Savita Kerkar; K. P. Krishnan;

  • 作者单位

    Department of Biotechnology, Goa University,Taleigao Plateau,Goa, India;

    Department of Biotechnology, Goa University,Taleigao Plateau,Goa, India;

    National Centre for Antarctic and Ocean Research,Vasco da Gama,Goa, India;

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

    solar saltern; sediment; metals; bacteria;

    机译：太阳能盐罐沉淀;金属;菌;

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