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首页> 外文期刊>Estuarine Coastal and Shelf Science >Trace element bias in the use of CO_2 vents as analogues for low pH environments: Implications for contamination levels in acidified oceans
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Trace element bias in the use of CO_2 vents as analogues for low pH environments: Implications for contamination levels in acidified oceans

机译：在低pH环境中使用CO_2排放口作为类似物时的微量元素偏差：对酸化海洋中污染水平的影响

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摘要

Research into the effects of ocean acidification on marine ecosystems has increasingly focused on natural CO2 vents, although their intrinsic environmental complexity means observations from these areas may not relate exclusively to pH gradients. In order to assess trace element levels and distribution in the Levante Bay (Vulcano Island, NE Sicily, Italy) and its suitability for studying biological effects of pH decline, Ba, Fe and trace elements (As, Cd, Co, Cr, Cu, Hg, Mn, Mo, Ni, Pb, V and Zn) in sediment were analysed from 7 transects. Where present, Cymodocea nodosa leaves and epiphytes were also analysed. At the spatial scale of the bay, trace element concentrations in sediments and biota showed wide variability, possibly related to both input from fluid emissions and seawater physico-chemical variables (i.e. pH and Eh), which may considerably affect the solubility and bioavailability of potentially harmful trace elements. According to two pollution indices (MSPI: Marine Sediment Pollution Index and SQG-Q: Sediment Quality Guideline Quotient), the bay can be considered to be affected by low contamination with moderate potential for adverse biological effects, especially in the area between about 150 and 350 m from the primary vent, where localized detrimental effects on biota may occur. Generally, biological samples showed concentrations that were comparable with the lower values of seagrass ranges. The overall results of this study support the complex spatial dynamics of trace elements in the CO_2 vent studied, which are constrained by both direct input from the vent and/or biogeochemical processes affecting element precipitation at the sediment-seawater interface. Consequently, great caution should be used when relating biological changes along pH gradients to the unifactorial effect of pH only, as interactions with concurrent, multiple stressors, including trace element enrichments, may occur. This finding has implications for the use of CO_2 vents as analogues in ocean acidification research. They should be considered more appropriately as analogues for low pH environments with non-negligible trace element contamination which, in a scenario of continuous increase in anthropogenic pollution, may be very common.
机译：尽管海洋海洋酸化的内在环境复杂性意味着从这些地区观察到的结果可能并不仅仅与pH梯度有关，但对海洋酸化对海洋生态系统的影响的研究越来越侧重于天然二氧化碳的排放口。为了评估Levante湾（意大利西西里岛的Vulcano岛）中微量元素的含量和分布及其对研究pH下降，Ba，Fe和微量元素（As，Cd，Co，Cr，Cu，从7个样点分析了沉积物中的Hg，Mn，Mo，Ni，Pb，V和Zn）。如果存在的话，还分析了Cymodocea nodosa的叶子和附生植物。在海湾的空间尺度上，沉积物和生物区系中的痕量元素浓度表现出很大的变化性，可能与流体排放的输入和海水的理化变量（即pH和Eh）有关，这可能会极大地影响潜在的溶解度和生物利用度。有害的微量元素。根据两个污染指数（MSPI：海洋沉积物污染指数和SQG-Q：沉积物质量指南商），该海湾可被认为受到低污染的影响，对生物有不利的潜在影响，特别是在大约150至150之间的区域。离主要通风口350 m，可能会对生物群产生局部有害影响。通常，生物样品显示的浓度与海草范围的较低值相当。这项研究的总体结果支持了所研究的CO_2排放口中痕量元素的复杂空间动力学，这受到排放口直接输入和/或影响沉积物-海水界面元素沉淀的生物地球化学过程的约束。因此，当将沿pH梯度的生物变化与pH的单因素作用联系起来时，应格外谨慎，因为可能会发生与同时存在的多种应激源（包括微量元素富集）的相互作用。这一发现对在海洋酸化研究中使用CO_2排放口作为类似物具有重要意义。对于具有不可忽略的微量元素污染的低pH值环境，应该更适当地考虑使用它们，在人为污染持续增加的情况下，它们很常见。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第1期|19-30|共12页
  • 作者

    S. Vizzini; R. Di Leonardo; V. Costa; C.D. Tramati; F. Luzzu; A. Mazzola;

  • 作者单位

    Department of Earth and Marine Sciences, University of Palermo, CoNISMa, via Archirafi 18, 90123 Palermo, Italy;

    Department of Earth and Marine Sciences, University of Palermo, CoNISMa, via Archirafi 18, 90123 Palermo, Italy;

    Department of Earth and Marine Sciences, University of Palermo, CoNISMa, via Archirafi 18, 90123 Palermo, Italy;

    Department of Earth and Marine Sciences, University of Palermo, CoNISMa, via Archirafi 18, 90123 Palermo, Italy;

    Department of Earth and Marine Sciences, University of Palermo, CoNISMa, via Archirafi 18, 90123 Palermo, Italy;

    Department of Earth and Marine Sciences, University of Palermo, CoNISMa, via Archirafi 18, 90123 Palermo, Italy;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    seawater acidification; volcanic vent; metals; metalloids; marine sediment; seagrass;

    机译：海水酸化;火山喷口金属;类金属;海洋沉积物海草;

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