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首页> 外文期刊>Environmental toxicology and chemistry >EFFECTS OF TITANIUM DIOXIDE (TiO_2) NANOPARTICLES ON CARIBBEAN REEF-BUILDING CORAL (MONTASTRAEA FAVEOLATA)
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EFFECTS OF TITANIUM DIOXIDE (TiO_2) NANOPARTICLES ON CARIBBEAN REEF-BUILDING CORAL (MONTASTRAEA FAVEOLATA)

机译：二氧化钛（TiO_2）纳米颗粒对珊瑚礁建珊瑚（红花山核桃）的影响

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摘要

Increased use of manufactured titanium dioxide nanoparticles (nano-TiO_2) is causing a rise in their concentration in the aquatic environment, including coral reef ecosystems. Caribbean mountainous star coral (Montastraea faveolata) has frequently been used as a model species to study gene expression during stress and bleaching events. Specimens of M. faveolata were collected in Panama and exposed for 17 d to nano-TiO_2 suspensions (0.1 mg L~(-1) and 10 mg L~(-1)). Exposure to nano-TiO_2 caused significant zooxanthellae expulsion in all the colonies, without mortality. Induction of the gene for heat-shock protein 70 (HSP70) was observed during an early stage of exposure (day 2), indicating acute stress. However, there was no statistical difference in HSP70 expression on day 7 or 17, indicating possible coral acclimation and recovery from stress. No other genes were significantly upregulated. Inductively coupled plasma mass spectrometry analysis revealed that nano-TiO_2 was predominantly trapped and stored within the posterior layer of the coral fragment (burrowing sponges, bacterial and fungal mats). The bioconcentration factor in the posterior layer was close to 600 after exposure to 10 mg L~(-1) of nano-TiO_2 for 17 d. The transient increase in HSP70, expulsion of zooxanthellae, and bioaccumulation of nano-TiO_2 in the microflora of the coral colony indicate the potential of such exposure to induce stress and possibly contribute to an overall decrease in coral populations.
机译：人造二氧化钛纳米颗粒（nano-TiO_2）使用量的增加导致其在包括珊瑚礁生态系统在内的水生环境中的浓度增加。加勒比山区的明星珊瑚（Montastraea faveolata）经常被用作研究压力和漂白事件中基因表达的模型物种。在巴拿马收集了藏青霉的标本，并将其暴露于纳米TiO_2悬浮液（0.1 mg L〜（-1）和10 mg L〜（-1））17 d。暴露于纳米TiO_2导致所有菌落均被大量驱除黄原虫，无死亡。在暴露的早期阶段（第2天）观察到热激蛋白70（HSP70）基因的诱导，表明存在急性应激。但是，在第7天或第17天，HSP70表达没有统计学差异，表明珊瑚可能适应环境并从压力中恢复。没有其他基因被显着上调。电感耦合等离子体质谱分析表明，纳米TiO_2主要被捕获并存储在珊瑚碎片的后层（挖海绵，细菌和真菌垫）中。暴露于10 mg L〜（-1）的纳米TiO_2溶液17 d后，后层的生物富集系数接近600。 HSP70的瞬时增加，虫黄藻的排出以及珊瑚群落微生物区系中纳米TiO_2的生物蓄积表明这种暴露有可能诱发压力，并可能导致珊瑚种群总体减少。

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  • 来源
    《Environmental toxicology and chemistry》 |2014年第6期|1346-1353|共8页
  • 作者

    Boris Jovanovic; Hector M. Guzman;

  • 作者单位

    Department of Fish Diseases and Fisheries Biology, Faculty of Veterinary Medicine, Ludwig Maximilian University of Munich, Munich, Germany;

    Smithsonian Tropical Research Institute, Balboa, Republic of Panama, Panama;

  • 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

    Titanium dioxide nanoparticles; Coral; Zooxanthellae; Toxicology;

    机译：二氧化钛纳米粒子;珊瑚;虫黄藻;毒理学;

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