Enhanced bioaccumulation and biotransformation of As in coral reef organisms surrounding a marine shallow-water hydrothermal vent system
Enhanced bioaccumulation and biotransformation of As in coral reef organisms surrounding a marine shallow-water hydrothermal vent system
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海洋浅水热液喷口系统周围珊瑚礁生物体内砷的生物累积和生物转化增强
DOI：
10.1016/j.chemgeo.2012.02.023
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发表时间：
--
期刊：
影响因子：
3.9
通讯作者：
Pichler
中科院分区：
文献类型：
--
作者：
London;Walllschäger;Ruiz- Chancho;Pichler
巴布亚新几内亚安比特尔岛Tutum湾的海洋浅水热液系统每天向珊瑚礁生态系统排放1.5kg砷。尽管释放了大量的As，但珊瑚礁生物似乎并没有受到影响。我们研究了软珊瑚Clavularia sp.对地热无机As的吸收和生物累积，钙质藻类Halimeda sp.，和海鞘Polycarpa sp.，通过测量每种生物体组织中的总砷浓度（TA），并将其与从附近对照点收集的相同类型的生物体进行比较。从热液区收集的所有生物体显示出明显较高的（2至20倍）TA相比，控制网站。浓度通常较高的样本收集更接近重点热液喷口，这是第一个直接证据，增强生物积累的生物体生活在热液的影响。为了评估有机砷的生物转化，阴离子和阳离子砷物种测定的IC-ICP-MS在甲醇/水组织提取物。与对照地点相比，热液喷口地点的几种有机砷物种的浓度要高得多，几种有机砷物种仅存在于热液样本中，包括一些无法识别的物种。虽然有趣，但由于提取效率低，这些形态分析结果无法得到有力的解释。未来的研究人员应该尝试将提取效率提高到接近100%，这将允许更准确地描述生活在这些环境中的海洋生物的生物合成途径。
The marine shallow-water hydrothermal system in Tutum Bay, Ambitle Island, Papua New Guinea discharges as much as 1.5kg of arsenic (As) per day into a coral reef ecosystem. Despite the amount of As released, coral reef organisms do not seem to be affected. We investigated the uptake and bioaccumulation of geothermally-derived inorganic As by the soft coral Clavularia sp., the calcareous algae Halimeda sp., and the sea squirt Polycarpa sp., by measuring the total As concentration (TAs) in tissues from each organism and comparing it to the same type of organism collected from a nearby control site. All organisms collected from the hydrothermal area displayed distinctly higher (2 to 20 times) TAs compared to the control site. Concentrations were typically higher in samples collected closer to the focused hydrothermal venting, which is the first direct evidence for enhanced bioaccumulation of As in organisms living within an area of hydrothermal influence. To assess As biotransformation to organoarsenicals, anionic and cationic As species were determined by IC-ICP-MS in methanol/water tissue extracts. The concentrations of several of the organoarsenic species were much higher at the hydrothermal vent site compared to the control site, and several organoarsenic species were present only in the hydrothermal samples, including some unidentifiable species. While intriguing, these speciation results cannot be interpreted robustly due to poor extraction efficiencies. Future researchers should attempt to improve the extraction efficiency to closer to 100%, which would allow a more accurate description of As biosynthesis pathways for the marine organisms living in these environments.
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DOI：
--
发表时间：
2001
期刊：
影响因子：
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DOI：
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发表时间：
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