Response of Microbial Communities to Naturally Occurring Radioactive Material–Contaminated Sediments: A Microcosm-Based Study

IF 3.6 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Environmental Toxicology and Chemistry Pub Date : 2024-05-31 DOI:10.1002/etc.5887

Amy MacIntosh, Katherine Dafforn, Anthony Chariton, Darren Koppel, Tom Cresswell, Francesca Gissi

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Abstract

There is a growing need to understand the potential ecological impacts of contaminants in offshore oil and gas infrastructure, especially if that infrastructure is to be left in situ as a decommissioning option. Naturally occurring radioactive material (NORM) is one type of contaminant found in solid deposits on internal surfaces of infrastructure that poses potential ecological harm if released into the marine environment. Microbes are important components of marine sediment ecosystems because they provide ecosystem services, yet the impacts of NORM contamination to these communities are not well understood. The present study aimed to investigate the response of benthic microbial communities to NORM-contaminated scale, collected from an offshore oil and gas system, via controlled laboratory microcosm studies. Changes to microbial communities in natural sediment and sediments spiked with NORM at radium-226 activity concentrations ranging from 9.5 to 59.8 Bq/kg (in partial equilibria with progeny) over 7 and 28 days were investigated using high-throughput sequencing of environmental DNA extracted from experimental sediments. There were no significant differences in microbial community composition between control and scale-spiked sediments over 7 and 28 days. However, we observed a greater presence of Firmicutes in the scale-mixed treatment and Chloroflexi in the scale-surface treatments after 28 days. This could suggest selection for species with contaminant tolerance or potential resilience to radiation and metal toxicity. Further research is needed to explore microbial tolerance mechanisms and their potential as indicators of effects of radionuclide-contaminated sediments. The present study demonstrated that microcosm studies can provide valuable insights about the potential impacts of contamination from oil and gas infrastructure to sediment microbial communities. Environ Toxicol Chem 2024;43:1648–1661. © 2024 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.

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微生物群落对天然放射性物质污染沉积物的反应：基于微观世界的研究。

人们越来越需要了解近海油气基础设施中的污染物对生态环境的潜在影响，尤其是如果要将这些基础设施留在原地作为一种退役方案的话。天然放射性物质（NORM）是一种存在于基础设施内表面固体沉积物中的污染物，如果释放到海洋环境中，可能会对生态造成危害。微生物是海洋沉积物生态系统的重要组成部分，因为它们提供生态系统服务，但人们对 NORM 污染对这些群落的影响还不甚了解。本研究旨在通过受控实验室微观世界研究，调查底栖微生物群落对从近海油气系统收集到的 NORM 污染鳞片的反应。通过对从实验沉积物中提取的环境 DNA 进行高通量测序，研究了天然沉积物和添加了 NORM 的沉积物中微生物群落在 7 天和 28 天内的变化情况，NORM 的放射性活度浓度范围为 9.5 至 59.8 Bq/kg（与祖先部分平衡）。在 7 天和 28 天内，对照沉积物和添加了鳞片的沉积物的微生物群落组成没有明显差异。不过，我们观察到，28 天后，在鳞片混合处理中出现了更多的真菌，而在鳞片表面处理中出现了更多的绿藻。这可能表明，我们选择了具有污染物耐受性或潜在抗辐射和金属毒性能力的物种。需要进一步研究微生物的耐受机制及其作为放射性核素污染沉积物影响指标的潜力。本研究表明，微观世界研究可为了解油气基础设施污染对沉积物微生物群落的潜在影响提供宝贵的见解。环境毒物化学 2024;00:1-14。© 2024 作者。环境毒理学与化学》由 Wiley Periodicals LLC 代表 SETAC 出版。

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来源期刊

Environmental Toxicology and Chemistry 环境科学-毒理学

CiteScore

7.40

自引率

9.80%

发文量

265

审稿时长

3.4 months

期刊介绍： The Society of Environmental Toxicology and Chemistry (SETAC) publishes two journals: Environmental Toxicology and Chemistry (ET&C) and Integrated Environmental Assessment and Management (IEAM). Environmental Toxicology and Chemistry is dedicated to furthering scientific knowledge and disseminating information on environmental toxicology and chemistry, including the application of these sciences to risk assessment.[...] Environmental Toxicology and Chemistry is interdisciplinary in scope and integrates the fields of environmental toxicology; environmental, analytical, and molecular chemistry; ecology; physiology; biochemistry; microbiology; genetics; genomics; environmental engineering; chemical, environmental, and biological modeling; epidemiology; and earth sciences. ET&C seeks to publish papers describing original experimental or theoretical work that significantly advances understanding in the area of environmental toxicology, environmental chemistry and hazard/risk assessment. Emphasis is given to papers that enhance capabilities for the prediction, measurement, and assessment of the fate and effects of chemicals in the environment, rather than simply providing additional data. The scientific impact of papers is judged in terms of the breadth and depth of the findings and the expected influence on existing or future scientific practice. Methodological papers must make clear not only how the work differs from existing practice, but the significance of these differences to the field. Site-based research or monitoring must have regional or global implications beyond the particular site, such as evaluating processes, mechanisms, or theory under a natural environmental setting.

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