Novel oil-associated bacteria in Arctic seawater exposed to different nutrient biostimulation regimes

IF 4.3 2区 生物学 Q2 MICROBIOLOGY
Francisco D. Davila Aleman, María A. Bautista, Janine McCalder, Kaiden Jobin, Sean M. C. Murphy, Brent Else, Casey R. J. Hubert
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Abstract

The Arctic Ocean is an oligotrophic ecosystem facing escalating threats of oil spills as ship traffic increases owing to climate change-induced sea ice retreat. Biostimulation is an oil spill mitigation strategy that involves introducing bioavailable nutrients to enhance crude oil biodegradation by endemic oil-degrading microbes. For bioremediation to offer a viable response for future oil spill mitigation in extreme Arctic conditions, a better understanding of the effects of nutrient addition on Arctic marine microorganisms is needed. Controlled experiments tracking microbial populations revealed a significant decline in community diversity along with changes in microbial community composition. Notably, differential abundance analysis highlighted the significant enrichment of the unexpected genera Lacinutrix, Halarcobacter and Candidatus Pseudothioglobus. These groups are not normally associated with hydrocarbon biodegradation, despite closer inspection of genomes from closely related isolates confirming the potential for hydrocarbon metabolism. Co-occurrence analysis further revealed significant associations between these genera and well-known hydrocarbon-degrading bacteria, suggesting potential synergistic interactions during oil biodegradation. While these findings broaden our understanding of how biostimulation promotes enrichment of endemic hydrocarbon-degrading genera, further research is needed to fully assess the suitability of nutrient addition as a stand-alone oil spill mitigation strategy in this sensitive and remote polar marine ecosystem.

Abstract Image

北极海水中暴露于不同营养生物刺激机制的新型石油相关细菌
北冰洋是一个寡营养生态系统,随着气候变化引起的海冰消退导致船舶流量增加,它面临着不断升级的溢油威胁。生物刺激是一种溢油缓解策略,它通过引入生物可利用的营养物质来提高地方性石油降解微生物对原油的生物降解能力。要使生物修复成为未来在北极极端条件下缓解溢油的可行对策,就需要更好地了解添加营养物质对北极海洋微生物的影响。跟踪微生物种群的控制实验显示,随着微生物群落组成的变化,群落多样性显著下降。值得注意的是,差异丰度分析突显了意想不到的 Lacinutrix、Halarcobacter 和 Candidatus Pseudothioglobus 属的显著富集。这些类群通常与碳氢化合物的生物降解无关,尽管对密切相关的分离物的基因组进行的仔细检查证实了它们具有碳氢化合物代谢的潜力。共现分析进一步揭示了这些菌属与众所周知的碳氢化合物降解细菌之间的重要关联,表明在油类生物降解过程中可能存在协同作用。虽然这些发现拓宽了我们对生物刺激如何促进地方性碳氢化合物降解菌属富集的理解,但仍需进一步研究,以全面评估在这一敏感而偏远的极地海洋生态系统中,添加营养物质作为独立的溢油缓解策略是否合适。
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来源期刊
Environmental microbiology
Environmental microbiology 环境科学-微生物学
CiteScore
9.90
自引率
3.90%
发文量
427
审稿时长
2.3 months
期刊介绍: Environmental Microbiology provides a high profile vehicle for publication of the most innovative, original and rigorous research in the field. The scope of the Journal encompasses the diversity of current research on microbial processes in the environment, microbial communities, interactions and evolution and includes, but is not limited to, the following: the structure, activities and communal behaviour of microbial communities microbial community genetics and evolutionary processes microbial symbioses, microbial interactions and interactions with plants, animals and abiotic factors microbes in the tree of life, microbial diversification and evolution population biology and clonal structure microbial metabolic and structural diversity microbial physiology, growth and survival microbes and surfaces, adhesion and biofouling responses to environmental signals and stress factors modelling and theory development pollution microbiology extremophiles and life in extreme and unusual little-explored habitats element cycles and biogeochemical processes, primary and secondary production microbes in a changing world, microbially-influenced global changes evolution and diversity of archaeal and bacterial viruses new technological developments in microbial ecology and evolution, in particular for the study of activities of microbial communities, non-culturable microorganisms and emerging pathogens
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