细菌藿四醇异构体BHT-x:海洋水体缺氧的新型代用指标

The application progress of BHT-x as biomarker to marine hypoxia

  • 摘要: 海洋缺氧是当前人类面临的重大生态环境问题之一,对海洋生物、元素循环及全球气候变化都产生了重要影响。细菌藿多醇(bacteriohopanepolyols,BHPs)是一种来源于细菌细胞膜的五环三萜类化合物,也是地质体中普遍存在的藿烷类化合物的生物前体物质,作为生物标志物被广泛应用于示踪陆源有机质,指示好氧甲烷氧化等生态过程。本文聚焦于BHPs中重要的一种脂类化合物—BHT-x(细菌藿四醇异构体之一),总结了其生物来源及验证过程,并简介了目前BHT-x ratio作为水体缺氧代用指标在海洋环境中的应用研究。利用BHT-x来重建长时间尺度的缺氧现象,可以帮助我们更好地认识海洋缺氧过程,为我们预测和应对未来海洋环境的变化提供更多的理论依据。

     

    Abstract: Marine hypoxia is one of the major ecological and environmental problems at present as it has important impact on marine organisms, chemical element cycle, and global climate. Bacteriohopanepolyols (BHPs) are a group of pentacyclic triterpenoid compound derived from bacterial cell membranes, and also the biological precursor of hopane that are ubiquitous in geological records. BHPs have been widely used as a biomarker in tracing terrestrial organic matter and indicating aerobic methane oxidation. By focusing on bacteriohopanetetrol (BHT)-x, an important member of BHPs that could be used to indicate anaerobic ammonia oxidation and water hypoxia, we reviewed its biological origination and the verification, and briefly introduced the application of the BHT-x ratio (the ratio of BHT-x over total BHT) as a proxy of water column hypoxia for different marine environments, including samples of suspended particles and sediments. The application of BHT-x could help us reconstruct marine hypoxia evolution, and predict and protect the modern marine environment with richer theoretical evidence.

     

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