Ocean College, Zhejiang University, Zhoushan, 316021, China; Key Laboratory of Marine Environmental Survey Technology and Application, Ministry of Natural Resources, Guangzhou, 510030, China.
Ocean College, Zhejiang University, Zhoushan, 316021, China.
Environ Res. 2024 Dec 1;262(Pt 2):119977. doi: 10.1016/j.envres.2024.119977. Epub 2024 Sep 13.
Coral-associated bacteria are sensitive to the health status of coral and proven biomarker(s) of the coral bleaching. However, whether coral specificity or health status play a key role when coral-associated bacteria responding to coral bleaching is not known. Therefore, the bacterial communities of five species of healthy and bleached corals, Acropora millepora, Favites abdita, Galaxea fascicularis, Dipsastraea speciosa and Pocillopora damicornis, were collected along the coast of Sanya, South China Sea and targeted for associated bacterial studies. The relative abundance of the dominant class Gammaproteobacteria tended to be higher in healthy corals, while Alphaproteobacteria were more abundant in bleached corals. Dominant genus Achromobacter demonstrated higher relative abundance in healthy corals (0.675) than in bleached corals (0.151). Most of the bleached corals had high α diversity, β dispersion, heterogeneity and complexity of the co-occurrence network of bacterial communities, which support the 'Anna Karenina Principle (AKP)' of diverse in threatened objects and conserved in healthy ones. The bacterial communities in the bleached corals were mostly involved in the selection process, and communities in the healthy corals were involved in the undominated process, which is obtained based on the null model test of β nearest-taxon-index (βNTI) and Bray-Curtis-based Raup-Crick (RC). This evidence further confirmed the AKP and revealed that the bacterial communities in the bleached corals were driven by deterministic factors. These findings provide valuable insights into the connection between bacterial and coral status, and the application of the AKP in the changing patterns of bacterial communities during coral bleaching.
珊瑚相关细菌对珊瑚的健康状况敏感，是珊瑚白化的生物标志物。然而，当珊瑚相关细菌对珊瑚白化做出响应时，是珊瑚的特异性还是健康状况起着关键作用尚不清楚。因此，本研究从南海三亚沿岸采集了健康和白化的五种珊瑚（鹿角杯形珊瑚、平凹滨珊瑚、华丽鹿角珊瑚、美丽四射珊瑚和鞍形真叶珊瑚）的细菌群落样本，并进行了相关的细菌研究。优势类群γ变形菌的相对丰度在健康珊瑚中较高，而α变形菌在白化珊瑚中较丰富。优势属无色杆菌在健康珊瑚（0.675）中的相对丰度高于白化珊瑚（0.151）。大多数白化珊瑚具有较高的α多样性、β离散度、异质性和细菌群落共生网络的复杂性，这支持了受威胁物体多样性和健康物体保守性的“安娜·卡列尼娜原理（AKP）”。白化珊瑚中的细菌群落主要参与选择过程，而健康珊瑚中的细菌群落主要参与非优势过程，这是基于β最近分类单元指数（βNTI）和基于 Bray-Curtis 的 Raup-Crick（RC）的 null 模型检验得到的。这一证据进一步证实了 AKP，并表明白化珊瑚中的细菌群落是由确定性因素驱动的。这些发现为细菌和珊瑚状态之间的联系提供了有价值的见解，并为 AKP 在珊瑚白化过程中细菌群落变化模式中的应用提供了依据。
