Response characteristics of bacterial communities in multiple coral genera at the early stages of coral bleaching during El Niño
Response characteristics of bacterial communities in multiple coral genera at the early stages of coral bleaching during El Niño
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DOI：
10.1016/j.ecolind.2022.109569
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发表时间：
2022-11
影响因子：
6.9
通讯作者：
Fulin Sun;Hongqiang Yang;Xiyang Zhang;Fei Tan;Qi Shi
中科院分区：
文献类型：
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作者：
Fulin Sun;Hongqiang Yang;Xiyang Zhang;Fei Tan;Qi Shi
尽管高温引起的珊瑚白化引起了人们的高度关注，但珊瑚微生物组对白化的反应尚未得到彻底探索。在这项研究中，利用高通量测序技术对厄尔尼诺现象期间南海 26 个半白化珊瑚属的细菌群落进行了研究。主坐标分析（PCoA）表明，早期白化的影响超过了珊瑚物种对细菌群落的影响。白化导致珊瑚细菌群落发生显着变化。白化珊瑚中伯克霍尔德氏菌目、柄杆菌目、假单胞菌目、噬细胞菌目、海洋螺菌目和红杆菌目显着富集，而根瘤菌目、蓝藻目、微毛菌目、热厌氧杆菌目、毛螺旋菌目、立克次体目和乳杆菌目丰度下降。核心细菌OTU（操作分类单位）表明，高温有利于产碱菌、大肠杆菌、不动杆菌、葡萄球菌和肠杆菌科等潜在致病菌占据核心位置。进一步的白化导致珊瑚中潜在的核心益生菌显着减少。这可能会增加珊瑚感染疾病的风险并降低其环境适应性。网络分析表明，白化珊瑚中的细菌相互作用比未白化珊瑚更复杂。拟杆菌目、伯克氏菌目、柄杆菌目、乳酸杆菌目和根瘤菌目是白化和未白化珊瑚中与其他细菌相互作用的主要类群。这些优势类群的存在导致化学异养、碳氢化合物降解、氮呼吸和反硝化作用的增加，从而导致珊瑚微环境发生巨大变化。这项研究全面揭示了珊瑚细菌在白化过程中的反应机制。
Although coral bleaching caused by high temperatures has attracted great concern, the response of the coral microbiome to bleaching has not been thoroughly explored. In this study, bacterial communities from 26 genera of semi-bleached coral in the South China Sea were studied using high-throughput sequencing during El Niño. Principal coordinates analysis (PCoA) indicated that the effect of early bleaching exceeded the effect of coral species on the bacterial communities. Bleaching caused significant changes in coral bacterial communities. Burkholderiales, Caulobacterales, Pseudomonadales, Cytophagales, Oceanospirillales, and Rhodobacterales, were significantly enriched in bleaching coral, whereas Rhizobiales, Cyanobacteria, Microtrichales, Thermoanaerobaculales, Lachnospirales, Rickettsiales, and Lactobacillales, decreased in abundance. Core bacterial OTUs (operational taxonomic units) showed that high temperatures facilitated potentially pathogenic bacteria, such asAlcaligenes,Escherichia,Acinetobacter,Staphylococcus, and Enterobacteriaceae to occupy core positions. Further bleaching resulted in a significant reduction of potential core probiotics in corals. This could increase the risk of corals contracting diseases and reduce their environmental adaptability. Network analysis indicated that the bacterial interactions in bleaching coral were more complex than unbleached coral. Bacteroidales, Burkholderiales, Caulobacterales, Lactobacillales and Rhizobiales were the main taxa that interacted with other bacteria in bleaching and unbleached corals. The presence of these dominant taxa resulted in an increase in chemoheterotrophy, hydrocarbon degradation, nitrogen respiration, and denitrification, which led to great changes in the coral microenvironment. This study comprehensively revealed the response mechanism of coral bacteria during the bleaching process.