背景:珊瑚礁是生物多样性和生产力最高的生态系统之一,为大量物种提供栖息地。具有共生微生物组的造礁巩膜珊瑚,包括细菌,古细菌,病毒和真核微生物,是指珊瑚类。其中,珊瑚病,主要由弧菌引起。,极大地导致了珊瑚覆盖率和多样性的丧失。全球的栖息地过滤导致了海洋细菌群落的各种结构。珊瑚物种,西沙群岛和大亚湾(广东省)的数量和特征存在显著差异。因此,弧菌群落在珊瑚富国和穷国之间可能是不同的。
结果:通过比较富含珊瑚(西沙群岛)和缺乏珊瑚(大亚湾)的地点之间的弧菌动力学,我们发现了弧菌丰度的差异,多样性,与珊瑚相关的群落组成和组装机制。在珊瑚丰富的地区,弧菌的丰度较高可能表明弧菌与珊瑚之间存在强烈的相互作用。V.Campbellii,paraphobacteriummarinum和V.caribbeanicus广泛分布于珊瑚富区和贫困地区,可能表明在珊瑚刺激的弧菌生长中物种特异性较弱。随机森林预测显示,弧菌物种和光细菌物种是珊瑚丰富和珊瑚贫困地区的潜在微生物指标,分别。西沙群岛的弧菌群落聚集受到生态漂移而不是选择的支配。相对而言,同质化选择对大亚湾社区来说更为重要,这可能反映了栖息地过滤的作用。
结论:本研究揭示了弧菌的不同分布规律和组装机制。在珊瑚富国和贫困地区之间,为珊瑚礁地区弧菌群落的研究提供了背景数据,可能有助于在生物水平上保护珊瑚礁。造成这种差异的主要原因是珊瑚的数量和种类不同,环境(例如,温度)和空间因素。它反映了弧菌和珊瑚之间的强烈相互作用,为珊瑚礁生态系统中弧菌的研究提供了新的视角。
BACKGROUND: Coral reefs are one of the most biodiverse and productive ecosystems, providing habitat for a vast of species. Reef-building scleractinian corals with a symbiotic microbiome, including bacteria, archaea, viruses and eukaryotic microbes, are referred to coral holobionts. Among them, coral diseases, mainly caused by Vibrio spp., have significantly contributed to the loss of coral cover and diversity. Habitat filtering across the globe has led to a variety structure of marine bacterial communities. Coral species, quantity and characteristics are significant differences between the Xisha Islands and Daya Bay (Guangdong Province). Thus, the Vibrio communities may be distinct between coral rich and poor areas.
RESULTS: Through comparison of Vibrio dynamics between coral-rich (Xisha Islands) and coral-poor (Daya Bay) locations, we uncovered differences in Vibrio abundance, diversity, community composition and assembly mechanisms associated with corals. The higher abundance of Vibrio in coral rich areas may indicate a strong interaction between vibrios and corals. V. campbellii, Paraphotobacterium marinum and V. caribbeanicus were widely distributed in both coral rich and poor areas, likely indicating weak species specificity in the coral-stimulated growth of Vibrio. Random-forest prediction revealed Vibrio species and Photobacterium species as potential microbial indicators in the coral rich and coral poor areas, respectively. Ecological drift rather than selection governed the Vibrio community assembly in the Xisha Islands. Comparatively, homogenizing selection was more important for the Daya Bay community, which may reflect a role of habitat filtration.
CONCLUSIONS: This study revealed the different distribution pattern and assembly mechanism of Vibrio spp. between coral rich and poor areas, providing the background data for the research of Vibrio community in coral reef areas and may help the protection of coral reef at the biological level. The main reasons for the difference were different number and species of corals, environmental (e.g., temperature) and spatial factors. It reflected the strong interaction between Vibrio and corals, and provided a new perspective for the investigation of Vibrio in coral reef ecosystem.