Department of Microbiology, Soochow University, Taipei 111, Taiwan.
Biodiversity Research Center, Academia Sinica, Taipei 115, Taiwan.
Sci Total Environ. 2024 Jan 10;907:167929. doi: 10.1016/j.scitotenv.2023.167929. Epub 2023 Oct 18.
Previous studies have demonstrated the influence of external factors (environmental factors and the coral host factors) on the community structure of coral-associated bacteria. However, the internal factors, e.g. the interaction within the bacterial community or bacteria itself, have often been overlooked in studies of the coral microbiome. Hence, we performed a reciprocal transplant of corals between two different climate zones to examine the resultant alterations in coral-associated bacterial communities. The findings highlight the significance of environmental factors, host selection, and highly resilient bacteria in shaping the coral microbial composition. The results support that coral species consistently harbor specific predominant bacterial groups influenced by host selection, while locations display unique bacterial taxa due to environmental variations. The transplantation of corals into new environments leads to a gradual shift in the bacterial community, from initially resembling that of the native location to eventually resembling that of the transplanted location, emphasizing the crucial role of bacterial community composition for coral survival under changing ambient conditions. Furthermore, highly resilient bacteria that persisted throughout the reciprocal transplant experiment demonstrated their adaptability to environmental and host changes, suggesting the presence of robust adaptation or resistance mechanisms in bacterial communities. Genetic adaptations within the prevalent bacterial group, Endozoicomonas, were also observed, suggesting variations in resilience and adaptation capabilities among different phylotypes. This study highlights the need to conduct further investigations into the coral-associated bacteria themselves, as they may hold some key insights into understanding the dynamics of coral-associated microbial communities. These data also highlight some key species of coral-associated bacteria which could benefit coral in response to alterations in ambient environment.
先前的研究已经证实了外部因素（环境因素和珊瑚宿主因素）对珊瑚相关细菌群落结构的影响。然而，在珊瑚微生物组的研究中，内部因素（例如细菌群落内部的相互作用或细菌本身）往往被忽视。因此，我们进行了珊瑚在两个不同气候带之间的相互移植实验，以研究珊瑚相关细菌群落的变化。研究结果强调了环境因素、宿主选择和高弹性细菌在塑造珊瑚微生物组成方面的重要性。研究结果表明，珊瑚物种确实始终存在受宿主选择影响的特定主要细菌群体，而地点则由于环境变化而显示出独特的细菌分类群。珊瑚被移植到新环境中会导致细菌群落逐渐发生变化，从最初类似于原生地的群落演替为最终类似于移植地的群落，这强调了在环境变化条件下细菌群落组成对于珊瑚生存的关键作用。此外，在整个相互移植实验中持续存在的高弹性细菌表明它们对环境和宿主变化具有适应性，这表明细菌群落中存在强大的适应或抵抗机制。还观察到流行细菌群体内共生单胞菌（Endozoicomonas）的遗传适应性，表明不同的生物型之间存在弹性和适应能力的差异。本研究强调需要对珊瑚相关细菌本身进行进一步研究，因为它们可能为理解珊瑚相关微生物群落的动态提供一些关键的见解。这些数据还突出了一些关键的珊瑚相关细菌物种，它们可能在应对环境变化时对珊瑚有益。
