Response of coral bacterial composition and function to water quality variations under anthropogenic influence

珊瑚 全生物 生态学 生物 基因组 珊瑚礁 微生物群 群落结构 环境变化 微生物种群生物学 营养物 营养循环 气候变化 共生 细菌 遗传学 生物化学 生物信息学 基因
作者
Wentao Zhu,Xiangbo Liu,Junling Zhang,He Zhao,Zhuoran Li,Hao Wang,Rouwen Chen,Aimin Wang,Xiubao Li
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:884: 163837-163837 被引量:15
标识
DOI:10.1016/j.scitotenv.2023.163837
摘要

Microbial communities play key roles in the adaptation of corals living in adverse environments, as the microbiome flexibility can enhance environmental plasticity of coral holobiont. However, the ecological association of coral microbiome and related function to locally deteriorating water quality remains underexplored. In this work, we used 16S rRNA gene sequencing and quantitative microbial element cycling (QMEC) to investigate the seasonal changes of bacterial communities, particularly their functional genes related to carbon (C), nitrogen (N), phosphorus (P) and sulfur (S) cycle, of the scleractinian coral Galaxea fascicularis from nearshore reefs exposed anthropogenic influence. We used nutrient concentrations as the indicator of anthropogenic activities in coastal reefs, and found a higher nutrient pressure in spring than summer. The bacterial diversity, community structure and dominant bacteria of coral shifted significantly due to seasonal variations dominated by nutrient concentrations. Additionally, the network structure and nutrient cycling gene profiles in summer under low nutrient stress was distinct from that under poor environmental conditions in spring, with lower network complexity and abundance of CNPS cycling genes in summer compared with spring. We further identified significant correlations between microbial community (taxonomic composition and co-occurrence network) and geochemical functions (abundance of multiple functional genes and functional community). Nutrient enrichment was proved to be the most important environmental fluctuation in controlling the diversity, community structure, interactional network and functional genes of the coral microbiome. These results highlight that seasonal shifts in coral-associated bacteria due to anthropogenic activities alter the functional potentials, and provide novel insight about the mechanisms of coral adaptation to locally deteriorating environments.
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