Corals harbor a great diversity of symbiotic microorganisms that play pivotal roles in host nutrition, reproduction, and development. Changes in the ocean environment, such as increasing exposure to artificial light at night (ALAN), may alter these relationships and result in a decline in coral health. In this study, we examined the microbiome associated with gravid specimens of the reef-building coral Acropora digitifera. We also assessed the temporal effects of ALAN on the coral-associated microbial community using high-throughput sequencing of the 16S rRNA gene V4 hypervariable region. The A. digitifera microbial community was dominated by phyla Proteobacteria, Firmicutes, and Bacteroidetes. Exposure to ALAN had no large-scale effect on the coral microbiome, although taxa affiliated with Rhodobacteraceae, Caulobacteraceae, Burkholderiaceae, Lachnospiraceae, and Ruminococcaceae were significantly enriched in corals subjected to ALAN. We further noted an increase in the relative abundance of the family Endozoicomonadaceae (Endozoicomonas) as the spawning period approached, regardless of light treatment. These findings highlight the stability of the A. digitifera microbial community under short-term artificial light pollution and provide initial insights into the response of the collective holobiont to ALAN.

中文翻译：

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在短期的人工光污染下，棘指藻的原核微生物组是稳定的。

珊瑚具有多种共生微生物，它们在宿主营养，繁殖和发育中起关键作用。海洋环境的变化，例如增加夜间对人造光的接触，可能会改变这些关系，并导致珊瑚健康下降。在这项研究中，我们检查了与礁石建造的珊瑚指藻（Acropora digitifera）的妊娠标本相关的微生物组。我们还使用16S rRNA基因V4高变区的高通量测序评估了ALAN对珊瑚相关微生物群落的时间影响。该A. digitifera菌群主要由门的Proteobacteria，Firmicutes和Bacteroidetes组成。暴露于ALAN对珊瑚的微生物组没有大的影响，尽管与红细菌科，杆状杆菌科，伯克霍尔德科，唇螺科和鲁米科科相关的类群在经过ALAN处理的珊瑚中明显丰富。我们进一步注意到，随着产卵期的临近，不论光照处理如何，Endozoicomonadaceae（Endozoicomonas）科的相对丰度都有所增加。这些发现强调了稳定性A. digitifera微生物群落在短期人造光污染，并提供初步分析上市公司集体holobiont艾伦的响应。