Seagrass colonization alters sediment physicochemical properties by depositing seagrass fibers and releasing organic carbon and oxygen from the roots. How this seagrass colonization-induced spatial heterogeneity affects archaeal community structure and abundance remains unclear. In this study, we investigated archaeal abundance, diversity, and composition in both vegetated and adjacent bare surface sediments of a Zostera marina meadow. High-throughput sequencing of 16S rDNA showed that Woesearchaeota, Bathyarchaeota, and Thaumarchaeota were the most abundant phyla across all samples, accounting for approximately 42%, 21%, and 17% of the total archaeal communities, respectively. In terms of relative abundance, Woesearchaeota and Bathyarchaeota were not significantly different between these two niches; however, specific subclades (Woese-3, Woese-21, Bathy-6, Bathy-18) were significantly enriched in vegetated sediments (), while Thaumarchaeota was favored in unvegetated sites (). The quantification of archaeal 16S rRNA genes showed that the absolute abundance of the whole archaeal community, Bathyarchaeota, and Woese-3, Woese-10, Woese-13, and Woese-21 was significantly more abundant in vegetated sediments than in bare sediments (). Our study expands the available knowledge of the distribution patterns and niche preferences of archaea in seagrass systems, especially for the different subclades of Woesearchaeota and Bathyarchaeota, in terms of both relative proportions and absolute quantities.

中文翻译：

---

Zostera滨海草地上的古细菌群落结构和丰富度：海草定殖和裸露沉积物位点之间的比较。

海草定植通过沉积海草纤维并从根部释放有机碳和氧来改变沉积物的理化性质。这种海草定殖引起的空间异质性如何影响古细菌群落结构和丰度尚不清楚。在这项研究中，我们调查了Zostera滨海草甸的植被和邻近裸露表面沉积物中的古细菌丰度，多样性和组成。高通量的16S rDNA序列分析表明，Woesearchaeota，Bathyarchaeota和Thaumarchaeota是在所有样品中最丰富的门类，占约42％，21％，总古社区的17％，分别。就相对丰度而言Woesearchaeota和Bathyarchaeota没有这两个壁龛之间显著不同; 但是，特定的子系（Woese-3，Woese-21，Bathy-6，Bathy-18）明显富含植物沉积物（），而Thaumarchaeota在没有植被的地方受到青睐（）。对古细菌16S rRNA基因的定量分析表明，植被沉积物中整个古细菌群落， Bathyarchaeota和Woese-3，Woese-10，Woese-13和Woese-21的绝对丰度比裸露沉积物中的丰富得多（）。我们的研究扩展海草系统古的分布规律和特殊喜好的现有知识，特别是对不同的亚类型Woesearchaeota和Bathyarchaeota，在这两个相对比例和绝对数量方面。