The giant kelp Macrocystis pyrifera is categorized as a keystone species, forming highly productive forests that provide ecosystem services and host a remarkable marine biodiversity of macro and microorganisms. The association of microorganisms with the algae is close and can be functionally interdependent. The Magellan Strait, a natural marine passage between the Atlantic and Pacific oceans, harbours extensive giant kelp forests. However, information related to the diversity of bacterial communities in this region is still scarce. In this study, 16S rRNA gene metabarcoding was used to characterize the diversity and composition of bacterial communities associated with apical blades and sporophylls of M. pyrifera from different sites (Bahía Buzo, San Gregorio, and Buque Quemado). Additionally, data from satellites and reanalysis, as well as tide data, were used to characterize the environmental variability. The findings revealed discernible local variations in bacterial taxa across sampling sites, with consistent dominance of Proteobacteria, Verrucomicrobia, Bacteroidetes, and Planctomycetes. Furthermore, a distinctive bacterial community structure was identified between apical and sporophyll blades of M. pyrifera. This research marks the inaugural characterization of bacterial community diversity and composition associated with M. pyrifera in the remote and understudied sub‐Antarctic region of the Magellan Strait.

中文翻译：

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麦哲伦海峡巨型海带上的细菌群落：地理和地衣体内模式


巨型海带 Macrocystis pyrifera 被归类为关键物种，形成高产森林，提供生态系统服务，并拥有由大型和微生物组成的显着海洋生物多样性。微生物与藻类的关联是密切的，并且在功能上可以相互依赖。麦哲伦海峡是大西洋和太平洋之间的天然海洋通道，拥有广阔的巨型海带森林。然而，与该地区细菌群落多样性相关的信息仍然很少。在这项研究中，16S rRNA 基因宏条形码用于表征与来自不同地点 （Bahía Buzo、San Gregorio 和 Buque Quemado） 的 M. pyrifera 顶端叶片和孢子叶相关的细菌群落的多样性和组成。此外，来自卫星和再分析的数据以及潮汐数据被用来描述环境变化的特征。研究结果揭示了不同采样地点细菌分类群的明显局部差异，变形菌门、疣微菌门、拟杆菌门和浮霉菌门始终占主导地位。此外，在 M. pyrifera 的顶端和孢子叶叶片之间鉴定出独特的细菌群落结构。这项研究标志着在麦哲伦海峡偏远和研究不足的亚南极地区对与 M. pyrifera 相关的细菌群落多样性和组成进行了首次表征。