Reef environments shape microbial partners in a highly connected coral population
Reef environments shape microbial partners in a highly connected coral population
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DOI：
10.1098/rspb.2021.2459
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发表时间：
2020-10
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影响因子：
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通讯作者：
N. Kriefall;Matt Kanke;GV Aglyamova;S. Davies
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文献类型：
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作者：
N. Kriefall;Matt Kanke;GV Aglyamova;S. Davies
与那些来自温度变化较小的环境的珊瑚相比，来自温度变化较大的环境的珊瑚在热应力下往往表现得更好，这是一个重要的发现，因为海洋变暖威胁着全世界的珊瑚。越来越多的证据表明，珊瑚的耐热性可归因于珊瑚本身以及全息生物（珊瑚宿主及其相关微生物）内的微生物群落。然而，很少有研究描述了热变环境如何在原位结构多个全息生物成员。在这里，我们使用珊瑚的2b-RAD测序和藻类（ITS2）和细菌（16S）群落的元条形码，我们展示了在法属波利尼西亚高度联系的珊瑚种群（Acropora hyacinthus）中，珊瑚礁带（距离海岸、物理特征和环境可变性不同的区域）以不同规模结构藻类和细菌群落的证据。平均而言，前礁（更稳定）的藻类群落比后礁（更多变）更多样化，这表明可变性限制了藻类的多样性。相比之下，微生物群落的结构规模较小，具有特定地点的指示物种，并在整个珊瑚礁带中具有丰富的功能。我们的研究结果阐明了与独特微生物群落的关联如何依赖于高度分散的珊瑚种群的空间尺度，这可能在热分化地区和快速变化的海洋中具有适应性后果。
Corals from more thermally variable environments often fare better under thermal stress compared to those from less thermally variable environments, an important finding given that ocean warming threatens corals worldwide. Evidence is mounting that thermal tolerance can be attributed to the coral itself, as well as microbial communities present within the holobiont (coral host and its associated microorganisms). However, few studies have characterized how thermally variable environments structure multiple holobiont members in situ. Here, using 2b-RAD sequencing of the coral and metabarcoding of algal (ITS2) and bacterial (16S) communities, we show evidence that reef zones (locales differing in proximity to shore, physical characteristics, and environmental variability) structure algal and bacterial communities at different scales within a highly connected coral population (Acropora hyacinthus) in French Polynesia. Fore reef (more stable) algal communities were on average more diverse than the back reef (more variable), suggesting that variability constrains algal diversity. In contrast, microbial communities were structured on smaller scales with site-specific indicator species and enriched functions across reef zones. Our results illuminate how associations with unique microbial communities can depend on spatial scale across highly dispersive coral populations, which may have fitness consequences in thermally divergent regions and rapidly changing oceans.