Functional guilds and drivers of diversity in seaweed-associated bacteria

Tahsin Khan, Weizhi Song, J. Nappi, E. Marzinelli, S. Egan, Torsten Thomas
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Abstract

Comparisons of functional and taxonomic profiles from bacterial communities in different habitats have suggested the existence of functional guilds composed of taxonomically or phylogenetically distinct members. Such guild membership is, however, rarely defined and the factors that drive functional diversity in bacteria remain poorly understood. We used seaweed-associated bacteria as a model to shed light on these important aspects of community ecology. Using a large dataset of over 1300 metagenome-assembled genomes from 13 seaweed species we found substantial overlap in the functionality of bacteria coming from distinct taxa, thus supporting the existence of functional guilds. This functional equivalence between different taxa was particularly pronounced when only functions involved in carbohydrate-degradation were considered. We further found that bacterial taxonomy is the dominant driver of functional differences between bacteria and that seaweed species or seaweed type (i.e. brown, red and green) had relatively stronger impacts on genome functionality for carbohydrate-degradation functions when compared to all other cellular functions. This study provides new insight into the factors underpinning the functional diversity of bacteria and contributes to our understanding how community function is generated from individual members.
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海藻相关细菌的功能区和多样性驱动因素
对不同生境中细菌群落的功能和分类学特征进行比较后发现,存在着由分类学或系统发育上不同的成员组成的功能行会。然而,这种行会成员资格很少得到界定,而且人们对驱动细菌功能多样性的因素仍然知之甚少。我们以海藻相关细菌为模型来揭示群落生态学的这些重要方面。我们利用一个由 13 个海藻物种的 1300 多个元基因组组装而成的大型数据集,发现来自不同类群的细菌在功能上存在大量重叠,从而支持了功能行会的存在。如果只考虑涉及碳水化合物降解的功能,不同类群之间的功能等同性尤为明显。我们进一步发现,细菌分类学是细菌间功能差异的主要驱动因素,与所有其他细胞功能相比,海藻物种或海藻类型(即棕色、红色和绿色)对碳水化合物降解功能基因组功能的影响相对更大。这项研究为我们了解细菌功能多样性的基础因素提供了新的视角,有助于我们理解群体功能是如何从个体成员中产生的。
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来源期刊
CiteScore
3.30
自引率
0.00%
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0
审稿时长
15 weeks
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