Cable bacteria colonise new sediment environments through water column dispersal

IF 4.3 2区 生物学 Q2 MICROBIOLOGY Environmental microbiology Pub Date : 2024-10-16 DOI:10.1111/1462-2920.16694
Jesper R. van Dijk, Jeanine S. Geelhoed, Philip Ley, Silvia Hidalgo-Martinez, Miguel Portillo-Estrada, Erik Verbruggen, Filip J. R. Meysman
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Abstract

Cable bacteria exhibit a unique metabolism involving long-distance electron transport, significantly impacting elemental cycling in various sediments. These long filamentous bacteria are distributed circumglobally, suggesting an effective mode of dispersal. However, oxygen strongly inhibits their activity, posing a challenge to their dispersal through the water column. We investigated the effective dispersal of marine cable bacteria in a compartmentalised microcosm experiment. Cable bacteria were grown in natural ‘source’ sediment, and their metabolic activity was recorded in autoclaved ‘destination’ cores, which were only accessible through oxygenated seawater. Colonisation occurred over weeks, and destination cores contained only one cable bacterium strain. Filament ‘snippets’ (fragments with a median size of ~15 cells) accumulated in the microcosm water, with about 30% of snippets attached to sediment particles. Snippet release was also observed in situ in a salt marsh creek. This provides a model for the dispersal of cable bacteria through oxygenated water: snippets are formed by filament breakage in the sediment, released into the overlying water and transported with sediment particles that likely offer protection. These insights are informative for broader theories on microbial community assembly and prokaryotic biogeography in marine sediments.

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缆索细菌通过水柱传播定殖新的沉积物环境
缆索细菌展示了一种涉及长距离电子传输的独特新陈代谢,对各种沉积物中的元素循环产生了重大影响。这些长丝状细菌分布在全球各地,这表明它们具有有效的传播方式。然而,氧气强烈抑制了它们的活动,给它们在水体中的扩散带来了挑战。我们在分区微观世界实验中研究了海洋缆索细菌的有效扩散。缆索细菌在天然 "源 "沉积物中生长,在高压灭菌的 "目的 "岩芯中记录它们的代谢活动,只有通过含氧海水才能进入这些岩芯。定殖过程持续数周,目的岩芯只含有一种缆索细菌菌株。丝状物'片段'(中值大小约为 15 个细胞的碎片)在微观世界水中积累,约 30% 的片段附着在沉积物颗粒上。在盐沼小溪中也观察到了片段释放。这为缆索细菌在含氧水中的传播提供了一个模型:片段由沉积物中的菌丝断裂形成,释放到上覆水中,并与沉积物颗粒一起运输,而沉积物颗粒可能提供保护。这些见解对海洋沉积物中微生物群落组装和原核生物地理学的广泛理论具有启发意义。
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来源期刊
Environmental microbiology
Environmental microbiology 环境科学-微生物学
CiteScore
9.90
自引率
3.90%
发文量
427
审稿时长
2.3 months
期刊介绍: Environmental Microbiology provides a high profile vehicle for publication of the most innovative, original and rigorous research in the field. The scope of the Journal encompasses the diversity of current research on microbial processes in the environment, microbial communities, interactions and evolution and includes, but is not limited to, the following: the structure, activities and communal behaviour of microbial communities microbial community genetics and evolutionary processes microbial symbioses, microbial interactions and interactions with plants, animals and abiotic factors microbes in the tree of life, microbial diversification and evolution population biology and clonal structure microbial metabolic and structural diversity microbial physiology, growth and survival microbes and surfaces, adhesion and biofouling responses to environmental signals and stress factors modelling and theory development pollution microbiology extremophiles and life in extreme and unusual little-explored habitats element cycles and biogeochemical processes, primary and secondary production microbes in a changing world, microbially-influenced global changes evolution and diversity of archaeal and bacterial viruses new technological developments in microbial ecology and evolution, in particular for the study of activities of microbial communities, non-culturable microorganisms and emerging pathogens
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