Impact of Top-Down Regulation on the Growth Efficiency of Freshwater Bacterioplankton.

IF 4.1 2区 生物学 Q2 MICROBIOLOGY
Angia Sriram Pradeep Ram, Hermine Billard, Fanny Perriere, Olivier Voldoire, Jonathan Colombet
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引用次数: 0

Abstract

To investigate the hypothesis of top-down control by viruses and heterotrophic nanoflagellates on bacterial-mediated carbon fluxes in freshwater systems, a year-long study (2023-2024) was conducted in the pelagic zone of Lake Saint-Gervais (France). The variability in BGE (9.9% to 45.5%) was attributed to the decoupling of production and respiration, providing bacterioplankton communities with a competitive advantage in adapting to fluctuating environmental disturbances in freshwater systems. The high nucleic acid (HNA) bacterial community, the active fraction, contributed the most to bacterial production and was linked to BGE estimates. Weak bottom-up controls (nutrient concentrations and stoichiometry) on BGE suggested a stronger role for mortality forces. Among viral subgroups (VLP1-VLP4) identified via flow cytometry, the dominant low-fluorescence DNA VLP1 subgroup (range = 0.7 to 3.1 × 108 VLP mL-1) accounting for the majority of viral production was closely linked to the HNA population. Both top-down forces exerted antagonistic effects on BGE at the community level. The preferential lysis and grazing of the susceptible HNA population, which stimulated bacterial community respiration more than production in the non-target population, resulted in reduced BGE. These results underscore the key role of top-down processes in shaping carbon flux through bacterioplankton in this freshwater system.

自上而下的调节对淡水浮游细菌生长效率的影响
为了研究病毒和异养纳米鞭毛虫对淡水系统中细菌介导的碳通量进行自上而下控制的假说,我们在圣热尔韦湖(法国)的浮游区进行了为期一年(2023-2024 年)的研究。BGE 的变化(9.9% 到 45.5%)归因于生产和呼吸的脱钩,为浮游细菌群落提供了适应淡水系统中波动环境干扰的竞争优势。高核酸(HNA)细菌群落是活跃的部分,对细菌生产的贡献最大,并与 BGE 估计值相关。自下而上的控制(营养浓度和化学计量)对 BGE 的影响较弱,这表明死亡率的作用更大。在通过流式细胞术确定的病毒亚群(VLP1-VLP4)中,低荧光 DNA VLP1 亚群(范围 = 0.7 至 3.1 × 108 VLP mL-1)占病毒产量的绝大部分,与 HNA 群体密切相关。这两种自上而下的力量在群落水平上对 BGE 产生了拮抗作用。对易感 HNA 群体的优先裂解和掠食刺激了细菌群落的呼吸作用,而非目标群体的呼吸作用则促进了病毒的产生,从而导致 BGE 的减少。这些结果突出表明,在这一淡水系统中,自上而下的过程在通过浮游细菌形成碳通量方面起着关键作用。
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来源期刊
Microorganisms
Microorganisms Medicine-Microbiology (medical)
CiteScore
7.40
自引率
6.70%
发文量
2168
审稿时长
20.03 days
期刊介绍: Microorganisms (ISSN 2076-2607) is an international, peer-reviewed open access journal which provides an advanced forum for studies related to prokaryotic and eukaryotic microorganisms, viruses and prions. It publishes reviews, research papers and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation or experimental procedure, if unable to be published in a normal way, can be deposited as supplementary electronic material.
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