Out of sight, but not out of season: Nitrifier distributions and population dynamics in a large oligotrophic lake

IF 4.3 2区 生物学 Q2 MICROBIOLOGY
Logan M. Peoples, Miranda H. Seixas, Kate A. Evans, Evan M. Bilbrey, John R. Ranieri, Tyler H. Tappenbeck, John E. Dore, Adam Baumann, Matthew J. Church
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Abstract

Nitrification is an important control on the form and distribution of nitrogen in freshwater ecosystems. However, the seasonality of nitrogen pools and the diversity of organisms catalyzing this process have not been well documented in oligotrophic lakes. Here, we show that nitrogen pools and nitrifying organisms in Flathead Lake are temporally and vertically dynamic, with nitrifiers displaying specific preferences depending on the season. While the ammonia-oxidizing bacteria (AOB) Nitrosomonadaceae and nitrite-oxidizing bacteria (NOB) Nitrotoga dominate at depth in the summer, the ammonia-oxidizing archaea (AOA) Nitrososphaerota and NOB Nitrospirota become abundant in the winter. Given clear seasonality in ammonium, with higher concentrations during the summer, we hypothesize that the succession between these two nitrifying groups may be due to nitrogen affinity, with AOB more competitive when ammonia concentrations are higher and AOA when they are lower. Nitrifiers in Flathead Lake share more than 99% average nucleotide identity with those reported in other North American lakes but are distinct from those in Europe and Asia, indicating a role for geographic isolation as a factor controlling speciation among nitrifiers. Our study shows there are seasonal shifts in nitrogen pools and nitrifying populations, highlighting the dynamic spatial and temporal nature of nitrogen cycling in freshwater ecosystems.

Abstract Image

Abstract Image

视线之外,但并非季节之外:一个大型寡营养湖中的硝化细菌分布和种群动态
硝化作用对淡水生态系统中氮的形式和分布具有重要的控制作用。然而,在寡营养湖泊中,氮库的季节性和催化这一过程的生物多样性还没有得到很好的记录。在这里,我们展示了平头湖中的氮库和硝化生物在时间和垂直方向上的动态变化,硝化生物根据季节的不同表现出特定的偏好。夏季,氨氧化细菌(AOB)Nitrosomonadaceae 和亚硝酸盐氧化细菌(NOB)Nitrotoga 在深度占主导地位,而氨氧化古细菌(AOA)Nitrososphaerota 和 NOB Nitrospirota 则在冬季大量出现。鉴于氨的季节性很明显,夏季氨的浓度较高,我们推测这两个硝化类群之间的演替可能是由于氮的亲和性造成的,当氨浓度较高时,AOB 的竞争力较强,而当氨浓度较低时,AOA 的竞争力较弱。平头湖中的硝化细菌与其他北美湖泊中的硝化细菌的平均核苷酸相同度超过 99%,但与欧洲和亚洲的硝化细菌不同,这表明地理隔离是控制硝化细菌物种分化的一个因素。我们的研究表明,氮库和硝化种群存在季节性变化,凸显了淡水生态系统氮循环的时空动态性质。
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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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