Abstract
The structure, diversity and dynamics of microbial communities from a swallow hole draining agricultural land and two connected karst springs (Switzerland) were studied using molecular microbiological methods and related to hydrological and physicochemical parameters. Storm responses and an annual hydrological cycle were monitored to determine the short- and long-term variability, respectively, of bacterial communities. Statistical analysis of bacterial genetic fingerprints (16S rDNA PCR-DGGE) of spring water samples revealed several clusters that corresponded well with different levels of the allochthonous swallow hole contribution. Microbial communities in spring water samples highly affected by the swallow hole showed low similarities among them, reflecting the high temporal variability of the bacterial communities infiltrating at the swallow hole. Conversely, high similarities among samples with low allochthonous contribution provided evidence for a stable autochthonous endokarst microbial community. Three spring samples, representative for low, medium and high swallow hole contribution, were analysed by cloning/sequencing in order to identify the major bacterial groups in the communities. The autochthonous endokarst microbial community was mainly characterized of δ-Proteobacteria, Acidobacteria and Nitrospira species. A high percentage of unknown sequences suggested further that many karst aquifer bacteria are still undiscovered. Finally, the potential use of groundwater biomonitoring using microbial communities is discussed.
Résumé
La structure, la diversité et la dynamique des communautés microbiennes d’un aven et de deux résurgences associées en contexte agricole (Suisse) ont été étudiées par microbiologie moléculaire et mis en relation avec des paramètres hydrologiques et physico-chimiques. Un cycle hydrologique annuel complet, incluant les impacts d’orages, a été suivi afin de déterminer la variabilité à court et à long terme des communautés bactériennes. L’analyse statistique des signatures génétiques bactériennes (16S rDNA PCR-DGGE) des résurgences a mis en évidence plusieurs groupes correspondant à une contribution allochtone depuis l’aven. Les communautés microbiennes des eaux de source marquées par une forte contribution de l’aven ont montré peu de similitudes entre elles, soulignant ainsi une forte variabilité temporelle des populations bactériennes infiltrées. Réciproquement, les fortes similitudes observées entre les échantillons à faible composante allochtone mettent en évidence une communauté microbienne stable en provenance de l’endokarst. Trois échantillons d’eaux de source représentatifs de contributions allochtones faible, moyenne et forte ont été analysés par clonage/séquençage afin d’identifier les principaux groupes bactériens. La communauté microbienne autochtone de l’endokarst est principalement characterisé par des espèces δ- Proteobacteria, Acidobacteria et Nitrospira. De plus, l’existence d’un fort pourcentage de séquences inconnues suggère que nombre de bactéries karstiques restent à découvrir. En conclusion, l’utilisation potentielle des communautés microbiennes pour le suivi biologique des eaux souterraines est discutée.
Resumen
La estructura, diversidad y dinámica de las comunidades microbianas en una cavidad que drena tierras agrícolas y dos manantiales cársticos conectados (Suiza) han sido estudiados usando métodos microbiológicos moleculares y han sido relacionadas son los parámetros hidrológicos y físico-químicos. Las respuestas a tormentas y al ciclo hidrológico annual han sido monitoreadas para determinar la variabilidad de las comunidades bacterianas a corto y largo plazo, respectivamente. El análisis estadístico de las huellas genéticas de las bacterias (16S rDNA PCR-DGGE) a partir de muestras de agua de los manantiales revela agrupamientos que se corresponden bien con los diferentes niveles de la contribución alóctona de la cavidad drenante. Las comunidades microbianas en las muestras de agua de los manantiales que están fuertemente afectadas por la cavidad muestran bajas similitudes entre sí, lo que refleja la alta variabilidad temporal de las comunidades de bacterias que se infiltran en la cavidad. De forma inversa, las altas similitudes entre muestras con baja contribución alóctona provee evidencias de una comunidad microbiana endocárstica autóctona estable. Tres muestras de manantiales, representativas de baja, media y alta contribución de la cavidad fueron analizadas por medio de clonado y secuenciación para identificar los grupos bacterianos predominantes en las comunidades. La comunidad microbiana autóctona endocárstica está caracterizado principalmente de especies de δ-Proteobacteria, Acidobacteria y Nitrospira. El alto porcentaje da secuencias desconocidas sugiere que muchas bacterias del acuífero no han sido todavía descubiertas. Finalmente, se discute el uso potencial de las comunidades microbianas para el biomonitoreo de aguas subterráneas.
摘要
利用分子生物学中微生物学的方法研究了一个由农田排水形成的落水洞和两个相互连通的岩溶泉眼 (瑞士) 中的细菌群落的结构、多样性和动态, 并且与水文学和物理化学的参数相对比。而细菌群落的短期和长期变化分别通过监测其对暴风雨和年度水文循环的响应加以确定。通过对泉水样中细菌遗传指纹图谱的统计分析揭示了几种不同集群的存在, 且它们与外来落水洞的水量的贡献程度相关。泉水样品中, 受落水洞强烈影响的细菌群落相似性差, 反映了渗入落水洞的水其细菌群落具有极高的时间变异性。相反, 外来水贡献较小的水样中的细菌群落的相似性较高, 这说明了喀斯特原地的微生物群落较为稳定。为了识别各群落里主要的细菌种类, 文中选取了三个泉水样品的细菌进行克隆和基因测序, 分别代表落水洞补给水量较少、中等和较多的这三种情况。喀斯特地区本地内生的细菌群落主要由δ变型菌、嗜酸细菌和硝化螺菌组成。但一大部分未知的遗传序列表明喀斯特地区含水层仍有多数细菌未被发现。最后, 文章讨论了利用细菌群落来进行地下水生态监测的可能性。
Resumo
A estrutura, diversidade e dinâmica das comunidades microbiológicas de uma dolina que drena terrenos agrícolas e de duas nascentes cársicas conectadas (Suiça) foram estudadas utilizando métodos moleculares microbiológicos e relacionadas com parâmetros hidrológicos e físico-químicos. Respostas a tempestades e um ciclo hidrológico anual foram monitorizados para determinar a variabilidade de curto e longo prazo, respectivamente, das comunidades bacterianas. Análises estatísticas das impressões genéticas das bactérias (16S rDNA PCR-DGGE) de amostras de água das nascentes mostram vários grupos que têm correspondência com diferentes níveis de contribuição alóctone da dolina. As comunidades microbianas nas amostras de água das nascentes altamente afectadas pela dolina mostraram baixa similaridade entre elas, reflectindo a elevada variabilidade temporal das comunidades bacterianas que se infiltram na dolina. Pelo contrário, a elevada similaridade entre amostras com pouca contribuição alóctone mostram à evidência uma comunidade microbiana autóctone estável no endocarso. Três amostras de nascente, representativas de baixa, média e elevada contribuição da dolina, foram analisadas através de clonagem/sequenciação, de modo a identificar os principais grupos de bactérias nas comunidades. A comunidade microbiana autóctone do endocarso era fundamentalmente composta pelas espécies δ-Proteobacteria, Acidobacteria e Nitrospira. Uma elevada percentagem de sequências desconhecidas sugerem que muitas bactérias de aquíferos cársicos estão ainda por identificar. Finalmente, é discutido o uso potencial da biomonitorização da água subterranean utilizando as comunidades microbiológicas.
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Acknowledgements
We are grateful to the water works of Yverdon-les-Bains for their cooperation, and for technical and logistical support. We thank the Swiss National Science Foundation (project BEKARST/KARSTDYN, grant No. 200020–113609/1) for funding and the three reviewers for their valuable comments.
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Pronk, M., Goldscheider, N. & Zopfi, J. Microbial communities in karst groundwater and their potential use for biomonitoring. Hydrogeol J 17, 37–48 (2009). https://doi.org/10.1007/s10040-008-0350-x
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DOI: https://doi.org/10.1007/s10040-008-0350-x