Next Article in Journal
Revisiting an Aspergillus flavus Strain Isolated from an Egyptian Sugarcane Field in 1930
Previous Article in Journal
A Multi-Omic Analysis for Low Bone Mineral Density in Postmenopausal Women Suggests a Relationship between Diet, Metabolites, and Microbiota
Article

Rapid Changes in Microbial Community Structures along a Meandering River

1
Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval, Laval, QC G1V 0A6, Canada
2
Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et Génie, Université Laval, Laval, QC G1V 0A6, Canada
3
Centre de Recherche en Aménagement et Développement (CRAD), Université Laval, Laval, QC G1V 0A6, Canada
4
Département de Biologie, Université Laval, Laval, QC G1V 0A6, Canada
5
Centre d’Études Nordiques, Université Laval, Laval, QC G1V 0A6, Canada
6
Department of Civil Engineering, University of Victoria, Victoria, BC V8P 5C2, Canada
7
École Supérieure d’Aménagement du Territoire et de Développement Régional (ESAD), Université Laval, Laval, QC G1V 0A6, Canada
8
Centre de Recherche de l’Institut Universitaire de Cardiologie et de Pneumologie de Québec, Ch Ste-Foy, QC G1V 0A6, Canada
*
Author to whom correspondence should be addressed.
Microorganisms 2020, 8(11), 1631; https://doi.org/10.3390/microorganisms8111631
Received: 10 October 2020 / Revised: 19 October 2020 / Accepted: 21 October 2020 / Published: 22 October 2020
(This article belongs to the Section Environmental Microbiology)
Streams and rivers convey freshwater from lands to the oceans, transporting various organic particles, minerals, and living organisms. Microbial communities are key components of freshwater food webs and take up, utilize, and transform this material. However, there are still important gaps in our understanding of the dynamic of these organisms along the river channels. Using high-throughput 16S and 18S rRNA gene sequencing and quantitative PCR on a 11-km long transect of the Saint-Charles River (Quebec, CA), starting from its main source, the Saint-Charles Lake, we show that bacterial and protist community structures in the river drifted quickly but progressively downstream of its source. The dominant Operational Taxonomic Units (OTUs) of the lake, notably related to Cyanobacteria, decreased in proportions, whereas relative proportions of other OTUs, such as a Pseudarcicella OTU, increased along the river course, becoming quickly predominant in the river system. Both prokaryotic and protist communities changed along the river transect, suggesting a strong impact of the shift from a stratified lake ecosystem to a continuously mixed river environment. This might reflect the cumulative effects of the increasing water turbulence, fluctuations of physicochemical conditions, differential predation pressure in the river, especially in the lake outlet by benthic filter feeders, or the relocation of microorganisms, through flocculation, sedimentation, resuspension, or inoculation from the watershed. Our study reveals that the transit of water in a river system can greatly impact both bacterial and micro-eukaryotic community composition, even over a short distance, and, potentially, the transformation of materials in the water column. View Full-Text
Keywords: freshwater; bacteria; protist; lotic; Cyanobacteria freshwater; bacteria; protist; lotic; Cyanobacteria
Show Figures

Figure 1

MDPI and ACS Style

Cruaud, P.; Vigneron, A.; Dorea, C.C.; Rodriguez, M.J.; Charette, S.J. Rapid Changes in Microbial Community Structures along a Meandering River. Microorganisms 2020, 8, 1631. https://doi.org/10.3390/microorganisms8111631

AMA Style

Cruaud P, Vigneron A, Dorea CC, Rodriguez MJ, Charette SJ. Rapid Changes in Microbial Community Structures along a Meandering River. Microorganisms. 2020; 8(11):1631. https://doi.org/10.3390/microorganisms8111631

Chicago/Turabian Style

Cruaud, Perrine, Adrien Vigneron, Caetano C. Dorea, Manuel J. Rodriguez, and Steve J. Charette. 2020. "Rapid Changes in Microbial Community Structures along a Meandering River" Microorganisms 8, no. 11: 1631. https://doi.org/10.3390/microorganisms8111631

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop