Anthropogenic activities and geographic locations regulate microbial diversity, community assembly and species sorting in Canadian and Indian freshwater lakes.

Autor: Obieze CC; Centre for Forest Research, Institute of Integrative Biology and Systems, Université Laval, Quebec, QC G1V0A6, Canada. Electronic address: nedukris@gmail.com., Wani GA; Centre for Forest Research, Institute of Integrative Biology and Systems, Université Laval, Quebec, QC G1V0A6, Canada; Department of Botany, University of Kashmir, Srinagar 190006, Jammu and Kashmir, India., Shah MA; Department of Botany, University of Kashmir, Srinagar 190006, Jammu and Kashmir, India., Reshi ZA; Department of Botany, University of Kashmir, Srinagar 190006, Jammu and Kashmir, India., Comeau AM; Integrated Microbiome Resource, Dalhousie University, Halifax, NS, Canada., Khasa DP; Centre for Forest Research, Institute of Integrative Biology and Systems and Canada Research Chair in Forest Genomics, Université Laval, Quebec, QC G1V0A6, Canada.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2022 Jun 20; Vol. 826, pp. 154292. Date of Electronic Publication: 2022 Mar 04.
DOI: 10.1016/j.scitotenv.2022.154292
Abstrakt: Freshwater lakes are important reservoirs and sources of drinking water globally. However, the microbiota, which supports the functionality of these ecosystems is threatened by the influx of nutrients, heavy metals and other toxic chemical substances from anthropogenic activities. The influence of these factors on the diversity, assembly mechanisms and co-occurrence patterns of bacterial communities in freshwater lakes is not clearly understood. Hence, samples were collected from six different impacted lakes in Canada and India and examined by 454-pyrosequencing technology. The trophic status of these lakes was determined using specific chemical parameters. Our results revealed that bacterial diversity and community composition was altered by both the lake water chemistry and geographic distance. Anthropogenic activities pervasively influenced species distribution. Dispersal limitation (32.3%), homogenous selection (31.8%) and drift (20%) accounted for the largest proportions of the bacterial community assembly mechanisms. Homogenous selection increased in lakes with higher nutrient concentration, while stochasticity reduced. Community functional profiles revealed that deterministic processes dominated the assembly mechanisms of phylotypes with higher potential for biodegradation, while stochasticity dominated the assembly of phylotypes with potential for antimicrobial resistance. Bacteroidota (44%) and Proteobacteria (34%) were the most abundant phyla. Co-occurrence network analysis revealed that complexity increased in more impacted lakes, while competition and the nature of anthropogenic activity contributed to species sorting. Overall, this study demonstrates that bacterial community changes in freshwater lakes are linked to anthropogenic activities, with corresponding consequences on the distribution of phylotypes of environmental and human health interest.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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