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

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

Sci Total Environ

Centre for Forest Research, Institute of Integrative Biology and Systems and Canada Research Chair in Forest Genomics, Université Laval, Quebec, QC G1V0A6, Canada.

Published: June 2022

AI Article Synopsis

  • * A study involving six lakes in Canada and India used advanced sequencing technology to analyze how lake chemistry and geographic distance affect bacterial diversity and community composition, revealing that human activities significantly influence species distribution.
  • * Key findings indicated that specific processes (like homogenous selection) were involved in shaping bacterial communities, with higher nutrient levels leading to increased deterministic processes, and notable phyla like Bacteroidota and Proteobacteria dominating the assemblage, highlighting potential health implications.

Article Abstract

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.

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Source
http://dx.doi.org/10.1016/j.scitotenv.2022.154292DOI Listing

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