Dynamics of Viral Abundance and Diversity in a Sphagnum-Dominated Peatland: Temporal Fluctuations Prevail Over Habitat

Frontiers in Microbiology
Flore BallaudAchim Quaiser

Abstract

Viruses impact microbial activity and carbon cycling in various environments, but their diversity and ecological importance in Sphagnum-peatlands are unknown. Abundances of viral particles and prokaryotes were monitored bi-monthly at a fen and a bog at two different layers of the peat surface. Viral particle abundance ranged from 1.7 x 10(6) to 5.6 x 10(8) particles mL(-1), and did not differ between fen and bog but showed seasonal fluctuations. These fluctuations were positively correlated with prokaryote abundance and dissolved organic carbon, and negatively correlated with water-table height and dissolved oxygen. Using shotgun metagenomics we observed a shift in viral diversity between winter/spring and summer/autumn, indicating a seasonal succession of viral communities, mainly driven by weather-related environmental changes. Based on the seasonal asynchrony between viral and microbial diversity, we hypothesize a seasonal shift in the active microbial communities associated with a shift from lysogenic to lytic lifestyles. Our results suggest that temporal variations of environmental conditions rather than current habitat differences control the dynamics of virus-host interactions in Sphagnum-dominated peatlands.

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Citations

Sep 16, 2018·Applied and Environmental Microbiology·Joshua M A StoughSteven W Wilhelm
Jun 28, 2019·Applied Microbiology and Biotechnology·Carmen Astudillo-GarcíaGavin Lear
Aug 11, 2021·Nature Reviews. Microbiology·Anne ChevallereauEdze R Westra

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Datasets Mentioned

BETA
PRJEB11420
PRJEB11421

Methods Mentioned

BETA
flow cytometry
PCA

Software Mentioned

Compareads
EST
Meta
RNA
Roche
tRNAscan
Galaxy
R
MOTHUR
Genouest

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