Functional and Structural Responses of Arctic and Alpine Soil Prokaryotic and Fungal Communities Under Freeze-Thaw Cycles of Different Frequencies

Frontiers in Microbiology
Carla Perez-MonAline Frossard

Abstract

Ongoing climate change involves increasing snow scarcity, which results in more frequent freeze-thaw cycles (FTCs) in polar and alpine soils. Although repeated FTCs have been shown to alter the structure and functions of soil microbial communities, a thorough understanding on the influence of FTCs frequency on polar and especially alpine soil microbiomes is still elusive. Here, we investigated the impact of repeated weekly vs. daily FTC frequencies on the structure and functions of prokaryotic and fungal communities from north- and south-exposed soils from two mountain ridges, one in the Arctic and one in the High-Alps. FTCs affected prokaryotic communities more strongly than fungal communities, where mainly cold-tolerant and opportunistic fungi (e.g., Mrakia, Mortierella) were responsive. Prokaryotic communities were more affected by weekly FTCs than by daily FTCs. Daily FTCs favored fast-growing bacteria (e.g., Arthrobacter), while oligotrophic and largely uncultured taxa (e.g., Verrucomicrobia) benefited from weekly FTCs. FTCs negatively affected microbial respiration but had minor impacts on C-, N- and P-acquiring enzymatic activities. Plausible pre-adaptation of the microbial communities to naturally occurring frequent FTC...Continue Reading

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Citations

Jun 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Agata BorowikJan Kucharski
Oct 6, 2021·The Science of the Total Environment·Carla Perez-MonBeat Frey

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Datasets Mentioned

BETA
PRJNA535397

Methods Mentioned

BETA
PCR
amplicon sequencing
RISA

Software Mentioned

ggplot2
indicspecies
vegan
PERMANOVAs
PERMANOVA
R Core Team
UPARSE
EcolUtils
MOTHUR
FungGuild

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