Stoichiometric Shifts in Soil C:N:P Promote Bacterial Taxa Dominance, Maintain Biodiversity, and Deconstruct Community Assemblages

Frontiers in Microbiology
Zachary T AanderudByron J Adams

Abstract

Imbalances in C:N:P supply ratios may cause bacterial resource limitations and constrain biogeochemical processes, but the importance of shifts in soil stoichiometry are complicated by the nearly limitless interactions between an immensely rich species pool and a multiple chemical resource forms. To more clearly identify the impact of soil C:N:P on bacteria, we evaluated the cumulative effects of single and coupled long-term nutrient additions (i.e., C as mannitol, N as equal concentrations NH4+ and NO3-, and P as Na3PO4) and water on communities in an Antarctic polar desert, Taylor Valley. Untreated soils possessed relatively low bacterial diversity, simplified organic C sources due to the absence of plants, limited inorganic N, and excess soil P potentially attenuating links between C:N:P. After 6 years of adding resources, an alleviation of C and N colimitation allowed one rare Micrococcaceae, an Arthrobacter species, to dominate, comprising 47% of the total community abundance and elevating soil respiration by 136% relative to untreated soils. The addition of N alone reduced C:N ratios, elevated bacterial richness and diversity, and allowed rare taxa relying on ammonium and nitrite for metabolism to become more abundant [e....Continue Reading

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Citations

Apr 26, 2019·Frontiers in Microbiology·Thomas D NiederbergerStephen Craig Cary
Nov 13, 2020·Frontiers in Microbiology·Elizabeth M OgataZachary T Aanderud
Sep 10, 2021·Microbial Ecology·Antonio Marcos Miranda SilvaElke Jurandy Bran Nogueira Cardoso

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Datasets Mentioned

BETA
PRJNA476992

Methods Mentioned

BETA
PCR

Software Mentioned

mothur
Gephi
PERMANOVA
gplot
R Development Core Team
SEED aligner
minerva
R
igraph
UCHIME

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