ArticleISME communications2026
Phosphorus availability mediates pathway-specific nitrogen cycling in stratified peatland microbiomes.
Article in ISME communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Peatland microbiomes regulate nitrogen (N) cycling processes that control nutrient retention and greenhouse gas emissions in carbon-rich ecosystems. Although depth-driven redox gradients structure microbial communities, how physicochemical stratification shapes the functional versus taxonomic organization of N-cycling microorganisms remains unclear. We used shotgun metagenomics to characterize N-cycling gene distributions, taxonomic affiliations, and metagenome-assembled genomes (MAGs) across depth and vegetation gradients in a temperate blanket bog. Depth emerged as the primary structuring factor, creating functional-taxonomic decoupling. Surface peat (0-20 cm) harbored functionally diverse but taxonomically constrained communities assembled deterministically around nitrification and labile N acquisition, while subsurface peat (20-40 cm) supported taxonomically richer but functionally-simpler communities assembled stochastically and enriched in denitrification and dissimilatory nitrate reduction. Linear mixed-effects models revealed pathway-specific controls on N cycling. Denitrification increased with depth (β = 11.53,
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