ArticleEnvironmental microbiology2026
Spatial Partitioning of Microbial Functional Potential Suggests Complex Nitrogen Cycling in a Subterranean Estuary.
Article in Environmental microbiology, 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
Subterranean estuaries (STEs) are key bioreactors regulating the quantity and chemical composition of groundwater-derived nitrogen (N) reaching coastal ecosystems. Yet, the microbial controls on N-cycling within these groundwater-seawater mixing zones remain poorly understood. We investigated the spatio-temporal variations in microbial communities and their N-cycling potential within an alluvial Mediterranean STE with high N concentration. We explored changes in microbial abundance, heterotrophic activity, taxonomic composition, and the abundance of N-cycling genes across groundwater samples collected at several depths and distances from the shoreline in winter and summer. Microbial abundance, activity, and diversity varied strongly across hydrochemical zones according to physicochemistry and aquifer depth but showed limited seasonality. Functional predictions suggested a complex, spatially structured suite of N pathways encoded by diverse taxa occupying different STE zones, and quantitative-PCR revealed niche partitioning between ammonia-oxidizing archaea, prevalent in fresh-groundwater, and bacterial denitrifiers enriched in deep-saline layers. Multiple linear model predictions showed a stronger fit for NO
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