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This research aims to understand the interactions between mobilized dissolved organic matter (DOM) and microbial communities in beach sediments.

March 19, 2026BiogeochemistryOpen Access

Mobilized dissolved organic matter provides niche space for prokaryotes in the deep subterranean estuary of a sandy beach

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This research aims to understand the interactions between mobilized dissolved organic matter (DOM) and microbial communities in beach sediments.
Analyzed two 24-m-long sediment cores from the high-energy beach of Spiekeroog Island, Germany.
Measured concentrations of mobilizable DOM in relation to in-situ groundwater levels.
Used ultrahigh-resolution mass spectrometry to characterize the molecular composition of DOM.
Performed cluster analyses to identify relationships between DOM compounds and prokaryotic taxa.
Applied 16S rRNA gene sequencing for microbial community differentiation.
Mobilizable DOM concentrations were approximately 16 times higher than groundwater concentrations.
Identified distinct groups of DOM that correlated with specific prokaryotic taxa.
Aerobic taxa predominated in oxic zones, associated with labile nitrogen-rich DOM.
Anaerobic taxa were linked to more recalcitrant DOM compounds found in deeper sediments.
Findings suggest mobilized DOM plays a crucial role in niche differentiation among microbial communities.

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Analysis of DOM-microbe interactions reveals niche differentiation in prokaryotic communities.

Abarike et al. (2026) studied this question.

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