ArticlebioRxiv : the preprint server for biology2026
Piezophilic activity dominates the Puerto Rico Trench deep subseafloor biosphere.
Article in bioRxiv : the preprint server for biology, 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
Hydrostatic pressure is a defining feature of the deep ocean, yet how it structures microbial activity across the subseafloor biosphere is poorly understood. Here, we assess pressure effects on anabolic activity in seafloor and subseafloor communities across a margin-to-hadal-to-abyssal transect of the Puerto Rico Trench region (493-8,385 m water depth). Community-level responses to pressure reverse with burial, revealing a previously unrecognized shift toward piezophily in resident subseafloor communities down to 20 meters below seafloor (mbsf). In pressure-incubation experiments, atmospheric pressure yielded higher proportions of active cells in surficial sediments, whereas
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