Methane Hydrates and Related Phenomena

Beneath the seafloor, vast quantities of methane are locked inside ice-like structures called gas hydrates, and the microbial communities living in surrounding sediments—dominated largely by archaea—play a critical role in consuming that methane before it reaches the ocean and atmosphere. These microbes carry out anaerobic oxidation of methane, a process that couples methane breakdown to the reduction of compounds like sulfate or nitrite, effectively acting as a biological filter on one of the most potent greenhouse gases. Researchers are working to understand how different electron acceptors, particularly nitrite and nitrate, drive distinct oxidation pathways, and how the stability of gas hydrates under changing ocean temperatures may alter the scale and distribution of microbial activity. A central open question is how quickly these biogeochemical systems can respond to environmental disturbance—and whether microbial methane consumption can keep pace if hydrate deposits destabilize at larger scales.

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Keywords

Methane OxidationAnaerobicGas HydratesMicrobial CommunitiesSubseafloor SedimentsBiogeochemistry