A new study published in *Nature* identifies a specific group of deep-sea microbes, archaea, as significant contributors to methane emissions in the Arctic Ocean. Methane, a potent greenhouse gas, is trapped in vast reserves under the Arctic seabed. With warming temperatures, this methane is increasingly being released into the ocean and atmosphere.
Scientists have long understood that some microbes consume methane, preventing it from reaching the atmosphere. However, the new research highlights that certain archaea, belonging to the Bathyarchaeota phylum, are not just consuming methane but also producing it, effectively reversing the process. These archaea were found to thrive in deep-sea sediments devoid of oxygen.
The study involved collecting sediment samples from the Arctic Ocean and using advanced genomic sequencing and metabolic analysis to understand the archaea’s activities. The findings revealed that these archaea break down organic matter and, through a specific metabolic pathway, generate methane as a byproduct.
This discovery challenges previous assumptions about methane production in the Arctic Ocean and suggests that microbial activity could play a more complex role in greenhouse gas emissions than previously understood. The scientists emphasize the need for further research to quantify the overall impact of these methane-producing archaea on Arctic methane release and its implications for climate change.
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