Disconnected from the energy of the sun, the permanently ice-covered Arctic deep sea receives miniscule amounts of organic matter that sustains life. Bacteria which can harvest the energy released from submarine hydrothermal sources could thus have an advantage. On research missions with the research vessel Polarstern, scientists from Germany found bacteria uniquely adapted to this geo-energy floating in deep-sea waters. They describe the role of these bacteria for biogeochemical cycling in the ocean.

Deep down in the ocean at tec­tonic plate bound­ar­ies, hot flu­ids rise from so-called hy­dro­thermal vents. The flu­ids are devoid of oxy­gen and con­tain large amounts of metals such as iron, man­ganese or cop­per. Some may also trans­port sulf­ides, meth­ane and hy­dro­gen. When the hot wa­ter mixes with the cold and oxy­gen­ated sur­round­ing sea­wa­ter, so-called hy­dro­thermal plumes de­velop con­tain­ing smoke-like particles of metal sulf­ide. These plumes rise hun­dreds of meters off the sea­floor and dis­perse thou­sands of kilo­met­ers away from their source. Hy­dro­thermal plumes might seem like a pre­cari­ous place to make your­self at home. However, that does not stop cer­tain bac­teria from flour­ish­ing just there, a study now pub­lished in Nature Microbiology finds.

Read more at: Max Planck Institute for Marine Microbiology

Enceladus black smoker at the Aurora Vent Field. (Photo Credit: HACON cruise 2021, REV Ocean)