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Secrets of the Ocean’s Twilight Zone: A New Discovery Sheds Light

Ocean’s Twilight Zone: Scientists from the International Oceanographic Institute (IOI) have announced the discovery of a previously unknown deep-sea microbial community, which could profoundly improve our comprehension of marine ecosystems and contribute to research into climate change.

photo of bubbles underwater
Photo by Berend de Kort on

Dr. Marina Novak led a team of deep-sea explorers between 2021 and 2023 that used advanced underwater technology to investigate the mesopelagic or “Ocean’s Twilight Zone”, situated between 200-1,000 meters below the surface. This region of Ocean’s Twilight Zone has long remained mysterious to researchers due to its limited accessibility and harsh conditions.

The newly discovered microorganism community known as “Abyssopelagica” is believed to be among the most diverse and dense ever discovered in deep sea. According to Real Science’s findings, this community is dominated by previously unknown bacteria and archaea which have evolved to survive under extreme pressures and low light conditions of the twilight zone.

Dr. Novak and her team were able to collect samples of the Abyssopelagica community using advanced deep-sea submersibles, enabling them to conduct detailed genetic analyses. They discovered that microorganisms within this community possess unique metabolic pathways which allow them to convert organic matter from dead marine organisms into energy and essential nutrients.

This discovery has profound implications for our understanding of the global carbon cycle. The ocean plays a key role in controlling Earth’s climate by absorbing and storing large amounts of atmospheric CO2. By discovering this microbial community, scientists may gain a better insight into how deep-sea ecosystems contribute to this process.

“Uncovering the secrets of this hidden microbial world offers us invaluable insights into the delicate balance between life in the deep sea,” Dr. Novak noted. “Knowing how these microorganisms contribute to carbon cycling could be a game-changer in our efforts to combat climate change.”

The discovery of the Abyssopelagica community offers researchers a new window into deep-sea ecosystem resilience to human-induced disturbances. As the world grapples with climate change, pollution, and overfishing, understanding these stressesors on the deep sea becomes ever more important.

The IOI team is currently organizing a series of follow-up expeditions to further investigate the Abyssopelagica community and its interactions with other marine organisms. These endeavors will be essential for informing conservation strategies, global climate change mitigation efforts, as well as uncovering more of the captivating secrets hidden deep within the ocean’s depths.

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