The findings were published in Nature Communications on March 9, 2026, in a paper titled Water mass specific genes dominate the Southern Ocean microbiome, led by Nicolas Cassar of Duke University as part of an international team.

A decade-long international effort maps the Antarctic Southern Ocean microbiome to understand its role in Earth's climate, highlighting the region's substantial heat and carbon uptake and the critical importance of microbial processes.

The study emphasizes that deciphering the genes controlling microbial functions is essential to predicting how the Southern Ocean will shape future climate, and it outlines plans to explore newly discovered genetic diversity.

Microbial communities in the Southern Ocean are not uniform; they form distinct ecosystems that are shaped by ocean circulation, with some organisms thriving in cold surface waters and others at greater depths.

DNA from water samples collected in a 2016–2017 expedition was sequenced and compared with existing gene catalogs, revealing that at least one-third of identified genes are not in current marine databases, indicating largely uncharacterized genetic territory.

Phytoplankton, a key microbial group, drives roughly half of the planet's photosynthesis and plays a major role in removing CO2 from the atmosphere, underscoring their central place in the carbon cycle.