By Abbas Nazil
Scientists have discovered that ants may play a far greater role in Earth’s carbon cycle than previously understood, with new research showing that their underground activities significantly affect both carbon storage in soils and carbon dioxide emissions into the atmosphere.
The findings, published in Nature Communications, suggest that ant colonies are quietly reshaping ecosystems across the planet by altering the way carbon moves through soil environments.
Researchers from Northwest A&F University and collaborating institutions analyzed more than 2,200 measurements collected from 136 studies covering deserts, forests, grasslands, croplands, wetlands, and other ecosystems around the world.
The study found that soils surrounding ant nests contained 22 percent more organic carbon than nearby soils untouched by ants.
At the same time, ant nests released 84 percent more carbon dioxide into the atmosphere compared to surrounding ground.
Scientists said this dual role makes ants both carbon builders and carbon emitters, creating a complicated balance that could influence future climate models.
Researchers estimate that roughly 20 quadrillion ants currently inhabit Earth, giving them a combined biomass equal to nearly one-fifth of the total mass of all humans.
Their constant digging, tunneling, hauling of leaves, seeds, dead insects, and organic materials causes major changes beneath the soil surface.
According to the study, about 52 percent of the additional carbon dioxide emitted from ant nests comes directly from the ants’ own respiration.
Scientists reached this conclusion by comparing live field nests with laboratory soil samples taken from nests after ants had been removed.
Field nests showed a 123 percent increase in carbon dioxide emissions, while soil-only samples still showed emissions 55 percent higher than normal soils.
Researchers said the difference reflects carbon dioxide released directly by the ants themselves through breathing.
The study revealed that the impact of ants varies widely depending on climate, soil conditions, species type, and nesting behavior.
The strongest effects on carbon storage were recorded in dry and nutrient-poor regions.
In arid environments, ants increased soil carbon storage by 44 percent, while desert ecosystems experienced gains as high as 74 percent.
By comparison, wetter ecosystems showed smaller increases because they already contain larger amounts of naturally stored carbon.
Scientists believe ant colonies create localized nutrient-rich hotspots in deserts by concentrating plant material and organic debris in a single area.
These underground storage zones can act as miniature oases within otherwise poor soils.
The study also found that different ant species affect ecosystems in unique ways.
Species from groups such as Formica, Pheidole, and Pogonomyrmex were among the strongest contributors to both carbon storage and emissions.
Researchers noted that ants feeding on sugary plant secretions or seeds tend to accumulate more plant material inside nests, which fuels microbial activity and increases carbon cycling.
Predatory ants, meanwhile, alter soil chemistry differently by storing nitrogen-rich animal remains underground.
Nest construction methods also influenced carbon behavior.
Aboveground nests made from plant debris increased soil carbon levels by about 36 percent, while underground nests pushed organic material deeper into the soil profile.
Some mineral-based nests had little or even negative effects on carbon storage because they consisted mainly of deeper soil layers brought to the surface.
Climate conditions were identified as another major factor shaping ant-driven carbon changes.
Temperature and rainfall determine which ant species dominate an area, what they consume, and how they build nests.
Scientists warned that rising global temperatures are already allowing ants to expand into wetlands, colder regions, and low-disturbance agricultural areas.
As warming continues, researchers expect ant populations to grow further and spread into new ecosystems.
The study emphasized that several important gaps remain in current scientific understanding.
Large parts of Africa, South America, and Australia, which contain some of the world’s richest ant diversity, remain poorly studied.
Researchers also noted that most existing studies measured either carbon storage or carbon emissions separately rather than tracking both processes simultaneously at the same locations.
Despite these uncertainties, scientists said the findings suggest ants deserve greater attention in global climate and soil models.
Researchers argued that ant nests should no longer be treated as minor ecological features because they are capable of moving significant amounts of carbon in and out of the soil.
The study concluded that as ant populations continue expanding under climate change, their influence on global carbon cycling may become increasingly important for understanding future environmental conditions and climate forecasts.