New research reveals that life beneath the surface of one of the driest places on Earth is far more resilient and diverse than many scientists expected. An international team led by the University of Cologne studied tiny soil worms known as nematodes in Chile’s Atacama Desert. Often compared to polar deserts, the Atacama is considered one of the most arid regions in the world. With almost no rainfall, high salt levels in the soil, and dramatic temperature swings, it ranks among the planet’s most extreme environments.
Despite these punishing conditions, researchers found thriving communities of nematodes. Specialists in zoology, ecology, and botany worked together to uncover how different species manage to survive there. Their findings, published in Nature Communications under the title “Geographic distribution of nematodes in the Atacama is associated with elevation, climate gradients and parthenogenesis,” provide new insight into how biodiversity patterns are shaped by environmental factors across a landscape.
Why Nematodes Matter in Soil Ecosystems
Nematodes are among the most widespread and numerous animals in soil ecosystems. With countless species worldwide, they play a vital role in maintaining ecological balance. These microscopic organisms help control bacterial populations, support nutrient cycling, and serve as indicators of soil health.
They are also remarkably adaptable. Nematodes can be found in deep ocean sediments, Arctic environments, and even highly saline soils. Their ability to endure such extremes makes them ideal organisms for studying how life persists under environmental stress.
“Soils are important for the performance of an ecosystem, for example for carbon storage and nutrient supply. This is why understanding the organisms, i.e. not microbes, but multicellular animals, that live there is so important,” says Dr Philipp Schiffer from the University of Cologne’s Institute of Zoology and one of the authors of the study. “Data on soils in extreme ecosystems such as the Atacama Desert is still scarce.”
Studying Life at the Dry Limit
The team is part of the Collaborative Research Centre 1211 “Earth — Evolution at the Dry Limit,” which has conducted long-term research in the Atacama. For this project, scientists examined six distinct regions, each with different environmental conditions. These included higher elevation areas with more moisture and vegetation, highly saline zones exposed to intense UV radiation, and fog-fed oases where plant life flourishes against the odds.
Researchers collected soil samples from sand dunes, salt flats, riverbeds, and mountainous terrain. They analyzed biodiversity, reproductive strategies, and population structures among the nematodes living in each environment.
Asexual Reproduction and Survival in Extreme Drought
Clear differences emerged across locations. At higher elevations, many nematode species reproduce asexually. This finding lends support to a long-standing but previously unconfirmed idea that asexual reproduction may offer advantages in extreme environments.
Biodiversity also followed moisture patterns. Areas that received more precipitation supported a greater variety of species. Temperature differences further influenced which nematode communities could survive in specific regions.
What This Means for Climate Change and Arid Regions
The results demonstrate that stable and resilient soil ecosystems can exist even in remote and severely dry landscapes. This suggests that other arid regions around the world may harbor more biodiversity than previously recognized.
At the same time, the research highlights potential risks. “In some of the examined regions, simplified food webs indicate that these ecosystems are already damaged and may therefore be more susceptible to disruptions.” Fragile systems with fewer ecological connections may struggle to withstand additional environmental stress.
“In light of increasing global aridity, which is affecting more and more regions worldwide, these results are becoming increasingly relevant. Understanding how organisms adapt in extreme environments and which environmental parameters cause them to spread can help to improve estimation of the ecological consequences of climate change,” says Schiffer.
The findings also show that broad ecological patterns, such as precipitation gradients and the influence of altitude, remain detectable even under extreme conditions and can be observed at the genetic level. Overall, the study marks an important step toward understanding how soil organisms respond to environmental change on a global scale.
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