At 325 metres above the ground, on the uppermost platform of the ATTO tower (Amazon Tall Tower Observatory) in the heart of the Brazilian Amazon, the air is anything but empty. Far above the forest canopy it behaves more like a biological soup, and Brazilian scientists have now described a living ecosystem of microorganisms riding the droplets of the early morning fog. The finding overturns the assumption that the upper layers of the Amazonian atmosphere are chemically pure and essentially sterile. What the researchers found instead is a dense dispersal network of living fungi and bacteria suspended hundreds of metres above the treetops.
As reported by the Brazilian outlet G1 in its Terra da Gente section, the research was led by professor Ricardo Godói, of the Federal University of Paraná (UFPR), together with researcher Bruna Sebben. The team installed equipment on the tower to capture air and fog particles and identified thousands of lineages of bacteria and fungi. Among them are familiar species such as Serratia marcescens and Aspergillus niger, organisms that until now were believed to be confined to the leaf litter, the decomposing layer that carpets the forest floor and works as the main nutrient recycler of the rainforest.
The biological elevator of the forest
The researchers gave the phenomenon a name that explains itself: the biological elevator. The forest does not merely trade gases with the atmosphere, it also pushes life upward. The mechanism is both delicate and powerful. As wind brushes against leaf surfaces and the ground, it tears loose fungal spores and bacterial cells that stay suspended in the air. When the air mass cools overnight, water vapour condenses around those scattered particles and forms the fog droplets. Each droplet effectively becomes a microscopic vehicle.
That transport is far from marginal. Measurements taken at the tower indicate that Amazonian morning fog multiplies the concentration of bioaerosols in the upper atmosphere by up to ten times compared with what is recorded on dry days. In other words, the same phenomenon that wraps the rainforest in a white blanket at dawn works as a conveyor belt, lifting entire microbial communities from the ground to altitudes where winds can carry them long distances before rain brings them back down.
Clouds born out of living matter
The climate significance of the discovery is considerable, because those biological particles are not simply drifting along. Once they reach the higher layers they act as condensation nuclei, the physical seed around which water vapour gathers to form raindrops. Researchers estimate that roughly 60% of the particles that trigger cloud formation over the Amazon are biological in origin. The forest, put plainly, manufactures a large share of its own rainfall, and it does so using living matter produced on its own floor.
The cycle closes when it rains. Falling water returns to the forest the microorganisms and the nutrients that the fog had lifted, spreading them across areas different from those where they were first picked up. That silent redistribution helps sustain the fertility of an ecosystem that, paradoxically, sits on poor soils. The warning from the research team is blunt: in degraded or deforested areas the process is interrupted, the distribution of microorganisms changes and the functioning of the whole system is compromised. What is lost is not only the tree, but also the invisible machinery that makes the rain.
A tower taller than the Eiffel Tower
None of this would have been observable without the infrastructure that made the study possible. The ATTO tower, inaugurated in 2015, is the result of scientific cooperation between Brazil and Germany and stands in an area of continuous forest with minimal human interference. At 325 metres it rises above the height of the Eiffel Tower and allows decades of continuous monitoring of air chemistry and of the exchanges between forest and atmosphere. From its top platform the view is an unbroken green sea running to the horizon.
Before it was built, atmospheric biodiversity in the region was measured from canopy towers of only 45 metres, and the resulting data remained heavily influenced by the vegetation immediately below. At 325 metres the picture changes completely. Scientists can now test theories about the inertial sublayer of the Amazonian atmosphere and answer questions that had gone unresolved for years, simply because no suitable vantage point existed.
Why it matters for the global climate
Studying canopy biodiversity and life at great heights is not just about cataloguing new microscopic organisms. It is a key piece in monitoring greenhouse gases and in understanding how the Amazon breathes and transpires, a process that shapes the climate balance of the planet. The ATTO project brings together studies of micrometeorology, turbulence and the transport of energy and gases, linking what happens on the forest floor with cloud formation processes of global reach. The better those interactions are understood, the more accurate forecasts of climate change impacts will be, both inside the region and well beyond it.
There is also a practical dimension for conservation policy. If a meaningful share of the rain that falls over the Amazon depends on particles the forest itself releases into the air, then keeping the forest standing stops being an abstract environmental goal and becomes a matter of hydrological infrastructure. Clearing land does not only remove trees and the carbon they store, it also switches off a mechanism that keeps water circulating across the basin. Any calculation of the cost of deforestation that ignores this layer of the system is, by definition, incomplete.
What remains, in the end, is a sense of scale. The secrets the Amazon still holds are not confined to the soil or the branches, but also travel in the air the forest breathes above itself. Every discovery like this fog ecosystem reinforces the urgency of preserving not only the visible rainforest, but the entire biological and atmospheric system that keeps it running. Protecting the Amazon means protecting that biological elevator, the one that safeguards climate balance and the lives of trillions of microscopic beings which, from high above, work for the whole planet.
Reporting: Anne Silva / Amazonia Mag. Source: Portal G1, Terra da Gente.
Editor, English Edition — Amazonia Mag
Anne Silva is the editor of Amazonia Mag, the English-language edition of Revista Amazônia. She curates, translates and adapts the outlet's science and environment coverage for an international audience, reporting on Amazon wildlife, flora, rivers, climate and research. Every story she edits is grounded in peer-reviewed studies, official data and on-the-ground reporting from the Revista Amazônia newsroom in Belém, Pará, Brazil. More by Anne Silva →