Monitoring biodiversity usually means sending researchers into forests, fields and remote landscapes to look for individual species. A new experiment suggests there may be a much faster way to gather clues about what lives in an area: simply collect the DNA drifting through the air.

Researchers mounted an air sampler on a vehicle and drove across more than 1,100 km of Western Australia.

By analyzing the microscopic genetic traces captured along the journey, they identified hundreds of plants and animals and demonstrated that airborne DNA could become a valuable new tool for large-scale environmental monitoring.

A Road Trip Became A Survey

The research team traveled from Cottesloe toward Cocklebiddy, crossing forests, agricultural land and dry inland environments on the way to the Nullarbor.

Air samples were collected at intervals of roughly 26 km. Instead of looking directly for animals, insects or plants, the researchers searched for environmental DNA, often called eDNA.

Living organisms constantly release tiny amounts of genetic material through skin cells, hair, pollen, spores and other biological particles. Some of these fragments become airborne and can potentially be captured and identified.

By sequencing the collected material, the team detected 633 different types of plants and animals.

Each Landscape Left A Signature

One of the most important findings was that the DNA did not appear as a random mixture spread evenly along the entire route.

Different landscapes produced different biological signatures. The species detected in forests differed from those found in agricultural and inland environments.

Lead researcher Joshua Newton explained that the team wanted to discover whether airborne DNA could preserve meaningful information about individual environments rather than becoming too widely dispersed. According to him, the results showed that changes in the DNA collected reflected genuine differences between the landscapes the vehicle passed through.

Environmental conditions and habitat type were actually more important in explaining changes in detected species than geographical distance alone.

The Method Could Track Pests

The technique may have uses beyond general biodiversity research.

Among the genetic material detected were traces from 12 regulated pest species, along with organisms important to agriculture and biosecurity, including native budworm, stable fly and Australian sheep blowfly.

Finding these traces does not automatically prove that a harmful species has established itself in a particular location. However, airborne DNA could provide an early warning that helps authorities decide where more detailed field investigations are needed.

This could be particularly valuable across enormous landscapes where conventional monitoring requires significant time, staff and resources.

Airborne DNA Has Limits

The method is powerful, but it cannot yet replace traditional wildlife surveys.

DNA can travel on wind currents and may also be transported indirectly on vehicles or other surfaces. A genetic trace collected in one location therefore does not guarantee that the organism itself was living immediately beside the sampling point.

Professor Paul Nevill suggested that the greatest value of the technique may be its ability to reveal broad biodiversity patterns and identify areas where scientists should concentrate more intensive surveys.

The technology is therefore better viewed as an additional layer of environmental monitoring rather than a stand-alone solution.

A New Way To Map Nature

Biodiversity is declining rapidly in many parts of the world, increasing the need for methods that can repeatedly monitor large areas without requiring enormous field teams.

Vehicle-mounted air sampling could eventually allow scientists to collect environmental information while traveling along existing roads, creating biological maps across regions that would otherwise be difficult to survey regularly.

The experiment also reveals something remarkable about the environment itself. Even when animals remain hidden and plants are far from view, tiny biological traces are constantly moving through the atmosphere.

The air around us may therefore contain an invisible record of the life occupying an entire landscape.