Bird DNA in a Farm Pond: How Artificial Waterbodies Reveal Hidden Species
New study finds that eDNA from human-made waterbodies can help detect elusive and threatened birds - offering a cost-effective tool for conservation monitoring
eDNA finds a new niche in bird surveys
Environmental DNA (eDNA) techniques have transformed the way scientists detect aquatic life, but until now, their use for monitoring birds has been limited. A new study by Young et al., published in Ecology and Evolution, shows that artificial waterbodies like stock dams and agricultural ponds can serve as powerful sources of bird eDNA - including for threatened and elusive species.
The research was conducted in south-eastern South Australia, where scientists sampled 46 artificial waterbodies across different land uses. These ponds, created mainly for livestock or cropping, were tested for avian DNA using metabarcoding techniques. The results were striking: bird DNA was detected at 43 out of 46 sites, representing 64 species - including many of high conservation concern.
Threatened species revealed in farm-country ponds
Among the species detected were the Vulnerable Australasian Bittern, the Endangered South-eastern Red-tailed Black-Cockatoo, and the nationally listed Hooded Plover. Remarkably, 15 species found through eDNA had not been recorded during simultaneous visual surveys of the same sites, underscoring the technique’s ability to detect cryptic or low-density birds.
Other notable detections included Hardhead, Australian Shelduck, Eastern Spinebill, and the arid-adapted Cinnamon Quail-thrush. The findings suggest that eDNA methods can provide a fuller picture of avian communities, particularly when combined with conventional observation techniques.
How does bird DNA end up in water?
Birds leave behind traces of DNA through feathers, faeces, skin cells, and secretions, which enter water when they bathe, drink, or forage. Artificial waterbodies, often visited repeatedly by both resident and migratory species, effectively act as collection points for this genetic material.
Sampling such waterbodies offers several advantages: they are small, easily accessible, and well-distributed across rural landscapes. These features make them ideal for cost-effective and scalable biodiversity monitoring. The study’s success rate - detecting bird DNA at 93% of sites - demonstrates the robustness of the approach.
A tool for conservation and restoration
eDNA techniques offer particular promise for detecting threatened or hard-to-see species that might otherwise be missed by traditional methods. This is especially valuable in regions where birds are undergoing declines due to habitat loss or changing agricultural practices.
The authors argue that eDNA should not replace field surveys, but rather complement them - creating a hybrid approach that increases detection power and confidence in species assessments. Artificial waterbodies could become key nodes in a broader conservation network, helping land managers track the presence of target species and assess the outcomes of habitat restoration or revegetation efforts.
Looking ahead: practical applications and policy potential
The study highlights the practical benefits of this method: it is non-invasive, efficient, and relatively inexpensive compared to extensive fieldwork. It also opens the door to citizen science and landholder participation, particularly in regions where volunteers already monitor waterbodies or maintain farm dams.
In a time of rapid biodiversity loss, the ability to detect birds through a few litres of pond water is more than a scientific curiosity - it could be a transformative tool in the conservation toolbox. As artificial waterbodies become more common in agricultural landscapes, they may yet offer refuge not just for livestock, but for wildlife as well.
June 2025
Share this story
