Pesticides detected in 80% of endangered Australian cockatoos
- Scientists tracked Carnaby's cockatoos for three breeding seasons.
- Pesticides were found in 80% of the tracked birds.
- The birds are exposed to a 'chemical cocktail' in WA's Wheatbelt.
- Grain contaminated with pesticides is a likely source of exposure.
Alarming contamination in the Wheatbelt
A three-year study tracking Carnaby's cockatoos in Western Australia's Wheatbelt region has revealed that 80% of the birds carry detectable levels of pesticides in their systems. The research, conducted by Murdoch University scientists, points to a widespread contamination problem affecting this endangered species.
The Carnaby's cockatoo, a black cockatoo endemic to southwest Australia, has been in decline for decades. Habitat loss has pushed the birds into agricultural areas where they feed on grain crops—grain that is often treated with pesticides.
A 'chemical cocktail' in everyday feed
Scientists monitored the cockatoos over three consecutive breeding seasons, collecting samples to test for pesticide residues. The results showed that the majority of birds were exposed to multiple chemicals simultaneously. Researchers described the mixture as a 'chemical cocktail.'
The likely source is contaminated grain. Farmers in the Wheatbelt use pesticides to protect crops, and cockatoos foraging in these fields ingest treated seeds and plants. The cumulative effect of these chemicals on the birds' health is not yet fully understood, but the findings have raised serious concerns among conservationists.
Breeding success under threat
Exposure to pesticides can affect reproduction, immune function, and long-term survival. For a species already struggling with habitat fragmentation and competition for nesting hollows, any additional stressor could push populations closer to the edge.
Researchers are now calling for more detailed studies to understand the sub-lethal effects of these chemicals on Carnaby's cockatoos. They also urge a review of agricultural practices in areas where the birds forage.
Officials have not yet confirmed any immediate changes to pesticide regulations. Conservation groups, however, are pressing for buffer zones and alternative pest management strategies to reduce the risk to native wildlife.
What happens next
The research team plans to expand its monitoring to other cockatoo populations and investigate whether the contamination is seasonal or year-round. The findings are expected to inform future conservation policies for the species.