August M
An isolated population of koalas in Australia is drawing global scientific attention.
Researchers believe these animals could play a crucial role in protecting the species’ future.
According to a BBC report, Kangaroo Island is home to the largest known population of koalas free from chlamydia, a disease devastating mainland groups. Scientists are now studying how these animals could help rebuild healthier populations elsewhere.
Chlamydia, caused by the bacterium Chlamydia pecorum, can lead to blindness, infertility and death in koalas. On parts of the mainland, infection rates have reached as high as 88%, posing a major threat to the species.
Island advantage
The BBC reports that Kangaroo Island’s isolation has protected its koalas from infection, creating what experts describe as a natural safeguard for the species.
Natasha Speight, a researcher at the University of Adelaide, said the population is “the largest population in Australia with this status”.
However, this protection has come at a cost. Descended from a small group introduced in the 1920s, the island’s koalas show low genetic diversity, making them vulnerable to defects and environmental change.
“We’ve found males with one testicle, or none,” said researcher Julian Beaman. “And we’ve seen spinal deformities.”
Expectation for rescue
Scientists are now working on a strategy known as genetic rescue, which involves introducing more genetically diverse koalas to strengthen the population.
According to the BBC, researchers from Flinders University plan to bring selected mainland koalas to the island to breed naturally with local animals. The aim is to improve genetic health while preserving the population’s disease-free status.
If successful, these koalas could later be introduced back to parts of mainland Australia where chlamydia rates are lower.
“This population is highly inbred,” said Carolyn Hogg of the University of Sydney, stressing the need for intervention.
Growing threats
Despite their disease-free status, Kangaroo Island’s koalas face other challenges. The BBC notes that bushfires in 2019-20 killed around 80% of the population, dramatically reducing their numbers.
Habitat loss has also added pressure, particularly after logging activity reduced key food sources. In response, conservationists established a protected sanctuary to secure land for surviving animals.
The site is expected to support research and conservation efforts, as well as open to visitors to help fund ongoing work.
Long-term mission
Researchers say restoring genetic diversity will take years, but early steps are already under way, including breeding trials and DNA analysis.
“It’s the first time genetic rescue will have been done for koalas at this scale,” said Hogg.
The BBC reports that the long-term goal is to create a koala population that is both genetically strong and free from disease, offering a model for conservation efforts nationwide.
Experts believe the project could help stabilise declining koala populations and provide a blueprint for protecting other vulnerable species.
Sources: BBC, Flinders University, University of Adelaide, University of Sydney
