The revival of endangered wildlife on Kangaroo Island owes much to a remarkable initiative: a 380-hectare zone designed to be free from predators, established by the esteemed Australian Wildlife Conservancy.
It has been five years since the introduction of a cat-proof barrier surrounding the Western River Refuge, which has played a pivotal role in the recovery of vulnerable species in this unique ecosystem.
Pat Hodgens, the principal ecologist at the Australian Wildlife Conservancy, expressed astonishment at the significant progress of these vulnerable populations. He estimates that species like the Kangaroo Island dunnart have seen their numbers soar by an impressive 90 to 100 percent. However, it’s worth noting that prior to the catastrophic bushfires, determining accurate population figures was challenging; the dunnart is a small, elusive creature that is notoriously hard to survey due to its size and timid nature.
"The dunnart has exceeded expectations, thriving much better than many anticipated, including myself six years ago," Mr. Hodgens shared. "While there are still dunnarts present outside the fence in decent numbers, we are witnessing a significantly higher activity level within the protected area."
In a surprising turn of events, experts were thrilled to see the return of bird species such as the western whipbird after the devastating fires that ravaged the island's landscape. Remarkably, the population of the western whipbird has also surged by about 100 percent, alongside the Bassian thrush, both of which are heavily preyed upon by feral cats. "At the time we built the cat exclusion fence, these birds were absent, but they've made a significant comeback since then," Mr. Hodgens remarked.
Initially, the Western River Refuge project was intended as an experimental effort. However, following the bushfires, it transformed into what Mr. Hodgens described as a "rescue mission."
"We anticipated severe impacts from the fires, and we quickly mobilized to conduct surveys in the aftermath," he explained. With over 90 percent of the habitat crucial for vulnerable species annihilated, the native wildlife faced dire challenges for survival.
Mr. Hodgens observed, "There was a notable influx of feral cats traversing the fire-damaged areas, discovering unburned patches, and preying on any surviving creatures they could find."
Realizing that completely eradicating feral cats from Kangaroo Island was likely unfeasible, the Australian Wildlife Conservancy decided to establish the cat-proof fence around an existing population of dunnarts while concurrently removing feral cats during the construction process. According to Mr. Hodgens, this strategy was crucial for protecting many native animals from predation.
On the cultural front, Ngarrindjeri elder Mark Koolmatrie, who conducts cultural tours on Kangaroo Island, expressed his enthusiasm over the resurgence of native species. "It's essential for these native animals to return, as they are integral to this land," he stated. He emphasized the importance of focusing on solutions rather than merely fixating on problems.
For Mr. Koolmatrie, revitalizing the land transcends mere biodiversity enhancement; it is a responsibility shared by the Ngarrindjeri People and other residents of Kangaroo Island. "We are the original caretakers of this land," he noted. "Collaboration with the Ngarrindjeri is vital. We aim to restore this environment by working together with islanders. After all, islanders have been enhancing this land for over two centuries."
He further asserted that integrating traditional land management practices into contemporary methods through cooperation will ensure the environment's resilience and recovery.
"This marks the beginning of our journey, not the end," he concluded.
