The story of the Thorsborne couple's pigeon count is a testament to the power of citizen science and the importance of long-term monitoring in conservation. What began as a simple act of counting birds on a remote island has evolved into a decades-long effort that has not only saved a species but has also shaped our understanding of conservation and the environment.
In 1965, Margaret and Arthur Thorsborne, a couple with a shared passion for nature, embarked on a journey to Hinchinbrook Island, Queensland. They were captivated by the beauty of the island and its surrounding forests, wetlands, and wildlife. Among the animals that caught their attention were pied imperial-pigeons, a species that would become the focus of their conservation efforts.
The Thorsbornes were not just observers; they were proactive. They noticed the decline in pigeon numbers and the threats posed by shooting and habitat loss. Their response was to start counting the pigeons, a seemingly simple act that would have profound implications.
The first count in 1965 revealed a population of 4,692 birds. But within a few years, the numbers had plummeted to 1,451. This sharp decline was not just a number on a page; it was a wake-up call. It showed that the decline was real and measurable, not just a perception.
The Thorsbornes' annual survey became a conservation campaign. They used their findings to raise awareness about the shooting of pigeons and the deteriorating condition of the forests. Historical accounts describe large-scale shooting, with hundreds of birds killed in incidents. The pressure eventually eased, and large-scale shooting stopped in 1968.
The survey expanded, becoming a community effort. Friends, volunteers, and conservation organizations joined the cause. By the 1980s, the Queensland Parks and Wildlife Service took over, with ranger Dave Green playing a crucial role. The survey grew to multiple counts during some breeding seasons, ensuring a comprehensive understanding of the pigeon population.
The numbers began to rise, reaching 20,000 birds by the colony's 21st birthday. The colony's recovery was a testament to the success of conservation efforts. However, the story took a twist in 2011 when Cyclone Yasi caused extensive damage to the breeding island habitat and mainland forests. The colony's numbers dropped again, settling at around 23,000, well below the average before the cyclone.
The old counts remain valuable, providing a baseline for understanding changes. Without them, it would be challenging to grasp the colony's dramatic transformation. The project's longevity is a strength, offering a broader view of wildlife populations, which can fluctuate from year to year.
Margaret Thorsborne's dedication to the pigeon project and her broader conservation work is remarkable. Her efforts extended beyond the pigeons, focusing on Hinchinbrook's landscapes, cassowaries, mahogany gliders, and native plants. The Thorsborne Trust, established in Arthur's memory, continues her legacy, engaging in habitat protection, wildlife conservation, environmental education, research, and community projects.
The trust's approach is unique, emphasizing that conservation doesn't always require ownership or control of land. It can start with keeping records, raising concerns, and ensuring the issue remains visible. The North Brook Island count, now one of Australia's longest-running wildlife monitoring programs, is a testament to the trust's efforts.
In conclusion, the Thorsborne couple's pigeon count is a powerful example of how a single act of observation can lead to significant conservation outcomes. Their dedication and the support of the community have not only saved a species but have also contributed to our understanding of the environment and the importance of long-term monitoring in conservation efforts.
