Why seabirds matter: Warning from remote Marion Island
Why seabirds matter: Warning from remote Marion Island Seabirds on Marion Island are facing a small but mighty foe. House mice introduced by humans have multiplied on the remote outpost in the southern Indian Ocean between Africa and Antarctica, and are preying on the native birds. As some species head toward crisis, a major conservation initiative is now moving to eradicate the rodents from the islandβs 30,000 hectares in a single operation.In May, the leader of the project visited Japan, seeking support. NHK World senior science correspondent Saito Motoki explains the challenges facing Marion Island and why the campaign to save birds in one obscure place matters so much to the wider world.
Marion Island lies in the southern Indian Ocean, about 2,000 kilometers south of South Africa and roughly midway between Africa and Antarctica. Apart from around 20 researchers and support staff stationed there for meteorological and scientific work, it is virtually uninhabited.
The island is an internationally important breeding ground for seabirds and forms part of a protected South African nature reserve. One of its most iconic residents is the wandering albatross, whose wingspan can reach three meters. It is estimated that around one-third of the world's wandering albatross population breeds on Marion Island.
But Marion Island's seabirds face a growing threat. Scientists warn that 19 of the island's 29 seabird species β including the wandering albatross β could be driven toward extinction if current trends continue.The culprit is a tiny rodent: the house mouse, accidentally introduced to the island in the early nineteenth century by seal hunters. After becoming established, they initially fed on insects and other invertebrates.
In recent years, however, their behavior has changed dramatically. The mice have begun attacking seabird chicks and even adult birds, inflicting serious injuries and contributing to alarming declines in seabird populations.
Experts say climate change is making the problem even worse.Warmer temperatures have extended the mice's breeding season, allowing their population to grow rapidly. At the same time, the plants and insects that once served as their primary food sources are becoming scarcer. Researchers believe this shortage has pushed the mice to increasingly prey on seabirds, leading to escalating damage across the island's bird colonies.
An ambitious conservation campaign known as the Mouse-Free Marion Project is now underway to eradicate the mice in a single coordinated operation. The plan calls for six helicopters to disperse specially formulated rodenticide bait across the entire island, using GPS-guided flight paths to ensure complete coverage.
The operation is timed for a season when many seabirds will have migrated away from the island, reducing the risk to non-target species.Conservationists expect hungry mice to mistake the bait for food and carry it back to their burrows, allowing the eradication effort to reach even remote parts of the island.
The project is the culmination of years of planning based on lessons learned from more than 700 rodent-eradication campaigns conducted on islands around the world, as well as extensive scientific research on invasive-species management.According to project organizers, this body of evidence has helped turn what was once an ambitious idea into a practical conservation strategy. The eradication operation is currently scheduled for 2029.Conservationists hope the initiative will become a landmark example of large-scale island restoration β a model for future efforts to protect threatened wildlife elsewhere."This is the most important, one of the most important bird conservation projects in the world. Because the island is 30,000 hectares in size, it'll be the largest island from which house mice have been eradicated in one attempt," says Mark Anderson, CEO of BirdLife South Africa, the country's only dedicated bird-conservation non-profit organization.
Some might view the Marion Island project as a distant effort with little relevance to their daily lives, but conservationists say protecting seabirds matters far beyond the remote island's shores. Seabirds are among the clearest indicators of the health of marine ecosystems.
People around the world depend on the ocean for food, livelihoods, and essential natural resources. A healthy marine ecosystem is critical to sustaining fisheries and the seafood that reaches our tables.Because seabirds feed on fish and other marine organisms, changes in their populations can provide an early warning of problems unfolding beneath the ocean's surface β often before those changes become apparent to humans.
Kawakami Kazuto is Regional Research Director at Japan's Forestry and Forest Products Research Institute and a leading expert on seabird conservation.He explains why observing seabirds is vital: "For example, climate change can affect the abundance of fish in the ocean, the food on which seabirds depend. If food availability changes, seabird populations may decline as a result. In that sense, seabirds may respond to environmental changes before humans begin to feel the impacts directly. By observing wildlife, we can become aware of the risks we ourselves face. The ocean is difficult for us to see and monitor directly, but seabirds can reveal that significant changes are already taking place."
Project leaders stress that the seabirds of Marion Island are not just South Africa's responsibility, but a shared global heritage.BirdLife South Africa's Anderson has appealed for international support."The seabirds on Marion Island don't only belong to South Africa, they belong to everybody on the planet. They roam the oceans, they fly hundreds of thousands of kilometers in their lifetime across the oceans as well. So we need to work together to conserve them," he says.At a time when divisions in human society seem to be deepening, working to save seabirds β which cross oceans, continents and national borders β is a reminder that environmental challenges are global. Protecting seabirds is not only about saving individual species, but about safeguarding the health of the oceans and working together to overcome environmental threats.
