Benefits for Birds and Biodiversity

This unique ecosystem has hosted many ambitious restoration projects, from the meticulous removal of African Big-Headed Ants to the rediscovery of the Lord Howe Stick Insect. But the removal of harmful invasive rodents would prove to be one of the most beneficial of all. 

Conservationists implemented extensive monitoring and mitigation plans to safeguard Lord Howe’s rare species, including the endangered Lord Howe Woodhen and Currawong. Over 90% of the Woodhen population was temporarily relocated during the operation and re-released to their healing island home once rats were gone. 

The results of this work were dramatic. Post-eradication surveys showed surprisingly steep increases in native bird populations. The Woodhen population more than quadrupled, and other species like the Silvereye and Golden whistler also saw significant gains. Even species with precarious populations, such as the Buff-Banded Rail, rebounded quickly!

Seabirds as Ecosystem Engineers

The newly-published Grant et al. (2025) study adds a fascinating layer to this story. It shows how seabirds like the Sable Shearwater contribute to island ecosystems by transporting marine nutrients inland where they can be recycled. Their guano enriches the soil with nitrogen, phosphorus, and potassium—key ingredients for healthy plant growth. This nutrient transfer boosts the vitality of primary producers like the Kentia Palm. The benefits quickly spread across the food web, even affecting the stable isotope signatures of soil invertebrates like Leopard Slugs. 

Interestingly, the study found that even abandoned seabird colonies still showed signs of marine-derived nutrients. This suggests a long-lasting ecological imprint and highlights the interconnectedness of island ecosystems with their marine counterparts. 

Why Holistic Restoration Matters

The success on Lord Howe Island was thanks to collaboration and cooperation to manage an incredibly complex project. By combining invasive species management with careful protection of native wildlife, we created the conditions for biodiversity to flourish. The resurgence of seabirds, the rebound of endemic birds, and the revitalization of plant communities all point to the power of holistic restoration. Bringing back biodiversity builds a strong foundation for all interconnected ecosystems! 

Although they may seem small and isolated, islands are complex systems where every species plays a role. Seabirds fertilize the soil. Native birds control insect populations. Plants stabilize the terrain. Remove one piece, and the whole puzzle shifts. Restore it, and the ecosystem begins to heal. 

A Model for Island Conservation Worldwide

Lord Howe Island’s journey offers hope and a blueprint for other island ecosystems facing similar challenges. It shows that science-led, community-supported conservation can reverse ecological decline and spark a biodiversity renaissance. 

Because they’re on the front lines of interconnected global crises—climate change, biodiversity loss, and failing ocean health—islands are important laboratories to explore conservation solutions that can affect the entire planet. The more we learn about how nutrients move through these complex ecosystems, the better we’ll be positioned to holistically restore more ecosystems for nature and people worldwide!