Climate

Seabird guano and native trees keep islands above rising seas: Study

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Briefings

A recent study published in Science Advances reveals that seabird guano and native vegetation on low-lying atoll islands in French Polynesia enhance reef and structural resilience against rising sea levels. Nicholas Graham, a distinguished professor at Lancaster University, led the research, which traces how nutrient-rich guano from seabirds fertilizes terrestrial and marine ecosystems. This biological pumping mechanism helps maintain island elevation even as global temperatures increase, offering a potential pathway for climate adaptation in vulnerable tropical regions.

Key points

• Seabirds act as biological pumps, moving nutrients from open ocean feeding areas to land-based roosting and nesting sites, which then fertilize reefs and underlying island structures.
• Atoll islands in French Polynesia, such as Tetiaroa Atoll, may maintain elevation and reef integrity through this nutrient cycle if they retain native vegetation and seabird populations.

Context

This research addresses critical climate change vulnerabilities in low-lying atoll islands, where rising sea levels threaten ecosystems. The study provides a scientific basis for understanding how seabirds and native vegetation interact to support island resilience, potentially guiding conservation strategies for tropical regions facing similar threats.

Limitations

The study focuses on specific atoll islands in French Polynesia and relies on observational data from a single research period. It does not account for long-term climate variability or human impacts like deforestation, which may alter the nutrient dynamics. Results are preliminary and subject to further validation through additional field studies.

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