Invasive rats and iguanas threaten Caribbean seabird colonies

Recent ecological assessments of offshore cays in the U.S. Virgin Islands have documented invasive black rats on five islands and green iguanas on one, prompting conservationists to devise targeted removal strategies to safeguard vulnerable seabird species.

The surveys identified significant threats to nesting populations of red-billed tropicbirds and other native seabirds that depend on these islands for breeding. Black rats, in particular, prey on eggs and chicks, while green iguanas compete for nesting space and consume vegetation essential to island ecosystems. Both species pose substantial risks to the long-term viability of seabird colonies in the region.

Conservation officials are now evaluating feasible approaches to eliminate or control the invasive populations. Successful eradication efforts could substantially improve breeding conditions and create safer nesting environments for seabirds across the surveyed islands.

The findings underscore the critical role invasive species management plays in preserving Caribbean marine ecosystems. Restoring these offshore habitats represents a key priority for wildlife protection efforts in the region, with outcomes expected to inform broader conservation initiatives across similar island environments.