Reports describe how invasive rats on seabird islands in the Indian Ocean affect nearby coral reef ecosystems. The rats prey on seabirds and sharply reduce seabird populations. Seabirds normally contribute nutrients to surrounding reefs through guano, which fertilizes the water and supports marine productivity. When rat predation lowers bird numbers, that nutrient input declines, and the reef community reorganizes. Sources say the shift changes where marine organisms thrive: small reef-associated fish are reported to do well in nutrient-enriched areas, while invertebrates become more successful in comparatively less fertile zones. Overall, the restructuring of nutrients and habitats alters reef food-web dynamics and changes the relative success of different groups. The accounts emphasize that removing invasive rats is associated with the possibility of restoring seabird colonies and their nutrient contributions, suggesting a direct link between terrestrial invasive species management and marine ecosystem health. The ecological outcome is presented as a clear example of how island impacts can propagate into adjacent marine systems.