What invasive species have caused the most ecological catastrophe?

The answer

A 2023 IPBES report estimated invasive species cost the global economy $423 billion annually, with costs doubling every decade. Among the most destructive: the brown tree snake, introduced to Guam in the 1940s, eliminated 10 of 12 native forest bird species. Burmese pythons released in Florida's Everglades have reduced raccoon populations by 99.3% and rabbits by 98.9% since 2000. The chytrid fungus Batrachochytrium dendrobatidis has driven 90 amphibian species to extinction - the greatest disease-caused biodiversity loss ever recorded. Lionfish, native to the Indo-Pacific, now dominate Caribbean reefs, consuming over 460,000 prey fish per acre of reef annually and reducing native fish recruitment by 79%.