The super-bloom.
A months-long algae bloom blanketed the lagoon from spring through fall. Sunlight vanished from the water column for so long that mapped seagrass acreage dropped roughly 43% in a single year (2009 to 2011) — tens of thousands of acres. The scale had never been seen before. The scientific community used the phrase "catastrophic loss." Cumulative losses continued through 2019, eventually reaching about 60% of pre-collapse acreage. The lagoon's ability to regrow from its own seed bank was pushed to a threshold beyond which recovery is uncertain.