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Maximum daily distribution area (bar graph) and maximum coverage area (dashed line) of Ulva prolifera green tides between 2008 and 2021 (data from The Bulletin of China Marine Disaster: 2009–2021 (MNR, 2009–2021)). Notes: Data based on satellite remote sensing (250 m and 50 m resolution). The distribution area is equal to the sum of the coverage area and the gap between the floating patches.
