Abstract
Three nutrient addition experiments were conducted to induce green tides of Ulva prolifera from April to August in 2016 in the coastal waters of Qingdao, China. Photosynthetic activity (Fv/Fm), biomass, nutrients and temperature were measured.We found that Fv/Fm of U. prolifera increased to the maximum about 0.7 ∼ 0.75 under favorable environment, and declined significantly when the growth of U. prolifera was limited by nutrient and temperature. In Addition, the results showed that Fv/Fm increased to the maximum prior to occurrence of green tide and fell significantly before green tide dissipated. Fv/Fm can be used to predict the outbreak and dissipation of green tides.
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