(2) Algae → Zooplankton → Fish (or shrimp or shellfish) → People

(3) In the process of photosynthesis, algal blooms consume a lot of CO 2 in seawater, thus increasing the pH value of seawater.

(4) The water surface in the red tide area is covered by red tide organisms, which reduces the light transmittance of seawater and seriously affects the photosynthesis of other phytoplankton and aquatic plants; During the disappearance period, a large number of red tide organisms died, and a large amount of dissolved oxygen in seawater was consumed, which made the water lack oxygen; After the death of red tide organisms, a large number of harmful gases are generated by decomposition, causing air pollution; Some red tide algae living in colloidal communities can damage the respiratory and filtering organs of marine animals.