When the concentration of nutrient salt increases, the numbers of algae and plankton swell, disrupting the photosynthetic processes of the Symbiodinium algae inside the coral.
羅亞解釋，水中營養鹽增生使得藻類、浮游生物都大量增加，影響珊瑚共生藻行光合作用，珊瑚本身的攝食也受到排擠而難以存活。