珊瑚组成的珊瑚礁是世界上最古老的生态系统之一,许多海洋生物都选择珊瑚礁作为安身立命之所。珊瑚种类丰富,而且还多姿多彩。珊瑚美丽的颜色来自于体内的共生海藻,珊瑚依赖体内的微型共生海藻生存,海藻通过光合作用向珊瑚提供能量。如果共生藻离开或死亡,珊瑚就会变白,最终因失去营养供应而死。 Coral reefs composed of coral reefs is one of the oldest ecosystems in the world, and many marine organisms choose coral reefs as a place to settle down. Coral species rich, but also colorful. The beautiful color of coral comes from symbiotic algae in the body. Coral relies on the survival of the micro-symbiotic algae in the body. The algae supply energy to the coral through photosynthesis. If the algae leave or die, the coral will turn white and eventually die of losing nutrients.