Coral reefs are vital sources of life for many sea creatures. The diversity of the underwater ecosystems surrounding coral reefs are, unfortunately, being put in danger because of coral bleaching. According to the National Ocean Service, coral bleaching is due in part by a process that is the result of damaged chloroplasts in coral cells which produce “toxic, highly reactive oxygen molecules during photosynthesis.” The main cause of this issue, is temperature; the coral respond to the drastic changes in temperature, whether they be hot or cold, by releasing the symbiotic algae that dwell in their tissues, which result in the coral taking on a white, “bleached” color.
Coral bleaching has both negative internal and external effects. Internally, the coral’s ecosystems are placed at risk because they “rely on live coral for food, shelter, or recruitment habitat.” This is a major issue, as we have the potential to lose certain, diverse, species that live off of and around coral reefs, which, in turn, could negatively influence the food chain. The external effect is that there will not be tourism revenue brought in from people who scuba dive to the coral reefs affected by bleaching. This is due to the fact that they will no longer be aesthetically appealing. Thus, leading to a negative economic state in tourism hot spots.
Unfortunately, the temperature of the Earth is out of human control, so there is little we can do to prevent coral bleaching, but we can use the rapidity of the bleaching as a marker to gauge the temperature of the world.