It’s official: the Great Barrier Reef is suffering its fourth mass bleaching event since 2016. We dived into the reef and saw the unfolding crisis firsthand.
. Surviving colonies also become more susceptible to other challenges, such as disease.
For example, fast growing branching corals are the most susceptible to bleaching and are generally the first to die. Long-lived massive corals, such as porites, may be less susceptible to bleaching, show minimal effects of bleaching and recover quicker. To the casual observer, fluorescent corals look bright purple, pink, blue and yellow. For reef scientists, fluorescence is an obvious signal that corals are stressed and struggling to regulate their internal balance. As we’ve seen, white and fluorescent corals are currently a common sight on many reefs.
Others are never visible, and some are visible only during times of heat stress when coral colonies boost these fluorescent pigments to fight the increasing ultraviolet intensity in warmer seas.
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