Global Coral Reefs Face Accelerating Decline

Recently, the Global Coral Reef Monitoring Network (GCRMN) reported that global coral reefs are facing accelerating decline, with increasingly frequent bleaching events leaving less time for recovery from severe heat stress.

What is Coral Bleaching?

  • Definition: Coral bleaching occurs when heat stress causes corals to expel their symbiotic algae, resulting in loss of colour and weakened health.
  • Major Driver: Marine heatwaves have become the strongest global driver of coral-cover decline.
  • Heat Stress: A Degree Heating Week (DHW) measures accumulated heat stress experienced by coral reefs.
  • Threshold: 4°C-weeks is associated with significant bleaching, while 8°C-weeks can cause widespread bleaching and mortality.

What is ....

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Ecology & Environment