Slumping: An Emerging Threat to Soft Corals
Context
A phenomenon known as “slumping” has been observed among soft corals around South Korea’s Jeju Island. Rising sea temperatures and increasingly extreme weather linked to climate change are placing additional stress on coral ecosystems. Recurring slumping events could hinder coral recovery and contribute to the gradual degradation of marine habitats.
Key Highlights
- Soft corals around Jeju Island are undergoing slumping, where coral colonies lose their upright form and collapse.
- Unlike hard corals, soft corals lack rigid calcium carbonate skeletons and rely partly on internal fluid pressure to maintain their structure.
- Rising sea temperatures and extreme weather events can disrupt this internal pressure, triggering slumping.
- Repeated episodes may limit the ability of coral colonies to recover, gradually weakening their health and resilience.
- Researchers found similarities between the 2026 event and an episode recorded in 2024, with prolonged high sea temperatures and potential influences from typhoons, heavy rainfall and freshwater inflow from the Yangtze River.
Key Concepts
- Coral Slumping: The collapse or loss of an upright posture in soft corals when the internal fluid pressure supporting their structure is disrupted.
- Soft Corals: Corals that lack the rigid calcium carbonate skeleton characteristic of hard corals and rely partly on internal water pressure for structural support.
- Coral Bleaching: A stress response in which corals expel their symbiotic algae, often due to unusually high sea temperatures. Prolonged bleaching can severely weaken corals and may result in mortality.