In 2024, the soft corals near Beomseom, a small island off South Korea’s Jeju Island, suffered an unprecedented decline linked to unusually warm sea temperatures. Now, experts and local conservationists are hopeful as signs of recovery emerge in 2025, highlighting the delicate balance of this unique marine ecosystem.
- Soft corals experienced a rare 'slumping' event in 2024.
- Marine heat stress triggered coral drooping and die-off.
- Scientific studies highlight urgent ecosystem risks.
What happened
In the summer of 2024, the waters around Jeju Island reached unusually high temperatures, climbing to 30°C (86°F), much warmer than the typical 24°C (75°F) average. This extreme heat led to a striking phenomenon among soft corals near Beomseom Island, where the corals lost their structure, drooped, and in some areas, died. Unlike the well-documented coral bleaching of hard corals seen globally, this event appeared as a ‘melting’ or ‘slumping’ of these delicate marine organisms, alarming scientists and local communities alike.
Following this event, researchers from the Korea Institute of Ocean Science and Technology launched investigations into the causes and consequences. Their study pointed to not only increased water temperatures but also changes in salinity and water quality as contributing factors. The unique vulnerability of soft corals, which provide essential habitat and contribute to the region’s rich biodiversity, raised concerns about ecological impacts that could ripple through fisheries and the cultural practices dependent on the ocean.
Why it feels good
The sight of healthy soft corals during a 2025 dive near Beomseom Island offered a hopeful glimpse amid ongoing environmental challenges. The vibrant colors and sturdy formations witnessed by scientists and local advocates brought reassurance that these ecosystems can show resilience even after severe stress. This recovery potential bolsters conservation efforts focused on protecting these underwater communities and maintaining the natural beauty that supports tourism and cultural identity.
Local groups, such as the Paran Ocean Citizen Science Center, combine research with community advocacy to ensure ongoing awareness and protection. The connection locals have with the sea, exemplified by the haenyeo free-diving women who harvest marine life sustainably, underscores the importance of maintaining healthy coral habitats both ecologically and culturally. The renewed vitality of soft corals strengthens these ties and encourages continued vigilance.
What to enjoy or watch next
Visitors to Jeju and its surrounding islets like Beomseom and Munseom can enjoy remarkable underwater experiences, from diving among colorful soft corals to observing the diverse marine species these habitats support. Submarine tours offer a unique way to explore these vibrant ecosystems safely, promoting eco-conscious tourism that helps fund conservation initiatives. Watching how these coral communities respond to warming seas will be important in the years ahead.
Scientists and local advocates are closely monitoring the situation to track if similar slumping or other climate-related stress events might reoccur. Continued research is critical for developing strategies to mitigate impacts and support ecosystem adaptation. By following updates from groups like Paran Ocean Citizen Science Center and ongoing scientific studies, the public can stay informed and engaged in preserving this special marine environment.