Researchers have launched a new online resource that provides a comprehensive overview of hard coral distribution across the Ryukyu Islands, using environmental DNA (eDNA) analysis. The tool aims to track the impacts of environmental change and support conservation efforts in the region.
The project, led by scientists from the University of the Ryukyus and other institutions, analyzed seawater samples from multiple sites around the islands. By detecting coral DNA in the water, the team created detailed maps showing where different hard coral species are present, including areas that are difficult to survey visually.
According to the study, published in the journal Scientific Reports in 2025, the eDNA method successfully identified 28 hard coral species across 12 sampling sites. The maps are now freely available online, allowing researchers and conservationists to monitor changes in coral communities over time.
This approach is particularly valuable for tracking the effects of climate change, such as coral bleaching events, and for identifying priority areas for marine protected areas. The Ryukyu Islands are home to some of the world's most diverse coral reefs, which are under threat from rising sea temperatures and ocean acidification.
The resource is expected to be updated regularly as new eDNA samples are collected, providing a dynamic tool for coral reef management in the region.
