The European flat oyster (Ostrea edulis) was once widespread but has now become so scarce in the North Sea that it no longer forms ecologically functioning reefs. Along with the demise of the flat oyster, the three-dimensional structures that provide habitat for more than 100 marine species have...
Source: [Phys.org](https://phys.org/news/2026-08-strong-oyster-reefs-genetic-diversity.html)