Journal of Phycology

Rhodoliths may look like small rocks on the seafloor, but they're actually living algae that create habitats for marine life and contribute to long-term carbon storage. A new study found that the deeper ‘low-light’ waters off Japan's Tanegashima Island harbor a surprisingly distinct and diverse community of these ‘living pink rocks,’ including four species completely new to science. Researchers identified at least 12 species in a small patch of seafloor 35–38 meters deep, but only three were also found in nearby shallow waters, suggesting the deeper habitat is not simply a continuation of the one near the surface.