Stoneworts — an ancient class that combines the attributes of algae and higher-order plants — serve as a source of food for waterfowl, especially
during autumn migrations.
Wrapped in a weightless veil of cladophoraceae algae — poetically named mermaid’s hair — stoneworts adorn this 260-meter-deep karst lake, their mild radiancy juxtaposed against the gloomy rock walls of the deep. When exposed to sunlight or strobes, stoneworts start to shed their own light. This phenomenon
is known as photoluminescence, and lasts for only a fraction of a second.