Marine Endolithic Cyanobacteria - 9

The term "biokarst" refers to the bizzarely sculptured and corroded limestone produced by combined activities of microbial endoliths, largely cyanobacteria, and their grazers: gastropods, polyplacophors and, in lower intertidal ranges, sea urchins. Dark coloration of otherwise lightly colored limestone stems from cyanobacterial extracellular pigments, which protects them from UV radiation.

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