A complex mixture of organisms (algae, cyanobacteria, heterotrophic microbes, detritus, etc.) clinging on the surfaces of plants and other objects projecting from the bottom sediments of aquatic ecosystems.
A complex mixture of organisms (algae, cyanobacteria, heterotrophic microbes, detritus, etc.) clinging on the surfaces of plants and other objects projecting from the bottom sediments of aquatic ecosystems.
