big colony of common freshwater sponge feed on floating organic particles in a shallow freshwater river with clear water

air aquatic background balance biotope branch brook bubble clear climate colorful contrast crystal current demosponge detritus disaster driftwood ecosystem environment environmental europe flora flow gravel ground human impact lacustris lake lily litter lutea moderate movement nature nuphar plant porifera ray sand season spongilla spongillidae stem stream strong substrate sun temperate ukraine underwater unusual vinnytsia vulnerable water wonder yellow