colony of common freshwater sponge feed on floating organic particles on a bed of shallow freshwater river

air algae aquaplant aquatic background balance bed big biotope branch brook bubble ceratophyllum clear climate colony colorful common concept contrast crystal current demosponge detritus disaster ecology ecosystem environment environmental europe explore feed floating flora flow freshwater gravel ground human impact lacustris lake litter movement nature organic particles plant porifera ray river sand season shallow sponge spongilla spongillidae stem stream strong substrate sun temperate ukraine underwater unusual vegetation vinnytsia vulnerable water wave wonder