shallow freshwater river with clear water and dense vegetation, yellow water-lily, potamogeton and hornwort survive

air algae aquatic background balance biotope brandybottle brook bubble ceratophyllum challenge clear climate coldwater colorful concept contrast covered crystal current demersum dense detritis detritus disaster driftwood ecology ecosystem environment environmental europe explore flora flow freshwater gravel ground hornwort human impact lake leaf litter lutea moderate movement nature nuphar plant podillya potamogeton ray river sand season shallow stem stream strong substrate sun survive temperate ukraine underwater vegetation vulnerable water waterlily wave wet wonder yellow