eutrofizácia vôd biodiversity 1 [vynechat] biodiverzita 1 [vynechat] eutrophication 1 [vynechat] kvalita vody 1 [vynechat] lowlands 1 [vynechat] nížiny 1 [vynechat] revitalization of streams 1 [vynechat] revitalizácia vodných tokov 1 [vynechat] vodné rastliny 1 [vynechat] vodné toky 1 [vynechat] water eutrophication 1 [vynechat] water plants 1 [vynechat] water quality 1 [vynechat] water streams 1 [vynechat]