biodiversity 2 [vynechat] biodiverzita 2 [vynechat] aquatic animals 1 [vynechat] eutrofizácia vôd 1 [vynechat] eutrophication 1 [vynechat] kvalita vody 1 [vynechat] lowlands 1 [vynechat] nature conservation 1 [vynechat] nížiny 1 [vynechat] ochrana prírody 1 [vynechat] riečne ekosystémy 1 [vynechat] river ecosystems 1 [vynechat] vodné rastlinné spoločenstvá 1 [vynechat] vodné rastliny 1 [vynechat] vodné toky 1 [vynechat] vodné živočíchy 1 [vynechat] water plant communities 1 [vynechat] water plants 1 [vynechat] water quality 1 [vynechat] water streams 1 [vynechat]