Endangerment of the biological minimum and eutrophication – factors of disturbance of ecological balance and sustainability of the Ukrina river ecosystem

Abstract

The Ukrina River (Bosnia and Herzegovina) is a smaller right tributary of the Sava River, whose basin lies between the lower reaches of the Vrbas and Bosna rivers. In addition to being a relatively small basin area, the Ukrina River is characterized by exceptional biological diversity. The appearance of the mayflies (Ephemeroptera) in the summer period of the year also contributes to the biological diversity of the Ukrina River, which makes it the site of this natural rarity. In this study, the threat to the biological minimum and the increased eutrophication of water are considered, as the main factors of disturbing the ecological balance and sustainability of the Ukrina River ecosystem.

Rijeka Ukrina (Bosna i Hercegovina) je manja desna pritoka Save, čiji sliv leži između donjih tokova rijeka Vrbasa i Bosne. Pored toga što predstavlja relativno malo slivno područje, rijeku Ukrinu karakteriše izuzetna biološka raznovrsnost. Biološkoj raznovrsnosti rijeke Ukrine doprinosi i pojava vodenog cvijeta (Ephemeroptera) u ljetnom periodu godine, što je čini lokalitetom odvijanja ove prirodne rijetkosti. U ovoj studiji, razmatraju se ugrožavanje biološkog minimuma i eutrofikacija vode kao glavni faktori remećenja ekološke ravnoteže i održivosti ekosistema rijeke Ukrine.