The Danube Delta: The Achilles Heel of Danube River–Danube Delta–Black Sea Region Fish Diversity under a Black Sea Impact Scenario Due to Sea Level Rise—A Prospective Review

The Danube Delta is one of Earth’s biodiversity hotspots and includes many endemic, rare, important species both major conservation economic value. This unique complex ecosystems also plays a key role for River Black Sea fish fauna through its as natural safe buffer, shelter, feeding, reproduction, smooth transitional area large number species. Climate change inducing progressive sea level rise in the Sea, fact that expected to impact delta’s dynamic habitats, biocoenoses, associated biota, last but not least taxonomic group, namely, fish. Around one-third this delta will be greatly affected, sometimes negatively, by climate scenario, another lesser extent, final at all. ecological positive feedback can stimulate environmental responsible changes within ecosystems, near diverse matrix aquatic semi-aquatic ecosystems. considered have been main stress factors past, likely case future. In spatio-temporal context, under threat risk, situ-adapted management measures are highly required. current work brings first time such prospective knowledge about potential on River–Danube Delta–Black coast diversity change–sea scenario.