title: Density and abundance estimates of cetaceans in the Black Sea through aerial surveys (ASI/CeNoBS)
abstract: Introduction Population abundance is amongst the most basic and crucial parameters for the assessment of conservation status of any species. Three species of odontocetes, all represented by local subspecies, inhabit the Black Sea: the Black Sea common dolphin Delphinus delphis ponticus , the Black Sea bottlenose dolphin Tursiops truncatus ponticus , and the Black Sea harbour porpoise Phocoena phocoena relicta . Their populations are threatened by multiple factors, including overfishing of their 
journal: Frontiers in Marine Science