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Background Cyprinidae are a large family of freshwater fish that comprise carp, true minnow and their relatives. Recent studies show a decline in the populations of some threatened endemic cyprinid fish species in the Duero and Tajo river basins. In order of importance, the main reasons for this decline are the existence of obstacles in the river channel ...

Background After two decades of recovery, species of black vulture and other necrophagous birds (i.e. feeding on carrion) face a new threat, namely a lack of food. This has been caused by several factors, including the emergence of bovine spongiform encephalopathy (BSE), which provoked strict measures to prevent its spread; the most important, with regard ...