Why did the Osprey disappear as a breeding species in Switzerland?

The Osprey once bred throughout Europe where there was suitable aquatic habitat, but they disappeared from a large part of western, central and southern Europe. For the most part only populations in northern Europe, specifically in Fennoscandia but also some small populations in Eastern Germany and Poland, remained. Continue reading Why did the Osprey disappear as a breeding species in Switzerland?

Why won’t the Ospreys return to breed in western Switzerland by themselves?

Balbuzard par Pascal RapinThe reason that it is very unlikely (with nature you can never say impossible, but we can say very unlikely) that the Osprey will  start breeding in western Switzerland again without help is due to “philopatry”. Philopatry is the tendency of an individual to stay or to return to the place where they were born in order to breed. Some species, like the Osprey, have a very strong philopatry, which results in a very limited ability to disperse to new areas. This means that when a population disappears, it is exceedingly unlikely that individuals who were not born in this area will recolonise it, even if suitable habitat exists. Continue reading Why won’t the Ospreys return to breed in western Switzerland by themselves?

The Osprey in Switzerland