Principal causes of decrease of the productivity
a) Factors that make the lay
- The adults' death or the presence of sexually immature specimens in the pairs.
The absence of food.
The cold and rainy winters.
Factors that affect negatively during the incubation or breeding of the
The absence of food, which provokes the abandonment of the nest on part
of the female and consistently the death of the chicks for famine.
- Human Inconveniences in the nest: the activities that imply a long or regular permanence in the areas of breeding and those that place on crags make the eagles feel very insecure, and they do not hesitate to leave the nest. The most aggressive are: jeeps, motorcycles, mountain bikes, climbing, flying devices, trekking, photographs of nests, etc.