Effect of forest management activities on breeding success of the Booted eagle (Hieraaetus pennatus) in the Tietar valley

Authors: GARCÍA DIOS, I. S. and VIÑUELA, J.

Published: Volume 47(2), December 2000. Pages 183-190.

Language: Spanish

Original Title: Efectos de la gestión forestal sobre el éxito reproductor del Aguililla Calzada (Hieraaetus pennatus) en el valle del Tiétar

Keywords: Booted eagle, breeding success, forest management and Hieraaetus pennatus.

Summary:

The variation in breeding success (clutch size, number of eggs hatched, and nestling mortality) of Booted eagles was studied in the Tietar valley (Avila, central Spain). We found significant year to year variation in clutch size and nestling mortality, probably associated to weather. Rainfall during early spring in mediterranean climates can be associated to large clutch sizes. On the contrary, rainfall during the nestling period may increase mortality through negative effects on hunting performance. Forest management activities in the surroundings of nests (tree-felling, resin extraction, and bush clearing) negatively affected clutch size and number of hatched eggs. Furthermore, pairs nesting on territories affected by those activities tended to change the nest on the following nesting season more frecuently than unaffected pairs. The negative effect of forest management may be especially marked on years with abundant rainfall on critical periods (early stages of the breeding process). Possible management measures to reduce these effects are proposed.

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