Dispersal and survival of juvenile black vultures Aegypius monachus in central Spain

Doi: http://dx.doi.org/10.13157/arla.62.2.2015.351

Authors: Juan P. CASTAÑO, Juan F. SÁNCHEZ, Miguel A. DÍAZ-PORTERO and Mónica ROBLES

E-mail: jpcastano@jccm.es

Published: Volume 62.2, December 2015. Pages 351-362.

Language: English

Keywords: conservation, GPS satellite monitoring, home range and poison

Summary:

We studied initial dispersal of juvenile black vultures Aegypius monachus from 2010 to 2012 in Castilla-La Mancha (central Spain) by using GPS satellite transmitters. Our aim was to get information about dispersal areas and home ranges and to study possible differences in dispersal behaviour according to sex and marking circumstances (as nestlings or released from care). We found large differences between individuals, especially with respect to dispersal distances and the areas most used during dispersal. However, we found no differences between the areas mostly used and those used by other satellite-tracked individuals from other Iberian populations. Furthermore, we did not find significant differences for home ranges or dispersal distances related to sex or marking circumstances (nestling / released). Birds marked as nestlings used different areas from those used by released birds. Juveniles usually remained close to the main breeding areas. Finally, survival rates were very high both during the first year (0.92) and second year (0.70). Five birds were found dead up to July 2014, three of which had been poisoned.

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