Badás, E. P.
Martínez, J.
Rivero-de Aguilar, J.
Ponce, C.
Stevens, M.
Merino, S.
Funding for this research was provided by:
Ministerio de Economía y Competitividad (CGL2012-40026-C02-01, CGL2012-40026-C02-02)
Article History
Received: 21 July 2017
Revised: 27 October 2017
Accepted: 11 January 2018
First Online: 6 February 2018
Compliance with ethical standards
: The Junta de Castilla y León authorised the ringing and handling of blue tits in the study area (protocol number EP/SG/193/2013). All researchers manipulating birds held a specific ringing permit. Work in the field area was done with permission from J. Donés (Director of ‘Montes de Valsain’).