Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (Re1733/6-1; SCHA1008/8-1)
Alexander von Humboldt-Stiftung (Postdoctoral Grant)
Consejo Nacional de Ciencia y Tecnología, Guatemala (CB-2011-01-168524)
Junta de Extremadura (IB16121)
Spanish Ministry of Economy and Competitiveness (CGL2015-64650P)
Received: 12 January 2020
Accepted: 11 August 2020
First Online: 19 August 2020
Ethics approval and consent to participate
: All bird handling procedures, particularly capture and drawing blood, were performed in compliance with laws and regulations of the German federal and Brandenburg state regulations (Bundesnaturschutzgesetz, BNatSchG, Federal Act for the Protection of Nature). Permits were granted by the Landesamt für Umwelt, Gesundheit und Verbraucherschutz, Potsdam (animal protection permit number: Para-Aves, 2347-3-2014 and capture permit for birds RO/4610/SOB-0907D).
: Not applicable.