RT Journal Article T1 Adventitious feather replacement favours amore rapid regeneration of primaries over rectrices in two passerine bird species A1 Hera Fernández, Iván de la A1 Pérez Tris, Javier A1 Tellería Jorge, José Luis AB There is increasing evidence of adaptive preferential investment during moult in those feather tracts that are more advantageous for fitness. In this study, we assessed whether, after the manual removal of two functionally different flight feathers (one primary and one rectrix), birds from two common passerine species (Eurasian Blackcap Sylvia atricapillaand European Robin Erithacus rubecula) favoured the regeneration of primary (supposedly the most functionally important feathers) over rectrix feathers. Our results did not show differences between replaced primary and rectrix feathers in their final length, but demonstrated that the gap left by the loss of the primary feather was filled earlier, suggesting that a rapid repair of the most essential feather tracts is also evolutionarily advantageous during the adventitious replacement of plumage. PB Wiley SN 0019-1019, ESSN: 1474-919X YR 2015 FD 2015-10 LK https://hdl.handle.net/20.500.14352/23205 UL https://hdl.handle.net/20.500.14352/23205 LA eng NO Ministerio de Ciencia y Tecnología NO Gobierno vasco. Departamento de Educación, Universidades e Investigación DS Docta Complutense RD 11 abr 2025