caa a22 4500 463176227 CHVBK 20180406164826.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10336-006-0117-x doi (NATIONALLICENCE)springer-10.1007/s10336-006-0117-x Territorial responses of male blue tits, Cyanistes caeruleus , to UV-manipulated neighbours [Elektronische Daten] [Angelika Poesel, Torben Dabelsteen, Safi-Kirstine Darden, Kaspar Delhey, Anne Peters] Multiple phenotypic traits can affect the outcome of interactions among territorial animals. Individuals may use current and previously acquired information on phenotypic traits to assess the competitive ability of opponents and adjust the strength of their response depending on the threat the opponent poses. In birds, colourful plumage and song are widespread phenotypic traits. Recent work has shown that ultraviolet (UV) plumage reflectance may be used by males in assessing an opponent's strength and by females in mate choice. In the present study, we investigated whether and how territorial male blue tits, Cyanistes caeruleus, use previously acquired information from UV reflectance of the crown feathers of neighbours to adjust their response to playback of song of these neighbours simulated to intrude their territory. We compared responses to neighbours with those to unfamiliar strangers with unknown plumage features. We found that subject males with UV-enhanced neighbours responded more strongly to these neighbours than to strangers, i.e. showed more flights, used songs without trill and tended to overlap more songs. Subject males with UV-reduced neighbours gave a lower or similar response to neighbours compared to strangers. This indicates that male blue tits combine previously acquired information about an intruder's plumage with familiarity of its song, and that their response depends on the perceived quality of the neighbour. This study provides evidence that familiarity in combination with multiple signals of quality may influence territorial relations among neighbours. Dt. Ornithologen-Gesellschaft e.V., 2006 Cyanistes caeruleus nationallicence Intra-sexual signal nationallicence Playback intrusion nationallicence Structural plumage colouration nationallicence Poesel Angelika Animal Behaviour Group, Biological Institute, Tagensvej 16, 2200, Copenhagen, Denmark aut Dabelsteen Torben Animal Behaviour Group, Biological Institute, Tagensvej 16, 2200, Copenhagen, Denmark aut Darden Safi-Kirstine Animal Behaviour Group, Biological Institute, Tagensvej 16, 2200, Copenhagen, Denmark aut Delhey Kaspar Max Planck Institute for Ornithology Vogelwarte Radolfzell, Schlossallee 2, 78315, Radolfzell, Germany aut Peters Anne Max Planck Institute for Ornithology Vogelwarte Radolfzell, Schlossallee 2, 78315, Radolfzell, Germany aut Journal of Ornithology Springer-Verlag 148/2(2007-04-01), 179-187 0021-8375 148:2<179 2007 148 10336 https://doi.org/10.1007/s10336-006-0117-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10336-006-0117-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Poesel Angelika Animal Behaviour Group, Biological Institute, Tagensvej 16, 2200, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Dabelsteen Torben Animal Behaviour Group, Biological Institute, Tagensvej 16, 2200, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Darden Safi-Kirstine Animal Behaviour Group, Biological Institute, Tagensvej 16, 2200, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Delhey Kaspar Max Planck Institute for Ornithology Vogelwarte Radolfzell, Schlossallee 2, 78315, Radolfzell, Germany aut NATIONALLICENCE 700 1- Peters Anne Max Planck Institute for Ornithology Vogelwarte Radolfzell, Schlossallee 2, 78315, Radolfzell, Germany aut NATIONALLICENCE 773 0- Journal of Ornithology Springer-Verlag 148/2(2007-04-01), 179-187 0021-8375 148:2<179 2007 148 10336 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer