caa a22 4500 463176103 CHVBK 20180406164826.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s10336-007-0195-4 doi (NATIONALLICENCE)springer-10.1007/s10336-007-0195-4 Sex recognition in brown skuas: do acoustic signals matter? [Elektronische Daten] [Tim Janicke, Markus Ritz, Steffen Hahn, Hans-Ulrich Peter] Bird vocalisations are often essential for sex recognition, especially in species that show little morphological sex dimorphism. Brown skuas (Catharacta antarctica lonnbergi), which exhibit uniform plumage across both sexes, emit three main calls: the long call, the alarm call and the contact call. We tested the potential for sex recognition in brown skua calls of 42 genetically sexed individuals by analysing 8-12 acoustic parameters in the temporal and frequency domains of each call type. For every call type, we failed to find sex differences in any of the acoustic parameters measured. Stepwise discriminant function analysis (DFA) revealed that sexes cannot be unambiguously classified, with increasing uncertainty of correct classification from contact calls to long calls to alarm calls. Consequently, acoustic signalling is probably not the key mechanism for sex recognition in brown skuas. Dt. Ornithologen-Gesellschaft e.V., 2007 Acoustic signalling nationallicence Catharacta antarctica lonnbergi nationallicence Sex recognition nationallicence Vocal sexual dimorphism nationallicence Janicke Tim Polar and Bird Ecology Group, Institute of Ecology, Friedrich-Schiller-University, Dornburger Strasse 159, 07743, Jena, Germany aut Ritz Markus Polar and Bird Ecology Group, Institute of Ecology, Friedrich-Schiller-University, Dornburger Strasse 159, 07743, Jena, Germany aut Hahn Steffen Polar and Bird Ecology Group, Institute of Ecology, Friedrich-Schiller-University, Dornburger Strasse 159, 07743, Jena, Germany aut Peter Hans-Ulrich Polar and Bird Ecology Group, Institute of Ecology, Friedrich-Schiller-University, Dornburger Strasse 159, 07743, Jena, Germany aut Journal of Ornithology Springer-Verlag 148/4(2007-10-01), 565-569 0021-8375 148:4<565 2007 148 10336 https://doi.org/10.1007/s10336-007-0195-4 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10336-007-0195-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Janicke Tim Polar and Bird Ecology Group, Institute of Ecology, Friedrich-Schiller-University, Dornburger Strasse 159, 07743, Jena, Germany aut NATIONALLICENCE 700 1- Ritz Markus Polar and Bird Ecology Group, Institute of Ecology, Friedrich-Schiller-University, Dornburger Strasse 159, 07743, Jena, Germany aut NATIONALLICENCE 700 1- Hahn Steffen Polar and Bird Ecology Group, Institute of Ecology, Friedrich-Schiller-University, Dornburger Strasse 159, 07743, Jena, Germany aut NATIONALLICENCE 700 1- Peter Hans-Ulrich Polar and Bird Ecology Group, Institute of Ecology, Friedrich-Schiller-University, Dornburger Strasse 159, 07743, Jena, Germany aut NATIONALLICENCE 773 0- Journal of Ornithology Springer-Verlag 148/4(2007-10-01), 565-569 0021-8375 148:4<565 2007 148 10336 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer