(Table 1) Mean statistics for acoustic parameters measured for both brown skua (Catharacta antarctica lonnbergi) sexes ...

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....

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Bibliographic Details
Main Authors: Janicke, Tim, Ritz, Markus S, Hahn, Steffen, Peter, Hans-Ulrich
Format: Dataset
Language:English
Published: PANGAEA 2015
Subjects:
Species
Species, common name
Sex
Relief type
Number
Standard deviation
Duration
Repetition rate
Percentage
Time in seconds
Amplitude
Amplitude, standard deviation
Frequency
Frequency, standard deviation
Bandwidth
Bandwidth, standard deviation
Biological sample
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158
Arctic
Antarctic
Antarc*
Antarctica
Brown Skua
Sea ice
Online Access:https://dx.doi.org/10.1594/pangaea.848403
https://doi.pangaea.de/10.1594/PANGAEA.848403
Description
Summary: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. ... : Note that Catharacta antarctica lonnbergi is more officially called Stercorarius lonnbergi. ...

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