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Janicke, Tim; Ritz, Markus S; Hahn, Steffen; Peter, Hans-Ulrich (2015): (Table 1) Mean statistics for acoustic parameters measured for both brown skua (Catharacta antarctica lonnbergi) sexes [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.848403, Supplement to: Janicke, T et al. (2007): Sex recognition in brown skuas: do acoustic signals matter? Journal of Ornithology, 148(4), 565-569, https://doi.org/10.1007/s10336-007-0195-4

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Abstract:
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.
Project(s):
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas (SPP1158)
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Latitude: -62.250000 * Longitude: -58.670000
Event(s):
Potter_Pen * Latitude: -62.250000 * Longitude: -58.670000 * Location: Potter Peninsula, King George Island, Western Antarctica * Method/Device: Biological sample (BIOS)
Comment:
Note that Catharacta antarctica lonnbergi is more officially called Stercorarius lonnbergi.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 SpeciesSpeciesJanicke, Tim
2 Species, common nameSpecies commonJanicke, Tim
3 SexSexJanicke, Tim
4 Relief typeRelief typeJanicke, Tim
5 Numbern#Janicke, Timof notes (call composition)
6 Standard deviationStd dev±Janicke, Timnumber of notes
7 DurationDurationsJanicke, Timtotal
8 Standard deviationStd dev±Janicke, Timtotal duration
9 DurationDurationsJanicke, Timof note
10 Standard deviationStd dev±Janicke, Timnote duration
11 Repetition rateRep rate#/sJanicke, Timof notes
12 Standard deviationStd dev±Janicke, Timnote repetition rate
13 PercentagePerc%Janicke, Timpeak performance
14 Standard deviationStd dev±Janicke, Tim% peak performance
15 Time in secondsTimesJanicke, Timdistance to maximum amplitude
16 Standard deviationStd dev±Janicke, Timdistance to max amplitude
17 AmplitudeAmplitudeJanicke, Timin dB
18 Amplitude, standard deviationAmplitude std dev±Janicke, Tim
19 FrequencyFreqHzJanicke, Timpeak
20 Frequency, standard deviationFreq std dev±Janicke, Timpeak
21 FrequencyFreqHzJanicke, Timmean
22 Frequency, standard deviationFreq std dev±Janicke, Timmean
23 FrequencyFreqHzJanicke, Timmin
24 Frequency, standard deviationFreq std dev±Janicke, Timmin
25 FrequencyFreqHzJanicke, Timmax
26 Frequency, standard deviationFreq std dev±Janicke, Timmax
27 BandwidthBandwidthHzJanicke, Tim
28 Bandwidth, standard deviationBandwidth std dev±Janicke, Tim
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
136 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Species		2 
Species common		3 
Sex		4 
Relief type		5 
n [#]
(of notes (call composition))		6 
Std dev [±]
(number of notes)		7 
Duration [s]
(total)		8 
Std dev [±]
(total duration)		9 
Duration [s]
(of note)		10 
Std dev [±]
(note duration)		11 
Rep rate [#/s]
(of notes)		12 
Std dev [±]
(note repetition rate)		13 
Perc [%]
(peak performance)		14 
Std dev [±]
(% peak performance)		15 
Time [s]
(distance to maximum amplitude)		16 
Std dev [±]
(distance to max amplitude)		17 
Amplitude
(in dB)		18 
Amplitude std dev [±]		19 
Freq [Hz]
(peak)		20 
Freq std dev [±]
(peak)		21 
Freq [Hz]
(mean)		22 
Freq std dev [±]
(mean)		23 
Freq [Hz]
(min)		24 
Freq std dev [±]
(min)		25 
Freq [Hz]
(max)		26 
Freq std dev [±]
(max)		27 
Bandwidth [Hz]		28 
Bandwidth std dev [±]
Catharacta antarctica lonnbergiBrown skuaMalesLong calls9.882.274.011.060.190.032.380.3039.844.600.040.03-23.006.062224.86516.152610.93242.56901.44296.635185.56932.414154.641426.86
Catharacta antarctica lonnbergiBrown skuaFemalesLong calls10.083.214.211.490.190.032.300.1736.846.380.040.03-21.686.362025.82568.502563.59312.41848.11307.505047.981071.774380.941366.03
Catharacta antarctica lonnbergiBrown skuaMalesAlarm calls0.590.130.080.09-21.964.651313.36253.841629.23196.49637.51237.003163.571092.002521.351210.40
Catharacta antarctica lonnbergiBrown skuaFemalesAlarm calls0.600.110.100.10-21.274.301259.85216.551572.78212.65639.91184.433029.231015.032385.271096.29
Catharacta antarctica lonnbergiBrown skuaMalesContact calls0.100.030.040.02-21.433.881263.62382.991673.28252.54475.95191.383437.72940.842957.00956.96
Catharacta antarctica lonnbergiBrown skuaFemalesContact calls0.120.050.040.02-19.453.241255.78225.041669.13244.65401.31102.863443.20947.953038.59971.61