Table 1

Quartiles of the acoustic parameters measured from the advertisement calls and their loadings on the principal components
Acoustic parameter Quartiles Component loadings
25 50 75 Component 1 Component 2
Frequency range of modulation six 11428.00 13143.00 14286.00 .858 .096
Frequency range of modulation five 11066.00 12653.00 14286.00 .852 -.053
Max. frequency of third modulation from end 19518.50 21633.00 23306.00 .845 -.266
Max. frequency of the modulation before the end 15918.00 17714.00 20000.00 .843 -.373
Max. frequency of the second modulation from the end 17193.00 19429.00 21857.00 .835 -.371
Frequency range of modulation four 10235.50 12000.00 13714.25 .823 -.151
Frequency range of modulation seven 11228.00 13265.50 14694.00 .800 .197
Max. frequency of end modulation 14286.00 15510.00 16612.00 .799 -.246
Frequency range of the third modulation from the end 5714.75 7975.00 10428.00 .762 -.438
Fundamental frequency of the end 11719.00 13086.00 14697.00 .750 -.093
Frequency range of the third modulation 8421.00 10857.00 13143.00 .733 -.372
Duration of third modulation from the end 8.00 10.00 13.00 .718 -.037
Frequency range of the second modulation from the end 4543.25 6216.50 9316.50 .711 -.551
Fundamental frequency of the start 20325.00 23499.00 24853.75 .704 .572
Duration of the modulation before the end 7.00 9.00 13.00 .687 -.211
Duration of the second modulation before the end 7.75 10.00 12.00 .682 -.177
Frequency range of the modulation before the end 3265.75 4905.00 8164.00 .676 -.575
Duration of modulation four 11.00 13.00 14.00 .669 -.153
Duration of the end modulation 5.00 10.00 13.00 .652 -.452
Duration of modulation six 12.00 13.00 15.00 .620 -.031
Number of modulations 18.00 20.00 23.00 -.620 .057
Frequency range of the end modulation 2844.50 3844.00 6129.00 .613 -.584
Duration of modulation five 11.75 13.00 14.25 .596 -.148
Time until the turning point 36.00 42.00 53.25 -.561 .021
Frequency range of modulation two 6939.00 8496.00 11275.75 .553 -.513
Duration of modulation seven 12.00 13.00 15.00 .541 .094
Duration of modulation three 11.00 12.00 13.00 .536 -.074
Duration of modulation two 10.00 11.50 13.00 .519 -.440
Time until the call's maximum 68.75 78.50 89.25 -.434 -.127
Call duration 594.75 656.50 734.75 -.406 -.133
Duration of modulation one 8.00 10.00 11.00 .252 -.070
Peak frequency of the end 12219.50 13513.50 15997.25 .250 .107
Max. frequency of modulation three 27551.00 31143.00 33917.25 .399 .886
Max. frequency of modulation two 29478.00 32571.00 35714.00 .407 .868
Max. frequency of modulation four 26639.00 29959.00 32245.00 .481 .835
Max. frequency of modulation five 26286.00 29714.00 31020.00 .548 .779
Fundamental frequency of the turning point 21851.00 24078.50 26739.25 .345 .756
Max. frequency of modulation one 31358.75 34286.00 37143.00 .546 .752
Max. frequency of modulation six 26046.50 28775.50 30367.50 .583 .746
Max. frequency of modulation seven 25410.00 28367.00 29592.00 .574 .739
Fundamental frequency of the maximum 27466.00 31372.00 34081.75 .505 .737
Peak frequency of the maximum 27881.00 31787.00 34668.00 .128 .622
Peak frequency of the turning point 21851.00 24373.50 27197.00 .281 .561
Peak frequency of the start 20508.00 24292.00 28284.00 .120 .458
Frequency range of modulation one 4571.00 5714.00 7194.00 .301 -.391

Frequency is measured in Herz and time in milliseconds. Components 1 and 2 are 37% and 22% of the variation, respectively.

Kessler et al.

Kessler et al. BMC Ecology 2012 12:26   doi:10.1186/1472-6785-12-26

Open Data