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Table 2.

Summary of the principal components analysis examining variation in the double-whistle and its relation to male mating success

Raw distribution (mean±s.d.)PC1PC2
Frequency difference 578.1±106.6 Hz 0.795 –0.70 
Relative time of termination 0.70±0.11 s 0.181 0.873 
Relative amplitude (scale 0–3) 1.91±0.67 0.807 –0.006 
Proportion with DW 0.68±0.26 0.357 –0.769 
Eigenvalue n.a. 1.583 1.219 
Percentage of variance explained n.a. 39.6 30.4 
Spearman correlation with mating success n.a. –0.182 0.039 
P-value for significance of Spearman correlation n.a. 0.35 0.845 
Raw distribution (mean±s.d.)PC1PC2
Frequency difference 578.1±106.6 Hz 0.795 –0.70 
Relative time of termination 0.70±0.11 s 0.181 0.873 
Relative amplitude (scale 0–3) 1.91±0.67 0.807 –0.006 
Proportion with DW 0.68±0.26 0.357 –0.769 
Eigenvalue n.a. 1.583 1.219 
Percentage of variance explained n.a. 39.6 30.4 
Spearman correlation with mating success n.a. –0.182 0.039 
P-value for significance of Spearman correlation n.a. 0.35 0.845 

DW, double whistle; n.a., not applicable

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