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Fig. 4 | Avian Research

Fig. 4

From: Song divergence indicates an unclear relationship between the Neotropical and Nearctic Horned Larks

Fig. 4

Differences in the playback response to the Nearctic, Neotropical, and control (Rufous-collared Sparrow) stimuli. a Boxplot of each variable evaluated. b Boxplot of the response intensity variable (PC1). Lower PC1 values indicate a stronger response as it reflects a faster and closer approach with more reply vocalizations. Also, we show the PC1 vs PC2 scatterplot. The ellipses of the scatter plot were calculated automatically in the R software using the option of concentration ellipses (.5.8 degree). ** = p < 0.005; *** = p < 0.001

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