Table 1. Principal component analysis summarizing variation in advertisement calls of Oophaga histrionica (Oh-Stream, Oh-Away, Oh-Hybrid) and O. lehmanni (Ol-Away, Ol-Stream).
| Principal component | |||
| Call variables | PC1 | PC2 | PC3 |
| Median peak frequency (Hz) | 0.954 | −0.188 | 0.072 |
| Final peak frequency (Hz) | 0.922 | −0.062 | 0.036 |
| Initial peak frequency (Hz) | 0.888 | −0.182 | 0.175 |
| Call duration (ms) | −0.107 | 0.941 | −0.267 |
| Median cycle duration (ms) | −0.043 | 0.784 | 0.125 |
| Final cycle duration (ms) | −0.353 | 0.778 | −0.079 |
| Pulse number | −0.029 | 0.348 | −0.883 |
| Initial cycle duration (ms) | 0.178 | 0.170 | 0.876 |
| Eigenvalue | 3.556 | 1.717 | 1.452 |
| % of variance explained | 34.010 | 29.094 | 20.962 |
The highest loadings for each principal component are Value >0.7.