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Figure 1 | Frontiers in Zoology

Figure 1

From: Behavioural response of a migratory songbird to geographic variation in song and morphology

Figure 1

Geographic variation in the song of stonechats and a control species as quantified by principal component analysis. Shown is (a) the variation in song structure of European Stonechats from (1) the local population, (2) a population from 90 km distance, (3) a population from 180 km distance, (4) African stonechats, and (5) control species (Winter wren) based on a principal component analysis (for details, see Table 1); and (b) factor loadings of the two first principle components for song duration, number of elements, element rate, the minimum, maximum and peak frequency, and the bandwidth. The arrow length indicates the degree, the arrow direction the association of factor loadings with the principal components PC 1 and PC 2.

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