Average positions (error bars denote two standard errors) of
(parapatric and allopatric - open circles, sympatric - open square) and
populations (parapatric and allopatric - black circles, sympatric - black square) within two dimensional acoustic PCA space (strongly driven by a variation of starting and lowest frequencies and of frequency range in the highland species
, for summary of loadings see Table
), convex hulls for both species exclude the respective sympatric populations.