The causes and evolutionary consequences of mixed singing in two hybridizing songbird species (Luscinia spp.).

The differences in the proportion of identified heterospecific song types between sympatric and allopatric Thrush Nightingale males were highly significant (GLM, DF1 = 1, DF2 = 15, F = 25.94, p = 0.00013), as was the difference in the proportion of Common Nightingale song types in repertoires of sympatric Thrush Nightingale and Common Nightingale males (GLM, DF1 = 1, DF2 = 15, F = 14.56, p = 0.0016).

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Thus, there was a clear trend that intermediate-phenotype males use higher proportion of identified Common Nightingale song types than sympatric Thrush Nightingale males, although marginally non-significant (GLM, DF1 = 1, DF2 = 12, F = 4.63, p = 0.052).

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