Table 1.

Results from regression analyses using background noise amplitude to predict spectral characteristics for ash-throated flycatcher song (n = 26) and call (n = 21). (Significant values, after Bonferroni correction was applied for multiple comparisons, are indicated with asterisks. See table S1 in the electronic supplementary material for complete results for the grey flycatcher.)

	song		call
spectral feature	r2	p	r2	p
minimum frequency	0.123	0.045	0.382	0.002*
maximum frequency	0.024	0.216	0.042	0.670
peak frequency	0.091	0.073	0.052	0.932
lowest note peak frequency	0.304	0.002*	0.296	0.006*
bandwidth	0.033	0.657	0.261	0.010*