Figure 2.

(a) Plumbeous vireo minimum frequency (black circles and solid line) and grey vireo maximum frequency (open squares and dashed line) increased with noise exposure. Horizontal solid and dashed lines denote mean values for plumbeous vireo maximum frequency and grey vireo minimum frequency, respectively. Vertical lines illustrate the change in bandwidth with increased noise exposure (plumbeous, dashed grey lines; grey, solid grey lines). (b) Plumbeous vireo song duration decreased with increased noise and grey vireo song duration increased (symbols as in (a)).