Table 1.
Comparison of competing models for change in male response and mean response with and without the interaction term using AICc and ΔAICc.
Fig 1.
Male house wrens did not differ in the delay from beginning of playbacks to their first songs based on treatment (n = 12 intruder alone, n = 15 intruder plus noise, n = 18 noise alone).
Fig 2.
In response to an intruder, (A) male house wrens increase song peak frequency (Hz) during an intrusion with (n = 13) and without noise (n = 12), and but decreased peak frequency in response to noise alone (n = 8) compared to pre-playback control periods. (B) On average males sing at a higher peak frequency during an intrusion without noise (n = 13) compared to the noise only treatment (n = 14). Male responses to an intruder with noise (n = 13) did not differ from either the noise only or intruder only treatment. Breeding stage was not a significant predictor of song peak frequency.
Fig 3.
Male house wrens increased singing rate (A) in response to an intruder with (n = 12) and without noise (n = 15), but they did not change singing rate in noise (n = 18) compared to pre-playback control periods. (B) On average males sang at a higher rate when an intruder was present, regardless of whether or not noise was played, than during noise playback alone.
Fig 4.
(A) Treatment did not influence change in song duration. (B) During later breeding stages, males increased their song duration in response to treatments (n = 13 intruder alone, n = 12 intruder with noise, n = 14 noise alone), whereas males during early stages overall did not increase their song duration.
Table 2.
Change in song trait by male house wrens in response to a simulated intruder with and without noise, and to noise alone.
Fig 5.
(A) Mean song duration was longer in response to an intruder with (n = 13) and without noise (n = 13) compared to noise alone (n = 14). (B) During early breeding stages (n = 16) males sang longer songs compared to later stages (n = 24).
Table 3.
Mean song trait response by male house wrens in response to a simulated intruder with and without noise, and to noise alone.
Fig 6.
Males attacked the playback speaker more during an intrusion with noise (n = 14) compared to an intruder alone (n = 12; (A)), treatment did not affect the number of fly overs towards the speaker (B).