Source levels at 1.0 and 0.5 m from target microphone
| Bat(s) | Source level at 1.0 m (dB SPLrms) | Source level at 0.5 m (dB SPLrms) | n (# of approaches) |
|---|---|---|---|
| Bat 1 | 86.8 | 81.0 | 1 |
| Bat 2 | 70.0 ± 1.2 | 65.0 ± 2.2 | 3 |
| Bat 3 | 85.4 ± 0.8 | 78.5 ± 1.0 | 3 |
| Population | 79.0 ± 3.2 | 73.1 ± 3.0 | 7 |
Mean source call levels with SEs at 1.0 and 0.5 m from target microphone. Data from individual bats and the population are shown. Due to no bat having called exactly 1.0 nor 0.5 m from the microphone, for each approach, a logarithmic regression formula obtained from calls emitted between 1.0 and 0.3 m was used to estimate the level of a call at 1.0 or 0.5 m from the microphone. The source level at 0.5 m is lower than at 1 m, because the bats have begun to echo intensity compensate (see Figure 1).