Table 1.

The intensity compensation in four individual Daubenton's bats,expressed as peak and rms SPL (dB decrease per halving of distance from bat to target), for three different target types

IndividualTargetPeak SPLrms SPLNumber of flightsNumber of calls
Small sphere 3.9 5.4 203
Big sphere 4.0 5.5 67
Mealworm 4.4 5.8 185
Small sphere 4.6 5.4 113
Big sphere 3.9 4.8 222
Mealworm 4.0 5.0 253
Small sphere 3.7 5.7 172
Big sphere 2.7 4.6 99
Mealworm 3.5 5.3 232
Small sphere 4.1 4.6 58
Big sphere 4.6 5.5 63
Mealworm 3.8 5.2 73
Total  3.9 5.2 50 1740
S.D.  0.5 0.4
IndividualTargetPeak SPLrms SPLNumber of flightsNumber of calls
Small sphere 3.9 5.4 203
Big sphere 4.0 5.5 67
Mealworm 4.4 5.8 185
Small sphere 4.6 5.4 113
Big sphere 3.9 4.8 222
Mealworm 4.0 5.0 253
Small sphere 3.7 5.7 172
Big sphere 2.7 4.6 99
Mealworm 3.5 5.3 232
Small sphere 4.1 4.6 58
Big sphere 4.6 5.5 63
Mealworm 3.8 5.2 73
Total  3.9 5.2 50 1740
S.D.  0.5 0.4

SPL, sound pressure level; rms, root mean square.

Each of the figures under peak' and rms' is the regression coefficient of the function describing the best fit to the intensities emitted during a specific number of flights, totalling a specific number of calls.

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