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Harbour porpoises are best monitored using underwater acoustic dataloggers, which record the echolocation clicks used for navigation and foraging. This study looked at the most frequently used devices to record these animals and devised an experiment that allowed researchers to determine the range of loggers -- something that previously hasn't been known.
This was done by playing back artificial and real, recorded harbour porpoise echolocation clicks to a number of recorders at varying distances and sound source levels.
Researchers - Proportion - Sounds - Device - Distance
This allowed researchers to estimate the proportion of all the sounds that were captured by the device, and assess how this was affected by distance from the sound source to the recorder.
The maximum distance the recorder captured porpoise sounds was 566m, however the mean effective detection range (EDR) of a raw signal was calculated at just under 200m and those classified as porpoises by...
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