Cetacean Acoustics

Au, Whitlow W. L.; Lammers, Marc O.

doi:10.1007/978-0-387-30425-0_20

Cited by 4 publications

(1 citation statement)

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“…The use of lower frequencies also seems a possibility for research on Tursiops truncatus , which has broadband echolocation clicks [ 30 – 32 ]. Their echolocations occur from audible frequencies (less than 20 kHz) to at least 150 kHz [ 33 ]. However, there are no studies that describe the proportion of echolocation clicks that occur in different frequencies through this frequency range, or how efficient lower sampling rates are to record these clicks of free-living animals.…”

Section: Introductionmentioning

confidence: 99%

Low-frequency sampling rates are effective to record bottlenose dolphins

et al. 2021

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Acoustic monitoring in cetacean studies is an effective but expensive approach. This is partly because of the high sampling rate required by acoustic devices when recording high-frequency echolocation clicks. However, the proportion of echolocation clicks recorded at different frequencies is unknown for many species, including bottlenose dolphins. Here, we investigated the echolocation clicks of two subspecies of bottlenose dolphins in the western South Atlantic Ocean. The possibility of recording echolocation clicks at 24 and 48 kHz was assessed by two approaches. First, we considered the clicks in the frequency range up to 96 kHz. We found a loss of 0.95–13.90% of echolocation clicks in the frequency range below 24 kHz, and 0.01–0.42% below 48 kHz, to each subspecies. Then, we evaluated these recordings downsampled at 48 and 96 kHz and confirmed that echolocation clicks are recorded at these lower frequencies, with some loss. Therefore, despite reaching high frequencies, the clicks can also be recorded at lower frequencies because echolocation clicks from bottlenose dolphins are broadband. We concluded that ecological studies based on the presence–absence data are still effective for bottlenose dolphins when acoustic devices with a limited sampling rate are used.

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Section: Introductionmentioning

confidence: 99%