Data from: Low frequency sampling rates are effective to record bottlenose dolphins ...
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 recording echolocation clicks at different frequencies is unknow...
| Main Authors: | , , , , , |
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| Format: | Dataset |
| Language: | English |
| Published: |
Dryad
2020
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.5061/dryad.4f4qrfj99 https://datadryad.org/stash/dataset/doi:10.5061/dryad.4f4qrfj99 |
| Summary: | 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 recording echolocation clicks at different frequencies is unknown for many species, including bottlenose dolphins. Here, we investigated the echolocation clicks for two subspecies of bottlenose dolphins in the western South Atlantic Ocean. The possibility of record 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 ... : Data sampling Echolocation clicks of two bottlenose dolphin subspecies that occur across different environments in the western South Atlantic Ocean (wSAO) were analyzed. These were Tursiops truncatus truncatus, which are found in open waters, and T. t. gephyreus, which are found in coastal areas. We collected T. t. gephyreus data from the lagoon system adjacent to Laguna (28º20’S, 48º50’ W), southern Brazil. This lagoon system has depths of between 0.4 and 13 m, with an average depth of 1.8 m. The data were collected from December 4th to 12th, 2017, using a 4.4 m inflatable research boat with a 30 hp outboard engine. The recordings were made with the engine off at sites with depths of 2.5 to 5.0 m. The hydrophone was positioned 1.5 m from the surface and 15 groups were sampled using recordings that lasted around 4 to 34 min. Each sampled group contained two to seven dolphins that were displaying travel or foraging behavior. The T. t. truncatus were opportunistically recorded in open waters by the Cetaceans ... |
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