Replication Data for: Acoustic occurrence of deep-diving cetaceans in the southern Adriatic Sea

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Constaratas, Alexandra Nathalie; Holcer, Draško; Özgöbek, Özlem; Širović, Ana, 2025, "Replication Data for: Acoustic occurrence of deep-diving cetaceans in the southern Adriatic Sea", https://doi.org/10.18710/38HOYX, DataverseNO, V1
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Description
Goose-beaked whale (Ziphius cavirostris) and sperm whale (Physeter macrocephalus) are two deep-diving odontocete species known to occur in the southern Adriatic Sea, based on intermittent stranding and sighting data. To get a better understanding of their presence in this region, we studied the occurrence of echolocation clicks produced by these species in passive acoustic recordings. Passive acoustic data were collected offshore Dubrovnik, Croatia. Data were collected from October 2018 to December 2019 and from June 2020 to December 2020 using a High-frequency Acoustic Recording Package (HARP) deployed at approximately 1,000 m depth. To determine the occurrence of echolocation clicks, a two-step process was used: automated detection followed by manual annotation of the detected clicks. Automated detection was implemented using a low signal-to-noise ratio threshold and a broad range of parameters to detect as many clicks as possible. Two click clustering algorithms were evaluated for performance on this data set: an unsupervised clustering algorithm and a filtering algorithm. The performance of the algorithms was compared to the manual annotations to determine a time-effective method for future monitoring. Both species were found to be acoustically active in the southern Adriatic Sea. Goose-beaked whales were detected throughout the recording period, with echolocation clicks peaking during the winter of 2018–2019 and in the spring of 2019. Conversely, sperm whales were more acoustically active during short, irregular windows, mostly during the summer of 2019. These results suggest that goose-beaked whales are residents, and, due to the irregularity of their detection, sperm whales are likely occasional visitors to this region. The unsupervised clustering algorithm performed better than the tested filtering algorithm, with F-scores of 0.74 and 0.46, respectively. This study provides knowledge that can help with effective conservation efforts and further contribute to our understanding of cetacean occurrence in the region. (2025-01-09)
Subject Earth and Environmental Sciences
Keyword acoustic occurrence, Cuvier's beaked whale, echolocation clicks, goose-beaked whale, passive acoustic monitoring, Physeter macrocephalus, southern Adriatic Sea, sperm whale, Ziphius cavirostris
Related Publication Constaratas, A. N., Holcer, D., Özgöbek, Ö., & Širović, A. (2024). Acoustic occurrenceof deep-diving cetaceans in the southern Adriatic Sea. Marine Mammal Science, e13204. https://doi.org/10.1111/mms.13204 doi: 10.1111/mms.13204
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00_README.txt
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Published Jan 10, 2025
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ADRIA_JD_01.zip
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MD5: 756800186c63d84a3b00ca6c61f21591
Folder with files containing start and end times of detected clicks for the first recording period (from 10-18-18 to 05-05-19).
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ADRIA_JD_01_annot.mat
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MD5: 2d64834b1fd1bd8b44a35e9eadf68148
Timestamps of annotated clicks for the first recording period (from 10-18-18 to 05-05-19).
ADRIA_JD_01_TPWS.mat
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MD5: 9a073f41fec8624ed6c28305a92e997e
TPWS stands for "start Time, Peak-to-peak amplitude, Waveform, and Spectra parameters", therefore giving start times of detections, received level amplitudes (dBpeak-to-peak), waveforms and detection spectra of the detected clicks for the first recording period (from 10-18-18 to 05-05-19).
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Folder with files containing start and end times of detected clicks for the second recording period (from 06-05-19 to 12-23-19).
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ADRIA_JD_02_annot.mat
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Timestamps of annotated clicks for the second recording period (from 06-05-19 to 12-23-19).
ADRIA_JD_02_TPWS.mat
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MD5: d36f3fff0968c858c962f2fcbf750d3f
TPWS stands for "start Time, Peak-to-peak amplitude, Waveform, and Spectra parameters", therefore giving start times of detections, received level amplitudes (dBpeak-to-peak), waveforms and detection spectra of the detected clicks for the second recording period (from 06-05-19 to 12-23-19).
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Folder with files containing start and end times of detected clicks for the third recording period (from 06-09-20 to 12-22-20).
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ADRIA_JD_03_annot.mat
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Timestamps of annotated clicks for the third recording period (from 06-09-20 to 12-22-20).
ADRIA_JD_03_TPWS.mat
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Published Jan 10, 2025
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MD5: 0dd025ba94b157b7b7e32a70a24bceb2
TPWS stands for "start Time, Peak-to-peak amplitude, Waveform, and Spectra parameters", therefore giving start times of detections, received level amplitudes (dBpeak-to-peak), waveforms and detection spectra of the detected clicks for the third recording period (from 06-09-20 to 12-22-20).
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