Dataset of Bottlenose Dolphin Acoustic Recordings from Boat-Based Encounters Using HydroMoth Devices, Event 006 (2024-12-01)

Data Records

The data in this sampling event resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 1 records.

3 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.

Versions

The table below shows only published versions of the resource that are publicly accessible.

How to cite

Researchers should cite this work as follows:

Chaparro Elias, L., Rodero, C., Marco, N., Giralt Paradell, O., EMBIMOS research group (ICM-CSIC), & Associació Cetàcea. (2025). Dataset of Bottlenose Dolphin Acoustic Recordings from Boat-Based Encounters Using HydroMoth Devices, Event 006 (2024-12-01) (v3.0.0) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.17534727

Rights

Researchers should respect the following rights statement:

The publisher and rights holder of this work is Institut de Ciències del Mar (CSIC). This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC 4.0) License.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 203112b0-8279-48c1-8bad-7e119bf64171.  Institut de Ciències del Mar (CSIC) publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Spain.

Keywords

Bioacoustics; Underwater recordings; Cetacean vocalisations; Tursiops truncatus; HydroMoth; Passive acoustic monitoring; PAMGuard; ROCCA; Citizen science; Open source; Data flow; Costes del Garraf; Samplingevent

Contacts

Geographic Coverage

Costes del Garraf, Catalonia, Spain (NW Mediterranean). Natura 2000: ES5110020. Representative coordinates: 41°08′13.18″N, 1°45′03.22″E.

Taxonomic Coverage

scientificName: Tursiops truncatus taxonRank: species kingdom: Animalia phylum: Chordata class: Mammalia order: Cetacea family: Delphinidae genus: Tursiops species: Tursiops truncatus

Temporal Coverage

Project Data

Participatory bioacoustics pilot linking Zenodo (media) and GBIF DwC-A (tables) to support FAIR data sharing for odontocete acoustics.

The personnel involved in the project:

Sampling Methods

The HydroMoth (Open Acoustic Devices) was configured for broadband recording at 250 kHz (Medium gain) with a 0.5–125 kHz band-pass filter and duty-cycled recording (300 s record / 5 s sleep). Data and metadata were structured for publication as a Darwin Core Archive (DwC-A). Because the device was not acoustically calibrated, amplitudes are expressed as relative dB FS (peak-to-peak) rather than absolute levels (dB re 1 µPa).

Method step description:

1. Analysis: The audio files were screened in Audacity 3.7.5 to identify potential signal saturation (clipping). Two label types were created: HardClip (0 dBFS) and NearClip (−0.5 dBFS). Downstream analyses masked ±5 ms around these intervals. The audio was processed with PAMGuard v2.02.16 using two main modules: the Click Detector to detect clicks and ROCCA to visualise and select whistles. To obtain the actual (“real”) number of clicks, PAMGuard detections were cross-checked against the Audacity clipping labels. Real clicks were defined as those with a representative inter-click interval (ICI) of 0.5–100 ms and occurring outside the ±5 ms windows around NearClip/HardClip labels. Further methodological details are provided in the Zenodo record (DOI: 10.5281/zenodo.17534727).
2. Data structure and access: The dataset is distributed as a Darwin Core Archive (DwC-A) containing Event, Occurrence, ExtendedMeasurementOrFact (eMoF) and SimpleMultimedia, along with meta.xml and the EML. SimpleMultimedia entries resolve to Zenodo, where all raw audio (WAV), PAMGuard project, configuration files and figures are preserved to support FAIR discovery and reuse. Linkage to the core follows the standard DwC convention in which each extension uses coreID = eventID (Zenodo DOI: 10.5281/zenodo.17534727).
3. Key numerical results from the eight-minute segment analysed: Whistles: A total of 92 whistles were validated, with minimum–maximum frequencies between 7.6–13.0 kHz. These included convex, ascending and quasi-constant contours with harmonics. Clicks: PAMGuard automatically detected 21,853 clicks, of which 20,217 met the criteria for real clicks. Their mean relative amplitude was 134.99 dB FS (p-p) (relative, non-calibrated units). Based on representative ICIs, real clicks were classified as: Burst pulses (ICI ≤ 3 ms): 70%; Click trains (3 < ICI ≤ 10 ms): 13%; and Echolocation clicks (10 < ICI ≤ 100 ms): 17%. All metrics are included in the eMoF table.

Bibliographic Citations

1. Audacity (Version 3.7.5). Audacity Team. Free, open‑source, cross‑platform audio software.
2. AudioMoth Firmware Basic v1.11.0 (Open Acoustic Devices).
3. JASP (Version 0.95.4). JASP Team. Free and open statistics package.
4. PAMGuard (Version 2.02.16). Open-source platform for passive acoustic monitoring (Gillespie et al., 2008).
5. Raven Lite (Version 2.0.5). K. Lisa Yang Center for Conservation Bioacoustics at the Cornell Lab of Ornithology. Interactive sound analysis software for bioacoustics.

Additional Metadata