Data from: Heaviside's dolphins (Cephalorhynchus heavisidii) relax acoustic crypsis to increase communication range ...

• Main Authors: Martin, Morgan J., Gridley, Tess, Elwen, Simon H., Jensen, Frants H.
• Format: Dataset
• Language: English
• Published: Dryad 2018
• Subjects: active space; narrowband high-frequency clicks; Heaviside's dolphin; present; Holocene; acoustic crypsis; Cephalorhynchus heavisidii; toothed whales
• Online Access: https://dx.doi.org/10.5061/dryad.64048p0; https://datadryad.org/stash/dataset/doi:10.5061/dryad.64048p0

The costs of predation may exert significant pressure on the mode of communication used by an animal, and many species balance the benefits of communication (e.g. mate attraction) against the potential risk of predation. Four groups of toothed whales have independently evolved narrowband high-frequency (NBHF) echolocation signals. These signals help NBHF species avoid predation through acoustic crypsis by echolocating and communicating at frequencies inaudible to predators such as mammal-eating killer whales. Heaviside’s dolphins (Cephalorhynchus heavisidii) are thought to exclusively produce NBHF echolocation clicks with a centroid frequency around 125 kHz and little to no energy below 100 kHz. To test this, we recorded wild Heaviside’s dolphins in a sheltered bay in Namibia. We demonstrate that Heaviside’s dolphins produce a second type of click with lower frequency and broader bandwidth in a frequency range that is audible to killer whales. These clicks are used in burst-pulses and occasional click series ... : Martin et al. 2018 Supplementary Data from Heaviside's dolphins (Cephalorhynchus heavisidii) relax acoustic crypsis to increase communication rangeThis .wav file includes an example of each pulsed signal type described for Heaviside's dolphins in Martin et al. 2018. The signal types are in the order: 1) broadband click train, 2) burst-pulse, 3) buzz and 4) NBHF click train.Martin et al. 2018 Supplementary Data.wavMartin et al. 2018 Supplementary Methods from Heaviside's dolphins (Cephalorhynchus heavisidii) relax acoustic crypsis to increase communication rangeSupplementary Methods contain details about the statistical analyses used to classify the pulsed signal types of Heaviside's dolphins. Also, methods include the steps and figures used to model the active space of a NBHF click compared to a click extracted from a lower-frequency burst-pulse signal.Martin et al 2018 Supplementary Methods.pdfMartin et al. 2018 Appendix S1 from Heaviside’s dolphins (Cephalorhynchus heavisidii) relax acoustic crypsis to ...