CORE
🇺🇦
make metadata, not war
Services
Services overview
Explore all CORE services
Access to raw data
API
Dataset
FastSync
Content discovery
Recommender
Discovery
OAI identifiers
OAI Resolver
Managing content
Dashboard
Bespoke contracts
Consultancy services
Support us
Support us
Membership
Sponsorship
Community governance
Advisory Board
Board of supporters
Research network
About
About us
Our mission
Team
Blog
FAQs
Contact us
Thunks: Evidence for Varied Harmonic Structure In an Atlantic Bottlenose Dolphin (\u3ci\u3eTursiops truncatus\u3c/i\u3e) Sound
Authors
Audra E. Ames
Dianne M. Cameron
+5 more
Stan A. Kuczaj
Rachel T. Walker
Sara J. Wielandt
Kaitlyn L. Witlicki
Maria E. Zapetis
Publication date
1 January 2017
Publisher
The Aquila Digital Community
Abstract
© 2017 International Journal of Comparative Psychology. McCowan and Reiss first reported the “thunk” sound of the Atlantic bottlenose dolphin (Tursiops truncatus) during separations and discipline behavior of mother-calf dyads. This sound has been previously described as a wide-band, low frequency contact call, however the harmonic structure of this sound is more variable than previously described. Based on preliminary observations of the graded structure of thunks within our data set, we investigated the directionality of thunks with energies at higher frequencies. We recorded a bottlenose dolphin mother with her calf during the first 30-days of life, and analyzed thunk production during separation and discipline contexts. Two classifications of the thunk sound were compared to determine calf response and whether location cues were embedded in the higher harmonics of one of the thunk types. The mother oriented towards the calf significantly more during production of both thunk types during separation and discipline contexts. This sound may have potential directional information within the harmonic structure; however, we could not draw that conclusion based on our findings. Therefore, we present data here that indicates a graded structure to the harmonics of thunk sounds. McCowan and Reiss first reported the thunk sound of the Atlantic bottlenose dolphin (Tursiops truncatus) during separations and discipline behavior of mother-calf dyads. However, since this initial report, no other studies have thoroughly investigated this sound. A bottlenose dolphin mother and calf were observed during the first 30 days of life. Thunk production during separations within the mother-calf dyad and discipline behavioral events were analyzed, as thunks were predominately produced in these contexts during the original report by McCowan and Reiss. We found that variation occurs within the thunk sound, contrary to how this acoustic signal has been previously defined. We report the presence of two different types of thunks primarily present in separation events during the calf\u27s early life: the low harmonic range (LHR) and high harmonic range (HHR) thunk. LHR and HHR thunks varied in harmonic structure, but did not have significantly different peak frequencies. Furthermore, in order to determine the salience of the thunk sound to separation and discipline events, we also report on the presence of burst pulses and signature whistles when compared to thunk production. Thunks were the most produced sound during separation events, while burst pulses were more common during the mother\u27s discipline of the calf. The mother\u27s signature whistle was not as common during the course of the study, suggesting that, at least within this bottlenose dolphin mother-calf dyad, other sounds were more important for dyad communication within separation and discipline events
Similar works
Full text
Available Versions
Aquila Digital Community
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:aquila.usm.edu:fac_pubs-19...
Last time updated on 19/04/2021