dc.contributor.author |
Martin, Morgan Jennifer
|
|
dc.contributor.author |
Elwen, Simon Harvey
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|
dc.contributor.author |
Kassanjee, Reshma
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|
dc.contributor.author |
Gridley, Tess
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dc.date.accessioned |
2019-08-12T13:34:37Z |
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dc.date.issued |
2019-04 |
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dc.description |
Supplementary material: Video S1. A group of Heaviside's dolphins socializing at the study site, Shearwater Bay, Namibia. This video was recorded by the land observer team. Video credit: Jeff Slater. |
en_ZA |
dc.description |
The data are available at https://data.mendeley.com/datasets/rvt2byb7px/draft?a=ced7ef2c-717c-43d0-906f-fccf871bb069. |
en_ZA |
dc.description.abstract |
Four groups of toothed whales have independently evolved to produce narrowband high-frequency (NBHF) echolocation signals (i.e. clicks) with a strikingly similar waveform and centroid frequency around 125 kHz. These signals are thought to help NBHF species avoid predation by echolocating and communicating at frequencies inaudible to predators, a form of acoustic crypsis. Heaviside's dolphins produce NBHF echolocation clicks in trains and often in rapid succession in the form of buzzes. In addition, a second click type with a lower frequency and broader bandwidth was recently described, typically emitted in rapid succession in the form of burst-pulses. We investigated the relationship between buzz and burst-pulse signals and both surface behaviour (foraging, ‘interacting with the kayak’ and socializing) and group size, using a multivariable regression on the signal occurrence and signal count data. Signal occurrence and counts were not related to group size in the regression analysis. Burst-pulses were strongly linked to socializing behaviour, occurring more often and more frequently during socializing and much less during foraging. Buzz vocalizations were not strongly linked to a specific behaviour although there was some evidence of an increase in production during foraging and socializing. In addition, individual level production rates of buzzes during foraging and socializing, and burst-pulses during socializing decreased with increasing group size. Temporally patterned burst-pulse signals were also identified, often occurring within a series of burst-pulses and were directly linked to specific events such as aerial leaping, backflipping, tail slapping and potential mating. Our findings suggest Heaviside's dolphins have a more complex communication system based on pulsed vocalizations than previously understood, perhaps driven by the need to facilitate the social interactions of this species. |
en_ZA |
dc.description.department |
Mammal Research Institute |
en_ZA |
dc.description.department |
Zoology and Entomology |
en_ZA |
dc.description.embargo |
2020-04-01 |
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dc.description.librarian |
hj2019 |
en_ZA |
dc.description.sponsorship |
This research was supported by a Fulbright U.S.A. Research Fellowship, a National Geographic Society Grant in conjunction with the Waitt Foundation (38115) and the University of Pretoria's Zoology Department. In addition, the Claude Leon Foundation and the South African National Research Foundation provided salary support for T.G. and S.H.E. |
en_ZA |
dc.description.uri |
http://www.elsevier.com/locate/anbehav |
en_ZA |
dc.identifier.citation |
Martin, M.J., Elwen, S.H., Kassanjee, R. et al. 2019, 'To buzz or burst-pulse? The functional role of Heaviside's dolphin, Cephalorhynchus heavisidii, rapidly pulsed signals', Animal Behaviour, vol. 150, pp. 273-284. |
en_ZA |
dc.identifier.issn |
0003-3472 (print) |
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dc.identifier.issn |
1095-8282 (online) |
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dc.identifier.other |
10.1016/j.anbehav.2019.01.007 |
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dc.identifier.uri |
http://hdl.handle.net/2263/71067 |
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dc.language.iso |
en |
en_ZA |
dc.publisher |
Elsevier |
en_ZA |
dc.rights |
© 2019 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Animal Behaviour. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Animal Behaviour, vol. 150, pp. 273-284, 2019, doi : 10.1016/j.anbehav.2019.01.007. |
en_ZA |
dc.subject |
Narrowband high-frequency (NBHF) |
en_ZA |
dc.subject |
Acoustics |
en_ZA |
dc.subject |
Behaviour |
en_ZA |
dc.subject |
Biosonar |
en_ZA |
dc.subject |
Communication |
en_ZA |
dc.subject |
Echolocation |
en_ZA |
dc.subject |
Fast click series |
en_ZA |
dc.subject |
Foraging |
en_ZA |
dc.subject |
Clicks |
en_ZA |
dc.subject |
Odontocetes |
en_ZA |
dc.subject |
Vocalizations |
en_ZA |
dc.title |
To buzz or burst-pulse? The functional role of Heaviside's dolphin, Cephalorhynchus heavisidii, rapidly pulsed signals |
en_ZA |
dc.type |
Postprint Article |
en_ZA |