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Signal-specific amplitude adjustment to noise in common bottlenose dolphins (Tursiops truncatus)

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Standard

Signal-specific amplitude adjustment to noise in common bottlenose dolphins (Tursiops truncatus). / Kragh, Ida M; McHugh, Katherine; Wells, Randall S et al.

In: The Journal of Experimental Biology, Vol. 222, jeb216606, 03.12.2019.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Harvard

Kragh, IM, McHugh, K, Wells, RS, Sayigh, LS, Janik, VM, Tyack, PL & Jensen, FH 2019, 'Signal-specific amplitude adjustment to noise in common bottlenose dolphins (Tursiops truncatus)', The Journal of Experimental Biology, vol. 222, jeb216606. https://doi.org/10.1242/jeb.216606

APA

Kragh, I. M., McHugh, K., Wells, R. S., Sayigh, L. S., Janik, V. M., Tyack, P. L., & Jensen, F. H. (2019). Signal-specific amplitude adjustment to noise in common bottlenose dolphins (Tursiops truncatus). The Journal of Experimental Biology, 222, [jeb216606]. https://doi.org/10.1242/jeb.216606

CBE

Kragh IM, McHugh K, Wells RS, Sayigh LS, Janik VM, Tyack PL, Jensen FH. 2019. Signal-specific amplitude adjustment to noise in common bottlenose dolphins (Tursiops truncatus). The Journal of Experimental Biology. 222:Article jeb216606. https://doi.org/10.1242/jeb.216606

MLA

Vancouver

Kragh IM, McHugh K, Wells RS, Sayigh LS, Janik VM, Tyack PL et al. Signal-specific amplitude adjustment to noise in common bottlenose dolphins (Tursiops truncatus). The Journal of Experimental Biology. 2019 Dec 3;222:jeb216606. doi: 10.1242/jeb.216606

Author

Kragh, Ida M ; McHugh, Katherine ; Wells, Randall S et al. / Signal-specific amplitude adjustment to noise in common bottlenose dolphins (Tursiops truncatus). In: The Journal of Experimental Biology. 2019 ; Vol. 222.

Bibtex

@article{6d827528ece141a3966e881ecf3cad73,
title = "Signal-specific amplitude adjustment to noise in common bottlenose dolphins (Tursiops truncatus)",
abstract = "Anthropogenic underwater noise has increased over the past century, raising concern about the impact on cetaceans that rely on sound for communication, navigation and locating prey and predators. Many terrestrial animals increase the amplitude of their acoustic signals to partially compensate for the masking effect of noise (the Lombard response), but it has been suggested that cetaceans almost fully compensate with amplitude adjustments for increasing noise levels. Here, we used sound-recording DTAGs on pairs of free-ranging common bottlenose dolphins (Tursiops truncatus) to test (i) whether dolphins increase signal amplitude to compensate for increasing ambient noise and (ii) whether adjustments are identical for different signal types. We present evidence of a Lombard response in the range 0.1-0.3 dB per 1 dB increase in ambient noise, which is similar to that of terrestrial animals, but much lower than the response reported for other cetaceans. We found that signature whistles tended to be louder and with a lower degree of amplitude adjustment to noise compared with non-signature whistles, suggesting that signature whistles may be selected for higher output levels and may have a smaller scope for amplitude adjustment to noise. The consequence of the limited degree of vocal amplitude compensation is a loss of active space during periods of increased noise, with potential consequences for group cohesion, conspecific encounter rates and mate attraction.",
author = "Kragh, {Ida M} and Katherine McHugh and Wells, {Randall S} and Sayigh, {Laela S} and Janik, {Vincent M} and Tyack, {Peter L} and Jensen, {Frants H}",
note = "{\textcopyright} 2019. Published by The Company of Biologists Ltd.",
year = "2019",
month = dec,
day = "3",
doi = "10.1242/jeb.216606",
language = "English",
volume = "222",
journal = "The Journal of Experimental Biology",
issn = "0022-0949",
publisher = "The/Company of Biologists Ltd.",

}

RIS

TY - JOUR

T1 - Signal-specific amplitude adjustment to noise in common bottlenose dolphins (Tursiops truncatus)

AU - Kragh, Ida M

AU - McHugh, Katherine

AU - Wells, Randall S

AU - Sayigh, Laela S

AU - Janik, Vincent M

AU - Tyack, Peter L

AU - Jensen, Frants H

N1 - © 2019. Published by The Company of Biologists Ltd.

PY - 2019/12/3

Y1 - 2019/12/3

N2 - Anthropogenic underwater noise has increased over the past century, raising concern about the impact on cetaceans that rely on sound for communication, navigation and locating prey and predators. Many terrestrial animals increase the amplitude of their acoustic signals to partially compensate for the masking effect of noise (the Lombard response), but it has been suggested that cetaceans almost fully compensate with amplitude adjustments for increasing noise levels. Here, we used sound-recording DTAGs on pairs of free-ranging common bottlenose dolphins (Tursiops truncatus) to test (i) whether dolphins increase signal amplitude to compensate for increasing ambient noise and (ii) whether adjustments are identical for different signal types. We present evidence of a Lombard response in the range 0.1-0.3 dB per 1 dB increase in ambient noise, which is similar to that of terrestrial animals, but much lower than the response reported for other cetaceans. We found that signature whistles tended to be louder and with a lower degree of amplitude adjustment to noise compared with non-signature whistles, suggesting that signature whistles may be selected for higher output levels and may have a smaller scope for amplitude adjustment to noise. The consequence of the limited degree of vocal amplitude compensation is a loss of active space during periods of increased noise, with potential consequences for group cohesion, conspecific encounter rates and mate attraction.

AB - Anthropogenic underwater noise has increased over the past century, raising concern about the impact on cetaceans that rely on sound for communication, navigation and locating prey and predators. Many terrestrial animals increase the amplitude of their acoustic signals to partially compensate for the masking effect of noise (the Lombard response), but it has been suggested that cetaceans almost fully compensate with amplitude adjustments for increasing noise levels. Here, we used sound-recording DTAGs on pairs of free-ranging common bottlenose dolphins (Tursiops truncatus) to test (i) whether dolphins increase signal amplitude to compensate for increasing ambient noise and (ii) whether adjustments are identical for different signal types. We present evidence of a Lombard response in the range 0.1-0.3 dB per 1 dB increase in ambient noise, which is similar to that of terrestrial animals, but much lower than the response reported for other cetaceans. We found that signature whistles tended to be louder and with a lower degree of amplitude adjustment to noise compared with non-signature whistles, suggesting that signature whistles may be selected for higher output levels and may have a smaller scope for amplitude adjustment to noise. The consequence of the limited degree of vocal amplitude compensation is a loss of active space during periods of increased noise, with potential consequences for group cohesion, conspecific encounter rates and mate attraction.

U2 - 10.1242/jeb.216606

DO - 10.1242/jeb.216606

M3 - Journal article

C2 - 31704900

VL - 222

JO - The Journal of Experimental Biology

JF - The Journal of Experimental Biology

SN - 0022-0949

M1 - jeb216606

ER -