Supplementary material from "Heaviside's dolphins ( Cephalorhynchus heavisidii ) relax acoustic crypsis to increase communication range"
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-freque...
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ftdatacite:10.6084/m9.figshare.c.4154456.v1 2023-05-15T18:33:32+02:00 Supplementary material from "Heaviside's dolphins ( Cephalorhynchus heavisidii ) relax acoustic crypsis to increase communication range" Martin, Morgan J. Gridley, Tess Elwen, Simon H. Jensen, Frants H. 2018 https://dx.doi.org/10.6084/m9.figshare.c.4154456.v1 https://figshare.com/collections/Supplementary_material_from_Heaviside_s_dolphins_i_Cephalorhynchus_heavisidii_i_relax_acoustic_crypsis_to_increase_communication_range_/4154456/1 unknown Figshare https://dx.doi.org/10.1098/rspb.2018.1178 https://dx.doi.org/10.6084/m9.figshare.c.4154456 CC BY 4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Evolutionary Biology FOS Biological sciences Ecology 60801 Animal Behaviour Collection article 2018 ftdatacite https://doi.org/10.6084/m9.figshare.c.4154456.v1 https://doi.org/10.1098/rspb.2018.1178 https://doi.org/10.6084/m9.figshare.c.4154456 2021-11-05T12:55:41Z 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 but not foraging buzzes. We evaluate three different hypotheses and conclude that the most likely benefit of these clicks is to decrease transmission directivity and increase conspecific communication range. The expected increase in active space depends on background noise but ranges from 2.5 (Wenz Sea State 6) to 5 times (Wenz Sea State 1) the active space of NBHF signals. This dual click strategy, therefore, allows these social dolphins to maintain acoustic crypsis during navigation and foraging, and to selectively relax their crypsis to facilitate communication with conspecifics. Article in Journal/Newspaper toothed whales DataCite Metadata Store (German National Library of Science and Technology) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
Evolutionary Biology FOS Biological sciences Ecology 60801 Animal Behaviour |
spellingShingle |
Evolutionary Biology FOS Biological sciences Ecology 60801 Animal Behaviour Martin, Morgan J. Gridley, Tess Elwen, Simon H. Jensen, Frants H. Supplementary material from "Heaviside's dolphins ( Cephalorhynchus heavisidii ) relax acoustic crypsis to increase communication range" |
topic_facet |
Evolutionary Biology FOS Biological sciences Ecology 60801 Animal Behaviour |
description |
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 but not foraging buzzes. We evaluate three different hypotheses and conclude that the most likely benefit of these clicks is to decrease transmission directivity and increase conspecific communication range. The expected increase in active space depends on background noise but ranges from 2.5 (Wenz Sea State 6) to 5 times (Wenz Sea State 1) the active space of NBHF signals. This dual click strategy, therefore, allows these social dolphins to maintain acoustic crypsis during navigation and foraging, and to selectively relax their crypsis to facilitate communication with conspecifics. |
format |
Article in Journal/Newspaper |
author |
Martin, Morgan J. Gridley, Tess Elwen, Simon H. Jensen, Frants H. |
author_facet |
Martin, Morgan J. Gridley, Tess Elwen, Simon H. Jensen, Frants H. |
author_sort |
Martin, Morgan J. |
title |
Supplementary material from "Heaviside's dolphins ( Cephalorhynchus heavisidii ) relax acoustic crypsis to increase communication range" |
title_short |
Supplementary material from "Heaviside's dolphins ( Cephalorhynchus heavisidii ) relax acoustic crypsis to increase communication range" |
title_full |
Supplementary material from "Heaviside's dolphins ( Cephalorhynchus heavisidii ) relax acoustic crypsis to increase communication range" |
title_fullStr |
Supplementary material from "Heaviside's dolphins ( Cephalorhynchus heavisidii ) relax acoustic crypsis to increase communication range" |
title_full_unstemmed |
Supplementary material from "Heaviside's dolphins ( Cephalorhynchus heavisidii ) relax acoustic crypsis to increase communication range" |
title_sort |
supplementary material from "heaviside's dolphins ( cephalorhynchus heavisidii ) relax acoustic crypsis to increase communication range" |
publisher |
Figshare |
publishDate |
2018 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.4154456.v1 https://figshare.com/collections/Supplementary_material_from_Heaviside_s_dolphins_i_Cephalorhynchus_heavisidii_i_relax_acoustic_crypsis_to_increase_communication_range_/4154456/1 |
genre |
toothed whales |
genre_facet |
toothed whales |
op_relation |
https://dx.doi.org/10.1098/rspb.2018.1178 https://dx.doi.org/10.6084/m9.figshare.c.4154456 |
op_rights |
CC BY 4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.4154456.v1 https://doi.org/10.1098/rspb.2018.1178 https://doi.org/10.6084/m9.figshare.c.4154456 |
_version_ |
1766218153150382080 |