Amazon river dolphins (Inia geoffrensis) use a high-frequency short-range biosonar
Toothed whales produce echolocation clicks with source parameters related to body size; however, it may be equally important to consider the influence of habitat, as suggested by studies on echolocating bats. A few toothed whale species have fully adapted to river systems, where sonar operation is l...
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Online Access: | https://doi.org/10.1242/jeb.120501 https://researchportal.murdoch.edu.au/esploro/outputs/journalArticle/Amazon-river-dolphins-Inia-geoffrensis-use/991005542522207891 https://researchportal.murdoch.edu.au/view/delivery/61MUN_INST/12135792700007891/13136728640007891 |
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ftmurdochunivall:oai:alma.61MUN_INST:11135792710007891 2024-09-15T18:39:10+00:00 Amazon river dolphins (Inia geoffrensis) use a high-frequency short-range biosonar Ladegaard, M. Jensen, F.H. de Freitas, M. Ferreira da Silva, V.M. Madsen, P.T. 2015 pdf https://doi.org/10.1242/jeb.120501 https://researchportal.murdoch.edu.au/esploro/outputs/journalArticle/Amazon-river-dolphins-Inia-geoffrensis-use/991005542522207891 https://researchportal.murdoch.edu.au/view/delivery/61MUN_INST/12135792700007891/13136728640007891 eng eng Company of Biologists ispartof: Journal of Experimental Biology spage 3091 epage 3101 issue 19 vol 218 doi:10.1242/jeb.120501 WOS:000363450300021 0022-0949 http://dx.doi.org/10.1242/jeb.120501 991005542522207891 https://researchportal.murdoch.edu.au/esploro/outputs/journalArticle/Amazon-river-dolphins-Inia-geoffrensis-use/991005542522207891 https://researchportal.murdoch.edu.au/view/delivery/61MUN_INST/12135792700007891/13136728640007891 alma:61MUN_INST/bibs/991005542522207891 © 2015. Published by The Company of Biologists Ltd Open text Article 2015 ftmurdochunivall https://doi.org/10.1242/jeb.120501 2024-08-15T00:52:51Z Toothed whales produce echolocation clicks with source parameters related to body size; however, it may be equally important to consider the influence of habitat, as suggested by studies on echolocating bats. A few toothed whale species have fully adapted to river systems, where sonar operation is likely to result in higher clutter and reverberation levels than those experienced by most toothed whales at sea because of the shallow water and dense vegetation. To test the hypothesis that habitat shapes the evolution of toothed whale biosonar parameters by promoting simpler auditory scenes to interpret in acoustically complex habitats, echolocation clicks of wild Amazon river dolphins were recorded using a vertical seven-hydrophone array. We identified 404 on-axis biosonar clicks having a mean SLpp of 190.3 +/- 6.1 dB re. 1 mu Pa, mean SLEFD of 132.1 +/- 6.0 dB re. 1 mu Pa(2)s, mean F-c of 101.2 +/- 10.5 kHz, mean BWRMS of 29.3 +/- 4.3 kHz and mean ICI of 35.1 +/- 17.9 ms. Piston fit modelling resulted in an estimated half-power beamwidth of 10.2 deg (95% CI: 9.6-10.5 deg) and directivity index of 25.2 dB (95% CI: 24.9-25.7 dB). These results support the hypothesis that river-dwelling toothed whales operate their biosonars at lower amplitude and higher sampling rates than similar-sized marine species without sacrificing high directivity, in order to provide high update rates in acoustically complex habitats and simplify auditory scenes through reduced clutter and reverberation levels. We conclude that habitat, along with body size, is an important evolutionary driver of source parameters in toothed whale biosonars. Article in Journal/Newspaper toothed whale toothed whales Murdoch University Research Portal Journal of Experimental Biology 218 19 3091 3101 |
institution |
Open Polar |
collection |
Murdoch University Research Portal |
op_collection_id |
ftmurdochunivall |
language |
English |
description |
Toothed whales produce echolocation clicks with source parameters related to body size; however, it may be equally important to consider the influence of habitat, as suggested by studies on echolocating bats. A few toothed whale species have fully adapted to river systems, where sonar operation is likely to result in higher clutter and reverberation levels than those experienced by most toothed whales at sea because of the shallow water and dense vegetation. To test the hypothesis that habitat shapes the evolution of toothed whale biosonar parameters by promoting simpler auditory scenes to interpret in acoustically complex habitats, echolocation clicks of wild Amazon river dolphins were recorded using a vertical seven-hydrophone array. We identified 404 on-axis biosonar clicks having a mean SLpp of 190.3 +/- 6.1 dB re. 1 mu Pa, mean SLEFD of 132.1 +/- 6.0 dB re. 1 mu Pa(2)s, mean F-c of 101.2 +/- 10.5 kHz, mean BWRMS of 29.3 +/- 4.3 kHz and mean ICI of 35.1 +/- 17.9 ms. Piston fit modelling resulted in an estimated half-power beamwidth of 10.2 deg (95% CI: 9.6-10.5 deg) and directivity index of 25.2 dB (95% CI: 24.9-25.7 dB). These results support the hypothesis that river-dwelling toothed whales operate their biosonars at lower amplitude and higher sampling rates than similar-sized marine species without sacrificing high directivity, in order to provide high update rates in acoustically complex habitats and simplify auditory scenes through reduced clutter and reverberation levels. We conclude that habitat, along with body size, is an important evolutionary driver of source parameters in toothed whale biosonars. |
format |
Article in Journal/Newspaper |
author |
Ladegaard, M. Jensen, F.H. de Freitas, M. Ferreira da Silva, V.M. Madsen, P.T. |
spellingShingle |
Ladegaard, M. Jensen, F.H. de Freitas, M. Ferreira da Silva, V.M. Madsen, P.T. Amazon river dolphins (Inia geoffrensis) use a high-frequency short-range biosonar |
author_facet |
Ladegaard, M. Jensen, F.H. de Freitas, M. Ferreira da Silva, V.M. Madsen, P.T. |
author_sort |
Ladegaard, M. |
title |
Amazon river dolphins (Inia geoffrensis) use a high-frequency short-range biosonar |
title_short |
Amazon river dolphins (Inia geoffrensis) use a high-frequency short-range biosonar |
title_full |
Amazon river dolphins (Inia geoffrensis) use a high-frequency short-range biosonar |
title_fullStr |
Amazon river dolphins (Inia geoffrensis) use a high-frequency short-range biosonar |
title_full_unstemmed |
Amazon river dolphins (Inia geoffrensis) use a high-frequency short-range biosonar |
title_sort |
amazon river dolphins (inia geoffrensis) use a high-frequency short-range biosonar |
publisher |
Company of Biologists |
publishDate |
2015 |
url |
https://doi.org/10.1242/jeb.120501 https://researchportal.murdoch.edu.au/esploro/outputs/journalArticle/Amazon-river-dolphins-Inia-geoffrensis-use/991005542522207891 https://researchportal.murdoch.edu.au/view/delivery/61MUN_INST/12135792700007891/13136728640007891 |
genre |
toothed whale toothed whales |
genre_facet |
toothed whale toothed whales |
op_relation |
ispartof: Journal of Experimental Biology spage 3091 epage 3101 issue 19 vol 218 doi:10.1242/jeb.120501 WOS:000363450300021 0022-0949 http://dx.doi.org/10.1242/jeb.120501 991005542522207891 https://researchportal.murdoch.edu.au/esploro/outputs/journalArticle/Amazon-river-dolphins-Inia-geoffrensis-use/991005542522207891 https://researchportal.murdoch.edu.au/view/delivery/61MUN_INST/12135792700007891/13136728640007891 alma:61MUN_INST/bibs/991005542522207891 |
op_rights |
© 2015. Published by The Company of Biologists Ltd Open |
op_doi |
https://doi.org/10.1242/jeb.120501 |
container_title |
Journal of Experimental Biology |
container_volume |
218 |
container_issue |
19 |
container_start_page |
3091 |
op_container_end_page |
3101 |
_version_ |
1810483571063783424 |