Amazon river dolphins (Inia geoffrensis) use a high-frequency short-range biosonar
Author Posting. © The Company of Biologists, 2015. This article is posted here by permission of The Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology 218 (2015): 3091-3101, doi:10.1242/jeb.120501. Toothed whales pr...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/7584 2023-05-15T18:33:24+02:00 Amazon river dolphins (Inia geoffrensis) use a high-frequency short-range biosonar Ladegaard, Michael Jensen, Frants H. de Freitas, Mafalda da Silva, Vera Maria F. Madsen, Peter T. 2015-10-07 application/pdf https://hdl.handle.net/1912/7584 en eng The Company of Biologists https://doi.org/10.1242/jeb.120501 Journal of Experimental Biology 218 (2015): 3091-3101 https://hdl.handle.net/1912/7584 doi:10.1242/jeb.120501 Journal of Experimental Biology 218 (2015): 3091-3101 doi:10.1242/jeb.120501 Beamwidth Clutter Directionality Echolocation Habitat Toothed whale Article 2015 ftwhoas https://doi.org/10.1242/jeb.120501 2022-05-28T22:59:25Z Author Posting. © The Company of Biologists, 2015. This article is posted here by permission of The Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology 218 (2015): 3091-3101, doi:10.1242/jeb.120501. 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 µPa, mean SLEFD of 132.1±6.0 dB re. 1 µPa2s, mean Fc 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. Field work was funded by Danish National Research Council grants to P.T.M., Associação Amigos do Peixe Boi da Amazônia (AMPA) and Petrobras ... Article in Journal/Newspaper toothed whale toothed whales Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Journal of Experimental Biology 218 19 3091 3101 |
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Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Beamwidth Clutter Directionality Echolocation Habitat Toothed whale |
spellingShingle |
Beamwidth Clutter Directionality Echolocation Habitat Toothed whale Ladegaard, Michael Jensen, Frants H. de Freitas, Mafalda da Silva, Vera Maria F. Madsen, Peter T. Amazon river dolphins (Inia geoffrensis) use a high-frequency short-range biosonar |
topic_facet |
Beamwidth Clutter Directionality Echolocation Habitat Toothed whale |
description |
Author Posting. © The Company of Biologists, 2015. This article is posted here by permission of The Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology 218 (2015): 3091-3101, doi:10.1242/jeb.120501. 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 µPa, mean SLEFD of 132.1±6.0 dB re. 1 µPa2s, mean Fc 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. Field work was funded by Danish National Research Council grants to P.T.M., Associação Amigos do Peixe Boi da Amazônia (AMPA) and Petrobras ... |
format |
Article in Journal/Newspaper |
author |
Ladegaard, Michael Jensen, Frants H. de Freitas, Mafalda da Silva, Vera Maria F. Madsen, Peter T. |
author_facet |
Ladegaard, Michael Jensen, Frants H. de Freitas, Mafalda da Silva, Vera Maria F. Madsen, Peter T. |
author_sort |
Ladegaard, Michael |
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 |
The Company of Biologists |
publishDate |
2015 |
url |
https://hdl.handle.net/1912/7584 |
genre |
toothed whale toothed whales |
genre_facet |
toothed whale toothed whales |
op_source |
Journal of Experimental Biology 218 (2015): 3091-3101 doi:10.1242/jeb.120501 |
op_relation |
https://doi.org/10.1242/jeb.120501 Journal of Experimental Biology 218 (2015): 3091-3101 https://hdl.handle.net/1912/7584 doi:10.1242/jeb.120501 |
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 |
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1766218007169728512 |