Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion
Toothed whales have evolved flexible biosonar systems to find, track and capture prey in diverse habitats. Delphinids, phocoenids and iniids adjust inter-click intervals and source levels gradually while approaching prey. In contrast, deep-diving beaked and sperm whales maintain relatively constant...
Published in: | Journal of Experimental Biology |
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2020
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/dynamic-biosonar-adjustment-strategies-in-deepdiving-rissos-dolphins-driven-partly-by-prey-evasion(a9e4d350-2d1a-4d81-aa3b-fb5eddb3e468).html https://doi.org/10.1242/jeb.216283 https://research-repository.st-andrews.ac.uk/bitstream/10023/21359/1/Jensen_2020_Dynamic_biosonar_adjustment_jeb216283.pdf https://jeb.biologists.org/content/223/3/jeb216283.supplemental |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/a9e4d350-2d1a-4d81-aa3b-fb5eddb3e468 2023-05-15T18:33:30+02:00 Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion Jensen, Frants H. Keller, Onno A. Tyack, Peter L. Visser, Fleur 2020-02 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/dynamic-biosonar-adjustment-strategies-in-deepdiving-rissos-dolphins-driven-partly-by-prey-evasion(a9e4d350-2d1a-4d81-aa3b-fb5eddb3e468).html https://doi.org/10.1242/jeb.216283 https://research-repository.st-andrews.ac.uk/bitstream/10023/21359/1/Jensen_2020_Dynamic_biosonar_adjustment_jeb216283.pdf https://jeb.biologists.org/content/223/3/jeb216283.supplemental eng eng info:eu-repo/semantics/openAccess Jensen , F H , Keller , O A , Tyack , P L & Visser , F 2020 , ' Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion ' , Journal of Experimental Biology , vol. 223 , jeb216283 . https://doi.org/10.1242/jeb.216283 Echolacation Sensory ecology Mesopelagic foraging Deep-water environment Biosonar strategies Gain control article 2020 ftunstandrewcris https://doi.org/10.1242/jeb.216283 2022-10-13T15:26:31Z Toothed whales have evolved flexible biosonar systems to find, track and capture prey in diverse habitats. Delphinids, phocoenids and iniids adjust inter-click intervals and source levels gradually while approaching prey. In contrast, deep-diving beaked and sperm whales maintain relatively constant inter-click intervals and apparent output levels during the approach followed by a rapid transition into the foraging buzz, presumably to maintain a long-range acoustic scene in a multi-target environment. However, it remains unknown whether this rapid biosonar adjustment strategy is shared by delphinids foraging in deep waters. To test this, we investigated biosonar adjustments of a deep-diving delphinid, the Risso's dolphin ( Grampus griseus ). We analyzed inter-click interval and apparent output level adjustments recorded from sound recording tags to quantify in situ sensory adjustment during prey capture attempts. Risso's dolphins did not follow typical (20log R ) biosonar adjustment patterns seen in shallow-water species, but instead maintained stable repetition rates and output levels up to the foraging buzz. Our results suggest that maintaining a long-range acoustic scene to exploit complex, multi-target prey layers is a common strategy amongst deep-diving toothed whales. Risso's dolphins transitioned rapidly into the foraging buzz just like beaked whales during most foraging attempts, but employed a more gradual biosonar adjustment in a subset (19%) of prey approaches. These were characterized by higher speeds and minimum specific acceleration, indicating higher prey capture efforts associated with evasive prey. Thus, tracking and capturing evasive prey using biosonar may require a more gradual switch between multi-target echolocation and single-target tracking. Article in Journal/Newspaper toothed whales University of St Andrews: Research Portal Journal of Experimental Biology |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
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ftunstandrewcris |
language |
English |
topic |
Echolacation Sensory ecology Mesopelagic foraging Deep-water environment Biosonar strategies Gain control |
spellingShingle |
Echolacation Sensory ecology Mesopelagic foraging Deep-water environment Biosonar strategies Gain control Jensen, Frants H. Keller, Onno A. Tyack, Peter L. Visser, Fleur Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
topic_facet |
Echolacation Sensory ecology Mesopelagic foraging Deep-water environment Biosonar strategies Gain control |
description |
Toothed whales have evolved flexible biosonar systems to find, track and capture prey in diverse habitats. Delphinids, phocoenids and iniids adjust inter-click intervals and source levels gradually while approaching prey. In contrast, deep-diving beaked and sperm whales maintain relatively constant inter-click intervals and apparent output levels during the approach followed by a rapid transition into the foraging buzz, presumably to maintain a long-range acoustic scene in a multi-target environment. However, it remains unknown whether this rapid biosonar adjustment strategy is shared by delphinids foraging in deep waters. To test this, we investigated biosonar adjustments of a deep-diving delphinid, the Risso's dolphin ( Grampus griseus ). We analyzed inter-click interval and apparent output level adjustments recorded from sound recording tags to quantify in situ sensory adjustment during prey capture attempts. Risso's dolphins did not follow typical (20log R ) biosonar adjustment patterns seen in shallow-water species, but instead maintained stable repetition rates and output levels up to the foraging buzz. Our results suggest that maintaining a long-range acoustic scene to exploit complex, multi-target prey layers is a common strategy amongst deep-diving toothed whales. Risso's dolphins transitioned rapidly into the foraging buzz just like beaked whales during most foraging attempts, but employed a more gradual biosonar adjustment in a subset (19%) of prey approaches. These were characterized by higher speeds and minimum specific acceleration, indicating higher prey capture efforts associated with evasive prey. Thus, tracking and capturing evasive prey using biosonar may require a more gradual switch between multi-target echolocation and single-target tracking. |
format |
Article in Journal/Newspaper |
author |
Jensen, Frants H. Keller, Onno A. Tyack, Peter L. Visser, Fleur |
author_facet |
Jensen, Frants H. Keller, Onno A. Tyack, Peter L. Visser, Fleur |
author_sort |
Jensen, Frants H. |
title |
Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
title_short |
Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
title_full |
Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
title_fullStr |
Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
title_full_unstemmed |
Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
title_sort |
dynamic biosonar adjustment strategies in deep-diving risso's dolphins driven partly by prey evasion |
publishDate |
2020 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/dynamic-biosonar-adjustment-strategies-in-deepdiving-rissos-dolphins-driven-partly-by-prey-evasion(a9e4d350-2d1a-4d81-aa3b-fb5eddb3e468).html https://doi.org/10.1242/jeb.216283 https://research-repository.st-andrews.ac.uk/bitstream/10023/21359/1/Jensen_2020_Dynamic_biosonar_adjustment_jeb216283.pdf https://jeb.biologists.org/content/223/3/jeb216283.supplemental |
genre |
toothed whales |
genre_facet |
toothed whales |
op_source |
Jensen , F H , Keller , O A , Tyack , P L & Visser , F 2020 , ' Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion ' , Journal of Experimental Biology , vol. 223 , jeb216283 . https://doi.org/10.1242/jeb.216283 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1242/jeb.216283 |
container_title |
Journal of Experimental Biology |
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1766218108359409664 |