Risso's dolphins perform spin dives to target deep-dwelling prey

Foraging decisions of deep-diving cetaceans can provide fundamental insight into food web dynamics of the deep pelagic ocean. Cetacean optimal foraging entails a tight balance between oxygen-conserving dive strategies and access to deep-dwelling prey of sufficient energetic reward. Risso's dolp...

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Autores principales:	Fleur Visser, Onno A. Keller, Machiel G. Oudejans, Douglas P. Nowacek, Annebelle C. M. Kok, Jef Huisman, Elisabeth H. M. Sterck
Formato:	article
Lenguaje:	EN
Publicado:	The Royal Society 2021
Materias:	deep-sea food web scattering layer deep-diving optimal foraging animal decision-making Grampus griseus Science Q
Acceso en línea:	https://doaj.org/article/9c385ad5e8054055bbbde62224dd6bec
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spelling	oai:doaj.org-article:9c385ad5e8054055bbbde62224dd6bec2021-12-01T08:05:33ZRisso's dolphins perform spin dives to target deep-dwelling prey10.1098/rsos.2023202054-5703https://doaj.org/article/9c385ad5e8054055bbbde62224dd6bec2021-12-01T00:00:00Zhttps://royalsocietypublishing.org/doi/10.1098/rsos.202320https://doaj.org/toc/2054-5703Foraging decisions of deep-diving cetaceans can provide fundamental insight into food web dynamics of the deep pelagic ocean. Cetacean optimal foraging entails a tight balance between oxygen-conserving dive strategies and access to deep-dwelling prey of sufficient energetic reward. Risso's dolphins (Grampus griseus) displayed a thus far unknown dive strategy, which we termed the spin dive. Dives started with intense stroking and right-sided lateral rotation. This remarkable behaviour resulted in a rapid descent. By tracking the fine-scale foraging behaviour of seven tagged individuals, matched with prey layer recordings, we tested the hypothesis that spin dives are foraging dives targeting deep-dwelling prey. Hunting depth traced the diel movement of the deep scattering layer, a dense aggregation of prey, that resides deep during the day and near-surface at night. Individuals shifted their foraging strategy from deep spin dives to shallow non-spin dives around dusk. Spin dives were significantly faster, steeper and deeper than non-spin dives, effectively minimizing transit time to bountiful mesopelagic prey, and were focused on periods when the migratory prey might be easier to catch. Hence, whereas Risso's dolphins were mostly shallow, nocturnal foragers, their spin dives enabled extended and rewarding diurnal foraging on deep-dwelling prey.Fleur VisserOnno A. KellerMachiel G. OudejansDouglas P. NowacekAnnebelle C. M. KokJef HuismanElisabeth H. M. SterckThe Royal Societyarticledeep-sea food webscattering layerdeep-divingoptimal foraginganimal decision-makingGrampus griseusScienceQENRoyal Society Open Science, Vol 8, Iss 12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	deep-sea food web scattering layer deep-diving optimal foraging animal decision-making Grampus griseus Science Q
spellingShingle	deep-sea food web scattering layer deep-diving optimal foraging animal decision-making Grampus griseus Science Q Fleur Visser Onno A. Keller Machiel G. Oudejans Douglas P. Nowacek Annebelle C. M. Kok Jef Huisman Elisabeth H. M. Sterck Risso's dolphins perform spin dives to target deep-dwelling prey
description	Foraging decisions of deep-diving cetaceans can provide fundamental insight into food web dynamics of the deep pelagic ocean. Cetacean optimal foraging entails a tight balance between oxygen-conserving dive strategies and access to deep-dwelling prey of sufficient energetic reward. Risso's dolphins (Grampus griseus) displayed a thus far unknown dive strategy, which we termed the spin dive. Dives started with intense stroking and right-sided lateral rotation. This remarkable behaviour resulted in a rapid descent. By tracking the fine-scale foraging behaviour of seven tagged individuals, matched with prey layer recordings, we tested the hypothesis that spin dives are foraging dives targeting deep-dwelling prey. Hunting depth traced the diel movement of the deep scattering layer, a dense aggregation of prey, that resides deep during the day and near-surface at night. Individuals shifted their foraging strategy from deep spin dives to shallow non-spin dives around dusk. Spin dives were significantly faster, steeper and deeper than non-spin dives, effectively minimizing transit time to bountiful mesopelagic prey, and were focused on periods when the migratory prey might be easier to catch. Hence, whereas Risso's dolphins were mostly shallow, nocturnal foragers, their spin dives enabled extended and rewarding diurnal foraging on deep-dwelling prey.
format	article
author	Fleur Visser Onno A. Keller Machiel G. Oudejans Douglas P. Nowacek Annebelle C. M. Kok Jef Huisman Elisabeth H. M. Sterck
author_facet	Fleur Visser Onno A. Keller Machiel G. Oudejans Douglas P. Nowacek Annebelle C. M. Kok Jef Huisman Elisabeth H. M. Sterck
author_sort	Fleur Visser
title	Risso's dolphins perform spin dives to target deep-dwelling prey
title_short	Risso's dolphins perform spin dives to target deep-dwelling prey
title_full	Risso's dolphins perform spin dives to target deep-dwelling prey
title_fullStr	Risso's dolphins perform spin dives to target deep-dwelling prey
title_full_unstemmed	Risso's dolphins perform spin dives to target deep-dwelling prey
title_sort	risso's dolphins perform spin dives to target deep-dwelling prey
publisher	The Royal Society
publishDate	2021
url	https://doaj.org/article/9c385ad5e8054055bbbde62224dd6bec
work_keys_str_mv	AT fleurvisser rissosdolphinsperformspindivestotargetdeepdwellingprey AT onnoakeller rissosdolphinsperformspindivestotargetdeepdwellingprey AT machielgoudejans rissosdolphinsperformspindivestotargetdeepdwellingprey AT douglaspnowacek rissosdolphinsperformspindivestotargetdeepdwellingprey AT annebellecmkok rissosdolphinsperformspindivestotargetdeepdwellingprey AT jefhuisman rissosdolphinsperformspindivestotargetdeepdwellingprey AT elisabethhmsterck rissosdolphinsperformspindivestotargetdeepdwellingprey
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Risso's dolphins perform spin dives to target deep-dwelling prey

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