High diving metabolic rate indicated by high-speed transit to depth in negatively buoyant long-finned pilot whales

To maximize foraging duration at depth, diving mammals are expected to use the lowest cost optimal speed during descent and ascent transit and to minimize the cost of transport by achieving neutral buoyancy. Here, we outfitted 18 deep-diving long-finned pilot whales with multi-sensor data loggers an...

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Published in:Journal of Experimental Biology
Main Authors: Aoki, Kagari, Sato, Katsufumi, Isojunno, Saana, Narazaki, Tomoko, Miller, Patrick J.O.
Format: Article in Journal/Newspaper
Language:English
Published: 2017
Subjects:
Online Access:https://research-portal.st-andrews.ac.uk/en/researchoutput/high-diving-metabolic-rate-indicated-by-highspeed-transit-to-depth-in-negatively-buoyant-longfinned-pilot-whales(fcea903a-5609-43d4-b6f4-bc094b5c8425).html
https://doi.org/10.1242/jeb.158287
https://research-repository.st-andrews.ac.uk/bitstream/10023/16272/1/Miller_2017_JEB_HighDiving_VoR.pdf
id ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/fcea903a-5609-43d4-b6f4-bc094b5c8425
record_format openpolar
spelling ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/fcea903a-5609-43d4-b6f4-bc094b5c8425 2024-06-23T07:57:12+00:00 High diving metabolic rate indicated by high-speed transit to depth in negatively buoyant long-finned pilot whales Aoki, Kagari Sato, Katsufumi Isojunno, Saana Narazaki, Tomoko Miller, Patrick J.O. 2017-10-18 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/high-diving-metabolic-rate-indicated-by-highspeed-transit-to-depth-in-negatively-buoyant-longfinned-pilot-whales(fcea903a-5609-43d4-b6f4-bc094b5c8425).html https://doi.org/10.1242/jeb.158287 https://research-repository.st-andrews.ac.uk/bitstream/10023/16272/1/Miller_2017_JEB_HighDiving_VoR.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/high-diving-metabolic-rate-indicated-by-highspeed-transit-to-depth-in-negatively-buoyant-longfinned-pilot-whales(fcea903a-5609-43d4-b6f4-bc094b5c8425).html info:eu-repo/semantics/openAccess Aoki , K , Sato , K , Isojunno , S , Narazaki , T & Miller , P J O 2017 , ' High diving metabolic rate indicated by high-speed transit to depth in negatively buoyant long-finned pilot whales ' , Journal of Experimental Biology , vol. 220 , no. 20 , pp. 3802-3811 . https://doi.org/10.1242/jeb.158287 Body condition Cetacean Deep-diving marine mammals Foraging strategy Globicephala melas Swimming kinematics article 2017 ftunstandrewcris https://doi.org/10.1242/jeb.158287 2024-06-13T00:57:52Z To maximize foraging duration at depth, diving mammals are expected to use the lowest cost optimal speed during descent and ascent transit and to minimize the cost of transport by achieving neutral buoyancy. Here, we outfitted 18 deep-diving long-finned pilot whales with multi-sensor data loggers and found indications that their diving strategy is associated with higher costs than those of other deep-diving toothed whales. Theoretical models predict that optimal speed is proportional to (basal metabolic rate/drag)1/3 and therefore to body mass0.05. The transit speed of tagged animals (2.7±0.3 m s−1) was substantially higher than the optimal speed predicted from body mass (1.4–1.7 m s−1). According to the theoretical models, this choice of high transit speed, given a similar drag coefficient (median, 0.0035) to that in other cetaceans, indicated greater basal metabolic costs during diving than for other cetaceans. This could explain the comparatively short duration (8.9±1.5 min) of their deep dives (maximum depth, 444±85 m). Hydrodynamic gliding models indicated negative buoyancy of tissue body density (1038.8± 1.6 kg m–3, ±95% credible interval, CI) and similar diving gas volume (34.6±0.6 ml kg−1, ±95% CI) to those in other deep-diving toothed whales. High diving metabolic rate and costly negative buoyancy imply a ‘spend more, gain more’ strategy of long-finned pilot whales, differing from that in other deep-diving toothed whales, which limits the costs of locomotion during foraging. We also found that net buoyancy affected the optimal speed: high transit speeds gradually decreased during ascent as the whales approached neutral buoyancy owing to gas expansion. Article in Journal/Newspaper toothed whales University of St Andrews: Research Portal Journal of Experimental Biology 220 20 3802 3811
institution Open Polar
collection University of St Andrews: Research Portal
op_collection_id ftunstandrewcris
language English
topic Body condition
Cetacean
Deep-diving marine mammals
Foraging strategy
Globicephala melas
Swimming kinematics
spellingShingle Body condition
Cetacean
Deep-diving marine mammals
Foraging strategy
Globicephala melas
Swimming kinematics
Aoki, Kagari
Sato, Katsufumi
Isojunno, Saana
Narazaki, Tomoko
Miller, Patrick J.O.
High diving metabolic rate indicated by high-speed transit to depth in negatively buoyant long-finned pilot whales
topic_facet Body condition
Cetacean
Deep-diving marine mammals
Foraging strategy
Globicephala melas
Swimming kinematics
description To maximize foraging duration at depth, diving mammals are expected to use the lowest cost optimal speed during descent and ascent transit and to minimize the cost of transport by achieving neutral buoyancy. Here, we outfitted 18 deep-diving long-finned pilot whales with multi-sensor data loggers and found indications that their diving strategy is associated with higher costs than those of other deep-diving toothed whales. Theoretical models predict that optimal speed is proportional to (basal metabolic rate/drag)1/3 and therefore to body mass0.05. The transit speed of tagged animals (2.7±0.3 m s−1) was substantially higher than the optimal speed predicted from body mass (1.4–1.7 m s−1). According to the theoretical models, this choice of high transit speed, given a similar drag coefficient (median, 0.0035) to that in other cetaceans, indicated greater basal metabolic costs during diving than for other cetaceans. This could explain the comparatively short duration (8.9±1.5 min) of their deep dives (maximum depth, 444±85 m). Hydrodynamic gliding models indicated negative buoyancy of tissue body density (1038.8± 1.6 kg m–3, ±95% credible interval, CI) and similar diving gas volume (34.6±0.6 ml kg−1, ±95% CI) to those in other deep-diving toothed whales. High diving metabolic rate and costly negative buoyancy imply a ‘spend more, gain more’ strategy of long-finned pilot whales, differing from that in other deep-diving toothed whales, which limits the costs of locomotion during foraging. We also found that net buoyancy affected the optimal speed: high transit speeds gradually decreased during ascent as the whales approached neutral buoyancy owing to gas expansion.
format Article in Journal/Newspaper
author Aoki, Kagari
Sato, Katsufumi
Isojunno, Saana
Narazaki, Tomoko
Miller, Patrick J.O.
author_facet Aoki, Kagari
Sato, Katsufumi
Isojunno, Saana
Narazaki, Tomoko
Miller, Patrick J.O.
author_sort Aoki, Kagari
title High diving metabolic rate indicated by high-speed transit to depth in negatively buoyant long-finned pilot whales
title_short High diving metabolic rate indicated by high-speed transit to depth in negatively buoyant long-finned pilot whales
title_full High diving metabolic rate indicated by high-speed transit to depth in negatively buoyant long-finned pilot whales
title_fullStr High diving metabolic rate indicated by high-speed transit to depth in negatively buoyant long-finned pilot whales
title_full_unstemmed High diving metabolic rate indicated by high-speed transit to depth in negatively buoyant long-finned pilot whales
title_sort high diving metabolic rate indicated by high-speed transit to depth in negatively buoyant long-finned pilot whales
publishDate 2017
url https://research-portal.st-andrews.ac.uk/en/researchoutput/high-diving-metabolic-rate-indicated-by-highspeed-transit-to-depth-in-negatively-buoyant-longfinned-pilot-whales(fcea903a-5609-43d4-b6f4-bc094b5c8425).html
https://doi.org/10.1242/jeb.158287
https://research-repository.st-andrews.ac.uk/bitstream/10023/16272/1/Miller_2017_JEB_HighDiving_VoR.pdf
genre toothed whales
genre_facet toothed whales
op_source Aoki , K , Sato , K , Isojunno , S , Narazaki , T & Miller , P J O 2017 , ' High diving metabolic rate indicated by high-speed transit to depth in negatively buoyant long-finned pilot whales ' , Journal of Experimental Biology , vol. 220 , no. 20 , pp. 3802-3811 . https://doi.org/10.1242/jeb.158287
op_relation https://research-portal.st-andrews.ac.uk/en/researchoutput/high-diving-metabolic-rate-indicated-by-highspeed-transit-to-depth-in-negatively-buoyant-longfinned-pilot-whales(fcea903a-5609-43d4-b6f4-bc094b5c8425).html
op_rights info:eu-repo/semantics/openAccess
op_doi https://doi.org/10.1242/jeb.158287
container_title Journal of Experimental Biology
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