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...
Published in: | Journal of Experimental Biology |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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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 |
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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 |
container_volume |
220 |
container_issue |
20 |
container_start_page |
3802 |
op_container_end_page |
3811 |
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1802650714099417088 |