Night-life of Bryde’s whales:ecological implications of resting in a baleen whale
Many animals require intervals of rest or sleep in which their vigilance level is reduced. For marine fauna, including large baleen whales, resting potentially increases the risk of predation and vessel-strike. However, there is scarce information about how, and how often, whales rest which makes it...
Published in: | Behavioral Ecology and Sociobiology |
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2018
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/1bc4e420-cecf-441e-a985-ee58a524e7b8 2024-06-23T07:51:34+00:00 Night-life of Bryde’s whales:ecological implications of resting in a baleen whale Izadi, Sahar Johnson, Mark de Soto, Natacha Aguilar Constantine, Rochelle 2018-05 https://research-portal.st-andrews.ac.uk/en/researchoutput/nightlife-of-brydes-whales(1bc4e420-cecf-441e-a985-ee58a524e7b8).html https://doi.org/10.1007/s00265-018-2492-8 eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/nightlife-of-brydes-whales(1bc4e420-cecf-441e-a985-ee58a524e7b8).html info:eu-repo/semantics/restrictedAccess Izadi , S , Johnson , M , de Soto , N A & Constantine , R 2018 , ' Night-life of Bryde’s whales : ecological implications of resting in a baleen whale ' , Behavioral Ecology and Sociobiology , vol. 72 , no. 5 , 78 . https://doi.org/10.1007/s00265-018-2492-8 Rest Sleep Whales Diel behavior Accelerometry Biologging article 2018 ftunstandrewcris https://doi.org/10.1007/s00265-018-2492-8 2024-06-13T01:00:57Z Many animals require intervals of rest or sleep in which their vigilance level is reduced. For marine fauna, including large baleen whales, resting potentially increases the risk of predation and vessel-strike. However, there is scarce information about how, and how often, whales rest which makes it difficult to assess the severity of this risk. Here we examine resting patterns of Bryde’s whales ( Baleaenoptera edeni / brydei ), using data collected by sound and movement archival tags (DTAGs) deployed on four whales in the Hauraki Gulf, New Zealand. To identify low activity levels associated with resting, we used RMS jerk and mean flow noise (as proxies for activity and speed, respectively), as well as changes in dive patterns (dive depth and shape), fluking, and respiration rates. The tagged whales showed strong diel differences in behavior with long periods of low activity consistent with resting occurring exclusively during the night. This pattern indicates that either (i) Bryde’s whales rely on senses that are less effective in the dark to locate prey, or (ii) that prey aggregate less densely at night, making foraging less efficient. Thus, Bryde’s whales conserve energy through rest during times when the net benefit of foraging effort is low. However, by reducing their interaction level with their environment, night-time resting also makes Bryde’s whales more vulnerable to vessel strikes, an important source of mortality for cetaceans. Article in Journal/Newspaper baleen whale baleen whales University of St Andrews: Research Portal New Zealand Behavioral Ecology and Sociobiology 72 5 |
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Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Rest Sleep Whales Diel behavior Accelerometry Biologging |
spellingShingle |
Rest Sleep Whales Diel behavior Accelerometry Biologging Izadi, Sahar Johnson, Mark de Soto, Natacha Aguilar Constantine, Rochelle Night-life of Bryde’s whales:ecological implications of resting in a baleen whale |
topic_facet |
Rest Sleep Whales Diel behavior Accelerometry Biologging |
description |
Many animals require intervals of rest or sleep in which their vigilance level is reduced. For marine fauna, including large baleen whales, resting potentially increases the risk of predation and vessel-strike. However, there is scarce information about how, and how often, whales rest which makes it difficult to assess the severity of this risk. Here we examine resting patterns of Bryde’s whales ( Baleaenoptera edeni / brydei ), using data collected by sound and movement archival tags (DTAGs) deployed on four whales in the Hauraki Gulf, New Zealand. To identify low activity levels associated with resting, we used RMS jerk and mean flow noise (as proxies for activity and speed, respectively), as well as changes in dive patterns (dive depth and shape), fluking, and respiration rates. The tagged whales showed strong diel differences in behavior with long periods of low activity consistent with resting occurring exclusively during the night. This pattern indicates that either (i) Bryde’s whales rely on senses that are less effective in the dark to locate prey, or (ii) that prey aggregate less densely at night, making foraging less efficient. Thus, Bryde’s whales conserve energy through rest during times when the net benefit of foraging effort is low. However, by reducing their interaction level with their environment, night-time resting also makes Bryde’s whales more vulnerable to vessel strikes, an important source of mortality for cetaceans. |
format |
Article in Journal/Newspaper |
author |
Izadi, Sahar Johnson, Mark de Soto, Natacha Aguilar Constantine, Rochelle |
author_facet |
Izadi, Sahar Johnson, Mark de Soto, Natacha Aguilar Constantine, Rochelle |
author_sort |
Izadi, Sahar |
title |
Night-life of Bryde’s whales:ecological implications of resting in a baleen whale |
title_short |
Night-life of Bryde’s whales:ecological implications of resting in a baleen whale |
title_full |
Night-life of Bryde’s whales:ecological implications of resting in a baleen whale |
title_fullStr |
Night-life of Bryde’s whales:ecological implications of resting in a baleen whale |
title_full_unstemmed |
Night-life of Bryde’s whales:ecological implications of resting in a baleen whale |
title_sort |
night-life of bryde’s whales:ecological implications of resting in a baleen whale |
publishDate |
2018 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/nightlife-of-brydes-whales(1bc4e420-cecf-441e-a985-ee58a524e7b8).html https://doi.org/10.1007/s00265-018-2492-8 |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
baleen whale baleen whales |
genre_facet |
baleen whale baleen whales |
op_source |
Izadi , S , Johnson , M , de Soto , N A & Constantine , R 2018 , ' Night-life of Bryde’s whales : ecological implications of resting in a baleen whale ' , Behavioral Ecology and Sociobiology , vol. 72 , no. 5 , 78 . https://doi.org/10.1007/s00265-018-2492-8 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/nightlife-of-brydes-whales(1bc4e420-cecf-441e-a985-ee58a524e7b8).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s00265-018-2492-8 |
container_title |
Behavioral Ecology and Sociobiology |
container_volume |
72 |
container_issue |
5 |
_version_ |
1802642684023668736 |