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 |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://pure.au.dk/portal/da/publications/nightlife-of-brydes-whales(19cbcd28-194d-4667-bc4b-0dbd312d2b5a).html https://doi.org/10.1007/s00265-018-2492-8 |
id |
ftuniaarhuspubl:oai:pure.atira.dk:publications/19cbcd28-194d-4667-bc4b-0dbd312d2b5a |
---|---|
record_format |
openpolar |
spelling |
ftuniaarhuspubl:oai:pure.atira.dk:publications/19cbcd28-194d-4667-bc4b-0dbd312d2b5a 2023-12-03T10:20:01+01:00 Night-life of Bryde's whales:ecological implications of resting in a baleen whale Izadi, Sahar Johnson, Mark Aguilar de Soto, Natacha Constantine, Rochelle 2018-05 https://pure.au.dk/portal/da/publications/nightlife-of-brydes-whales(19cbcd28-194d-4667-bc4b-0dbd312d2b5a).html https://doi.org/10.1007/s00265-018-2492-8 eng eng https://pure.au.dk/portal/da/publications/nightlife-of-brydes-whales(19cbcd28-194d-4667-bc4b-0dbd312d2b5a).html info:eu-repo/semantics/restrictedAccess Izadi , S , Johnson , M , Aguilar de Soto , N & 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 DIEL VERTICAL MIGRATION SLOW-WAVE SLEEP HUMPBACK WHALES FORAGING BEHAVIOR MEGAPTERA-NOVAEANGLIAE BALAENOPTERA-EDENI MAMMALIAN SLEEP MARINE MAMMALS NORTH PACIFIC HAURAKI GULF article 2018 ftuniaarhuspubl https://doi.org/10.1007/s00265-018-2492-8 2023-11-08T23:59:25Z 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. Significant statement All mammals need to rest periodically and whales are no exception. But while resting land mammals can be observed directly, little is known about when and how whales rest; even though lower vigilance levels during resting could make them more vulnerable to threats such as collisions with boat traffic. We used sound and movement logging tags on resident Bryde'swhales in a busy gulf to study their daily activity patterns. We found that, while whales were active during daytime making energetic lunges to capture tonnes of plankton, they dedicated much of the ... Article in Journal/Newspaper baleen whale baleen whales Megaptera novaeangliae Aarhus University: Research New Zealand Pacific Behavioral Ecology and Sociobiology 72 5 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Rest Sleep Whales Diel behavior Accelerometry Biologging DIEL VERTICAL MIGRATION SLOW-WAVE SLEEP HUMPBACK WHALES FORAGING BEHAVIOR MEGAPTERA-NOVAEANGLIAE BALAENOPTERA-EDENI MAMMALIAN SLEEP MARINE MAMMALS NORTH PACIFIC HAURAKI GULF |
spellingShingle |
Rest Sleep Whales Diel behavior Accelerometry Biologging DIEL VERTICAL MIGRATION SLOW-WAVE SLEEP HUMPBACK WHALES FORAGING BEHAVIOR MEGAPTERA-NOVAEANGLIAE BALAENOPTERA-EDENI MAMMALIAN SLEEP MARINE MAMMALS NORTH PACIFIC HAURAKI GULF Izadi, Sahar Johnson, Mark Aguilar de Soto, Natacha 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 DIEL VERTICAL MIGRATION SLOW-WAVE SLEEP HUMPBACK WHALES FORAGING BEHAVIOR MEGAPTERA-NOVAEANGLIAE BALAENOPTERA-EDENI MAMMALIAN SLEEP MARINE MAMMALS NORTH PACIFIC HAURAKI GULF |
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. Significant statement All mammals need to rest periodically and whales are no exception. But while resting land mammals can be observed directly, little is known about when and how whales rest; even though lower vigilance levels during resting could make them more vulnerable to threats such as collisions with boat traffic. We used sound and movement logging tags on resident Bryde'swhales in a busy gulf to study their daily activity patterns. We found that, while whales were active during daytime making energetic lunges to capture tonnes of plankton, they dedicated much of the ... |
format |
Article in Journal/Newspaper |
author |
Izadi, Sahar Johnson, Mark Aguilar de Soto, Natacha Constantine, Rochelle |
author_facet |
Izadi, Sahar Johnson, Mark Aguilar de Soto, Natacha 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://pure.au.dk/portal/da/publications/nightlife-of-brydes-whales(19cbcd28-194d-4667-bc4b-0dbd312d2b5a).html https://doi.org/10.1007/s00265-018-2492-8 |
geographic |
New Zealand Pacific |
geographic_facet |
New Zealand Pacific |
genre |
baleen whale baleen whales Megaptera novaeangliae |
genre_facet |
baleen whale baleen whales Megaptera novaeangliae |
op_source |
Izadi , S , Johnson , M , Aguilar de Soto , N & 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://pure.au.dk/portal/da/publications/nightlife-of-brydes-whales(19cbcd28-194d-4667-bc4b-0dbd312d2b5a).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_ |
1784267417202982912 |