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Body density and diving gas volume of the northern bottlenose whale (Hyperoodon ampullatus)

Miller, Patrick ; Narazaki, Tomoko ; Isojunno, Saana ; Aoki, Kagari ; Smout, Sophie ; Sato, Katsufumi

Journal of experimental biology, 2016-08, Vol.219 (Pt 16), p.2458-2468 [Periódico revisado por pares]

England: The Company of Biologists Ltd

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  • Título:
    Body density and diving gas volume of the northern bottlenose whale (Hyperoodon ampullatus)
  • Autor: Miller, Patrick ; Narazaki, Tomoko ; Isojunno, Saana ; Aoki, Kagari ; Smout, Sophie ; Sato, Katsufumi
  • Assuntos: Acceleration ; Animals ; Body Composition - physiology ; Cetacea ; Databases as Topic ; Diving - physiology ; Gases - metabolism ; Hyperoodon ampullatus ; Models, Biological ; Whales - physiology
  • É parte de: Journal of experimental biology, 2016-08, Vol.219 (Pt 16), p.2458-2468
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: Diving lung volume and tissue density, reflecting lipid store volume, are important physiological parameters that have only been estimated for a few breath-hold diving species. We fitted 12 northern bottlenose whales with data loggers that recorded depth, 3-axis acceleration and speed either with a fly-wheel or from change of depth corrected by pitch angle. We fitted measured values of the change in speed during 5 s descent and ascent glides to a hydrodynamic model of drag and buoyancy forces using a Bayesian estimation framework. The resulting estimate of diving gas volume was 27.4±4.2 (95% credible interval, CI) ml kg(-1), closely matching the measured lung capacity of the species. Dive-by-dive variation in gas volume did not correlate with dive depth or duration. Estimated body densities of individuals ranged from 1028.4 to 1033.9 kg m(-3) at the sea surface, indicating overall negative tissue buoyancy of this species in seawater. Body density estimates were highly precise with ±95% CI ranging from 0.1 to 0.4 kg m(-3), which would equate to a precision of <0.5% of lipid content based upon extrapolation from the elephant seal. Six whales tagged near Jan Mayen (Norway, 71°N) had lower body density and were closer to neutral buoyancy than six whales tagged in the Gully (Nova Scotia, Canada, 44°N), a difference that was consistent with the amount of gliding observed during ascent versus descent phases in these animals. Implementation of this approach using longer-duration tags could be used to track longitudinal changes in body density and lipid store body condition of free-ranging cetaceans.
  • Editor: England: The Company of Biologists Ltd
  • Idioma: Inglês
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