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Kagari Aoki - One of the best experts on this subject based on the ideXlab platform.
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Body Density of humpback whales megaptera novaengliae in feeding aggregations estimated from hydrodynamic gliding performance
PLOS ONE, 2018Co-Authors: Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Douglas P Nowacek, Rene Swift, Ari S Friedlaender, Christian RampAbstract:Many baleen whales undertake annual fasting and feeding cycles, resulting in substantial changes in their Body condition, an important factor affecting fitness. As a measure of lipid-store Body condition, tissue Density of a few deep diving marine mammals has been estimated using a hydrodynamic glide model of drag and buoyancy forces. Here, we applied the method to shallow-diving humpback whales (Megaptera novaeangliae) in North Atlantic and Antarctic feeding aggregations. High-resolution 3-axis acceleration, depth and speed data were collected from 24 whales. Measured values of acceleration during 5 s glides were fitted to a hydrodynamic glide model to estimate unknown parameters (tissue Density, drag term and diving gas volume) in a Bayesian framework. Estimated species-average tissue Density (1031.6 ± 2.1 kg m-3, ±95% credible interval) indicates that humpback whale tissue is typically negatively buoyant although there was a large inter-individual variation ranging from 1025.2 to 1043.1 kg m-3. The precision of the individual estimates was substantially finer than the variation across different individual whales, demonstrating a progressive decrease in tissue Density throughout the feeding season and comparably high lipid-store in pregnant females. The drag term (CDAm-1) was estimated to be relatively high, indicating a large effect of lift-related induced drag for humpback whales. Our results show that tissue Density of shallow diving baleen whales can be estimated using the hydrodynamic gliding model, although cross-validation with other techniques is an essential next step. This method for estimating Body condition is likely to be broadly applicable across a range of aquatic animals and environments.
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correction Body Density and diving gas volume of the northern bottlenose whale hyperoodon ampullatus
The Journal of Experimental Biology, 2016Co-Authors: Patrick J. O. Miller, Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Katsufumi SatoAbstract:There was an error published in J. Exp. Biol. 219 , [2458-2468][1]. Eqn 1 was presented incorrectly. A ‘−1’ was missing after the ratio of densities, and the subscript of the first instance of the Density of seawater (ρsw) was given incorrectly as ‘w’ instead of ‘sw’. The original
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Body Density and diving gas volume of the northern bottlenose whale hyperoodon ampullatus
The Journal of Experimental Biology, 2016Co-Authors: Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Patrick J. O. Miller, Katsufumi SatoAbstract: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.
Tomoko Narazaki - One of the best experts on this subject based on the ideXlab platform.
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Body Density of humpback whales megaptera novaengliae in feeding aggregations estimated from hydrodynamic gliding performance
PLOS ONE, 2018Co-Authors: Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Douglas P Nowacek, Rene Swift, Ari S Friedlaender, Christian RampAbstract:Many baleen whales undertake annual fasting and feeding cycles, resulting in substantial changes in their Body condition, an important factor affecting fitness. As a measure of lipid-store Body condition, tissue Density of a few deep diving marine mammals has been estimated using a hydrodynamic glide model of drag and buoyancy forces. Here, we applied the method to shallow-diving humpback whales (Megaptera novaeangliae) in North Atlantic and Antarctic feeding aggregations. High-resolution 3-axis acceleration, depth and speed data were collected from 24 whales. Measured values of acceleration during 5 s glides were fitted to a hydrodynamic glide model to estimate unknown parameters (tissue Density, drag term and diving gas volume) in a Bayesian framework. Estimated species-average tissue Density (1031.6 ± 2.1 kg m-3, ±95% credible interval) indicates that humpback whale tissue is typically negatively buoyant although there was a large inter-individual variation ranging from 1025.2 to 1043.1 kg m-3. The precision of the individual estimates was substantially finer than the variation across different individual whales, demonstrating a progressive decrease in tissue Density throughout the feeding season and comparably high lipid-store in pregnant females. The drag term (CDAm-1) was estimated to be relatively high, indicating a large effect of lift-related induced drag for humpback whales. Our results show that tissue Density of shallow diving baleen whales can be estimated using the hydrodynamic gliding model, although cross-validation with other techniques is an essential next step. This method for estimating Body condition is likely to be broadly applicable across a range of aquatic animals and environments.
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correction Body Density and diving gas volume of the northern bottlenose whale hyperoodon ampullatus
The Journal of Experimental Biology, 2016Co-Authors: Patrick J. O. Miller, Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Katsufumi SatoAbstract:There was an error published in J. Exp. Biol. 219 , [2458-2468][1]. Eqn 1 was presented incorrectly. A ‘−1’ was missing after the ratio of densities, and the subscript of the first instance of the Density of seawater (ρsw) was given incorrectly as ‘w’ instead of ‘sw’. The original
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Body Density and diving gas volume of the northern bottlenose whale hyperoodon ampullatus
The Journal of Experimental Biology, 2016Co-Authors: Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Patrick J. O. Miller, Katsufumi SatoAbstract: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.
Patrick J. O. Miller - One of the best experts on this subject based on the ideXlab platform.
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correction Body Density and diving gas volume of the northern bottlenose whale hyperoodon ampullatus
The Journal of Experimental Biology, 2016Co-Authors: Patrick J. O. Miller, Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Katsufumi SatoAbstract:There was an error published in J. Exp. Biol. 219 , [2458-2468][1]. Eqn 1 was presented incorrectly. A ‘−1’ was missing after the ratio of densities, and the subscript of the first instance of the Density of seawater (ρsw) was given incorrectly as ‘w’ instead of ‘sw’. The original
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Body Density and diving gas volume of the northern bottlenose whale hyperoodon ampullatus
The Journal of Experimental Biology, 2016Co-Authors: Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Patrick J. O. Miller, Katsufumi SatoAbstract: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.
Katsufumi Sato - One of the best experts on this subject based on the ideXlab platform.
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correction Body Density and diving gas volume of the northern bottlenose whale hyperoodon ampullatus
The Journal of Experimental Biology, 2016Co-Authors: Patrick J. O. Miller, Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Katsufumi SatoAbstract:There was an error published in J. Exp. Biol. 219 , [2458-2468][1]. Eqn 1 was presented incorrectly. A ‘−1’ was missing after the ratio of densities, and the subscript of the first instance of the Density of seawater (ρsw) was given incorrectly as ‘w’ instead of ‘sw’. The original
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Body Density and diving gas volume of the northern bottlenose whale hyperoodon ampullatus
The Journal of Experimental Biology, 2016Co-Authors: Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Patrick J. O. Miller, Katsufumi SatoAbstract: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.
Saana Isojunno - One of the best experts on this subject based on the ideXlab platform.
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Body Density of humpback whales megaptera novaengliae in feeding aggregations estimated from hydrodynamic gliding performance
PLOS ONE, 2018Co-Authors: Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Douglas P Nowacek, Rene Swift, Ari S Friedlaender, Christian RampAbstract:Many baleen whales undertake annual fasting and feeding cycles, resulting in substantial changes in their Body condition, an important factor affecting fitness. As a measure of lipid-store Body condition, tissue Density of a few deep diving marine mammals has been estimated using a hydrodynamic glide model of drag and buoyancy forces. Here, we applied the method to shallow-diving humpback whales (Megaptera novaeangliae) in North Atlantic and Antarctic feeding aggregations. High-resolution 3-axis acceleration, depth and speed data were collected from 24 whales. Measured values of acceleration during 5 s glides were fitted to a hydrodynamic glide model to estimate unknown parameters (tissue Density, drag term and diving gas volume) in a Bayesian framework. Estimated species-average tissue Density (1031.6 ± 2.1 kg m-3, ±95% credible interval) indicates that humpback whale tissue is typically negatively buoyant although there was a large inter-individual variation ranging from 1025.2 to 1043.1 kg m-3. The precision of the individual estimates was substantially finer than the variation across different individual whales, demonstrating a progressive decrease in tissue Density throughout the feeding season and comparably high lipid-store in pregnant females. The drag term (CDAm-1) was estimated to be relatively high, indicating a large effect of lift-related induced drag for humpback whales. Our results show that tissue Density of shallow diving baleen whales can be estimated using the hydrodynamic gliding model, although cross-validation with other techniques is an essential next step. This method for estimating Body condition is likely to be broadly applicable across a range of aquatic animals and environments.
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correction Body Density and diving gas volume of the northern bottlenose whale hyperoodon ampullatus
The Journal of Experimental Biology, 2016Co-Authors: Patrick J. O. Miller, Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Katsufumi SatoAbstract:There was an error published in J. Exp. Biol. 219 , [2458-2468][1]. Eqn 1 was presented incorrectly. A ‘−1’ was missing after the ratio of densities, and the subscript of the first instance of the Density of seawater (ρsw) was given incorrectly as ‘w’ instead of ‘sw’. The original
-
Body Density and diving gas volume of the northern bottlenose whale hyperoodon ampullatus
The Journal of Experimental Biology, 2016Co-Authors: Saana Isojunno, Tomoko Narazaki, Kagari Aoki, Sophie Smout, Patrick J. O. Miller, Katsufumi SatoAbstract: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.