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Keywords: buoyancy
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Journal Articles
J Exp Biol (2021) 224 (2): jeb235507.
Published: 26 January 2021
... that total lung capacity is overestimated by established allometric relationships, and affirms that body density and net vertical forces influence the cost of diving. Pusa hispida Buoyancy Computed tomography Diving physiology Total lung capacity A key question in comparative physiology...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (9): jeb222943.
Published: 11 May 2020
... (11 km, 1100 bar), theoretically providing buoyancy far beyond the maximum depth of occurrence (3700 m) of sharks. However, Δρ does change significantly with temperature and we show that the combined effects of pressure and temperature can decrease buoyancy of oil by up to 10% between the surface...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (23): 4463–4470.
Published: 01 December 2017
... for the brood weight on the anterior portion of their body. For fishes with a compartmentalized swim bladder, gas distribution between the chambers may aid in regulating buoyancy during brooding. To test this hypothesis, we took radiographs of Astatotilapia burtoni to compare the swim bladder morphology...
Journal Articles
J Exp Biol (2017) 220 (4): 597–606.
Published: 15 February 2017
... and activity by controlling their net buoyancy; however, few buoyancy studies have been conducted on physostomous fish in the wild. We deployed accelerometers on free-ranging channel catfish, Ictalurus punctatus , in both lentic and lotic environments to quantify their swimming activity, and to determine...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (16): 2458–2468.
Published: 15 August 2016
... 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...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (5): 615–625.
Published: 01 March 2016
..., working hypotheses: (1) the urea-based osmoregulatory strategy of chondrichthyans might conflict with the interactive effects of low temperature and high pressure on protein and membrane function at great depth; (2) the reliance on lipid accumulation for buoyancy in chondrichthyans has a unique energetic...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (21): 3478–3486.
Published: 01 November 2015
... Anisops deanei does exchange gases with the water. Our results indicate that approximately 20% of O 2 consumed during a dive is obtained directly from the water. Oxygen from the water complements that released from the haemoglobin, extending the period of near-neutral buoyancy and increasing dive duration...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (7): 1099–1110.
Published: 01 April 2015
... for this species-rich group to occupy freshwater systems. Using hydromechanical modeling, we show that occurrence in fresh water results in a two- to three-fold increase in negative buoyancy for sharks and rays. This carries the energetic cost of lift production and results in increased buoyancy-dependent...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (14): 2609–2619.
Published: 15 July 2014
..., gliding down at slower speeds, and reduced their ascent swimming effort to maintain a nearly constant swimming speed as their buoyancy increased. One per cent of seal density variation over time was found to induce a 20% variation in swimming effort during dives with direct consequences on dive duration...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (21): 3685–3692.
Published: 01 November 2012
... efficiency of marine animals is primarily determined by their physiological and mechanical characteristics. This efficiency may be apparent via examination of biomechanical performance (e.g. stroke frequency and amplitude, change in buoyancy or body angle, etc.), which itself may be modulated according...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (20): 3622–3630.
Published: 15 October 2012
... density of divers, which changes with body condition, determines the apparent weight (buoyancy) of divers, which may affect round-trip cost-of-transport (COT) between the surface and depth. We evaluated alternative predictions from external-work and actuator-disc theory of how non-neutral buoyancy affects...
Includes: Supplementary data
Journal Articles
J Exp Biol (2011) 214 (17): 2962–2972.
Published: 01 September 2011
...Matthew R. Stoyek; Frank M. Smith; Roger P. Croll SUMMARY Many teleosts use gas-filled swimbladders to control buoyancy and influence three-dimensional orientation (pitch and roll). However, swimbladder volume, and its contributions to these functions, varies with depth-related pressure according...
Includes: Supplementary data
Journal Articles
J Exp Biol (2011) 214 (17): 2973–2987.
Published: 01 September 2011
... measurements determined by isotope dilution, and therefore have the potential to track changes in body condition of a wide range of freely diving animals. Gliding during ascent and descent clearly increased and stroke rate decreased when buoyancy manipulations aided the direction of vertical transit...
Includes: Supplementary data
Journal Articles
J Exp Biol (2010) 213 (14): 2536–2546.
Published: 15 July 2010
...Tristan C. Dumbarton; Matthew Stoyek; Roger P. Croll; Frank M. Smith SUMMARY Many teleosts actively regulate buoyancy by adjusting gas volume in the swimbladder. In physostomous fishes such as the zebrafish, a connection is maintained between the swimbladder and the oesophagus via the pneumatic...
Journal Articles
J Exp Biol (2008) 211 (24): 3790–3799.
Published: 15 December 2008
...Philip G. D. Matthews; Roger S. Seymour SUMMARY Unlike all other diving insects, backswimmers of the genus Anisops can exploit the pelagic zone by temporarily achieving near-neutral buoyancy during the course of a dive. They begin a dive positively buoyant due to the large volume of air carried...
Journal Articles
J Exp Biol (2008) 211 (7): 1141–1147.
Published: 01 April 2008
... of buoyancy as well as the center of mass. The relative position of the center of mass and the center of buoyancy is a principle determinant of the stability and maneuverability of the organism( Webb, 2002 ). A torque will be exerted along the long axis of the body if the center of buoyancy is either...
Journal Articles
J Exp Biol (2006) 209 (17): 3269–3280.
Published: 01 September 2006
...Yuuki Watanabe; Eugene A. Baranov; Katsufumi Sato; Yasuhiko Naito; Nobuyuki Miyazaki SUMMARY Buoyancy is one of the primary external forces acting on air-breathing divers and it can affect their swimming energetics. Because the body composition of marine mammals (i.e. the relative amounts of lower...
Journal Articles
J Exp Biol (2006) 209 (11): 2170–2181.
Published: 01 June 2006
... organisms maintain upright postures in the water column by one of two mechanisms, stiffness or buoyancy. Turbinaria ornata is a tropical macroalga that uses either buoyancy or flexural stiffness ( EI ), depending on its flow habitat. This study used physical models of T. ornata to compare the effect...
Journal Articles
J Exp Biol (2006) 209 (7): 1217–1230.
Published: 01 April 2006
...Yutaka Watanuki; Sarah Wanless; Mike Harris; James R. Lovvorn; Masamine Miyazaki; Hideji Tanaka; Katsufumi Sato SUMMARY In diving birds, the volume and resulting buoyancy of air spaces changes with dive depth, and hydrodynamic drag varies with swim speed. These factors are important in the dive...
Journal Articles
J Exp Biol (2005) 208 (13): 2549–2554.
Published: 01 July 2005
.... In those cases,birds could increase swim speed without strokes for the final seconds before exit and they only increased the steepness of their body angles as they surfaced, which indicates that the speed required for leaps by emperor penguins were aided by buoyancy, and that penguins can sometimes exit...
Includes: Multimedia, Supplementary data