...Samantha Alex Gordine; Michael Fedak; Lars Boehme ABSTRACT In southern elephant seals ( Mirounga leonina ), fasting- and foraging-related fluctuations in body composition are reflected by buoyancy changes. Such buoyancy changes can be monitored by measuring changes in the rate at which a seal...

... defined. To address the hypothesis that apnea in seals is not associated with increased oxidative damage, blood samples were collected from northern elephant seal pups ( N =6) during eupnea, rest- and voluntary submersion-associated apneas, and post-apnea (recovery). Plasma 4-hydroxynonenal (HNE), 8...

... altered the body density and mass of three free-ranging elephant seals by remotely detaching weights and floats while monitoring their swimming speed, depth and three-axis acceleration with a high-resolution data logger. Cross-validation of three methods for estimating body density from hydrodynamic...

... stores (blood volume and muscle myoglobin) and diving behavior in adult female northern elephant seals, Mirounga angustirostris , to investigate age-related effects on diving performance. Blood volume averaged 74.4±17.0 liters in female elephant seals or 20.2±2.0% of body mass. Plasma volume averaged...

...Melinda A. Fowler; Cory D. Champagne; Dorian S. Houser; Daniel E. Crocker SUMMARY Northern elephant seals exhibit the rare strategy of fasting and lactating concomitantly. We investigated hormonal regulation of glucose clearance in northern elephant seals using glucose tolerance tests (GTT...

...T. K. Stockard; D. H. Levenson; L. Berg; J. R. Fransioli; E. A. Baranov; P. J. Ponganis SUMMARY Blood gases ( P O 2, P CO 2, pH), oxygen content, hematocrit and hemoglobin concentration were measured during rest-associated apneas of nine juvenile northern elephant seals. In conjunction with blood...

.... ( 2000 ). Foraging ecology of northern elephant seals. Ecol. Monog. 70 , 353 -382. Laidre, K. L., Heide-Jorgensen, M. P., Logsdon, M. L., Hobbs, R. C., Dietz, R. and VanBlaricom, G. R. ( 2004 ). Fractal analysis of narwhal space use patterns. Zoology 107 , 3 -11. Liebovitch, L. S...

... analyses of marine vertebrates. In a fluid marine environment,characterized by curvilinear structures, linearly interpolated track data are not realistic. Based on these two facts, we interpolated tracking data from albatrosses, penguins, boobies, sea lions, fur seals and elephant seals using six...

... Imaging and phase contrast flow analysis to obtain accurate flow measurements from the base of the aorta. Heart rate ( f h )and cardiac output ( Q̇ ) were measured before, during and after dives in four restrained juvenile northern elephant seals, Mirounga angustirostris , and stroke volume( V s...

.... This creates a conflict in animals undergoing fasts concurrently with metabolically challenging activities. This study investigated glucose metabolism in fasting and developing neonatal elephant seals. Glucose production and glucose cycle activity were measured early (2 weeks) and late(6 weeks...

...Martin Biuw; Bernie McConnell; Corey J. A. Bradshaw; Harry Burton; Mike Fedak SUMMARY Elephant seals regularly perform dives during which they spend a large proportion of time drifting passively through the water column. The rate of vertical change in depth during these `drift' dives is largely...

... dives in free-ranging northern elephant seals Mirounga angustirostris . We recorded f B and f H acoustically in six translocated juveniles, 1.8–2.4 years old, and three migrating adult males from the rookery at Año Nuevo, California, USA. To each seal, we attached a diving instrument to record...

...R. D. Andrews; D. R. Jones; J. D. Williams; P. H. Thorson; G. W. Oliver; D. P. Costa; B. J. Le Boeuf ABSTRACT Heart rates of northern elephant seals diving at sea and during apnoea on land were monitored to test whether a cardiac response to submergence is an important factor in their ability...

...Anthony C. Huntley; Daniel P. Costa; Robert D. Rubin ABSTRACT Elephant seals fast completely from food and water for 1-3 months during terrestrial breeding. Temporal countercurrent heat exchange in the nasal passage reduces expired air temperature (T e ) below body temperature (T b ) Ata mean...