Seasonal variations in basal metabolic rate, lower critical temperature and responses to temporary starvation in the arctic fox (Alopex lagopus) from Svalbard

Polar Biology ◽  
2005 ◽  
Vol 29 (4) ◽  
pp. 308-319 ◽  
Author(s):  
Britt N. Fuglesteg ◽  
Øyvind E. Haga ◽  
Lars P. Folkow ◽  
Eva Fuglei ◽  
Arnoldus Schytte Blix
Keyword(s):  
Critical Temperature ◽  
Metabolic Rate ◽  
Basal Metabolic Rate ◽  
Seasonal Variations ◽  
The Arctic ◽  
Arctic Fox ◽  
Alopex Lagopus ◽  
Lower Critical Temperature

scholarly journals Laboratory Metabolism of Incubating Semipalmated Plovers

The Condor ◽  
2006 ◽  
Vol 108 (4) ◽  
pp. 966-970
Author(s):  
Mark Williamson ◽  
Joseph B. Williams ◽  
Erica Nol
Keyword(s):  
Critical Temperature ◽  
Metabolic Rate ◽  
Breeding Season ◽  
Basal Metabolic Rate ◽  
Low Temperatures ◽  
Thermal Conductance ◽  
Basal Metabolism ◽  
The Arctic ◽  
Lower Critical Temperature ◽  
Metabolic Data

Abstract Abstract The Semipalmated Plover (Charadriussemipalmatus), anarctic-nesting migratory shorebird, regularlyencounters low temperatures during the breedingseason. We measured the basal metabolism of adultsduring incubation at Churchill, Manitoba, Canada todetermine basal metabolic rate (BMR),lower critical temperature(Tlc), total evaporative waterloss (TEWL), and dry thermal conductance(Cm). BMR and Tlcwere 47.4 kJ day−1and 23.3°C, respectively, TEWL was2.5 mL H2O−d,and Cm was1.13 mW g−1 °C−1.Measured BMR and Tlc were consistentwith high values found for other shorebird speciesbreeding in the Arctic, while Cm was18% higher than predicted from allometricequations. These metabolic data suggest thatSemipalmated Plovers are adapted to balance therequirements of incubation against energetic andthermoregulatory demands in the Arctic, especiallyin harsh early breeding season conditions.

scholarly journals Energy Cost of Running in an Arctic Fox, Alopex lagopus

2003 ◽  
Vol 117 (3) ◽  
pp. 430 ◽  
Author(s):  
Eva Fuglei ◽  
Nils A. Øritsland
Keyword(s):  
Heart Rate ◽  
Metabolic Rate ◽  
Energy Cost ◽  
The Arctic ◽  
Arctic Fox ◽  
Alopex Lagopus ◽  
Energy Cost Of Running ◽  
Radio Transmitters ◽  
The Relationship ◽  
Determine Effect

This work was conducted to determine effect of season and starvation on metabolic rate during running in the Arctic Fox (Alopex lagopus) on Svalbard (78°55’N, 11°56’E), Norway. Indirect calorimetry was used to measure metabolic rate of foxes running on a treadmill and heart rate was monitored using implanted radio transmitters. The relationship between heart rate and metabolic rate was also examined. Metabolic rate increased with running speed. In July the metabolic rate during running almost fitted general equations predicted for mammals, while it was up to 20% lower in January, indicating seasonal variation in metabolic rate. There was a significant positive linear relationship between heart rate and weight specific metabolic rate, suggesting that heart rate can be used as an indicator of metabolic rate. Starvation for 11 days decreased the net cost of running by 13% in January and 17% in July, suggesting that a starved fox runs more energetically efficient than when fed. Heart rate measured in July decreased by 27% during starvation. Re-feeding reversed the starvation-induced reduction in metabolic rate and heart rate during running almost up to post-absorptive levels. The present results are from one fox, and must be considered as preliminary data until further studies are conducted.

Lower critical temperature and cold-induced thermogenesis of lean and overweight humans are inversely related to body mass and basal metabolic rate

2017 ◽  
Vol 69 ◽  
pp. 238-248 ◽  
Author(s):  
Kimberly J. Nahon ◽  
Mariëtte R. Boon ◽  
Fleur Doornink ◽  
Ingrid M. Jazet ◽  
Patrick C.N. Rensen ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Metabolic Rate ◽  
Body Mass ◽  
Basal Metabolic Rate ◽  
Lower Critical Temperature

Stability of basal metabolic rate on a polar expedition

1961 ◽  
Vol 16 (3) ◽  
pp. 397-400 ◽  
Author(s):  
H. E. Lewis ◽  
J. P. Masterton ◽  
S. Rosenbaum
Keyword(s):  
Young Adults ◽  
Metabolic Rate ◽  
Basal Metabolic Rate ◽  
Field Work ◽  
Basal Metabolism ◽  
The Arctic ◽  
Polar Regions ◽  
Exposure To Cold ◽  
Efficient Protection ◽  
At Home

The basal metabolism studied in 29 young adults on 349 occasions over 2 years in the Arctic was 37.4 (sd α 3.7) kcal/m-2/hr-1, and well within the normal British standards. The variability showed no relationship to season. On polar expeditions, men's physiologically significant exposure to cold is small because of efficient protection by clothing and shelter. Information is needed about precise differences of microclimate in the polar regions and at home. Field work could more profitably be directed to the cognate problem of costs of various activities in the cold rather than basal metabolic rate. Submitted on April 25, 1960

Regulation of metabolic rate in Svalbard and Norwegian reindeer

1984 ◽  
Vol 247 (5) ◽  
pp. R837-R841 ◽  
Author(s):  
K. J. Nilssen ◽  
J. A. Sundsfjord ◽  
A. S. Blix
Keyword(s):  
Body Weight ◽  
Critical Temperature ◽  
Food Intake ◽  
Metabolic Rate ◽  
Seasonal Changes ◽  
Serum Levels ◽  
Physiological Adaptation ◽  
Conservation Of Energy ◽  
Winter Food ◽  
Lower Critical Temperature

Food intake, body weight, serum levels of triiodothyronine (T3) and free thyroxine (FT4), and metabolic rate were measured at intervals in Svalbard (SR) and Norwegian (NR) reindeer. From summer to winter food intake decreased 57 (SR) and 55% (NR), while body weight decreased 8.6 (SR) and 3.8% (NR). In SR T3 and FT4 changed seasonally, whereas this was only evident for T3 in NR. Resting (standing) metabolic rate (RMR) in winter was 1.55 (SR) and 2.05 W X kg-1 (NR), lower critical temperature (TLC) being -50 (SR) and -30 degrees C (NR). RMR in summer was 2.15 (SR) and 2.95 W X kg-1 (NR), TLC being -15 (SR) and 0 degrees C (NR). Seasonal changes in T3 and FT4 did not coincide with changes in food intake or RMR in either SR or NR. RMR did, however, correlate with food intake. This indicates that seasonal changes in RMR are due to the thermic effects of feeding and represent no physiological adaptation aimed at conservation of energy during winter.

PARASITES OF THE ARCTIC FOX (ALOPEX LAGOPUS) IN ICELAND

1993 ◽  
Vol 29 (3) ◽  
pp. 440-446 ◽  
Author(s):  
K. Skirnisson ◽  
M. Eydal ◽  
E. Gunnarsson ◽  
P. Hersteinsson
Keyword(s):  
The Arctic ◽  
Arctic Fox ◽  
Alopex Lagopus
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