Daily Energy Expenditure and Water Flux of Free-Living Blanford's Foxes (Vulpes cana), a small Desert Carnivore

10.2307/5616 ◽  
1992 ◽  
Vol 61 (3) ◽  
pp. 611 ◽  
Author(s):  
Eli Geffen ◽  
A. Allan Degen ◽  
Michael Kam ◽  
Reuven Hefner ◽  
Kenneth A. Nagy
Keyword(s):  
Energy Expenditure ◽  
Water Flux ◽  
Daily Energy Expenditure ◽  
Free Living ◽  
Daily Energy

Flux hydriques et métabolisme énergétique dans un peuplement de Lacertidés des îles Kerkennah (Tunisie)

1988 ◽  
Vol 66 (3) ◽  
pp. 555-561 ◽  
Author(s):  
Roland Vernet ◽  
Claude Grenot ◽  
Saïd Nouira
Keyword(s):  
Energy Expenditure ◽  
Daily Activity ◽  
Water Flux ◽  
Sympatric Species ◽  
Doubly Labeled Water ◽  
Daily Energy Expenditure ◽  
Water Turnover ◽  
Semiarid Environment ◽  
Daily Energy ◽  
Active Forager

Water flux and daily energy expenditure were measured with doubly labeled water (3HH18O) in two insectivorous sympatric species of Lacertidae of Kerkennah islands (Tunisia), Eremias olivieri (mean body mass: 1.1 g) and Acanthodactylus pardalis (4.5 g) in a semiarid environment. Water turnover and field metabolic rate of Eremias olivieri (174 μL H2O g−1 d−1 and 250 J g−1 d−1) were, respectively, 2.5 and 5 times higher than those of Acanthodactylus pardalis (70 μL H2O g−1 d−1 and 52 J g−1 d−1). The water turnover of Eremias olivieri is one of the highest known among insectivorous lizards, and the daily energy expenditure of Acanthodactylus pardalis one of the lowest. The most plausible explanations are the differences in the size of the prey eaten by each species at this time of the season and in the duration of daily activity; the daily activity of Acanthodactylus pardalis is short (4.5 h d−1) although it is a sit-and-wait predator, whereas Eremias olivieri is active regularly every day for a longer period (7.5 h d−1) although it is an active forager. The high values of water turnover in Eremias olivieri suggest that food is not the only source of water for lizards in this particular insular environment.

Components and variations in daily energy expenditure of athletic and non-athletic adolescents in free-living conditions

2000 ◽  
Vol 84 (4) ◽  
pp. 531-539 ◽  
Author(s):  
Jérôme Ribeyre ◽  
Nicole Fellmann ◽  
Jean Vernet ◽  
Michel Delaître ◽  
Alain Chamoux ◽  
...  
Keyword(s):  
Energy Expenditure ◽  
Direct Method ◽  
Exercise Duration ◽  
Living Conditions ◽  
Fat Free Mass ◽  
Whole Body ◽  
Daily Energy Expenditure ◽  
Free Living ◽  
Daily Energy ◽  
Free Living Conditions

The objectives of the study were to determine: (1) daily energy expenditure (EE) of athletic and non-athletic adolescents of both sexes in free-living conditions; (2) day-to-day variations in daily EE during 1 week; (3) energy costs of the main activities; and (4) the effect of usual activity on EE during sleep, seated and miscellaneous activities. Fifty adolescents (four groups of eleven to fifteen boys or girls aged 16–19 years) participated in the study. Body composition was measured by the skinfold-thickness method, and VO2max and external mechanical power (EMP) by a direct method (respiratory gas exchanges) on a cycloergometer. Daily EE and partial EE in free-living conditions were computed from heart-rate (HR) recordings during seven consecutive days using individual prediction equations established from the data obtained during a 24 h period spent in whole-body calorimeters with similar activities. Fat-free mass (FFM), VO2max, EMP, daily EE and EE during sleep were significantly higher in athletic than in non-athletic subjects. After adjustment for FFM, VO2max, EMP, daily EE and EE during exercise were still higher in athletic than in non-athletic adolescents (P<0·001). However, adjusted sleeping EE was not significantly different between athletic and non-athletic adolescents. Increases in exercise EE were partly compensated for by significant reductions in EE during schoolwork and miscellaneous activities. Thus, the differences in daily EE between athletic and non-athletic subjects resulted mainly from increases in FFM and EE during exercise (duration and energy cost).

scholarly journals Daily energy expenditure during lactation is strongly selected in a free‐living mammal

2014 ◽  
Vol 29 (2) ◽  
pp. 195-208 ◽  
Author(s):  
Quinn E. Fletcher ◽  
John R. Speakman ◽  
Stan Boutin ◽  
Jeffrey E. Lane ◽  
Andrew G. McAdam ◽  
...  
Keyword(s):  
Energy Expenditure ◽  
Daily Energy Expenditure ◽  
Free Living ◽  
Daily Energy

Cost of locomotion and daily energy expenditure by free-living swift foxes (Vulpes velox): a seasonal comparison

1996 ◽  
Vol 74 (2) ◽  
pp. 283-290 ◽  
Author(s):  
Darrel F. Covell ◽  
David S. Miller ◽  
William H. Karasov
Keyword(s):  
Energy Expenditure ◽  
Allometric Equation ◽  
Activity Period ◽  
Daily Energy Expenditure ◽  
Free Living ◽  
Average Mass ◽  
Daily Movement ◽  
Vulpes Velox ◽  
Daily Energy ◽  
Movement Distance

We studied the daily energy expenditure of free-living nonreproductive carnivorous swift foxes (Vulpes velox, average mass 2.1 kg) on shortgrass prairie in southeastern Colorado in summer and winter in relation to air temperature, daily activity pattern, movement rate, and daily movement distance. The field metabolic rate (FMR) was measured with doubly labeled water, and activity and movements were monitored by radiotelemetry. During their nighttime activity period in winter, swift foxes traveled large distances (18.5 ± 0.6 km/d). Locomotion costs (estimated from daily movement distance in winter, using an allometric equation) accounted for at least 21% of total daily expenditure, the highest proportion reported for a mammal. During their nocturnal activity periods (winter vs. summer), swift foxes apparently traveled farther (ca. 13.0 vs. 5.7 km/night, using equal sampling intervals) and were active longer (ca. 12.9 vs. 11.3 h/night) in colder air. Nevertheless, FMR in winter (1488 kJ/d) was significantly lower than during summer (2079 kJ/d). We review available data for other free-living eutherians and show that low temperatures in winter are not necessarily associated with increases in FMR.

scholarly journals Evaluation of a portable device to measure daily energy expenditure in free-living adults

2007 ◽  
Vol 85 (3) ◽  
pp. 742-749 ◽  
Author(s):  
Maxime St-Onge ◽  
Diane Mignault ◽  
David B Allison ◽  
Rémi Rabasa-Lhoret
Keyword(s):  
Energy Expenditure ◽  
Portable Device ◽  
Daily Energy Expenditure ◽  
Free Living ◽  
Daily Energy
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