Body Temperature of the Old-Field Mouse (Peromyscus polionotus) in and Below the Thermoneutral Zone Nest-Building in Dipodomys merrlami at Different Ambient Temperatures

1973 ◽  
Vol 54 (4) ◽  
pp. 996-997 ◽  
Author(s):  
D. W. Kaufman ◽  
G. A. Kaufman
Keyword(s):  
Body Temperature ◽  
Nest Building ◽  
Field Mouse ◽  
Old Field ◽  
Peromyscus Polionotus ◽  
Ambient Temperatures ◽  
Thermoneutral Zone

The metabolic rate and thermal conductance of the eastern barred bandicoot (Perameles gunnii) at different ambient temperatures

2003 ◽  
Vol 51 (6) ◽  
pp. 603 ◽  
Author(s):  
M. P. Ikonomopoulou ◽  
R. W. Rose
Keyword(s):  
Oxygen Consumption ◽  
Body Temperature ◽  
Metabolic Rate ◽  
Thermal Conductance ◽  
The Body ◽  
High Metabolic Rate ◽  
Ambient Temperatures ◽  
Reduced Body ◽  
Thermoneutral Zone ◽  
Reproductive Females

We investigated the metabolic rate, thermoneutral zone and thermal conductance of the eastern barred bandicoot in Tasmania. Five adult eastern barred bandicoots (two males, three non-reproductive females) were tested at temperatures of 3, 10, 15, 20, 25, 30, 35 and 40°C. The thermoneutral zone was calculated from oxygen consumption and body temperature, measured during the daytime: their normal resting phase. It was found that the thermoneutral zone lies between 25°C and 30°C, with a minimum metabolic rate of 0.51 mL g–1 h–1 and body temperature of 35.8°C. At cooler ambient temperatures (3–20°C) the body temperature decreased to approximately 34.0°C while the metabolic rate increased from 0.7 to 1.3 mL g–1�h–1. At high temperatures (35°C and 40°C) both body temperature (36.9–38.7°C) and metabolic rate (1.0–1.5 mL g–1 h–1) rose. Thermal conductance was low below an ambient temperature of 30°C but increased significantly at higher temperatures. The low thermal conductance (due, in part, to good insulation, a reduced body temperature at lower ambient temperatures, combined with a relatively high metabolic rate) suggests that this species is well adapted to cooler environments but it could not thermoregulate easily at temperatures above 30°C.

Body Composition of the Old-Field Mouse (Peromyscus polionotus)

1977 ◽  
Vol 58 (3) ◽  
pp. 429-434 ◽  
Author(s):  
G. A. Kaufman ◽  
D. W. Kaufman
Keyword(s):  
Body Composition ◽  
Field Mouse ◽  
Old Field ◽  
Peromyscus Polionotus

Thermoneutral zone of chickens as determined by measuring heat production, respiration rate, and electromyographic and electroencephalographic activity in light and dark environments and changing ambient temperatures

1979 ◽  
Vol 92 (1) ◽  
pp. 219-226 ◽  
Author(s):  
M. Van Kampen ◽  
B. W. Mitchell ◽  
H. S. Siegel
Keyword(s):  
Body Temperature ◽  
Respiration Rate ◽  
Heat Production ◽  
Low Frequency ◽  
Light Period ◽  
Emg Activity ◽  
Eeg Activity ◽  
Ambient Temperatures ◽  
Thermoneutral Zone ◽  
Significant Difference

SummaryElectromyographic (EMG) activity, electroencephalographic (EEG) activity, heat production (H), respiration rate (RR), and body temperature (TB) of unacclimatized chickens were measured during periods of light and darkness at ambient temperatures (Ta) between 7·7 and 37·7 °C. The difference between pectoral muscle and abdomen temperature was less than 0·1 °C over the entire temperature range. Body temperature increased (P ≤ O·l) when Ta was above 27·5 °C and was higher in the light than in the dark (P ≤ 0·05). Respiration rate decreased significantly with increasing Ta. The decrease, however, was not as great during the dark (P ≤ 0·05) as during the light period (P s£ 001). Heat production decreased (P ≤ 0·01) with increasing Ta up to Ta = 22·3 °C. There was no significant difference between heat production during the light period and that during the dark period. EMG amplitude declined (P ≤ 0·01) with increasing Ta up to 27·5 °C in the light and 22·3 °C in the dark and was higher (P ≤ 0·05) in the light than in the dark. Mean frequency of EMG activity was independent of light and Ta. The percentage of low-frequency EEG activity in the dark did not change significantly over the entire Ta range, but in the light it decreased as Ta increased above 25·7 °C (P ≤ 0·05). The percentage of high-frequency EEG activity appeared as a mirror image of low-frequency activity. Overall results indicated a thermoneutral zone between 32·2 and 37·7 °C in the light and between 27·5 and 37·7 °C in the dark.

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