Reply — Studies of beaver activity and body temperature: a historical perspective

1994 ◽  
Vol 72 (3) ◽  
pp. 572-574 ◽  
Author(s):  
Douglas W. Smith ◽  
Thomas D. Drummer ◽  
Rolf O. Peterson
Keyword(s):  
Body Temperature ◽  
Social Organization ◽  
Seasonal Changes ◽  
Historical Perspective ◽  
Castor Canadensis ◽  
Food Hoarding ◽  
Activity Rhythms ◽  
Hoarding Behavior

Bovet claims that Smith et al. (D.W. Smith, R.O. Peterson, T.D. Drummer, and D.S. Sheputis, 1991. Can. J. Zool. 69: 2178–2182) and Dyck and MacArthur (A.P. Dyck and R.A. MacArthur, 1992. Can. J. Zool. 70: 1668–1672) analyzed their data on activity and body temperature of beavers (Castor canadensis) incorrectly because they ignored the likelihood that northern beavers in winter have activity rhythms with periods >24 h. The analysis by Smith et al. was in fact appropriate for demonstrating seasonal changes in body temperature and its correlation with activity. These are important issues because researchers have obtained conflicting results and because seasonal changes in activity and body temperature have implications for colony energetics in the context of food-hoarding behavior and social organization.

Influence of food hoarding behavior on the over-winter survival of pikas in strongly seasonal environments

Oecologia ◽  
2008 ◽  
Vol 159 (1) ◽  
pp. 107-116 ◽  
Author(s):  
Shawn F. Morrison ◽  
Graeme Pelchat ◽  
Aaron Donahue ◽  
David S. Hik
Keyword(s):  
Winter Survival ◽  
Food Hoarding ◽  
Hoarding Behavior ◽  
Influence Of Food

scholarly journals Drosophila Temperature Preference Rhythms: An Innovative Model to Understand Body Temperature Rhythms

2019 ◽  
Vol 20 (8) ◽  
pp. 1988 ◽  
Author(s):  
Tadahiro Goda ◽  
Fumika N. Hamada
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
The Body ◽  
Metabolic Energy ◽  
Temperature Preference ◽  
Preferred Temperature ◽  
Activity Rhythms ◽  
Temperature Rhythm ◽  
Body Temperature Rhythm ◽  
Human Body Temperature

Human body temperature increases during wakefulness and decreases during sleep. The body temperature rhythm (BTR) is a robust output of the circadian clock and is fundamental for maintaining homeostasis, such as generating metabolic energy and sleep, as well as entraining peripheral clocks in mammals. However, the mechanisms that regulate BTR are largely unknown. Drosophila are ectotherms, and their body temperatures are close to ambient temperature; therefore, flies select a preferred environmental temperature to set their body temperature. We identified a novel circadian output, the temperature preference rhythm (TPR), in which the preferred temperature in flies increases during the day and decreases at night. TPR, thereby, produces a daily BTR. We found that fly TPR shares many features with mammalian BTR. We demonstrated that diuretic hormone 31 receptor (DH31R) mediates Drosophila TPR and that the closest mouse homolog of DH31R, calcitonin receptor (Calcr), is essential for mice BTR. Importantly, both TPR and BTR are regulated in a distinct manner from locomotor activity rhythms, and neither DH31R nor Calcr regulates locomotor activity rhythms. Our findings suggest that DH31R/Calcr is an ancient and specific mediator of BTR. Thus, understanding fly TPR will provide fundamental insights into the molecular and neural mechanisms that control BTR in mammals.

Seasonal patterns of body temperature and activity in free-ranging beaver (Castor canadensis)

1992 ◽  
Vol 70 (9) ◽  
pp. 1668-1672 ◽  
Author(s):  
Alvin P. Dyck ◽  
Robert A. MacArthur
Keyword(s):  
Body Temperature ◽  
Castor Canadensis ◽  
Age Groups ◽  
Open Water ◽  
Daily Rhythm ◽  
Mean Body Temperature ◽  
Temperature Changes ◽  
General Decline ◽  
Free Ranging ◽  
Immersion Hypothermia

Daily activity and body temperature patterns of beavers (Castor canadensis) were monitored in the field with an automated radiotelemetry system from June 1988 through March 1989. Body temperatures of kits and adults averaged close to 37 °C throughout the year, with no evidence of seasonal hypothermia. The greatest temperature changes accompanied episodes of aquatic activity. Body temperature typically dropped 1.0–1.5 °C during periods when beavers were absent from the lodge, then recovered when animals returned to the house. Throughout the open-water season (20 June – 1 November), both age groups demonstrated a daily rhythm in body temperature characterized by a gradual rise between 06:00 and 18:00 followed by a general decline during the nocturnal active period. During the ice-bound season (2 November – 15 March), there was little evidence of a distinct daily rhythm in activity or body temperature, especially in adults. Both age groups exhibited a 0.22–0.64 °C increase in mean body temperature during the 3-h period preceding the first trip in each sequence of excursions away from the lodge. We propose that this predeparture rise in temperature may contribute to the avoidance of immersion hypothermia in foraging beavers.

Food Hoarding Behavior in the Short-tailed Shrew Blarina brevicauda

1982 ◽  
Vol 108 (2) ◽  
pp. 369 ◽  
Author(s):  
Denise E. Robinson ◽  
Edmund D. Brodie
Keyword(s):  
Food Hoarding ◽  
Blarina Brevicauda ◽  
Hoarding Behavior

Neonatal thermal lesions of the mesolimbocortical dopaminergic projection decrease food-hoarding behavior

1988 ◽  
Vol 475 (1) ◽  
pp. 80-90 ◽  
Author(s):  
A. Kalsbeek ◽  
J.P.C. De Bruin ◽  
M.G.P. Feenstra ◽  
M.A.H. Matthijssen ◽  
H.B.M. Uylings
Keyword(s):  
Food Hoarding ◽  
Thermal Lesions ◽  
Hoarding Behavior
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