Juvenile Siberian Hamsters Display Torpor and Modified Locomotor Activity and Body Temperature Rhythms in Response to Reduced Food Availability

2003 ◽  
Vol 76 (6) ◽  
pp. 858-867 ◽  
Author(s):  
Helen H. Bae ◽  
Jennie E. Larkin ◽  
Irving Zucker
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
Food Availability ◽  
Siberian Hamsters ◽  
Temperature Rhythms

scholarly journals Circadian Disruption Alters the Effects of Lipopolysaccharide Treatment on Circadian and Ultradian Locomotor Activity and Body Temperature Rhythms of Female Siberian Hamsters

2015 ◽  
Vol 30 (6) ◽  
pp. 543-556 ◽  
Author(s):  
Brian J. Prendergast ◽  
Erin J. Cable ◽  
Tyler J. Stevenson ◽  
Kenneth G. Onishi ◽  
Irving Zucker ◽  
...  
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
Circadian Disruption ◽  
Siberian Hamsters ◽  
Temperature Rhythms

Circadian locomotor activity and core-body temperature rhythms in Alzheimer's disease

1995 ◽  
Vol 16 (5) ◽  
pp. 765-771 ◽  
Author(s):  
Andrew Satlin ◽  
Ladislav Volicer ◽  
Edward G. Stopa ◽  
David Harper
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Locomotor Activity ◽  
Body Temperature ◽  
Core Body Temperature ◽  
Temperature Rhythms ◽  
Core Body

Suprachiasmatic nuclei influence torpor and circadian temperature rhythms in hamsters

1989 ◽  
Vol 257 (1) ◽  
pp. R210-R215 ◽  
Author(s):  
N. F. Ruby ◽  
N. Ibuka ◽  
B. M. Barnes ◽  
I. Zucker
Keyword(s):  
Locomotor Activity ◽  
Power Spectral Analysis ◽  
Secretory Activity ◽  
Suprachiasmatic Nuclei ◽  
Activity Rhythms ◽  
Siberian Hamsters ◽  
Power Spectral ◽  
Temperature Rhythms ◽  
Bilateral Lesions ◽  
Torpor Bouts

Siberian hamsters were maintained in a short-day photoperiod (8 h light-day) at 15 degrees C; body temperature (Tb) and locomotor activity were telemetrically recorded at 10-min intervals over the course of 5 mo. Animals manifesting repeated torpor bouts (Tb less than 30 degrees C for several hours) were subjected to lesions of the suprachiasmatic nuclei (SCN), pinealectomy, or sham operations. In the 15 wk after surgery, none of the animals with bilateral lesions of the SCN exhibited torpor; circadian Tb and locomotor activity rhythms, as determined by cosinor and power spectral analysis, also were absent in SCN-lesioned hamsters. Pinealectomized animals and brain-lesioned hamsters with intact SCN had normal circadian temperature and activity rhythms and showed torpor for at least 4 wk postsurgically. Expression of torpor and circadian rhythms of Tb and activity are dependent on intact SCN and persist for several weeks in the absence of pineal secretory activity.

scholarly journals Effects of food intake and hydration state on behavioral thermoregulation and locomotor activity in the tropidurid lizard Tropidurus catalanensis

2021 ◽  
Vol 224 (6) ◽  
pp. jeb242199
Author(s):  
Dylan J. Padilla Perez ◽  
Jose E. de Carvalho ◽  
Carlos A. Navas
Keyword(s):  
Locomotor Activity ◽  
Food Intake ◽  
Body Temperature ◽  
Food Consumption ◽  
Food Availability ◽  
Theoretical Models ◽  
Behavioral Thermoregulation ◽  
Preferred Temperature ◽  
Total Distance ◽  
Hydration State

ABSTRACT Theoretical models predict that lizards adjust their body temperature through behavioral thermoregulation as a function of food availability. However, behavioral thermoregulation is also governed by interactions among physiological and ecological factors other than food availability, such as hydration state, and sometimes it can even conflict with the locomotor activity of animals. Here, we aimed to investigate the role of food intake and hydration state on behavioral thermoregulation and voluntary locomotor activity in the lizard Tropidurus catalanensis. We hypothesized that food intake can influence behavioral thermoregulation via an interaction with hydration state. We also hypothesized that lizards should endeavor to spend as little time as possible to reach their preferred body temperature to defend other physiological and/or ecological functions. We collected lizards in the field and brought them to the laboratory to measure the preferred temperature selected in a thermal gradient and the total distance traveled by them in fed and unfed conditions and with variable hydration state. Our results showed that food consumption was the most important predictor of preferred temperature. In contrast, either the hydration state alone or its interaction with food consumption did not have important effects on the lizards’ thermal preference. Also, we found that the total distance traveled by lizards was not affected by food intake and was barely affected by the hydration state. We provide an experimental approach and a robust analysis of the factors that influence behavioral thermoregulation and locomotor activity in a tropical lizard.

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