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  • Behavioral thermoregulation  (1)
  • Locomotor activity  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Complete suprachiasmatic lesions eliminate circadian rhythmicity of body temperature and locomotor activity in golden hamsters (1994)
    Springer
    Journal of comparative physiology 175 (1994), S. 223-232 
    Details
    ISSN: 1432-1351
    Keywords: Suprachiasmatic nucleus ; Circadian rhythms ; Body temperature ; Locomotor activity ; Syrian hamster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The effects of suprachiasmatic and control lesions on the circadian rhythms of locomotor activity and body temperature were studied in golden hamsters (Mesocricetus auratus) maintained in constant light as well as constant darkness. Large suprachiasmatic lesions, but not control lesions, eliminated circadian rhythmicity in locomotor activity as well as in body temperature. Analysis of the “robustness” of the rhythms of locomotor activity and body temperature in unlesioned and lesioned animals suggests that, because body temperature rhythmicity is more robust than locomotor rhythmicity, lesions that spare a small number of suprachiasmatic cells might abolish the latter but not the former. Our results do not support the hypothesis that the body temperature rhythm is controlled by a circadian pacemaker distinct from the main pacemaker located in the suprachiasmatic nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215118
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  • 2
    Electronic Resource
    Electronic Resource
    The pineal complex and melatonin affect the expression of the daily rhythm of behavioral thermoregulation in the green iguana (1996)
    Springer
    Journal of comparative physiology 179 (1996), S. 135-142 
    Details
    ISSN: 1432-1351
    Keywords: Daily rhythms ; Iguana iguana ; Behavioral thermoregulation ; Parietal eye ; Pineal gland ; Melatonin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Daily variation in the body temperature of the green iguana (Iguana iguana) was studied by telemetry in laboratory photo-thermal enclosures under a 12Light∶12Dark (L∶D) photoperiod. The lizards showed robust daily rhythms of thermoregulation maintaining their body temperatures (Tb) at higher levels during the day than during the night. Some animals maintained rhythmicity when kept in constant darkness. On light∶dark cycles parietalectomy produced only a transient increase of median Tb in the first or second night following the operation. Pinealectomized lizards on the other hand maintained their body temperatures at significantly lower levels during the day and at significantly higher levels during the night than did sham-operated or intact lizards. This effect was apparently permanent, since one month after pinealectomy lizards still displayed the altered pattern. Plasma melatonin levels in intact animals were high during the night and low during the day and were unaffected by parietalectomy. Pinealectomized lizards showed low levels of plasma melatonin during both the day and the night. A daily intraperitoneal injection of melatonin in pinealectomized animals given a few minutes after the light to dark transition decreased the body temperatures selected by the lizards during the night and increased the body temperatures selected during the following day. Control injections of saline solution had no effect. The significance of these results is discussed in relation to the role of the pineal complex and melatonin in the mediation of thermoregulatory behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00193441
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    Paper (German National Licenses)
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