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  • 1
    Electronic Resource
    Electronic Resource
    Seasonal changes of locomotor activity patterns in ruin lizards Podarcis sicula (1994)
    Springer
    Behavioral ecology and sociobiology 34 (1994), S. 267-274 
    Details
    ISSN: 1432-0762
    Keywords: Circadian rhythms ; Locomotor activity ; Seasonality ; Lizards
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The daily pattern of locomotor activity of the ruin lizard Podarcis sicula in its natural environment changes from unimodal in spring (with only one activity peak per day) to bimodal in summer (with two well-separated activity peaks per day) and it becomes unimodal again in autumn. In order to establish whether such seasonal changes in pattern might be at least in part controlled by endogenous temporal programs, lizards were collected at different times of the year and immediately after capture their locomotor behavior was tested in the laboratory under constant temperature (29°C) and in darkness. For some individuals tested in the laboratory the locomotor pattern previously expressed in the field was known. Seasonal differences in pattern have been unequivocally found to have an endogenous component, as most lizards in constant conditions retained the locomotor pattern shown in the field during the same season. Besides, in the bimodal lizards the freerunning period of locomotor rhythms (τ) was significantly shorter and circadian activity time (a) longer than in the unimodal ones. Altogether the data are compatible with the idea that both the interdependent changes of τ and a and the changes in locomotor pattern occurring seasonally in the circadian activity rhythms of P. sicula would depend on changes in the phase relationship between mutually coupled oscillators which drive these rhythms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00183477
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Seasonal changes of locomotor activity patterns in ruin lizards Podarcis sicula (1994)
    Springer
    Behavioral ecology and sociobiology 35 (1994), S. 27-32 
    Details
    ISSN: 1432-0762
    Keywords: Circadian rhythms ; Locomotor activity ; Pinealectomy ; Seasonality ; Lizards
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seasonal differences in the locomotor activity pattern of Podarcis sicula held in constant conditions in the laboratory were found to be associated with systematic differences in both the freerunning period of locomotor rhythms (τ) and the circadian activity time (α). In order to establish whether the pineal played a role in the control of seasonal changes in circadian parameters, we examined the effects of pinealectomy in constant conditions on the locomotor behavior of lizards displaying the bimodal activity pattern typical of summer. In most lizards pinealectomy lengthened τ, shortened α and abolished the bimodal activity pattern. Pinealectomy induced a sudden transition from the typical locomotor behavior of summer, characterized by a marked bimodal pattern, short τ and long α, to the typical locomotor behavior of autumn, characterized by a unimodal pattern, a long τ and short α. These results demonstrate that the pineal plays a central role in the seasonal reorganization of the circadian system that occurs in P. sicula.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00167056
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Seasonal changes of locomotor activity patterns in ruin lizards Podarcis sicula (1994)
    Springer
    Behavioral ecology and sociobiology 34 (1994), S. 267-274 
    Details
    ISSN: 1432-0762
    Keywords: Key words: Circadian rhythms ; Locomotor activity ; Seasonality ; Lizards
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The daily pattern of locomotor activity of the ruin lizard Podarcis sicula in its natural environment changes from unimodal in spring (with only one activity peak per day) to bimodal in summer (with two well-separated activity peaks per day) and it becomes unimodal again in autumn. In order to establish whether such seasonal changes in pattern might be at least in part controlled by endogenous temporal programs, lizards were collected at different times of the year and immediately after capture their locomotor behavior was tested in the laboratory under constant temperature (29°C) and in darkness. For some individuals tested in the laboratory the locomotor pattern previously expressed in the field was known. Seasonal differences in pattern have been unequivocally found to have an endogenous component, as most lizards in constant conditions retained the locomotor pattern shown in the field during the same season. Besides, in the bimodal lizards the freerunning period of locomotor rhythms (τ) was significantly shorter and circadian activity time (α) longer than in the unimodal ones. Altogether the data are compatible with the idea that both the interdependent changes of τ and α and the changes in locomotor pattern occurring seasonally in the circadian activity rhythms of P. sicula would depend on changes in the phase relationship between mutually coupled oscillators which drive these rhythms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002650050042
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Seasonal changes of locomotor activity patterns in ruin lizards Podarcis sicula (1994)
    Springer
    Behavioral ecology and sociobiology 35 (1994), S. 27-32 
    Details
    ISSN: 1432-0762
    Keywords: Key words Circadian rhythms ; Locomotor activity ; Pinealectomy ; Seasonality ; Lizards
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seasonal differences in the locomotor activity pattern of Podarcis sicula held in constant conditions in the laboratory were found to be associated with systematic differences in both the freerunning period of locomotor rhythms (τ) and the circadian activity time (α). In order to establish whether the pineal played a role in the control of seasonal changes in circadian parameters, we examined the effects of pinealectomy in constant conditions on the locomotor behavior of lizards displaying the bimodal activity pattern typical of summer. In most lizards pinealectomy lengthened τ, shortened α and abolished the bimodal activity pattern. Pinealectomy induced a sudden transition from the typical locomotor behavior of summer, characterized by a marked bimodal pattern, short τ and long α, to the typical locomotor behavior of autumn, characterized by a unimodal pattern, a long τ and short α. These results demonstrate that the pineal plays a central role in the seasonal reorganization of the circadian system that occurs in P. sicula.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00167056
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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