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| Titel: |
Daily and seasonal rhythms of locomotor activity and adrenal function in male hedgehogs(Erinaceus europaeus L.) |
| Auteur: |
Saboureau, Michel Laurent, Gerard Boissin, Jean |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 10 (1979) nr. 4 pagina's 249-266 |
| Jaar: |
1979-12 |
| Inhoud: |
Male hedgehogs were maintained in outdoor parks, under natural climatic conditions. The general locomotor activity was recorded over one year in five hedgehogs, using an infra-red producer-receptor system registering entering or leaving the nest box in relation to time. Simultaneously, thecortico-adrenal activity was studied monthly by sampling without disturbing, at 4 h intervals over a period of 24 h, in groups of 6 animals with a catheter inserted in the left carotid artery. The corticosteroids were assayed using a competitive protein binding technique. In our study, hedgehogs living in Western Central France showed: (1) from February-March to August-September a daily nocturnal locomotor activity well synchronized with sunset and sunrise, (2) between August-September and February-March an alternation of resting and activity periods which constitute the hibernating period. The activity periods occur still during the night, but there are no relationships with sunset or sunrise, (3) from February to October, a nycthemeral rhythm of plasma corticosteroids wi th an evening maximum and a morning minimum, as in laboratory animals with nocturnal locomotor activity, (4) after October, during hibernation, significant variations of plasma corticos teroids with an irregular.pattern (shifting of the maximum or biphasic profile), (5) a clearly annual cycle of the daily plasma corticosteroids levels, with a considerable increase in autumn (maximum in December), a significant decrease in January and a minimum from January to May. These daily and seasonal variations of locomotor activity and cortico-adrenal activity are related to the seasonal variations of the environment. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 5 gevonden artikelen
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