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| Titel: |
Internal coupling of five functions of rabbits exhibiting a bimodal circadian rhythm |
| Auteur: |
Jilge, Burghart Friess, Lorenz Stahle, Herbert |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 17 (1986) nr. 1 pagina's 7-28 |
| Jaar: |
1986-05 |
| Inhoud: |
By means of a microcomputer-assisted, electronic recording system five physiological, circadian rhythms of the rabbit were monitored: locomotor activity, hard faeces excretion, food intake, urine excretion and water intake. During 120 days of continuous light conditions (30 lx) the animals exhibited a free-running circadian rhythm. After the fading out of aftereffects of the preceding light: dark schedule on day 51 ± 11 the animals ran free with an individually distinct period length of > 24.0 h (τ: 24.48 ± 0.10 (SD) h). Spectral analysis of coherent data of 50-84 days showed that in addition to the circadian period persistent ultradian periods of 6.1, 8.2 and 12.3 h were present. Within each individual the five functions proved to be tightly coupled during the free-run, during the time of reentrainment and when entrained with the LD 12:12. While during LD 12:12 the animals exhibited a bimodal rhythm, during the free-run the rhythm was unimodal in all five functions. In one animal a “splitting”; of the free-running period occurred. Both components ran free with different period length. They fused again after 38 days. The “splitting”; was reflected in all five functions of this animal. The behavioural characteristics of meal duration and -frequency, duration of activity and -intervals, of water intake and urination did not show significant differences during the conditions of LD 12:12 and LL. The results support Pittendrigh's model of two systems of oscillators, selectively susceptible to the transitions of dark : light and light : dark. Our results suggest that in the rabbit the five functions are governed in common by both oscillator-systems. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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