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| Titel: |
Circadian rhythms (activity, temperature, urine and microfilariae) in dog, cat, hen, duck, thamnomys and gerbillus |
| Auteur: |
Hawking, F. Lobban, Mary C. Gammage, K. Worms, M. J. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 2 (1971) nr. 4 pagina's 455-473 |
| Jaar: |
1971-12 |
| Inhoud: |
Circadian rhythms (activity, temperature, urine and microfilariae) were investigated in dogs, cat, hen, duck, Thamnomys, and Gerbillus. They differed greatly among themselves and also from those of Macaca monkeys or man. In dogs and cats (hunting animals) activity was not organized according to the light/dark cycle but it occurred in irregular bouts lasting up to 4-6 hrs at all times of the day and night. The temperature (in a cat) was similarly irregular, going up in peaks lasting an hour but not clearly associated with light/dark. (This is in great contrast to the rhythms of monkeys and man which are closely associated with light). Recordings of urinary excretion in dogs showed daily rhythms of low amplitude with a tendency for higher excretory rates to occur during the normal period of darkness. The microfilariae of Dirofilaria immitis in the dogs showed only a moderately defined cycle and this was not significantly affected by continuous darkness or continuous light. The hen showed well marked cycles of activity and body temperature, which were high by day and low by night. These resemble the cycles of monkeys and man. The duck showed no clear cycles and its activity or body temperature, although both tended to be higher by day than by night. Thamnomys surdaster (the Congo tree rat) and Gerbillus showed good cycles of activity which were high by night and low by day. These were as well defined as those of monkeys, only the phases were reversed. The differing circadian rhythms of the different hosts are clearly important for the study of the cycles of parasites (microfilariae, plasmodia, etc.) which they may harbour. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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