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| Titel: |
Circadian oviposition rhythm and locomotor activity in the medaka, Oryzias latipes |
| Auteur: |
Ueda, M. Oishi, T. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 13 (1982) nr. 2 pagina's 97-104 |
| Jaar: |
1982-05 |
| Inhoud: |
The time of oviposition and the locomotor activity rhythm of pairs of male and female medaka, Oryzias latipes, under LD 16:8 and continuous light were investigated. The fish layed eggs just before or after the onset of light periods in LD 16:8 and the time of oviposition gradually delayed every day when the fish were transferred from LD 16:8 to continuous light. Thus, the oviposition rhythm is clearly entrained by light-dark cycles and it shows a circadian rhythm in continuous light. Phase-angle differences of the oviposition rhythm were compared between two different intensities (0 and 5 lx) during dark periods to examine the masking effect of complete darkness, but there was no statistically significant difference. Four types of the locomotor activity rhythm were observed under LD 16:8; diurnal, nocturnal, light-change active and arrhythmic. It seems to depend on the light intensity during dark periods whether the fish show diurnal or nocturnal behaviour. Only one out of 19 pairs showed a freerunning circadian rhythm when the fish were transferred from LD 16:8 to continuous light. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 1 van 8 gevonden artikelen
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