Circadian locomotor activity rhythms of the burbot,Lota lota: Seasonal differences in period length and the effect of pinealectomy
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The burbot,Lota lota, displayed a freerunning circadian locomotor activity rhythm under constant darkness. There was a seasonal change in the length of the circadian period (τ). Fish captured during winter had a meanτ of 21.2±0.30 h as opposed to aτ of 23.5±0.25 in summer. Removal of the pineal organ had significant effects on the length and stability of the circadian period. Furthermore, the pineal influences on period length varied with season (Fig. 4). In winter,τ was significantly lengthened (22.1±0.30 h to 23.4±0.50 h) while in summer,τ was significantly shortened (23.5±0.25 h to 21.9±0.50 h).
KeywordsLocomotor Activity Seasonal Change Seasonal Difference Activity Rhythm Period Length
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- Eriksson, L.O.: Spring inversion of the diel rhythm of locomotor activity in young sea-going brown trout,Salmo trutta trutta L. and atlantic salmon,Salmo salar L. Aquilo Ser. Zool.14 68–79 (1973)Google Scholar
- Eriksson, L.O.: Nocturnalism versus diurnalism; Dualism within fish individuals. In: Rhythmic activity of fishes. Thorpe, J.E. (ed.), pp. 69–90. New York: Academic Press 1978Google Scholar
- Gwinner, E.: Effects of pinealectomy on circadian locomotor activity rhythms in European starlings,Sturnus vulgaris. J. Comp. Physiol.126, 123–129 (1978)Google Scholar
- Kavaliers, M.: Seasonal changes in the circadian activity period of lake chub,Couesius plumbeus. Can. J. Zool.56, 2591–2596 (1978)Google Scholar
- Kavaliers, M.: Pineal involvement in the control of circadian rhythmicity in the lake chub,Couesius plumbeus. J. Exp. Zool.209, 33–40 (1979)Google Scholar
- Müller, K.: The flexibility of the circadian system of fish at different latitudes. In: Rhythmic activity of fishes. Thorpe, J.E. (ed.), pp. 91–104. New York: Academic Press 1978Google Scholar
- Pittendrigh, C.S.: Circadian oscillations in cells and the circadian organization of multicellular systems. In: The neurosciences: Third study program. Schmitt, F.O., Worden, F.G. (eds.), pp. 437–458. Cambridge, Mass.: MIT Press 1974Google Scholar
- Pittendrigh, C.S., Daan, S.: A functional analysis of circadian pacemakers in nocturnal rodents. 1. The stability and lability of spontaneous frequency.. J. Comp. Physiol.106, 223–252 (1976)Google Scholar