Effects of dark-light step transitions on circadian locomotor activity rhythms of the hagfish,Eptatretus burgeri |
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Authors: | Hiroshi Kabasawa |
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Institution: | (1) Keikyu Auratsubo Marine Park Aquarium, 1082 Koajiro, Miura-shi, 238-0225 Kanagawa, Japan |
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Abstract: | Captive hagfish,Eptatretus burgeri, were subjected to step transitions from continuous dark (DD) to continuous light (LL) and their locomotor activity patterns
recorded. Free-running activity rhythms occurred in both the DD and LL regimes. The timing of the transition influenced the
circadian period (τ), the relationship between the period response (δτ, or τ{inLL}–τ{inDD}, change in the circadian period)
and the former being represented by a cosine curve δτ became most positive and most negative when hagfish underwent a DD-LL
transition shortly before the beginning of the duration of activity (α) and shortly after the end of such, respectively. The
phase response (δ-phase, change in the relative timing of the activity phase) was characterized by a delay in the activity
phase after the DD-LL transition, although its magnitude bore no relation to the timing of the transition. |
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Keywords: | Circadian rhythm locomotor activity hagfish |
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