Effects of dark-light step transitions on circadian locomotor activity rhythms of the hagfish,Eptatretus burgeri

Autor:	Hiroshi Kabasawa
Rok vydání:	1998
Předmět:	medicine.medical_specialty Cosine curve biology Period (gene) Activity rhythms Anatomy biology.organism_classification Locomotor activity Rhythm Endocrinology Internal medicine biology.animal medicine Eptatretus burgeri Circadian rhythm Ecology Evolution Behavior and Systematics Hagfish
Zdroj:	Ichthyological Research. 45:235-239
ISSN:	1616-3915 1341-8998
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f2a6744e6cec557c827a4ccd6b5127f0 https://doi.org/10.1007/bf02673921 Zobrazit plný text záznamu Full text from SpringerLink