Wheel-running and rest activity pattern interaction in two octodontids (Octodon degus, Octodon bridgesi)
Biol. Res
;
38(2/3): 299-305, 2005. ilus
Artículo
en Inglés
| LILACS
| ID: lil-424733
ABSTRACT
Wheel-running and other non-photic stimuli influence the rest-activity pattern of diurnal and nocturnal mammals. A day to night inversion of phase preference of activity was described among Octodon degus, when exposed to ad-libitum wheel running. We have studied the rest-activity pattern response in presence of ad libitum wheel-running in wild-captured male individuals from two species of genus Octodon O. degus (n=9, crepuscular-diurnal) and O. bridgesi (n=3, nocturnal). After two months of habituation to laboratory conditions, recordings were performed in isolation chambers under a 1212 light-dark schedule with or without access to a running wheel. Actograms were constructed from data obtained by an automated acquisition system. O. bridgesi were also recorded under constant darkness, with or without access to wheel-running. Entrained to the light-dark schedule, a crepuscular pattern of activity was evident for O. degus, whereas O. bridgesi displayed a robust nocturnal chronotype. The activity of O. degus observed during the dark phase was enhanced when wheel-running was allowed. No significant change in phase preference was observed for O. bridgesi when wheel-running was allowed. A lengthening of endogenous period was observed in O. bridgesi after wheel-running exposure under constant darkness. Nocturnal and diurnal octodontids exhibit different masking responses to wheel-running.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Adaptación Ocular
/
Ritmo Circadiano
/
Adaptación a la Oscuridad
Límite:
Animales
Idioma:
Inglés
Revista:
Biol. Res
Asunto de la revista:
Biologia
Año:
2005
Tipo del documento:
Artículo
/
Documento de proyecto
País de afiliación:
Chile
Institución/País de afiliación:
Universidad de Chile/CL
/
Universidad de Valpara¡so/CL
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