Data/hora: 02/06/2024 05:22:52

Provedor de dados: 	48	
País: 	Chile	
Título: 	Wheel-running and rest activity pattern interaction in two octodontids (Octodon degus, Octodon bridgesi)	
Autores: 	OCAMPO-GARCÉS,ADRIÁN; HERNÁNDEZ,FELIPE; MENA,WILSON; PALACIOS,ADRIÁN G.	
Data: 	2005-01-01	
Ano: 	2005	
Palavras-chave: 	Circadian rhythms; Masking; Octodon degus; Octodon bridgesi; Wheel-running.	
Resumo: 	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 12:12 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.	
Tipo: 	Journal article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000200019	
Editor: 	Sociedad de Biología de Chile	
Formato: 	text/html	
Fonte: 	Biological Research  v.38 n.2-3 2005