Abstract:
:Locomotor activities in the goldfish Carassius auratus were recorded under light-dark (LD) and constant light regimens. Under LD 12:12, all goldfish adjusted to given LD cycles. Activity patterns were classified into three types: L-type activity during the photophase (83%), LD-type activity both during the photophase and the scotophase (10%), and D-type activity during the scotophase (7%). However, these patterns were not fixed, but flexible. Under constant conditions, goldfish exhibited circadian locomotor activities: The proportions of appearance of circadian rhythms and tau values under constant darkness (DD), constant light (LL, 500 lx) and constant dim light (dimLL, 20 lx) were 57% (24.4 +/- 1.6 h, [mean +/- SE], n = 34), 57% (25.2 +/- 2.5 h, n = 35) and 67% (26.0 +/- 3.4 h, n = 10), respectively. These results indicate that the goldfish exhibit flexibility in phasing of locomotor activity rhythms under LD 12:12. In addition, the coupling between circadian clocks and locomotor activities does not seem strong, although the diel locomotor activity in the goldfish is regulated, in part, by a circadian clock. These results are discussed in context with the structure of the teleostean circadian system.
journal_name
Physiol Behavjournal_title
Physiology & behaviorauthors
Iigo M,Tabata Mdoi
10.1016/0031-9384(96)00131-xsubject
Has Abstractpub_date
1996-09-01 00:00:00pages
775-81issue
3eissn
0031-9384issn
1873-507Xpii
0031-9384(96)00131-Xjournal_volume
60pub_type
杂志文章abstract::Both subjective and objectively measured social status has been associated with multiple health outcomes, including weight status, but the mechanism for this relationship remains unclear. Experimental studies may help identify the causal mechanisms underlying low social standing as a pathway for obesity. Our objective...
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journal_title:Physiology & behavior
pub_type: 杂志文章
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pub_type: 杂志文章
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