Entrainment of the circadian rhythm of food demand by infradian cycles of light-dark alternation in

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Contributeur(s) EDP Sciences
Identifiant documentaire 10-1991023
Identifiant OAI oai:edpsciences.org:dkey/10.1051/alr:1991023
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Auteur(s): Thierry Boujard,Yann Moreau,Pierre Luquet
Mots clés Siluriform diel cycle feeding rhythms Siluriforme rythmes circadiens cycles nycthéméraux alimentation
Date de publication 15/10/1991
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Source https://doi.org/10.1051/alr:1991023
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Hoplosterum littorale (Hancock, 1828) shows a marked circadian rhythm of food demand. Feeding activity is mainly nocturnal, with two peaks, and is synchronized with the diel light cycle. We tested the effect of infradian (period >28 h) light/dark cycles on this rhythm in fish with demand-feeders: fish subjected to a 13.5 L/22.5 D light/dark cycle for 8 days and a 25.5 L/10.5 D cycle for a further 8 days showed a strictly nocturnal feeding activity, a response that only passively reflected the cyclic alternation of light and dark.
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