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Behav Processes. 2017 May;138:49-57. doi: 10.1016/j.beproc.2017.02.015. Epub 2017 Feb 20.

Time place learning and activity profile under constant light and constant dark in zebrafish (Danio rerio).

Author information

1
Departamento de Fisiologia, Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil.
2
Departamento de Fisiologia, Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil. Electronic address: analuchiari@yahoo.com.br.

Abstract

The ability to learn about the signs of variability in space and time is known as time place learning (TPL). To adjust their circadian rhythms, animals use stimuli that change regularly, such as the light-dark cycle, temperature, food availability or even social stimuli. Because light-dark cycle is the most important environmental temporal cue, we asked how a diurnal animal would perform TPL if this cue was removed. Zebrafish has been extensively studied in the chronobiology area due to it diurnal chronotype, thus, we studied the effects of constant light and constant dark on the time-place learning and activity profile in zebrafish. Our data show that while under constant light and dark condition zebrafish was not able of TPL, after 30days under the constant conditions, constant light led to higher activity level and less significant (robust) 24h rhythm.

KEYWORDS:

Chronotype; Circadian rythym; Constant dark; Constant light; Time-place learning

PMID:
28219731
DOI:
10.1016/j.beproc.2017.02.015
[Indexed for MEDLINE]

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