Publication: Long photoperiod impairs learning in male but not female medaka
Authors
López Olmeda, José Fernando ; Zhao, Haiyu ; Reischl, Markus ; Pylatiuk, Christian ; Lucon-Xiccato, Tyrone ; Loosli, Felix ; Foulkes, Nicholas Simon
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Publisher
Cell Press
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DOI
https://doi.org/10.1016/j.isci.2021.102784
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info:eu-repo/semantics/article
Description
© 2021 The Authors. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This document is the Published Manuscript version of a Published Work that appeared in final form in iScience. To access the final edited and published work see https://doi.org/10.1016/j.isci.2021.102784
Abstract
Day length in conjunction with seasonal cycles affects many aspects of animal
biology. We have studied photoperiod-dependent alterations of complex
behavior in the teleost, medaka (Oryzias latipes), a photoperiodic breeder, in a
learning paradigm whereby fish have to activate a sensor to obtain a food
reward. Medaka were tested under a long (14:10 LD) and short (10:14 LD) photoperiod in three different groups: mixed-sex, all-males, and all-females. Under long
photoperiod, medaka mixed-sex groups learned rapidly with a stable response.
Unexpectedly, males-only groups showed a strong learning deficit, whereas females-only groups performed efficiently. In mixed-sex groups, female individuals
drove group learning, whereas males apparently prioritized mating over feeding
behavior resulting in strongly reduced learning performance. Under short photoperiod, where medaka do not mate, male performance improved to a level similar
to that of females. Thus, photoperiod has sex-specific effects on the learning performance of a seasonal vertebrate.
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Citation
iScience, 2021, Vol. 24, Issue 7: 102784
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