Long photoperiod impairs learning in male but not female medaka.
iScience
; 24(7): 102784, 2021 Jul 23.
Article
em En
| MEDLINE
| ID: mdl-34308290
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 (1410 LD) and short (1014 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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Base de dados:
MEDLINE
Idioma:
En
Revista:
IScience
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Alemanha