Título : The sensory effects of light on the electric organ discharge rate of Gymnotus omarorum
Autor(es) : Camargo, A.S.
Caputi, A.A.
Aguilera, P.A.
Fecha de publicación : 21-jun-2023
Tipo de publicación: Artículo
Versión: Publicado
Publicado por: The Company of Biologists Ltd
Publicado en: Journal of Experimental Biology
Areas del conocimiento : Ciencias Médicas y de la Salud
Medicina Básica
Neurociencias
Otros descriptores : Circadian cycle
High-frequency bouts
Tenebrotaxis
Resumen : Gymnotiformes are nocturnal fishes inhabiting the root mats of floating plants. They use their electric organ discharge (EOD) to explore the environment and to communicate. Here, we show and describe tonic and phasic sensory-electromotor responses to light distinct from indirect effects depending on the light-induced endogenous circadian rhythm. In the dark, principally during the night, inter-EOD interval histograms are bimodal: the main peak corresponds to the basal rate and a secondary peak corresponds to high-frequency bouts. Light causes a twofold tonic but opposing effect on the EOD histogram: (i) decreasing the main mode and (ii) blocking the high-frequency bouts and consequently increasing the main peak at the expense of removal of the secondary one. Additionally, light evokes phasic responses whose amplitude increases with intensity but whose slow time course and poor adaptation differentiate from the so-called novelty responses evoked by abrupt changes in sensory stimuli of other modalities. We confirmed that Gymnotus omarorum tends to escape from light, suggesting that these phasic responses are probably part of a global ‘light-avoidance response’. We interpret the data within an ecological context. Fish rest under the shade of aquatic plants during the day andlight spotsduetothesun’srelativemovementalertthefishtohide in shadyzonestoavoidmacropticpredators andfacilitate tracking the movement of floating plant islands by wind and/or water currents.
URI / Handle: https://hdl.handle.net/20.500.12381/3533
DOI: 10.1242/jeb.245489
Institución responsable del proyecto: Instituto de Investigaciones Biológicas Clemente Estable
Financiadores: Agencia Nacional de Investigación e Innovación
Identificador ANII: FCE_1_2019_1_155541
Nivel de Acceso: Acceso embargado
Fin del embargo: 2024-09-12
Licencia CC: Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional. (CC BY-NC-ND)
Aparece en las colecciones: Instituto de Investigaciones Biológicas Clemente Estable

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