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Título: | Influence of light intensity on plasma melatonin and locomotor activity rhythms in tench |
Fecha de publicación: | 2005 |
Cita bibliográfica: | Chronobiology International |
Palabras clave: | Tinca tinca Light intensity Melatonin Locomotor activity Light pulse |
Resumen: | Melatonin production by the pineal organ is influenced by light intensity, as has been described in most vertebrate species, in which melatonin is considered a synchronizer of circadian rhythms. In the case of tench, strict nocturnal activity rhythms have been described although the role of melatonin has not been clarified. In this study we investigated daily activity and melatonin rhythms under 12:12 light-dark (LD) conditions with two different light intensities (58.6 and 1091µW/cm2 ), and the effect of one hour broad spectrum white light pulses of different intensities (3.3, 5.3, 10.5, 1091.4 µW/cm2 ) applied at mid darkness (MD) on nocturnal circulating melatonin. The results showed that plasma melatonin in tench under LD 12:12 and high light conditions displayed a rhythmic variation, where values at MD (255.8 ± 65.9 pg/ml) were higher than at mid light (ML) (70.7 ± 31.9 pg/ml). Such a difference between MD and ML values was reduced in animals exposed to LD 12:12 and low light intensity. The application of one hour light pulses at MD lowered plasma melatonin to 111.6 ± 3.2 pg/ml (in the 3.3-10.5 µW/cm2 range) and to 61.8 ± 18.3 pg/ml (with the 1091.4 µW/cm2 light pulse) and totally suppressed nocturnal locomotor activity. These results showed that melatonin rhythms persisted in tench exposed to low light intensity although the amplitude of the rhythm is affected. In addition, it was observed that light pulses applied at MD affected plasma melatonin content and locomotor activity. Such a low threshold suggests that the melatonin system is capable of transducing light even under dim conditions, which may be used by this nocturnal fish to synchronize to weak night light signals (e.g. moonlight cycles) |
Autor/es principal/es: | Vera, L.M. López Olmeda, J.F. Bayarri, M.J. Madrid, J.A. Sánchez Vázquez, F.J. |
Facultad/Departamentos/Servicios: | Facultades, Departamentos, Servicios y Escuelas::Departamentos de la UMU::Fisiología |
URI: | http://hdl.handle.net/10201/137185 |
Tipo de documento: | info:eu-repo/semantics/article |
Número páginas / Extensión: | 24 |
Derechos: | info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional |
Descripción: | ©2005. 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 Accepted version of a Published Work that appeared in final form in Chronobiology International: The Journal of Biological and Medical Rhythm Research. |
Aparece en las colecciones: | Artículos: Fisiología |
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Fichero | Descripción | Tamaño | Formato | |
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INFLUENCE OF LIGHT INTENSITY ON PLASMA MELATONIN AND LOCOMOTOR ACTIVITY RHYTHMS IN TENCH.pdf | 552,6 kB | Adobe PDF | Visualizar/Abrir |
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