Publication:
Influence of light intensity on plasma melatonin and locomotor activity rhythms in tench

Simple item page
dc.contributor.authorVera, L.M.
dc.contributor.authorLópez Olmeda, J.F.
dc.contributor.authorBayarri, M.J.
dc.contributor.authorMadrid, J.A.
dc.contributor.authorSánchez Vázquez, F.J.
dc.contributor.departmentFisiología
dc.date.accessioned2024-01-11T12:11:56Z
dc.date.available2024-01-11T12:11:56Z
dc.date.issued2005
dc.description©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.es
dc.description.abstractMelatonin 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)es
dc.formatapplication/pdfes
dc.format.extent24es
dc.identifier.citationChronobiology International
dc.identifier.urihttp://hdl.handle.net/10201/137185
dc.languageenges
dc.relationSin financiación externa a la Universidades
dc.rightsinfo:eu-repo/semantics/openAccesses
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectTinca tincaes
dc.subjectLight intensityes
dc.subjectMelatonines
dc.subjectLocomotor activityes
dc.subjectLight pulsees
dc.titleInfluence of light intensity on plasma melatonin and locomotor activity rhythms in tenches
dc.typeinfo:eu-repo/semantics/articlees
dspace.entity.typePublicationes
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
INFLUENCE OF LIGHT INTENSITY ON PLASMA MELATONIN AND LOCOMOTOR ACTIVITY RHYTHMS IN TENCH.pdf
Size:
552.6 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
2.26 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Artículos