Publication: Differential light intensity and spectral sensitivities of atlantic salmon, european sea bass and atlantic cod pineal
glands ex vivo
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Date
2010
Authors
Vera, L.M. ; Davie, A. ; Taylor, J.F. ; Migaud, H.
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Publisher
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DOI
https://doi.org/10.1016/j.ygcen.2009.05.021
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info:eu-repo/semantics/article
Description
©2010. 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 General and Comparative Endocrinology. To access the final edited and published work see https://doi.org/10.1016/j.ygcen.2009.05.021
Abstract
Photoperiod is perceived by pineal photoreceptors and transduced into rhythmic melatonin
signals. These rhythms can be influenced by light intensity and spectral content. In this study
we compared the light sensitivity of Atlantic salmon, European sea bass and Atlantic cod by
testing ex vivo the effect of different intensities and narrow bandwidth lights on nocturnal
melatonin suppression by isolated pineal glands in a flow-through culture system. Using
combinations of neutral density and bandpass interference filters we tested a range of light
intensities (ranging from 1.22 x 1013 – 3.85 x 106 photons.s-1
.cm-2
) and three wavelengths of
80 nm width (472, 555 and 661 nm corresponding to blue, green and red, respectively).
Results showed clear species specific light intensity and spectral sensitivities, with cod being
from 100 to 1000 times more sensitive than sea bass and salmon. Regarding the influence of
spectrum, red light was less efficient on suppressing melatonin than blue and green in salmon
but results were not as clear in the two other species studied. Finally, the first evidence of
relative photoreception in teleosts was obtained in cod suggesting that the definition of
illuminance thresholds (day/night perception) would depend on the day intensity. Indeed, a
single order of magnitude increase or decrease in day intensity was shown to elicit a
significant shift in the intensity response curve of night-time melatonin suppression. Taken
together, this study demonstrated species specific light intensity and spectral sensitivities
within temperate teleosts.
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Citation
General and Comparative Endocrinology
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