Spectral tuning by selective chromophore uptake in rods and cones of eight populations of nine-spined stickleback (Pungitius pungitius)
The visual pigments of rods and cones were studied in eight Fennoscandian populations of nine-spined stickleback ( Pungitius pungitius ). The wavelength of maximum absorbance of the rod pigment (λ max ) varied between populations from 504 to 530 nm. Gene sequencing showed that the rod opsins of all...
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fthighwire:oai:open-archive.highwire.org:jexbio:215/16/2760 2023-05-15T16:13:05+02:00 Spectral tuning by selective chromophore uptake in rods and cones of eight populations of nine-spined stickleback (Pungitius pungitius) Saarinen, Pia Pahlberg, Johan Herczeg, Gábor Viljanen, Martta Karjalainen, Marika Shikano, Takahito Merilä, Juha Donner, Kristian 2012-08-15 00:00:00.0 text/html http://jeb.biologists.org/cgi/content/short/215/16/2760 https://doi.org/10.1242/jeb.068122 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/215/16/2760 http://dx.doi.org/10.1242/jeb.068122 Copyright (C) 2012, Company of Biologists Research Articles TEXT 2012 fthighwire https://doi.org/10.1242/jeb.068122 2013-05-26T19:10:40Z The visual pigments of rods and cones were studied in eight Fennoscandian populations of nine-spined stickleback ( Pungitius pungitius ). The wavelength of maximum absorbance of the rod pigment (λ max ) varied between populations from 504 to 530 nm. Gene sequencing showed that the rod opsins of all populations were identical in amino acid composition, implying that the differences were due to varying proportions of chromophores A1 and A2. Four spectral classes of cones were found (two S-cones, M-cones and L-cones), correlating with the four classes of vertebrate cone pigments. For quantitative estimation of chromophore proportions, we considered mainly rods and M-cones. In four populations, spectra of both photoreceptor types indicated A2 dominance (population mean λ max =525–530 nm for rods and 535–544 nm for M-cones). In the four remaining populations, however, rod spectra (mean λ max =504–511 nm) indicated strong A1 dominance, whereas M-cone spectra (mean λ max =519-534 nm) suggested substantial fractions of A2. Quantitative analysis of spectra by three methods confirmed that rods and cones in these populations use significantly different chromophore proportions. The outcome is a shift of M-cone spectra towards longer wavelengths and a better match to the photic environment (light spectra peaking >560 nm in all the habitats) than would result from the chromophore proportions of the rods. Chromophore content was also observed to vary partly independently in M- and L-cones with potential consequences for colour discrimination. This is the first demonstration that selective processing of chromophore in rods and cones, and in different cone types, may be ecologically relevant. Text Fennoscandian HighWire Press (Stanford University) Journal of Experimental Biology 215 16 2760 2773 |
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Research Articles Saarinen, Pia Pahlberg, Johan Herczeg, Gábor Viljanen, Martta Karjalainen, Marika Shikano, Takahito Merilä, Juha Donner, Kristian Spectral tuning by selective chromophore uptake in rods and cones of eight populations of nine-spined stickleback (Pungitius pungitius) |
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Research Articles |
description |
The visual pigments of rods and cones were studied in eight Fennoscandian populations of nine-spined stickleback ( Pungitius pungitius ). The wavelength of maximum absorbance of the rod pigment (λ max ) varied between populations from 504 to 530 nm. Gene sequencing showed that the rod opsins of all populations were identical in amino acid composition, implying that the differences were due to varying proportions of chromophores A1 and A2. Four spectral classes of cones were found (two S-cones, M-cones and L-cones), correlating with the four classes of vertebrate cone pigments. For quantitative estimation of chromophore proportions, we considered mainly rods and M-cones. In four populations, spectra of both photoreceptor types indicated A2 dominance (population mean λ max =525–530 nm for rods and 535–544 nm for M-cones). In the four remaining populations, however, rod spectra (mean λ max =504–511 nm) indicated strong A1 dominance, whereas M-cone spectra (mean λ max =519-534 nm) suggested substantial fractions of A2. Quantitative analysis of spectra by three methods confirmed that rods and cones in these populations use significantly different chromophore proportions. The outcome is a shift of M-cone spectra towards longer wavelengths and a better match to the photic environment (light spectra peaking >560 nm in all the habitats) than would result from the chromophore proportions of the rods. Chromophore content was also observed to vary partly independently in M- and L-cones with potential consequences for colour discrimination. This is the first demonstration that selective processing of chromophore in rods and cones, and in different cone types, may be ecologically relevant. |
format |
Text |
author |
Saarinen, Pia Pahlberg, Johan Herczeg, Gábor Viljanen, Martta Karjalainen, Marika Shikano, Takahito Merilä, Juha Donner, Kristian |
author_facet |
Saarinen, Pia Pahlberg, Johan Herczeg, Gábor Viljanen, Martta Karjalainen, Marika Shikano, Takahito Merilä, Juha Donner, Kristian |
author_sort |
Saarinen, Pia |
title |
Spectral tuning by selective chromophore uptake in rods and cones of eight populations of nine-spined stickleback (Pungitius pungitius) |
title_short |
Spectral tuning by selective chromophore uptake in rods and cones of eight populations of nine-spined stickleback (Pungitius pungitius) |
title_full |
Spectral tuning by selective chromophore uptake in rods and cones of eight populations of nine-spined stickleback (Pungitius pungitius) |
title_fullStr |
Spectral tuning by selective chromophore uptake in rods and cones of eight populations of nine-spined stickleback (Pungitius pungitius) |
title_full_unstemmed |
Spectral tuning by selective chromophore uptake in rods and cones of eight populations of nine-spined stickleback (Pungitius pungitius) |
title_sort |
spectral tuning by selective chromophore uptake in rods and cones of eight populations of nine-spined stickleback (pungitius pungitius) |
publisher |
Company of Biologists |
publishDate |
2012 |
url |
http://jeb.biologists.org/cgi/content/short/215/16/2760 https://doi.org/10.1242/jeb.068122 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_relation |
http://jeb.biologists.org/cgi/content/short/215/16/2760 http://dx.doi.org/10.1242/jeb.068122 |
op_rights |
Copyright (C) 2012, Company of Biologists |
op_doi |
https://doi.org/10.1242/jeb.068122 |
container_title |
Journal of Experimental Biology |
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215 |
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16 |
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2760 |
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2773 |
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1765998689282686976 |