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Differences in lens optical plasticity in two gadoid fishes meeting in the Arctic.

Jönsson, Mikael LU ; Varpe, Oystein; Kozlowski, Tomasz LU ; Berge, Jørgen and Kröger, Ronald LU (2014) In Journal of Comparative Physiology A 200(11). p.949-957
Abstract
Arctic and boreal/temperate species are likely to be evolutionary adapted to different light regimes. Currently, the boreal/temperate Atlantic cod (Gadus morhua) is coexisting with the native polar cod (Boreogadus saida) in the Arctic waters around Svalbard, Norway. Here, we studied light/dark adaptative optical plasticity of their eye lenses by exposing fish to bright light during the polar night. Schlieren photography, high-definition laser scanning and ray tracing were used to determine the optical properties of excised crystalline lenses. Both species have multifocal lenses, an optical adaptation for improved color vision. In polar cod, the optical properties of the lens were independent of light exposure. In the more southern Atlantic... (More)
Arctic and boreal/temperate species are likely to be evolutionary adapted to different light regimes. Currently, the boreal/temperate Atlantic cod (Gadus morhua) is coexisting with the native polar cod (Boreogadus saida) in the Arctic waters around Svalbard, Norway. Here, we studied light/dark adaptative optical plasticity of their eye lenses by exposing fish to bright light during the polar night. Schlieren photography, high-definition laser scanning and ray tracing were used to determine the optical properties of excised crystalline lenses. Both species have multifocal lenses, an optical adaptation for improved color vision. In polar cod, the optical properties of the lens were independent of light exposure. In the more southern Atlantic cod, the optical properties of the lens changed within hours upon exposure to light, even after months of darkness. Such fast optical adjustment has previously only been shown in a tropical cichlid. During the polar night the Atlantic cod lens seems to be unregulated and dysfunctional since it had an unsuitable focal length and severe spherical aberration. We present a system, to our knowledge unique, for studying visual plasticity on different timescales in relation to evolutionary history and present the first study on the polar cod visual system. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Comparative Physiology A
volume
200
issue
11
pages
949 - 957
publisher
Springer
external identifiers
  • pmid:25240636
  • wos:000344328500004
  • scopus:84910119437
ISSN
1432-1351
DOI
10.1007/s00359-014-0941-z
language
English
LU publication?
yes
id
e5a002eb-cff2-4b07-9db9-4d0e607bb04e (old id 4691142)
date added to LUP
2014-10-09 14:51:50
date last changed
2017-01-01 04:18:31
@article{e5a002eb-cff2-4b07-9db9-4d0e607bb04e,
  abstract     = {Arctic and boreal/temperate species are likely to be evolutionary adapted to different light regimes. Currently, the boreal/temperate Atlantic cod (Gadus morhua) is coexisting with the native polar cod (Boreogadus saida) in the Arctic waters around Svalbard, Norway. Here, we studied light/dark adaptative optical plasticity of their eye lenses by exposing fish to bright light during the polar night. Schlieren photography, high-definition laser scanning and ray tracing were used to determine the optical properties of excised crystalline lenses. Both species have multifocal lenses, an optical adaptation for improved color vision. In polar cod, the optical properties of the lens were independent of light exposure. In the more southern Atlantic cod, the optical properties of the lens changed within hours upon exposure to light, even after months of darkness. Such fast optical adjustment has previously only been shown in a tropical cichlid. During the polar night the Atlantic cod lens seems to be unregulated and dysfunctional since it had an unsuitable focal length and severe spherical aberration. We present a system, to our knowledge unique, for studying visual plasticity on different timescales in relation to evolutionary history and present the first study on the polar cod visual system.},
  author       = {Jönsson, Mikael and Varpe, Oystein and Kozlowski, Tomasz and Berge, Jørgen and Kröger, Ronald},
  issn         = {1432-1351},
  language     = {eng},
  number       = {11},
  pages        = {949--957},
  publisher    = {Springer},
  series       = {Journal of Comparative Physiology A},
  title        = {Differences in lens optical plasticity in two gadoid fishes meeting in the Arctic.},
  url          = {http://dx.doi.org/10.1007/s00359-014-0941-z},
  volume       = {200},
  year         = {2014},
}