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Differences in lens optical plasticity in two gadoid fishes meeting in the Arctic.
- Source :
- Journal of Comparative Physiology A: Neuroethology, Sensory, Neural & Behavioral Physiology; Nov2014, Vol. 200 Issue 11, p949-957, 9p
- Publication Year :
- 2014
-
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. [ABSTRACT FROM AUTHOR]
- Subjects :
- LENSES
FISH adaptation
ATLANTIC cod
GLOBAL warming
Subjects
Details
- Language :
- English
- ISSN :
- 03407594
- Volume :
- 200
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Journal of Comparative Physiology A: Neuroethology, Sensory, Neural & Behavioral Physiology
- Publication Type :
- Academic Journal
- Accession number :
- 99044580
- Full Text :
- https://doi.org/10.1007/s00359-014-0941-z