Vision in elasmobranchs and their relatives: 21st century advances

Lisney, T. J., Theiss, S. M., Collin, S. P. and Hart, N. S. (2012) Vision in elasmobranchs and their relatives: 21st century advances. Journal of Fish Biology, 80 5: 2024-2054. doi:10.1111/j.1095-8649.2012.03253.x

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Author Lisney, T. J.
Theiss, S. M.
Collin, S. P.
Hart, N. S.
Title Vision in elasmobranchs and their relatives: 21st century advances
Journal name Journal of Fish Biology   Check publisher's open access policy
ISSN 0022-1112
Publication date 2012-04
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1111/j.1095-8649.2012.03253.x
Open Access Status
Volume 80
Issue 5
Start page 2024
End page 2054
Total pages 31
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell Publishing
Collection year 2013
Language eng
Abstract This review identifies a number of exciting new developments in the understanding of vision in cartilaginous fishes that have been made since the turn of the century. These include the results of studies on various aspects of the visual system including eye size, visual fields, eye design and the optical system, retinal topography and spatial resolving power, visual pigments, spectral sensitivity and the potential for colour vision. A number of these studies have covered a broad range of species, thereby providing valuable information on how the visual systems of these fishes are adapted to different environmental conditions. For example, oceanic and deep-sea sharks have the largest eyes amongst elasmobranchs and presumably rely more heavily on vision than coastal and benthic species, while interspecific variation in the ratio of rod and cone photoreceptors, the topographic distribution of the photoreceptors and retinal ganglion cells in the retina and the spatial resolving power of the eye all appear to be closely related to differences in habitat and lifestyle. Multiple, spectrally distinct cone photoreceptor visual pigments have been found in some batoid species, raising the possibility that at least some elasmobranchs are capable of seeing colour, and there is some evidence that multiple cone visual pigments may also be present in holocephalans. In contrast, sharks appear to have only one cone visual pigment. There is evidence that ontogenetic changes in the visual system, such as changes in the spectral transmission properties of the lens, lens shape, focal ratio, visual pigments and spatial resolving power, allow elasmobranchs to adapt to environmental changes imposed by habitat shifts and niche expansion. There are, however, many aspects of vision in these fishes that are not well understood, particularly in the holocephalans. Therefore, this review also serves to highlight and stimulate new research in areas that still require significant attention.
Keyword Behavioural ecology
Visual pigment
Q-Index Code CX
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Special Issue: The Current Status of Elasmobranchs: Biology, Fisheries and Conservation

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: School of Geography, Planning and Environmental Management Publications
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Created: Mon, 14 May 2012, 21:28:42 EST by System User on behalf of School of Geography, Planning & Env Management