Vision in lungfish

Marshall, Justin, Collin, Shaun, Hart, Nathan and Bailes, Helena (2011). Vision in lungfish. In Jørgen Mørup Jørgensen and Jean Joss (Ed.), The Biology of Lungfishes (pp. 447-472) Enfield, NH, U.S.A.: Science Publishers. doi:10.1201/b10357-18

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Author Marshall, Justin
Collin, Shaun
Hart, Nathan
Bailes, Helena
Title of chapter Vision in lungfish
Title of book The Biology of Lungfishes
Place of Publication Enfield, NH, U.S.A.
Publisher Science Publishers
Publication Year 2011
Sub-type Research book chapter (original research)
DOI 10.1201/b10357-18
ISBN 9781578084319
1578084318
9781439848616
1439848610
Editor Jørgen Mørup Jørgensen
Jean Joss
Chapter number 17
Start page 447
End page 472
Total pages 26
Total chapters 20
Collection year 2012
Language eng
Formatted Abstract/Summary
All three extant genera of lungfish, Australian, African and South American, appear to possess unremarkable, even ‘degenerate eyes’ when viewed externally. The eyes of the Australian lungfish, Neoceratodus forsteri, are slightly larger than those of the other species (seven African species in the genus Protopterus and the single South American species Lepidosiren paradoxa). N. forsteri seems to be the most visually-oriented of the extant lungfi shes. All three genera of lungfish, however, possess remarkable and beautiful retinal adaptations, including, coloured oil droplets, multiple cone spectral sensitivities and large photoreceptor inner segments, making them more closely aligned in design to modern amphibians and other terrestrial animals, than to teleosts. The tetrapod-like retinal features of N. forsteri provide the capability for tetrachromatic colour vision and add to the debate on the phylogenetic origin(s) of lungfish. They also suggest that the complex colour vision system of vertebrates on land, exemplified by birds, may have first evolved in the aquatic environment or at least close to the time when aquatic life emerged onto land. Other ocular adaptations in dipnoans include a non-spherical lens, the anatomical mechanism for accommodation, a mobile pupil and giant retinal cells. This eye design suggests a need to increase light flux, rather than for a reliance on high spatial acuity, a conclusion supported by the relatively low ganglion cell densities. Future work should certainly aim at a better understanding of the visual biology, behaviour and ecology of all lungfish, especially in light of their disappearing habitat worldwide. Both African and South American species also need a full description of their visual system before they are properly consigned to being ‘less well developed’, than N. forsteri.
Keyword Vision
Colour
Visual ecology
Colour signals
Neurobiology
Q-Index Code B1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Thu, 10 Nov 2011, 16:45:50 EST by Debra McMurtrie on behalf of School of Biomedical Sciences