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Original Paper

Relative Eye Size in Elasmobranchs

Lisney T.J. · Collin S.P.

Author affiliations

School of Biomedical Sciences, Vision Touch and Hearing Research Centre, The University of Queensland, Brisbane, Australia

Related Articles for ""

Brain Behav Evol 2007;69:266–279

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: May 09, 2006
Accepted: July 27, 2006
Published online: February 21, 2007
Issue release date: April 2007

Number of Print Pages: 14
Number of Figures: 5
Number of Tables: 1

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: http://www.karger.com/BBE

Abstract

Variation in relative eye size was investigated in a sample of 46 species of elasmobranch, 32 species of sharks and 14 species of batoids (skates and rays). To get a measure of eye size relative to body size, eye axial diameter was scaled with body mass using least-squares linear regression, using both raw species data, where species are treated as independent data points, and phylogenetically independent contrasts. Residual values calculated for each species, using the regression equations describing these scaling relationships, were then used as a measure of relative eye size. Relative and absolute eye size varies considerably in elasmobranchs, although sharks have significantly relatively larger eyes than batoids. The sharks with the relatively largest eyes are oceanic species; either pelagic sharks that move between the epipelagic (0–200 m) and ‘upper’ mesopelagic (200–600 m) zones, or benthic and benthopelagic species that live in the mesopelagic (200–1,000 m) and, to a lesser extent, bathypelagic (1,000–4,000 m) zones. The elasmobranchs with the relatively smallest eyes tend to be coastal, often benthic, batoids and sharks. Active benthopelagic and pelagic species, which prey on active, mobile prey also have relatively larger eyes than more sluggish, benthic elasmobranchs that feed on more sedentary prey such as benthic invertebrates. A significant positive correlation was found between absolute eye size and relative eye size, but some very large sharks, such as Carcharodon carcharias have absolutely large eyes, but have relatively small eyes in relation to body mass.

© 2007 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: May 09, 2006
Accepted: July 27, 2006
Published online: February 21, 2007
Issue release date: April 2007

Number of Print Pages: 14
Number of Figures: 5
Number of Tables: 1

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: http://www.karger.com/BBE


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