Relative eye size in elasmobranchs

Lisney, Thomas J. and Collin, Shaun P. (2007) Relative eye size in elasmobranchs. Brain Behavior and Evolution, 69 4: 266-279. doi:10.1159/000100036

Author Lisney, Thomas J.
Collin, Shaun P.
Title Relative eye size in elasmobranchs
Journal name Brain Behavior and Evolution   Check publisher's open access policy
ISSN 0006-8977
Publication date 2007-04
Sub-type Article (original research)
DOI 10.1159/000100036
Volume 69
Issue 4
Start page 266
End page 279
Total pages 14
Editor W. Wilczynski
Place of publication Basel, Switzerland
Publisher S. Karger
Collection year 2008
Language eng
Subject 270502 Neurobiology
780105 Biological sciences
060805 Animal Neurobiology
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. Copyright © 2007 S. Karger AG, Basel
Keyword Behavioral Sciences
Comparative analysis
Visual system
Ray torpedo-californica
Retinal specializations
Independent contrasts
Predatory behavior
Q-Index Code C1
Q-Index Status Confirmed Code

Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 31 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 32 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Mon, 18 Feb 2008, 16:42:18 EST