QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

First published online February 1, 2008
Journal of Experimental Biology 211, 482-490 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.014506

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by McComb, D. M. Articles by Kajiura, S. M. Search for Related Content PubMed PubMed Citation Articles by McComb, D. M. Articles by Kajiura, S. M. Social Bookmarking                         What's this?

Visual fields of four batoid fishes: a comparative study

D. Michelle McComb^* and Stephen M. Kajiura

Biological Sciences, Florida Atlantic University, Boca Raton, FL 33431, USA

^* Author for correspondence (e-mail: dmccomb{at}fau.edu)

Accepted 12 December 2007

The visual fields of elasmobranch fishes are not well characterized even though this is a fundamental element of the visual system. The batoid fishes (skates, rays) form a monophyletic clade within the subclass Elasmobranchii and exhibit a broad range of morphologies and corresponding ecologies. We hypothesized that their visual field characteristics would reflect their diverse morphology and ecology. This was tested by quantifying the monocular, binocular and cyclopean horizontal and vertical visual fields of four batoid species (Raja eglanteria, Urobatis jamaicensis, Dasyatis sabina and Rhinoptera bonasus) that encompassed a range from a basal skate to a more derived ray. The horizontal and vertical visual fields differed significantly among species; however, all species possessed horizontal anterior and dorsal binocular overlaps. Urobatis jamaicensis, a small reef-associated stingray, demonstrated a 360° panoramic visual field in the horizontal plane, and R. bonasus, a schooling benthopelagic ray, a 360° panoramic view in the vertical plane. Large anterior binocular overlaps were measured in D. sabina (72°) and R. bonasus (46°) but came at the expense of large posterior blind areas. The anterior binocular overlaps in R. eglanteria (28°) and U. jamaicensis (34°) were smaller but were coupled with large monocular fields that provided expansive peripheral views. The most phylogenetically basal species, the clearnose skate (Raja eglanteria), had the most reduced visual field in contrast to the more derived ray species. To our knowledge, this study represents the first comparative assessment of visual fields in basal vertebrates.

Key words: vision, elasmobranch, skate, ray, binocular, convergence, Dasyatis sabina, Raja eglanteria, Rhinoptera bonasus, Urobatis jamaicensis

CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?

This article has been cited by other articles:

				L. K. Jordan, S. M. Kajiura, and M. S. Gordon Functional consequences of structural differences in stingray sensory systems. Part I: mechanosensory lateral line canals J. Exp. Biol., October 1, 2009; 212(19): 3037 - 3043. [Abstract] [Full Text] [PDF]