Volumetric analysis of sensory brain areas indicates ontogenetic shifts in the relative importance of sensory systems in elasmobranchs

Lisney, Thomas J., Bennett, Michael B. and Collin, Shaun P. (2007) Volumetric analysis of sensory brain areas indicates ontogenetic shifts in the relative importance of sensory systems in elasmobranchs. Raffles Bulletin of Zoology, 55 Supp. 14: 7-15.

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Author Lisney, Thomas J.
Bennett, Michael B.
Collin, Shaun P.
Title Volumetric analysis of sensory brain areas indicates ontogenetic shifts in the relative importance of sensory systems in elasmobranchs
Journal name Raffles Bulletin of Zoology   Check publisher's open access policy
ISSN 0217-2445
Publication date 2007
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 55
Issue Supp. 14
Start page 7
End page 15
Total pages 9
Editor P. Ng
Place of publication Singapore
Publisher Natl Univ Singapore, School Biological Sciences
Collection year 2008
Language eng
Subject 780105 Biological sciences
C1
270502 Neurobiology
060805 Animal Neurobiology
Abstract Studies on the brains of teleost fishes have shown that the relative size of sensory brain areas reflects sensory specialisations and the relative importance of a given sensory system. Moreover, the relative size of these brain areas can change in relation to ontogenetic shifts in habitat and feeding ecology. However, although elasmobranchs (sharks, skates and rays) also exhibit ontogenetic shifts in habitat and diet, little is known about how their sensory systems and brains may adapt to these changes. In this paper, we compare the relative volumes of four sensory brain areas; the olfactory bulbs, optic tectum, anterior lateral line lobes and posterior lateral line lobes (that receive input from the olfactory epithelium, eye, electroreceptors and lateral line, respectively) in juveniles and adults of seven species of elasmobranch (six species of shark and one species of ray). The relative volume of each brain area was expressed as proportion of the total sensory brain, the combined volume of the four brain areas. Significant differences were found in the relative proportions of the sensory brain areas between juveniles and adults. In all species, the optic tectum was relatively larger in juveniles, whereas the size of the olfactory bulbs was relatively greater in adults. This paper provides the first evidence for shifts in the size of sensory brain areas in elasmobranchs and suggests that vision is relatively more important than olfaction in juvenile elasmobranchs and vice versa in adults.
Keyword Zoology
brain
ecomorphology
ontogeny
ray
sensory system
shark
Protective Gill Nets
White Shark
Carcharodon-carcharias
Negaprion-brevirostris
Electrosensory System
Response Properties
Feeding-behavior
Coastal Waters
South-africa
Food-habits
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Mon, 18 Feb 2008, 16:21:26 EST