Variation in Brain Organization and Cerebellar Foliation in Chondrichthyans: Batoids

Lisney, T. J., Yopak, K. E., Montgomery, J. C. and Collin, S. P. (2009) Variation in Brain Organization and Cerebellar Foliation in Chondrichthyans: Batoids. Brain, Behavior and Evolution, 72 4: 262-282. doi:10.1159/000171489

Author Lisney, T. J.
Yopak, K. E.
Montgomery, J. C.
Collin, S. P.
Title Variation in Brain Organization and Cerebellar Foliation in Chondrichthyans: Batoids
Journal name Brain, Behavior and Evolution   Check publisher's open access policy
ISSN 0006-8977
Publication date 2009
Year available 2008
Sub-type Article (original research)
DOI 10.1159/000171489
Volume 72
Issue 4
Start page 262
End page 282
Total pages 21
Editor Wilczynski, W
Place of publication Switzerland
Publisher S. Karger AG
Collection year 2009
Language eng
Subject C1
110906 Sensory Systems
830102 Aquaculture Fin Fish (excl. Tuna)
970111 Expanding Knowledge in the Medical and Health Sciences
Abstract Interspecific variation in relative brain size (encephalization), the relative size of the five major brain areas (the telencephalon, diencephalon, mesencephalon, cerebellum, and medulla) and the level of cerebellar foliation was assessed in over 20 representative species of batoid (skates and rays), from eight families. Using species as independent data points and phylogenetically independent contrasts, relationships among each of the neuroanatomical variables and two ecological variables, habitat and lifestyle, were assessed. Variation in relative brain size and brain organization appears to be strongly correlated with phylogeny. Members of the basal orders Rajiformes and Torpediniformes tend to have relatively small brains, with relatively small telencephalons, large medullas, and smooth, unfoliated cerebellums. More advanced Myliobatiformes possess relatively large brains, with relatively large telencephalons, small medullas, and complex, heavily foliated cerebellums. Increased brain size, telencephalon size, and cerebellar foliation also correlate with living in a complex habitat (such as in association with coral reefs) and an active, benthopelagic lifestyle, but as primary habitat and lifestyle also closely match phylogenetic relationships in batoids, it is difficult to separate the influence of phylogeny and ecological factors on brain organization in these animals. However, the results of two forms of multivariate analysis (principal component analysis and cluster analysis) reveal that certain species are clustered with others that share ecological traits, rather than with more closely related species from the same order. This suggests that ecological factors do play a role in defining patterns of brain organization and there is some evidence for 'cerebrotypes' in batoids.
Keyword Allometry
Nervous system
comparative brain morphology
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Biomedical Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 20 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 18 Mar 2009, 12:12:19 EST