The brain organization of butterflyfishes

Bauchot, Roland; Ridet, J; Bauchot, Marie-Louise

doi:10.1007/bf00002213

Cited by 25 publications

(16 citation statements)

References 10 publications

(1 reference statement)

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“…The telencephalon, which is involved in spatial navigation and learning [Portavella et al, 2002], may be more important for littoral fish species because of the more complex structure of that habitat and the more extensive breadth of prey it displays. This idea is additionally supported by previous studies showing that fish species occupying complex habitats have a relatively large telencephalon [Bauchot et al, 1989;Huber et al, 1997;Shumway, 2008;GonzalezVoyer and Kolm, 2010]. Conversely, the cerebellum, which is responsible for motor control, may be more important for pelagic species because of the three-dimensional nature of large open waters.…”

Section: Brain Regions and Habitat Usesupporting

confidence: 71%

“…This idea is supported by our results and the large relative cerebellum size in pelagic sharks and highly active pelagic marine teleosts [Kruska, 1988;Lisney and Collin, 2006]. On the other hand, research showing an association between large cerebellum size and high habitat complexity in fish is at odds with these findings [Bauchot et al, 1989;Pollen et al, 2007;Shumway, 2008;Gonzalez-Voyer and Kolm, 2010]. This might be due to methodological differences between studies, especially with respect to how habitat use was evaluated (i.e.…”

Section: Brain Regions and Habitat Usecontrasting

confidence: 54%

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Food Web Structure Shapes the Morphology of Teleost Fish Brains

Edmunds¹,

McCann²,

Laberge³

2016

Brain Behav Evol

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Previous work showed that teleost fish brain size correlates with the flexible exploitation of habitats and predation abilities in an aquatic food web. Since it is unclear how regional brain changes contribute to these relationships, we quantitatively examined the effects of common food web attributes on the size of five brain regions in teleost fish at both within-species (plasticity or natural variation) and between-species (evolution) scales. Our results indicate that brain morphology is influenced by habitat use and trophic position, but not by the degree of littoral-pelagic habitat coupling, despite the fact that the total brain size was previously shown to increase with habitat coupling in Lake Huron. Intriguingly, the results revealed two potential evolutionary trade-offs: (i) relative olfactory bulb size increased, while relative optic tectum size decreased, across a trophic position gradient, and (ii) the telencephalon was relatively larger in fish using more littoral-based carbon, while the cerebellum was relatively larger in fish using more pelagic-based carbon. Additionally, evidence for a within-species effect on the telencephalon was found, where it increased in size with trophic position. Collectively, these results suggest that food web structure has fundamentally contributed to the shaping of teleost brain morphology.

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Section: Brain Regions and Habitat Usesupporting

confidence: 71%

Section: Brain Regions and Habitat Usecontrasting

confidence: 54%

Food Web Structure Shapes the Morphology of Teleost Fish Brains

Edmunds¹,

McCann²,

Laberge³

2016

Brain Behav Evol

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“…From an ecological perspective, the species with the largest brains relative to body mass are chiefly agile, active predators with benthopelagic or pelagic lifestyles. These species are found in reef-associated or oceanic habitats, as do the teleosts with the largest brains (Bauchot, 1987;Bauchot et al, 1989), which may be linked to 1988 K . E .…”

Section: Brain Scaling E N C E P H a L I Z At I O Nmentioning

confidence: 99%

Neuroecology of cartilaginous fishes: the functional implications of brain scaling

Yopak

2012

Journal of Fish Biology

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It is a widely accepted view that neural development can reflect morphological adaptations and sensory specializations. The aim of this review is to give a broad overview of the current status of brain data available for cartilaginous fishes and examine how perspectives on allometric scaling of brain size across this group of fishes has changed within the last 50 years with the addition of new data and more rigorous statistical analyses. The current knowledge of neuroanatomy in cartilaginous fishes is reviewed and data on brain size (encephalization, n = 151) and interspecific variation in brain organization (n = 84) has been explored to ascertain scaling relationships across this clade. It is determined whether similar patterns of brain organization, termed cerebrotypes, exist in species that share certain lifestyle characteristics. Clear patterns of brain organization exist across cartilaginous fishes, irrespective of phylogenetic grouping and, although this study was not a functional analysis, it provides further evidence that chondrichthyan brain structures might have developed in conjunction with specific behaviours or enhanced cognitive capabilities. Larger brains, with well‐developed telencephala and large, highly foliated cerebella are reported in species that occupy complex reef or oceanic habitats, potentially identifying a reef‐associated cerebrotype. In contrast, benthic and benthopelagic demersal species comprise the group with the smallest brains, with a relatively reduced telencephalon and a smooth cerebellar corpus. There is also evidence herein of a bathyal cerebrotype; deep‐sea benthopelagic sharks possess relatively small brains and show a clear relative hypertrophy of the medulla oblongata. Despite the patterns observed and documented, significant gaps in the literature have been highlighted. Brain mass data are only currently available on c. 16% of all chondrichthyan species, and only 8% of species have data available on their brain organization, with far less on subsections of major brain areas that receive distinct sensory input. The interspecific variability in brain organization further stresses the importance of performing functional studies on a greater range of species. Only an expansive data set, comprised of species that span a variety of habitats and taxonomic groups, with widely disparate behavioural repertoires, combined with further functional analyses, will help shed light on the extent to which chondrichthyan brains have evolved as a consequence of behaviour, habitat and lifestyle in addition to phylogeny.

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“…However, the organization of the butterflyfish forebrain, a region that would be involved in the regulation of social behavior, remains undescribed. Two previous studies describe several brain regions [Snow and Rylander, 1982;Bauchot et al, 1989], but a more complete study is needed to provide the neuroanatomical support for comparative studies focused on the neural regulation of behavior [e.g. .…”

mentioning

confidence: 99%

Cytoarchitecture of the Telencephalon in the Coral Reef Multiband Butterflyfish (<b><i>Chaetodon multicinctus</i></b>: Perciformes)

Dewan

Tricas²

2014

Brain Behav Evol

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Detailed neuroanatomical studies of model species are necessary to facilitate comparative experiments which test hypotheses relevant to brain evolution and function. Butterflyfishes (Chaetodontidae) boast numerous sympatric species that differ in social behavior, aggression and feeding ecology. However, the ability to test hypotheses relevant to brain function in this family is hindered by the lack of detailed neural descriptions. The cytoarchitecture of the telencephalon in the monogamous and territorial multiband butterflyfish, Chaetodon multicinctus, was determined with Nissl-stained serial sections and an immunohistochemical analysis of arginine vasotocin (AVT), serotonin, substance P and tyrosine hydroxylase. The ventral telencephalon was similar to that of other perciform fishes studied, with one major difference. A previously undescribed postcommissural region, the cuneate nucleus, was identified and putatively assigned to the ventral telencephalon. While the function of this nucleus is unknown, preliminary studies indicate that it may be part of a behaviorally relevant subpallial neural circuit that is modulated by AVT. The dorsal telencephalon consisted of 15 subdivisions among central, medial, lateral, dorsal and posterior zones. Several regions of the dorsal telencephalon of C. multicinctus differed from many other perciform fishes examined thus far. The nucleus taenia was in a more caudal position, and the central and lateral zones were enlarged. Within the lateral zone, an unusual third, ventral subdivision and a large-celled division were present. One hypothesis is that the enlarged ventral subdivision of the lateral zone (potential hippocampus homolog) relates to an enhancement of spatial learning or olfactory memory, which are important for this coral reef fish. This study provides the neuroanatomical basis for future comparative and evolutionary studies of brain organization and neuropeptide distributions, physiological studies of neural processing and insight into the complex social behavior of butterflyfishes.

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The brain organization of butterflyfishes

Cited by 25 publications

References 10 publications

Food Web Structure Shapes the Morphology of Teleost Fish Brains

Food Web Structure Shapes the Morphology of Teleost Fish Brains

Neuroecology of cartilaginous fishes: the functional implications of brain scaling

Cytoarchitecture of the Telencephalon in the Coral Reef Multiband Butterflyfish (<b><i>Chaetodon multicinctus</i></b>: Perciformes)

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