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Interspecific Variation in the Inner Ear Maculae of Sharks

There is well-documented diversity in the organization of inner ear hair cells in fishes; this variation is thought to reflect the differing functional requirements of species across a range of ecological niches. However, relatively little is known about interspecific variation (and its potential ec...

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Detalles Bibliográficos
Autores principales: Sauer, Derek J, Yopak, Kara E, Radford, Craig A
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10506894/
https://www.ncbi.nlm.nih.gov/pubmed/37732173
http://dx.doi.org/10.1093/iob/obad031
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author Sauer, Derek J
Yopak, Kara E
Radford, Craig A
author_facet Sauer, Derek J
Yopak, Kara E
Radford, Craig A
author_sort Sauer, Derek J
collection PubMed
description There is well-documented diversity in the organization of inner ear hair cells in fishes; this variation is thought to reflect the differing functional requirements of species across a range of ecological niches. However, relatively little is known about interspecific variation (and its potential ecological implications) in the number and density of inner ear hair cells in elasmobranchs (sharks, skates, and rays). In this study, we quantified inner ear hair cells in the saccule, lagena, utricle, and macula neglecta of 9 taxonomically and ecologically distinct shark species. Using phylogenetically informed comparative approaches, sharks that feed in the water column had significantly greater hair cell density and total number of hair cells in the lagena and macula neglecta (i.e., vertically oriented maculae) compared to species that feed primarily on the seafloor. In addition, sharks within Carcharhinidae seemingly possess a specialized macula neglecta compared to other shark species. Overall, findings suggest that, similar to bony fishes, there is considerable variation in hair cell organization of shark inner ears, which may be tied to variation in ecology and/or specialized behaviors between different species.
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spelling pubmed-105068942023-09-20 Interspecific Variation in the Inner Ear Maculae of Sharks Sauer, Derek J Yopak, Kara E Radford, Craig A Integr Org Biol Article There is well-documented diversity in the organization of inner ear hair cells in fishes; this variation is thought to reflect the differing functional requirements of species across a range of ecological niches. However, relatively little is known about interspecific variation (and its potential ecological implications) in the number and density of inner ear hair cells in elasmobranchs (sharks, skates, and rays). In this study, we quantified inner ear hair cells in the saccule, lagena, utricle, and macula neglecta of 9 taxonomically and ecologically distinct shark species. Using phylogenetically informed comparative approaches, sharks that feed in the water column had significantly greater hair cell density and total number of hair cells in the lagena and macula neglecta (i.e., vertically oriented maculae) compared to species that feed primarily on the seafloor. In addition, sharks within Carcharhinidae seemingly possess a specialized macula neglecta compared to other shark species. Overall, findings suggest that, similar to bony fishes, there is considerable variation in hair cell organization of shark inner ears, which may be tied to variation in ecology and/or specialized behaviors between different species. Oxford University Press 2023-09-04 /pmc/articles/PMC10506894/ /pubmed/37732173 http://dx.doi.org/10.1093/iob/obad031 Text en © The Author(s) 2023. Published by Oxford University Press on behalf of the Society for Integrative and Comparative Biology. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Article
Sauer, Derek J
Yopak, Kara E
Radford, Craig A
Interspecific Variation in the Inner Ear Maculae of Sharks
title Interspecific Variation in the Inner Ear Maculae of Sharks
title_full Interspecific Variation in the Inner Ear Maculae of Sharks
title_fullStr Interspecific Variation in the Inner Ear Maculae of Sharks
title_full_unstemmed Interspecific Variation in the Inner Ear Maculae of Sharks
title_short Interspecific Variation in the Inner Ear Maculae of Sharks
title_sort interspecific variation in the inner ear maculae of sharks
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10506894/
https://www.ncbi.nlm.nih.gov/pubmed/37732173
http://dx.doi.org/10.1093/iob/obad031
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