What are the limits on whale ear bone size? Non-isometric scaling of the cetacean bulla.
Allometry
Bulla
Cetacean
Ear
Evolution
Mysticete
Odontocete
Scaling
Stem cetacean
Whale
Journal
PeerJ
ISSN: 2167-8359
Titre abrégé: PeerJ
Pays: United States
ID NLM: 101603425
Informations de publication
Date de publication:
2021
2021
Historique:
received:
07
09
2020
accepted:
11
01
2021
entrez:
19
2
2021
pubmed:
20
2
2021
medline:
20
2
2021
Statut:
epublish
Résumé
The history of cetaceans demonstrates dramatic macroevolutionary changes that have aided their transformation from terrestrial to obligate aquatic mammals. Their fossil record shows extensive anatomical modifications that facilitate life in a marine environment. To better understand the constraints on this transition, we examined the physical dimensions of the bony auditory complex, in relation to body size, for both living and extinct cetaceans. We compared the dimensions of the tympanic bulla, a conch-shaped ear bone unique to cetaceans, with bizygomatic width-a proxy for cetacean body size. Our results demonstrate that cetacean ears scale non-isometrically with body size, with about 70% of variation explained by increases in bizygomatic width. Our results, which encompass the breadth of the whale fossil record, size diversity, and taxonomic distribution, suggest that functional auditory capacity is constrained by congruent factors related to cranial morphology, as opposed to allometrically scaling with body size.
Identifiants
pubmed: 33604200
doi: 10.7717/peerj.10882
pii: 10882
pmc: PMC7869665
doi:
Types de publication
Journal Article
Langues
eng
Pagination
e10882Informations de copyright
© 2021 Groves et al.
Déclaration de conflit d'intérêts
Nicholas D. Pyenson is an Academic Editor for PeerJ.
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