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Middle ear pneumatization in nonhuman primates: A comparative analysis
Margot Bernardi1,2, Sébastien Couette1,2, Carmela Chateau Smith3
1EPHE, PSL Research University Paris, Paris, France.
American Journal of Physical Anthropology
|May 1, 2019
Summary
Body mass and phylogeny influence primate middle ear cavity pneumatization. Greater pneumatization in middle ear spaces (MES) correlates with better low-frequency hearing in haplorhines.
Area of Science:
- Comparative anatomy
- Primate evolution
- Auditory physiology
Background:
- Middle ear cavity pneumatization varies across primate species.
- Pneumatization's role in auditory function is not fully understood.
- Understanding these factors aids in reconstructing primate evolutionary history.
Purpose of the Study:
- To investigate the effects of body mass and phylogeny on primate middle ear cavity pneumatization.
- To determine the role of pneumatization in hearing function across diverse nonhuman primates.
Main Methods:
- 3D segmentation of middle ear cavities from scans of 96 primate specimens across 27 species.
- Measurement of tympanic cavity (TC) and other middle ear spaces (MES) using surface area-to-volume ratio.
- Statistical analyses including linear regression, phylogenetic signal tests (Kappa statistic, OU models), and phylogenetic regression.
Main Results:
- Body mass shows an allometric pattern in TC and MES dimensions.
- MES pneumatization is body mass-dependent in haplorhines; larger primates have more pneumatized MES.
- Auditory performance is significantly linked to MES pneumatization, enhancing low-frequency perception.
Conclusions:
- Middle ear space pneumatization is subject to differential selective pressures.
- Pneumatization likely enhances hearing sensitivity through pressure regulation and frequency modulation.
- Divergent adaptations in strepsirrhines (high-frequency) and haplorhines (broad-range) are explained by pneumatization.
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