Journal article
Climatic adaptation in human inferior nasal turbinate morphology: Evidence from Arctic and equatorial populations
American journal of physical anthropology, Vol.169(3), pp.498-512
07/2019
DOI: 10.1002/ajpa.23840
PMID: 30993687
Abstract
The nasal turbinates directly influence the overall size, shape, and surface area of the nasal passages, and thus contribute to intranasal heat and moisture exchange. However, unlike the encapsulating walls of the nasal cavity, ecogeographic variation in nasal turbinate morphology among humans has not yet been established. Here we investigate variation in inferior nasal turbinate morphology in two populations from climatically extreme environments.
Twenty-three linear measurements of the inferior turbinate, nasal cavity walls, and airway passages were collected from CT scans of indigenous modern human crania from Equatorial Africa (n = 35) and the Arctic Circle (n = 35). MANOVA and ANCOVA were employed to test for predicted regional and sex differences in morphology between the samples.
Significant morphological differences were identified between the two regional samples, with no evidence of significant sexual dimorphism or region-sex interaction effect. Individuals from the Arctic Circle possessed superoinferiorly and mediolaterally larger inferior turbinates compared to Equatorial Africans. In conjunction with the surrounding nasal cavity walls, these differences in turbinate morphology produced airway dimensions that were both consistent with functional expectations and more regionally distinct than either skeletal component independently.
This study documents the existence of ecogeographic variation in human nasal turbinate morphology reflecting climate-mediated evolutionary demands on intranasal heat and moisture exchange. Humans adapted to cold-dry environments exhibit turbinate morphologies that enhance contact between respired air and nasal mucosa to facilitate respiratory air conditioning. Conversely, humans adapted to hot-humid environments exhibit turbinate morphologies that minimize air-to-mucosa contact, likely to minimize airflow resistance and/or facilitate expiratory heat-shedding.
Details
- Title: Subtitle
- Climatic adaptation in human inferior nasal turbinate morphology: Evidence from Arctic and equatorial populations
- Creators
- Tarah N Marks - University of IowaScott D Maddux - University of North Texas Health Science CenterLauren N Butaric - Des Moines UniversityRobert G Franciscus - University of Iowa
- Resource Type
- Journal article
- Publication Details
- American journal of physical anthropology, Vol.169(3), pp.498-512
- DOI
- 10.1002/ajpa.23840
- PMID
- 30993687
- ISSN
- 0002-9483
- eISSN
- 1096-8644
- Language
- English
- Date published
- 07/2019
- Academic Unit
- Orthodontics; Anthropology
- Record Identifier
- 9984270194202771
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