Dental linear metrics from a wild population of baboons (Papio cynocephalus), Kenya
Data files
Aug 08, 2024 version files 54.28 KB
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dental_metrics_papio_cynocephalus_Hlusko.txt
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README.md
Abstract
This dataset contains 82 standard linear dimensions of maxillary and mandibular teeth from 126 individuals from a wild population of yellow baboons (Papio hamadrays cynocephalus, or Papio cynocephalus, depending on your taxonomic practice for baboons) from Kenya. The measurements were taken from a skeletonized population of baboons culled because they were "pests" to a sisal plantation. The Director of the Department of Osteology at the Kenyan National Museums collected the carcasses and prepared them as skeletons. The specimens are located in Nairobi, housed in the Kenyan National Museums. See our 2007 paper for more details. The research question driving this data collection was to test whether or not the latent structure of dental phenotypic variation within a wild population of baboons is similar to the dental phenotypic variation in a captive, pedigreed population of baboons. We had conducted quantitative genetic analyses of dental variation in the captive colony used for quantitative genetics research but had repeatedly been asked whether or not the genetic architecture influencing the captive colony's dental variation was similar to that of their wild counterparts. These data enabled us to test this hypothesis, and in so doing, support the hypothesis that the pattern of phenotypic dental variation is essentially the same. The second molars from this dataset were used in analyses reported in this publication:
- Hlusko, L.J. and Mahaney, M.C., 2007. A multivariate comparison of dental variation in wild and captive populations of baboons (Papio hamadryas). Archives of oral biology, 52(2), pp.195-200. https://doi.org/10.1016/j.archoralbio.2006.09.008
We share here the wild population data, as they can be useful to anyone interested in dental phenotypic variation and covariation in wild baboons. The individuals in this population are KNOWN TO BE RELATED to each other. Therefore, the range of variation is not representative of a sample of unrelated individuals from this species. The similarity between phenotypic and genotypic correlations was proposed by James Cheverud, and has been tested as "Cheverud's Conjecture" in evolutionary biology:
- Cheverud, J.M. 1988. A comparison of genetic and phenotypic correlations. Evolution 42: 958-968. doi: 10.1111/j.1558-5646.1988.tb02514.x
- Roff, D.A. 1995. The estimation of genetic correlations from phenotypic correlations: a test of Cheverud's conjecture. Heredity 74:481-490. doi: 10.1038/hdy.1995.68
- Sodini S.M., Kemper K.E., Wray N.R., Trzaskowski M. 2018. Comparison of genotypic and phenotypic correlations: Cheverud's conjecture in humans. Genetics 209(3):941-948. doi: 10.1534/genetics.117.300630
README: Dental linear metrics from a wild population of baboons (Papio cynocephalus), Kenya
https://doi.org/10.5061/dryad.sj3tx96d6
Description of the data and file structure
The data are uploaded in a tab-delimited text file. All measurements are in millimeters.
Details about each of the 84 columns in the dataset and definitions of the 82 measurements:
Column Name | Definition |
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ID | unique number for each individual, following the numbers that are used in the KNM Department of Osteology |
sex | This is either M for male, F for female, and J for indeterminate, determined by Leslea Hlusko following the morphology of the canine-honing-complex, which is highly sexually dimorphic in baboons |
XLM3md | mesiodistal dimension of the left maxillary third molar |
XLM3mbl | buccolingual dimension across the mesial cusp pairs, left maxillary third molar |
XLM3dbl | buccolingual dimension across the distal cusp pairs, left maxillary third molar |
XLM2md | mesiodistal dimension of the left maxillary second molar |
XLM2mbl | buccolingual dimension across the mesial cusp pairs, left maxillary second molar |
XLM2dbl | buccolingual dimension across the distal cusp pairs, left maxillary second molar |
XLM1md | mesiodistal dimension of the left maxillary first molar |
XLM1mbl | buccolingual dimension across the mesial cusp pairs, left maxillary first molar |
XLM1dbl | buccolingual dimension across the distal cusp pairs, left maxillary first molar |
XLP4md | mesiodistal dimension of the left maxillary fourth premolar |
XLP4bl | buccolingual dimension of the left maxillary fourth premolar |
XLP3md | mesiodistal dimension of the left maxillary third premolar |
XLP3bl | buccolingual dimensions of the left maxillary third premolar |
XLCmd | mesiodistal dimension at the base of the crown of the left maxillary canine (measured along the axis of the tooth and not following the dental arcade) |
XLCbl | buccolingual dimensions at the base of the crown of the left maxillary canine (perpendicular to the md main axis of the crown) |
XLI2md | maximum mesiodistal dimension of the left maxillary second incisor |
XLI2bl | maximum buccolingual dimension from occlusal view (directly perpendicular) of the left maxillary second incisor |
XLI1md | maximum mesiodistal dimension of the left maxillary first incisor |
XLI1bl | maximum buccolingual dimension from occlusal view (directly perpendicular) of the left maxillary first incisor |
XRI1md | maximum mesiodistal dimension of the right maxillary first incisor |
XRI1bl | maximum buccolingual dimension from occlusal view (directly perpendicular) of the right maxillary first incisor |
XRI2md | maximum mesiodistal dimension of the right maxillary second incisor |
XRI2bl | maximum buccolingual dimension from occlusal view (directly perpendicular) of the right maxillary second incisor |
XRCmd | mesiodistal dimension at the base of the crown of the right maxillary canine (measured along the axis of the tooth and not following the dental arcade) |
XRCbl | buccolingual dimensions at the base of the crown of the right maxillary canine (perpendicular to the md main axis of the crown) |
XRP3md | mesiodistal dimension of the right maxillary third premolar |
XRP3bl | buccolingual dimensions of the right maxillary third premolar |
XRP4md | mesiodistal dimension of the right maxillary fourth premolar |
XRP4bl | buccolingual dimension of the right maxillary fourth premolar |
XRM1md | mesiodistal dimension of the right maxillary first molar |
XRM1mbl | buccolingual dimension across the mesial cusp pairs, right maxillary first molar |
XRM1dbl | buccolingual dimension across the distal cusp pairs, right maxillary first molar |
XRM2md | mesiodistal dimension of the right maxillary second molar |
XRM2mbl | buccolingual dimension across the mesial cusp pairs, right maxillary second molar |
XRM2dbl | buccolingual dimension across the distal cusp pairs, right maxillary second molar |
XRM3md | mesiodistal dimension of the right maxillary third molar |
XRM3mbl | buccolingual dimension across the mesial cusp pairs, right maxillary third molar |
XRM3dbl | buccolingual dimension across the distal cusp pairs, right maxillary third molar |
LM3md | mesiodistal dimension of the left mandibular third molar |
LM3mbl | buccolingual dimension across the mesial cusps of the left mandibular third molar |
LM3dbl | buccolingual dimension across the distal cusps of the left mandibular third molar |
LM3et | radial enamel thickness of the left mandibular third molar protoconid |
LM2md | mesiodistal dimension of the left mandibular second molar |
LM2mbl | buccolingual dimension across the mesial cusps of the left mandibular second molar |
LM2dbl | buccolingual dimension across the distal cusps of the left mandibular second molar |
LM2et | radial enamel thickness of the left mandibular second molar protoconid |
LM1md | mesiodistal dimension of the left mandibular first molar |
LM1mbl | buccolingual dimension across the mesial cusps of the left mandibular first molar |
LM1dbl | buccolingual dimension across the distal cusps of the left mandibular first molar |
LM1et | radial enamel thickness of the left mandibular third molar protoconid |
LP4md | mesiodistal dimension of the left mandibular fourth premolar |
LP4bl | buccolingual dimension of the left mandibular fourth premolar |
LP3md | mesiodistal dimension of the left mandibular third premolar (main axis of the tooth, not measured at an angle that follows the dental arcade) |
LP3bl | buccolingual dimension of the left mandibular third premolar (measured perpendicular to the md dimension) |
LCmd | mesiodistal dimension of the left mandibular canine base (main axis of the tooth, not measured at an angle that follows the dental arcade) |
LCbl | buccolingual dimension of the left mandibular canine base (measured perpendicular to the md dimension) |
LI2md | maximum mesiodistal dimension of the left mandibular second incisor |
LI2bl | maximum buccolingual dimension from the occlusal view of the left mandibular second incisor |
LI1md | maximum mesiodistal dimension of the left mandibular central incisor |
LI1bl | maximum buccolingual dimension from the occlusal view of the left mandibular central incisor |
RI1md | maximum mesiodistal dimension of the right mandibular central incisor |
RI1bl | maximum buccolingual dimension from the occlusal view of the right mandibular central incisor |
RI2md | maximum mesiodistal dimension of the right mandibular second incisor |
RI2bl | maximum buccolingual dimension from the occlusal view of the right mandibular second incisor |
RCmd | mesiodistal dimension of the right mandibular canine base (the main axis of the tooth, not measured at an angle that follows the dental arcade) |
RCbl | buccolingual dimension of the right mandibular canine base (measured perpendicular to the md dimension) |
RP3md | mesiodistal dimension of the right mandibular third premolar (main axis of the tooth, not measured at an angle that follows the dental arcade) |
RP3bl | buccolingual dimension of the right mandibular third premolar (measured perpendicular to the md dimension) |
RP4md | mesiodistal dimension of the right mandibular fourth premolar |
RP4bl | buccolingual dimension of the right mandibular fourth premolar |
RM1md | mesiodistal dimension of the right mandibular first molar |
RM1mbl | buccolingual dimension across the mesial cusps of the right mandibular first molar |
RM1dbl | buccolingual dimension across the distal cusps of the right mandibular first molar |
RM1et | radial enamel thickness of the right mandibular first molar protoconid |
RM2md | mesiodistal dimension of the right mandibular second molar |
RM2mbl | buccolingual dimension across the mesial cusps of the right mandibular second molar |
RM2dbl | buccolingual dimension across the distal cusps of the right mandibular second molar |
RM2et | radial enamel thickness of the right mandibular second molar protoconid |
RM3md | mesiodistal dimension of the right mandibular third molar |
RM3mbl | buccolingual dimension across the mesial cusps of the right mandibular third molar |
RM3dbl | buccolingual dimension across the distal cusps of the right mandibular third molar |
RM3et | radial enamel thickness of the right mandibular third molar protoconid |
Sharing/Access information
All of the linear metrics are shared in this dataset, even though only the data for the second molars were analyzed in Hlusko and Mahaney (2007).
Methods
L.J. Hlusko collected these data in Nairobi at the National Museums of Kenya in 2002 and 2003 using fixed-jawed dental calipers (Mitutoyo© Model NTD12-6″C). Each measurement was collected two or three times (three times if the data were collected in 2002, and twice if they were collected in 2003), and the average of those two measurements is presented here. A total of 82 linear dimensions were measured for each individual, although the full set of 82 measurements was not possible to take from all individuals.
Mesiodistal and buccolingual dimensions follow standard definitions. The mandibular molar protoconid radial enamel thickness follows the protocol developed in
- Hlusko, L.J., Suwa, G., Kono, R.T. and Mahaney, M.C., 2004. Genetics and the evolution of primate enamel thickness: a baboon model. American Journal of Physical Anthropology: The Official Publication of the American Association of Physical Anthropologists, 124(3), pp.223-233. https://doi.org/10.1002/ajpa.10353