Differences in dietary habits between papionins and hominins from the Shungura Formation, Ethiopia: evidence from an improved Dental Microwear Texture Analysis based on surface sampling on phases I and II molar facets - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

Differences in dietary habits between papionins and hominins from the Shungura Formation, Ethiopia: evidence from an improved Dental Microwear Texture Analysis based on surface sampling on phases I and II molar facets

Résumé

The fossil record from the Shungura Formation includes several primates with terrestrial habits. By the means of a modified Dental Microwear Texture Analysis, we aim at deciphering at best how papionins and hominins have shared resources. We here integrate both shearing and crushing facets for every individual and take into account variations for all texture parameters over a given surface. The sampling strategy allows to generate n sub-surfaces and thus n values per surface for each of 17 parameters. From those latter, 16 statistics (mean, quartiles, kurtosis ...) are produced generating thus 272 variables per surface. From a routine, the most significant statistic per parameter and facet type from a modern Ethiopian monkeys dataset (n=104; Theropithecus gelada, Papio hamadryas, Chlorocebus aethiops, Colobus guereza) are used to generate a Principal Component Analysis. Height parameters on both crushing and shearing facets explain most of the variance along PC1 (48.2%) and PC2 (13.2%) whereas spatial parameters notably on shearing facets contribute to PC3 (10%) and PC4 (8.3%). Combined with ANOVAs on PC coordinates, this approach discriminates more significantly these monkeys than earlier studies. Fossil specimens are inserted as supplementary data. The extinct specimens of Theropithecus (N=165) and Papio (N=65) plot next to their modern relatives. The three genera of hominins (N= 32) plot next to the modern Theropithecus, suggesting that contrary to the contemporaneous Papio, none of them integrated hard, but either soft or tough food items. However, Australopithecus differs from Paranthropus and Homo in having more complex texture on crushing facets.

Domaines

Paléontologie
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Dates et versions

hal-02310032 , version 1 (09-10-2019)

Identifiants

  • HAL Id : hal-02310032 , version 1

Citer

Florian Martin, Chris-Alexander Plastiras, Auria Kallend, Arthur Francisco, Jean-Renaud Boisserie, et al.. Differences in dietary habits between papionins and hominins from the Shungura Formation, Ethiopia: evidence from an improved Dental Microwear Texture Analysis based on surface sampling on phases I and II molar facets. 88th Annual Meeting of the American Association of Physical Anthropologists, Apr 2017, New-Orleans, United States. pp.156. ⟨hal-02310032⟩
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