article sur le régime de nos ancêtres

Cacahuète

Cacahuète

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Un peu de science pour discuter de l'argument " Les hommes préhistoriques mangaient des énormes cuisses de gazelles"

http://www.nature.com/nature/journal/vaop/ncurrent/full/nature11349.html?WT.ec_id=NATURE-20120809

L'article est assez compliqué, mais ce que j'ai compris:
- On en sait encore pas grand chose dans le domaine de la nutrition des hommes préhistoriques, en gros ils analyses des isotopes de 3 à 7 squelettes pour ces résultats... (Donc la probabilité est non nulle qu'ils se trompent sur leurs conclusions, mais je leur accorde que trouver des squelettes c'est pas évident!)
- Les Australopithèques avaient un régime diversifié un régime végétal + viande
Ceux-ci se sont ensuite divisés en 2 genres:
- les hominidés du genre Paranthropus (maintenant éteint) avait un régime plus spécifiquement d'origine végétale
- nos ancêtres du genre Homo semblent avoir un régime également plus spécifique, mais davantage carné :whistle:

Qui pense être un enfant caché de Paranthropus?? :)
Si quelqu'un est super intéressé et n'a pas accès à l'article complet, je peux l'envoyer en pdf.
Ici les conclusions:

The diet of A. africanus has a high Sr/Ca and a low Ba/Ca ratio, but a monotonous consumption of a Sr-enriched and Ba-depleted diet would not have produced the observed high intra-tooth Sr/Ca and Ba/Ca variability of A. africanus. It is more likely that the diet of A. africanus resulted from the combination of two distinct dietary sources. An association of woody plants represented by leaves and fruits of trees and bushes, which are Sr-enriched and Ba-depleted4, and meat, which is both Sr- and Ba-depleted, could explain the enamel Sr/Ca and Ba/Ca patterns of A. africanus. Woody plants and meat products could have been consumed alternately by A. africanus on a seasonal scale. This is regarded as the most probable dietary association for the genus Australopithecus because it is the only way to reconcile conflicting results based on tooth morphology19, dental microwear2 and carbon isotope ratios20. This scenario is compatible with the idea of fallback resource use, by which it is proposed that food items of poor nutritional quality become an increasing food component as preferred foods become rare21, 22. However, at this stage, it is not possible to state whether the fallback food was the woody plant or the meat component.

The diet of P. robustus seems to have been less variable than that of A. africanus and was mainly based on woody plant foodstuffs. This is consistent with the measured average Sr/Ca and Ba/Ca ratios, which are indistinguishable from browsers, the reduced intra-tooth Sr/Ca and Ba/Ca ratio variability, and with dental microwear and tooth morphology data2, 23. Similar to P. robustus, the diet of early Homo was less variable than that of A. africanus, but contrary to the diet of P. robustus, it was based more on meat products. Our results support the idea that the degree by which woody plants and underground storage organs21 were consumed by A. africanus was reduced in the Homo lineage, whereas the more specialized masticatory apparatus of the robust australopithecines enabled them to have subsisted mostly on this type of food. However, this constitutes a South African scenario for which the diet of the Homo-like australopith A. sediba remains to be tested24.
Cliquez pour agrandir...
 
C'est sur qu'analyser seulement 3 à 5 squelettes... Si dans 3000 ans, les futurs chercheurs analysent 3 à 5 squelettes de personnes qui se trouvent être mortes pendant un pique-nique végé, ils vont avoir de fausses idées sur le régime alimentaire de la majorité de la population. ^^
 
Mais… On dirait mon papy.
 
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