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    Preadult diets in prehistoric Lima: Stable isotopes from Huaca 20 (620–780 CE), Maranga Complex, Peru
    (Elsevier Ltd, 2024-10-01)
    Using stable isotope and Bayesian Mixing Models, this study aims to understand the preadult dietary patterns of human individuals from Huaca 20 (H20, 620–780 CE), a residential sector of the main urban center in the lower Rimac Valley of the Peruvian Central Coast. Due to preservation issues, a practical approach was employed to understand the diet of this population, using data for δ13C and δ15N obtained from the dentine of anatomic tooth segments of 20 adult individuals, which were analyzed by sex and broad life-stages (i.e., infant, child, adolescent). We then conducted individual paleodietary reconstructions using a Bayesian Mixing Model to obtain the quantitative contribution of four food groups. The results indicate that this population relied on a mixed diet mainly composed of C4 (maize) and C3 resources complemented with marine protein in variable proportions, and minimal contributions of terrestrial protein. Maize and C3 resources were the main foods during infancy and childhood of these adults, whereas the diet during adolescence shows more marine protein, possibly more similar to the adult diet of this community. This isotopic evidence from Huaca 20 suggests the use of specific infant feeding strategies.
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    Identifying communal interaction and mobility in the peruvian central coast through strontium isotope analysis of human individuals in Huaca 20
    (Elsevier Ltd, 2025-02-01)
    We present the results of strontium isotope analysis conducted on human individuals recovered at the Huaca 20 sector of the Maranga Complex; a Late Lima settlement of the Lower Rimac Valley that flourished during the Middle Horizon Epoch 1 (600–800 CE). Our aim is to evaluate the diversity of the Huaca 20 population through an integrated approach that combines contextual analysis of burials’ associations, the bioarchaeological characterization of the buried individuals and the acquisition of 87Sr/86Sr compositions of individuals’ tooth enamel to explore early-life values and probable geographic origins. Our results reveal a scenario of a mainly local population with a minority of foreign individuals that suggest mobility consistent with post marital residential patterns. The lack of correlation between individual's origins and a diversity of burial practices and associations (as for example, foreign umber ware ceramics) suggests that mobility might have occurred as a continuous phenomenon, which resulted in a cosmopolitan population, generated under regional interactions that occurred beyond elite control.
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