The diet at the onset of the Andean Civilization: New stable isotope data from Caral and Áspero, North-Central Coast of Peru

South American Archaeological Isotopic Database, a regional-scale multi-isotope data compendium for research

The South American Archaeological Isotopic Database (SAAID) is a comprehensive open-access resource that aggregates all available bioarchaeological stable and radiogenic isotope measurements, encompassing data from human individuals, animals, and plants across South America. Resulting from a collaborative effort of scholars who work with stable isotopes in this region, SAAID contains 53,781 isotopic measurements across 24,507 entries from individuals/specimens spanning over 12,000 years. SAAID includes valuable contextual information on archaeological samples and respective sites, such as chronology, geographical region, biome, and spatial coordinates, biological details like estimated sex and age for human individuals, and taxonomic description for fauna and flora. SAAID is hosted at the PACHAMAMA community within the Pandora data platform and the CORA repository to facilitate easy access. Because of its rich data structure, SAAID is particularly well-suited for conducting spatiotemporal meta-analyses. It serves as a valuable tool for addressing a variety of research topics, including the spread, adoption, and consumption intensification of food items, paleo-environmental reconstruction, as well as the exploration of mobility patterns across extensive geographic regions.

The role of farming and fishing in the rise of social complexity in the Central Andes: a stable isotope perspective

For many years, the rise of stratified societies along the Central Andean coast, known as the birthplace of Andean civilization, has been closely linked to a marine-oriented economy. This hypothesis has recently been challenged by increasing evidence of plant management and cultivation among Andean populations long before the emergence of complex societies and monumental architecture. The extent to which marine and plant-based economies were integrated and their contributions to early sedentism, population growth, and intra-community stratification, however, remain subjects of ongoing and contentious debate. Using Bayesian Mixing Models we reanalyze the previously published stable isotopes (δ15Ncollagen, δ13Ccollagen, δ13Capatite) values of 572 human individuals from 39 archaeological sites in the Central Andes dated between ca. 7000 BCE and 200 CE to reconstruct dietary regimes in probabilistic terms. Our results reveal that fish, terrestrial fauna, and cultivated plants variably contributed to the diet of prehistoric Andean populations; in coastal and middle valley settlements plant cultivation, not fishing, fueled the development of the earliest complex societies during the Formative Period (from 3000 BCE). Similarly, in the highlands the societies that built ceremonial centers show a plant-based economy. Our findings also show that maize only became a staple food (> 25% dietary contribution) in more recent phases of Andean prehistory, around 500 BCE.

Analysis of starch grains trapped in human dental calculus in Áspero, Peru during the Initial Formative Period (3000-1800 BCE)

The objective of this research is to identify the plants consumed and to determine their dietary importance in Áspero, an urban center on the coast of the Supe Valley, Peru. Consequently, starch grains trapped in the human dental calculus of nine individuals were recovered, while the results from one individual from the Sacred City of Caral, located in the interior of Supe Valley, are presented. Eight species of food plants were identified, among them C3 plants: sweet potato, squash, potato, chili pepper, algarrobo, manioc and bean and C4 plant: maize. Previous isotopic analysis indicates that C3 plants formed the foundation of the diet at Áspero and Caral. Our results indicate a high ubiquity of C3 plants like sweet potato (100%) and squash (90%) suggesting, with caution, that these taxa were an important C3 source in the menu. Maize, C4 plant, showed a similar ubiquity (100%) to sweet potato and squash, however, previous isotopic analysis indicate that maize was a marginal food in Áspero and Caral. These results support that the absence and abundance of starch grains cannot be employed to directly infer the frequency of intake of C3 and C4 plants within a small population, as suggested by previous studies.