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OBJECTIVES: Contemporary migrations show form and intensity of interaction between homeland and host communities to shape social dynamics and identities. We apply here a contemporary theoretical framework and biogeochemical analyses to elucidate the scale, processes, and impacts of migration in the Tiwanaku polity (6th-11th c. CE) by inferring the mobility of individuals interred at the Tiwanaku-affiliated site of Omo M10 (Moquegua Valley, Peru). MATERIALS AND METHODS: For each of 124 individuals, we captured paleomobility across the life-course by analyzing up to four enamel and bone samples that formed during discrete developmental periods for radiogenic strontium (87Sr/86Sr) and stable oxygen (δ18Ocarbonate(VPDB)) isotopes. RESULTS: At Omo M10, archaeological human enamel and bone values range from 87Sr/86Sr = 0.70632-0.72183 and δ18Ocarbonate(VPDB) = -13.4‰ to +1.7‰, with a mean of 87Sr/86Sr = 0.70763 ± 0.00164 (1σ, n = 334) and δ18O = -7.8‰ ± 1.9‰ (1σ, n = 334). DISCUSSION: Together with archaeological evidence, we interpret these data as evidence for multigenerational interaction between communities in the high-altitude Tiwanaku heartland and at the site of Omo M10. Our results suggest that one-fourth of individuals spent some part of their life outside of Moquegua and one in eight individuals from Omo M10 were first-generation migrants. Greater mobility of females and juveniles at Omo M10 indicates that gender and family were important social constructs in maintaining relationships and cultural continuity in provincial Tiwanaku life, and communities maintained autochthonous migration streams with Tiwanaku-affiliated populations throughout the south-central Andes. Intra-individual biogeochemical analyses of migration at Omo M10 contribute a nuanced perspective on the diverse experiences of multigenerational Tiwanaku colonies.

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The south central Andes is known as a region of enduring multiethnic diversity, yet it is also the cradle of one the South America's first successful expansive-state societies. Social structures that encouraged the maintenance of separate identities among coexistent ethnic groups may explain this apparent contradiction. Although the early expansion of the Tiwanaku state (A.D. 600-1000) is often interpreted according to a centralized model derived from Old World precedents, recent archaeological research suggests a reappraisal of the socio-political organization of Tiwanaku civilization, both for the diversity of social entities within its core region and for the multiple agencies behind its wider program of agropastoral colonization. Tiwanaku's sociopolitical pluralism in both its homeland and colonies tempers some of archaeology's global assumptions about the predominant role of centralized institutions in archaic states.

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OBJECTIVES: Gender and other facets of social identity play important roles in the organization of complex societies. This study reconstructs dietary practices within the Middle Horizon (AD 500-1000) Tiwanaku colonies in southern Peru to increase our knowledge of gendered patterns of consumption within this early expansive state. METHODS: We use stable isotope analysis of 43 human bone samples representing 14 females, 20 males, 8 juveniles, and 1 indeterminate individual recovered from burial excavations at the sites of Rio Muerto and Omo in the Moquegua Valley. Data are contextualized by comparisons with previously published Tiwanaku isotope data from the period. RESULTS: Our results find mean values of δ(13) Capatite = -7.3 ± 1.6% (N = 36, 1SD), δ(13) Ccollagen = -12.3 ± 1.5% (N = 43, 1SD), and δ(15) Ncollagen = 8.4 ± 1.6% (N = 43, 1SD). Between the sexes, Mann-Whitney U tests demonstrate significant differences in δ(13) Ccollagen (U = 74, P = 0.021), but no differences in δ(13) Capatite (U = 58, P = 0.095) or δ(15) Ncollagen (U = 116, P = 0.755) values. CONCLUSIONS: These data indicate relatively high C4 plant consumption among the Tiwanaku colonies, and support paleobotanical and archaeological evidence that maize (Zea mays) was the staple crop. Dietary values are similar overall between the sexes, but significantly higher δ(13) Ccollagen values in males is consistent with a model of gendered norms of consumption similar to that of the later Inca (AD 1438-1533), where males consumed more maize than females, often in the form of beer (chicha). Results provide new insights on social dynamics within the Tiwanaku colonies and suggest the increased importance maize consumption for males during the Tiwanaku expansion.

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Paleomobility has been a key element in the study of the expansion of ancient states and empires, including the Tiwanaku polity of the South Central Andes (AD 500-1000). We present radiogenic strontium and oxygen isotope data from human burials from three cemeteries in the Tiwanaku-affiliated Middle Horizon archaeological site complex of Rio Muerto in the Moquegua Valley of southern Peru. At Rio Muerto, archaeological human enamel and bone values range from (87) Sr/(86) Sr = 0.70657-0.72018, with a mean of (87) Sr/(86) Sr = 0.70804 ± 0.00207 (1σ, n = 55). For the subset of samples analyzed for oxygen isotope values (n = 48), the data ranges from δ(18) Ocarbonate(VSMOW) = +18.1 to +27.0‰. When contextualized with other lines of archaeological evidence, we interpret these data as evidence for an archaeological population in which the majority of individuals had "local" origins, and were likely second-generation, or more, immigrants from the Tiwanaku heartland in the altiplano. Based on detailed life history data, we argue a smaller number of individuals came at different ages from various regions within the Tiwanaku polity. We consider whether these individuals with isotopic values consistent with "nonlocal" geographic origins could represent first-generation migrants, marriage exchange partners, or occupationally mobile herders, traders or other travelers. By combining isotopic life history studies with mortuary treatment data, we use a person-centered migration history approach to state integration and expansion. Isotopic analyses of paleomobility at the Rio Muerto site complex contribute to the role of diversity in ancient states by demonstrating the range of geographic origins rather than simply colonists from the Lake Titicaca Basin.

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