Violence in fishing, hunting, and gathering societies of the Atacama Desert coast: A long-term perspective (10,000 BP—AD 1450)

In this study, we examine the long-term trajectory of violence in societies that inhabited the coast of the Atacama Desert in northern Chile using three lines of evidence: bioarchaeology, geoarchaeology and socio-cultural contexts (rock art, weapons, and settlement patterns). These millennia-old populations adopted a way of life, which they maintained for 10,000 years, based on fishing, hunting, and maritime gathering, complementing this with terrestrial resources. We analyzed 288 adult individuals to search for traumas resulting from interpersonal violence and used strontium isotopes 87Sr/86Sr as a proxy to evaluate whether individuals that showed traces of violence were members of local or non-local groups. Moreover, we evaluated settlement patterns, rock art, and weapons. The results show that the violence was invariant during the 10,000 years in which these groups lived without contact with the western world. During the Formative Period (1000 BC-AD 500), however, the type of violence changed, with a substantial increase in lethality. Finally, during the Late Intermediate Period (AD 1000–1450), violence and lethality remained similar to that of the Formative Period. The chemical signal of Sr shows a low frequency of individuals who were coastal outsiders, suggesting that violence occurred between local groups. Moreover, the presence of weapons and rock art depicting scenes of combat supports the notion that these groups engaged in violence. By contrast, the settlement pattern shows no defensive features. We consider that the absence of centralized political systems could have been a causal factor in explaining violence, together with the fact that these populations were organized in small-scale grouping. Another factor may have been competition for the same resources in the extreme environments of the Atacama Desert. Finally, from the Formative Period onward, we cannot rule out a certain level of conflict between fishers and their close neighbors, the horticulturalists

Ancient mitochondrial DNA provides high-resolution time scale of the peopling of the Americas

The exact timing, route, and process of the initial peopling of the Americas remains uncertain despite much research. Archaeological evidence indicates the presence of humans as far as southern Chile by 14.6 thousand years ago (ka), shortly after the Pleistocene ice sheets blocking access from eastern Beringia began to retreat. Genetic estimates of the timing and route of entry have been constrained by the lack of suitable calibration points and low genetic diversity of Native Americans. We sequenced 92 whole mitochondrial genomes from pre-Columbian South American skeletons dating from 8.6 to 0.5 ka, allowing a detailed, temporally calibrated reconstruction of the peopling of the Americas in a Bayesian coalescent analysis. The data suggest that a small population entered the Americas via a coastal route around 16.0 ka, following previous isolation in eastern Beringia for ~2.4 to 9 thousand years after separation from eastern Siberian populations. Following a rapid movement throughout the Americas, limited gene flow in South America resulted in a marked phylogeographic structure of populations, which persisted through time. All of the ancient mitochondrial lineages detected in this study were absent from modern data sets, suggesting a high extinction rate. To investigate this further, we applied a novel principal components multiple logistic regression test to Bayesian serial coalescent simulations. The analysis supported a scenario in which European colonization caused a substantial loss of pre-Columbian lineages

Possible influence of the ENSO phenomenon on the pathoecology of diphyllobothriasis and anisakiasis in ancient Chinchorro populations

Current clinical data show a clear relationship between the zoonosis rates of Diphyllobothrium pacificum and Anisakis caused by the El Niño Southern Oscillations (ENSO) phenomenon along the Chilean coast. These parasites are endemic to the region and have a specific habitat distribution. D. pacificum prefers the warmer waters in the northern coast, while Anisakis prefers the colder waters of Southern Chile. The ENSO phenomenon causes a drastic inversion in the seawater temperatures in this region, modifying both the cool nutrient-rich seawater and the local ecology. This causes a latitudinal shift in marine parasite distribution and prevalence, as well as drastic environmental changes. The abundance of human mummies and archaeological coastal sites in the Atacama Desert provides an excellent model to test the ENSO impact on antiquity. We review the clinical and archaeological literature debating to what extent these parasites affected the health of the Chinchorros, the earliest settlers of this region. We hypothesise the Chinchorro and their descendants were affected by this natural and cyclical ENSO phenomenon and should therefore present fluctuating rates of D. pacificum and Anisakis infestations

Geoglifos y tráfico prehispánico de caravanas de llamas en el Desierto de Atacama (Norte de Chile)

This study brings new empirical evidence, resulting from the excavation of four transitory camp sites and two human burials associated with geoglyphs, and found along a prehispanic caravan path of 150 km long, connecting the Pica oasis with the Pacific coastal ocean in the Atacama desert in northern Chile. Since the majority of these sites are found in resourceless desertic areas and are associated to contexts such as llama coprolites and corn leaves, we argue that these sites were direct components of caravan trafficking. This route was linked to an intensive long distance macro-regional traffic associated with the circulations of economic and sumptuary goods from diverse origins, including the selva, altiplano, oasis, pampa and coast. Radiocarbon dates obtained at the excavations indicate that even though most of the geoglyphs were created during the Desarrollo Regional period (900-1,450 yrs. A.D.) some transdesertic routes were already used, from at least the Late Archaic Period (1,300 B.C.) by hunters, fishers and gatherersEste estudio aporta nuevos antecedentes empíricos, resultado de las excavaciones de cuatro campamentos de uso transitorio y dos entierros humanos, asociados a sitios con geoglifos, ubicados a lo largo de una ruta caravanera prehispánica de 150 km, que conectó a los oasis de Pica con la costa del océano Pacífico. Puesto que la mayoría de estos sitios se encuentra en territorios desérticos sin recursos, asociados a contextos tales como coprolitos de llamas y hojas de maíces, argumentamos que fueron componentes directos del tráfico caravanero. Esta ruta estuvo vinculada al intenso tráfico macrorregional de larga distancia por donde circulaban bienes económicos y suntuarios procedentes de los más diversos ambientes (selva-altiplano-oasis-pampa-costa). Las seis dataciones de radiocarbono, obtenidas de los contextos excavados, indicarían que, si bien la mayoría de los geoglifos de la transecta de estudio fueron elaborados durante el período del Desarrollo Regional (900-1.450 años d.C.), ciertas rutas transdesérticas ya estaban en uso, al menos desde el Arcaico Tardío (1.300 años a.C.), por parte de cazadores, pescadores y recolectore