Genome-wide data from medieval German Jews show that the Ashkenazi founder event pre-dated the 14th century

We report genome-wide data from 33 Ashkenazi Jews (AJ), dated to the 14th century, obtained following a salvage excavation at the medieval Jewish cemetery of Erfurt, Germany. The Erfurt individuals are genet-ically similar to modern AJ, but they show more variability in Eastern European-related ancestry than mod-ern AJ. A third of the Erfurt individuals carried a mitochondrial lineage common in modern AJ and eight carried pathogenic variants known to affect AJ today. These observations, together with high levels of runs of homozygosity, suggest that the Erfurt community had already experienced the major reduction in size that affected modern AJ. The Erfurt bottleneck was more severe, implying substructure in medieval AJ. Overall, our results suggest that the AJ founder event and the acquisition of the main sources of ancestry pre-dated the 14th century and highlight late medieval genetic heterogeneity no longer present in modern AJ.The study was funded by the Israel Science Foundation grant 407/17 and the United States-Israel Binational Science Foundation grant 2017024 to S.C., by the National Science Foundation (USA) grants 1912776 and 0922374 to V.R., by the MCIN/AEI/10.13039/501100011033 and by "ESF Investing in your future" grant "Ayudas para contratos Ramon y Cajal" to I.O., and by the following grants to D.R.: NIH grants GM100233 and HG012287; the Allen Discovery Center program, a Paul G. Allen Frontiers Group advised program of the Paul G. Allen Family Foundation; John Templeton Foundation grant 61220; a private gift from Jean-Francois Clin; and the Howard Hughes Medical Institute

Ancient Lowland Maya neighborhoods: Average Nearest Neighbor analysis and kernel density models, environments, and urban scale

Many humans live in large, complex political centers, composed of multi-scalar communities including neighborhoods and districts. Both today and in the past, neighborhoods form a fundamental part of cities and are defined by their spatial, architectural, and material elements. Neighborhoods existed in ancient centers of various scales, and multiple methods have been employed to identify ancient neighborhoods in archaeological contexts. However, the use of different methods for neighborhood identification within the same spatiotemporal setting results in challenges for comparisons within and between ancient societies. Here, we focus on using a single method—combining Average Nearest Neighbor (ANN) and Kernel Density (KD) analyses of household groups—to identify potential neighborhoods based on clusters of households at 23 ancient centers across the Maya Lowlands. While a one-size-fits all model does not work for neighborhood identification everywhere, the ANN/KD method provides quantifiable data on the clustering of ancient households, which can be linked to environmental zones and urban scale. We found that centers in river valleys exhibited greater household clustering compared to centers in upland and escarpment environments. Settlement patterns on flat plains were more dispersed, with little discrete spatial clustering of households. Furthermore, we categorized the ancient Maya centers into discrete urban scales, finding that larger centers had greater variation in household spacing compared to medium-sized and smaller centers. Many larger political centers possess heterogeneity in household clustering between their civic-ceremonial cores, immediate hinterlands, and far peripheries. Smaller centers exhibit greater household clustering compared to larger ones. This paper quantitatively assesses household clustering among nearly two dozen centers across the Maya Lowlands, linking environment and urban scale to settlement patterns. The findings are applicable to ancient societies and modern cities alike; understanding how humans form multi-scalar social groupings, such as neighborhoods, is fundamental to human experience and social organization

Aerosol forcing of the position of the intertropical convergence zone since AD1550

The position of the intertropical convergence zone is an important control on the distribution of low-latitude precipitation. Its position is largely controlled by hemisphere temperature contrasts1, 2. The release of aerosols by human activities may have resulted in a southward shift of the intertropical convergence zone since the early 1900s (refs 1, 3, 4, 5, 6) by muting the warming of the Northern Hemisphere relative to the Southern Hemisphere over this interval1, 7, 8, but this proposed shift remains equivocal. Here we reconstruct monthly rainfall over Belize for the past 456 years from variations in the carbon isotope composition of a well-dated, monthly resolved speleothem. We identify an unprecedented drying trend since ad 1850 that indicates a southward displacement of the intertropical convergence zone. This drying coincides with increasing aerosol emissions in the Northern Hemisphere and also marks a breakdown in the relationship between Northern Hemisphere temperatures and the position of the intertropical convergence zone observed earlier in the record. We also identify nine short-lived drying events since ad 1550 each following a large volcanic eruption in the Northern Hemisphere. We conclude that anthropogenic aerosol emissions have led to a reduction of rainfall in the northern tropics during the twentieth century, and suggest that geographic changes in aerosol emissions should be considered when assessing potential future rainfall shifts in the tropics

Reconstructing the Deep Population History of Central and South America

We report genome-wide ancient DNA from 49 individuals forming four parallel time transects in Belize, Brazil, the Central Andes, and the Southern Cone, each dating to at least 9,000 years ago. The common ancestral population radiated rapidly from just one of the two early branches that contributed to Native Americans today. We document two previously unappreciated streams of gene flow between North and South America. One affected the Central Andes by 4,200 years ago, while the other explains an affinity between the oldest North American genome associated with the Clovis culture and the oldest Central and South Americans from Chile, Brazil, and Belize. However, this was not the primary source for later South Americans, as the other ancient individuals derive from lineages without specific affinity to the Clovis-associated genome, suggesting a population replacement that began at least 9,000 years ago and was followed by substantial population continuity in multiple regions

A Cognitive Approach to Artifact Distribution in Caves in the Maya Area

This volume gathers papers from twenty prominent Mesoamerican archaeologists, linguists, and ethnographers to present a state-of-the-art survey of ritual cave use in Mesoamerica from Pre-Columbian times to the present. Cave archaeology in the New World, now a focus of intense research, was still a peripheral area of inquiry just fifteen years ago. Stone Houses and Earth Lords is the first volume dedicated exclusively to the use of caves in the Maya Lowlands, covering primarily Classic Period archaeology from A.D. 100 through the Spaniards\u27 arrival. Although the caves that riddled the lowlands show no signs of habitation, most contain evidence of human use - evidence that suggests that they functioned as ritual spaces. Demonstrating the importance of these subterranean spaces to Maya archaeology, contributors provide interpretations of archaeological remains that yield insights into Maya ritual and cosmology. Compiling the best current scholarship in this fast-growing area of researc

The Geopolitics of Emerging Maya Rulers A Case Study of Kayuko Naj Tunich, a Foundational Shrine at Uxbenká, Southern Belize

Cross-culturally we find that emerging leaders in agrarian societies create ritual ties to the land as a political resource in gaining and maintaining political power. Based on research in ancient Maya caves, we argue that this strategy was followed by emerging Maya kings, who used ritual practice in caves to establish their relationships with deities associated with the earth and its resources. These rites bolstered their legitimacy, supported their right to rule, and established a natural political order. This is borne out both ethnohistorically and ethnographically, by examples in which caves figure prominently in the foundation of communities and in establishing geopolitical boundaries that serve to spiritually anchor leaders to the land by providing the most important ritual venue for the propitiation of local deities. In this paper we demonstrate that this practice has a deep history by examining an Early Classic cave site in southern Belize, Kayuko Naj Tunich, and argue that it served as a foundational shrine for the polity of Uxbenká

Constructing Mythic Space: The significance of a Chicomoztoc complex at Acatzingo Viejo

As portals to the supernatural realm that creates and animates the universe, caves have always been held sacred by the peoples of Mesoamerica. From ancient times to the present, Mesoamericans have made pilgrimages to caves for ceremonies ranging from rituals of passage to petitions for rain and a plentiful harvest. So important were caves to the pre-Hispanic peoples that they are mentioned in Maya hieroglyphic writing and portrayed in the Central Mexican and Oaxacan pictorial codices. Many ancient settlements were located in proximity to caves. This volume gathers papers from twenty prominent Mesoamerican archaeologists, linguists, and ethnographers to present a state-of-the-art survey of ritual cave use in Mesoamerica from Pre-Columbian times to the present. Organized geographically, the book examines cave use in Central Mexico, Oaxaca, and the Maya region. Some reports present detailed site studies, while others offer new theoretical understandings of cave rituals. As a whole, the collection validates cave study as the cutting edge of scientific investigation of indigenous ritual and belief. It confirms that the indigenous religious system of Mesoamerica was and still is much more terrestrially focused that has been generally appreciated