Common Millennia
Consumption patterns in prehistoric Europe are consistent with modern economic behaviour
Nicola Ialongo & Giancarlo Lago
Nature Human Behaviour, forthcoming
Abstract:
Have humans always sold and purchased things? This seemingly trivial question exposes one of the most conspicuous blind spots in our understanding of cultural evolution: the emergence of what we perceive today as ‘modern’ economic behaviour. Here we test the hypothesis that consumption patterns in prehistoric Europe (around 2300–800 BCE) can be explained by standard economic theory, predicting that everyday expenses are log-normally distributed and correlated to supply, demand and income. On the basis of a large database of metal objects spanning northern and southern Europe (n = 23,711), we identify metal fragments as money, address them as proxies of consumption and observe that, starting around 1500 BCE, their mass values become log-normally distributed. We simulate two alternative scenarios and show that: (1) random behaviour cannot produce the distributions observed in the archaeological data and (2) modern economic behaviour provides the best-fitting model for prehistoric consumption.
Are there fitness benefits to violence? The case of medieval Iceland
Robin Dunbar & Anna Wallette
Evolution and Human Behavior, September 2024
Abstract:
Males that behave violently to achieve social and reproductive objectives are a widespread phenomenon among mammals, as well as humans. Because this kind of behaviour can be socially very disruptive, its continued survival in human populations, in particular, remains a puzzle. We use historical data on the pedigrees of medieval Icelandic Vikings to test the hypothesis that males who killed had higher fitness than other males. Whereas most studies that examine the evolutionary benefits of behaviour focus on the numbers of offspring sired, in this paper we measure fitness more directly in terms of the number of grandchildren produced both directly and indirectly via collateral relatives, as well as determining the costs of pursuing alternative strategies in terms of experienced mortality rates. We show that, on average, killers gain a very significant fitness advantage despite the often high costs they pay and, more importantly, that they had a dramatic effect on the fitness of their male kin. We suggest that such behaviour represents a phenotypic, rather than genetic, response to opportunities provided by local circumstances.
Recurrent evolution and selection shape structural diversity at the amylase locus
Davide Bolognini et al.
Nature, forthcoming
Abstract:
The adoption of agriculture triggered a rapid shift towards starch-rich diets in human populations. Amylase genes facilitate starch digestion, and increased amylase copy number has been observed in some modern human populations with high-starch intake, although evidence of recent selection is lacking. Here, using 94 long-read haplotype-resolved assemblies and short-read data from approximately 5,600 contemporary and ancient humans, we resolve the diversity and evolutionary history of structural variation at the amylase locus. We find that amylase genes have higher copy numbers in agricultural populations than in fishing, hunting and pastoral populations. We identify 28 distinct amylase structural architectures and demonstrate that nearly identical structures have arisen recurrently on different haplotype backgrounds throughout recent human history. AMY1 and AMY2A genes each underwent multiple duplication/deletion events with mutation rates up to more than 10,000-fold the single-nucleotide polymorphism mutation rate, whereas AMY2B gene duplications share a single origin. Using a pangenome-based approach, we infer structural haplotypes across thousands of humans identifying extensively duplicated haplotypes at higher frequency in modern agricultural populations. Leveraging 533 ancient human genomes, we find that duplication-containing haplotypes (with more gene copies than the ancestral haplotype) have rapidly increased in frequency over the past 12,000 years in West Eurasians, suggestive of positive selection. Together, our study highlights the potential effects of the agricultural revolution on human genomes and the importance of structural variation in human adaptation.
The role of emerging elites in the formation and development of communities after the fall of the Roman Empire
Yijie Tian et al.
Proceedings of the National Academy of Sciences, 3 September 2024
Abstract:
Elites played a pivotal role in the formation of post-Roman Europe on both macro- and microlevels during the Early Medieval period. History and archaeology have long focused on their description and identification based on written sources or through their archaeological record. We provide a different perspective on this topic by integrating paleogenomic, archaeological, and isotopic data to gain insights into the role of one such elite group in a Langobard period community near Collegno, Italy dated to the 6-8th centuries CE. Our analysis of 28 newly sequenced genomes together with 24 previously published ones combined with isotope (Sr, C, N) measurements revealed that this community was established by and organized around a network of biologically and socially related individuals likely composed of multiple elite families that over time developed into a single extended pedigree. The community also included individuals with diverse genetic ancestries, maintaining its diversity by integrating newcomers and groups in later stages of its existence. This study highlights how shifts in political power and migration impacted the formation and development of a small rural community within a key region of the former Western Roman Empire after its dissolution and the emergence of a new kingdom. Furthermore, it suggests that Early Medieval elites had the capacity to incorporate individuals from varied backgrounds and that these elites were the result of (political) agency rather than belonging to biologically homogeneous groups.
Accommodating agriculture at al-Khayran: Economic relations and settlement practices in the earliest agricultural communities of the southern Levant
Matthew Kroot
Journal of Anthropological Archaeology, September 2024
Abstract:
Early agricultural practices are often viewed as such a radical transformation that they not only structured and drove the long-term development of subsistence economies, but also required a dramatic reorganization of how community-wide economic relations were reckoned and enacted. This article examines how data derived from loci of economic production can inform us about the structure of economic relations in early agricultural communities, so as to better test such claims of political-economic disruption against the archaeological record. It does so by analyzing the site of al-Khayran in the west-central Jordan. Al-Khayran dates to the southern Levantine Middle Pre-Pottery Neolithic B, the time period when predominantly agricultural economies first emerge in the region. Results show that a typical village-based residential group temporarily and repeatedly inhabited a substantially-built in-field structure while practicing intensive agricultural production. These results indicate that the site’s inhabitants carried out a form of dual residence mobility with heavy investment on-site in perimetrics via landesque capital. Such behavior suggests that at least some residential groups in this time period were indeed corporate groups that agentively intervened in economic systems to actively assert and enact the private holding of the means of production during the emergence of agricultural economies.
Ancient DNA sheds light on the funerary practices of late Neolithic collective burial in southern France
Ana Arzelier et al.
Proceedings of the Royal Society: Biological Sciences, August 2024
Abstract:
The Aven de la Boucle (Corconne, Gard, southern France) is a karst shaft used as a collective burial between 3600 and 2800 cal BCE. The site encompasses the skeletal remains of approximately 75 individuals comprising a large majority of adult individuals, represented by scattered and commingled remains. To date, few studies have explored the potential of ancient DNA to tackle the documentation of Neolithic collective burials, and the funerary selection rules within such structures remain largely debated. In this study, we combine genomic analysis of 37 individuals with archaeo-anthropological data and Bayesian modelling of radiocarbon dates. Through this multidisciplinary approach, we aim to characterize the identity of the deceased and their relationships, as well as untangle the genetic diversity and funerary dynamics of this community. Genomic results identify 76% of male Neolithic individuals, suggesting a marked sex-biased selection. Available data emphasize the importance of biological relatedness and a male-mediated transmission of social status, as the affiliation to a specific male-lineage appears as a preponderant selection factor. The genomic results argue in favour of ‘continuous’ deposits between 3600 and 2800 BCE, carried out by the same community, despite cultural changes reflected by the ceramic material.
Stable Isotope Analysis and Chronology Building at the Hokfv-Mocvse Cultural Site, the Earliest Evidence for South Atlantic Shell-Ring Villages
Carey Garland et al.
American Antiquity, forthcoming
Abstract:
Circular shell rings along the South Atlantic coast of the United States are vestiges of the earliest sedentary villages in North America, dating to 4500–3000 BP. However, little is known about when Indigenous communities began constructing these shell-ring villages. This article presents data from the Hokfv-Mocvse Shell Ring on Ossabaw Island, Georgia. Although shell rings are often associated with the earliest ceramics in North America, no ceramics were encountered in our excavations at Hokfv-Mocvse, and the only materials recovered were projectile points similar to points found over 300 km inland. Bayesian modeling of radiocarbon dates indicates that the ring was occupied between 5090 and 4735 cal BP (95% confidence), making it the earliest dated shell ring in the region. Additionally, shell geochemistry and oyster paleobiology data suggest that inhabitants were living at the ring year-round and had established institutions at that time to manage oyster fisheries sustainably. Hokfv-Mocvse therefore provides evidence for Indigenous people settling in year-round villages and adapting to coastal environments in the region centuries before the adoption of pottery. The establishment of villages marks a visible archaeological shift toward settling down and occupying island ecosystems on a more permanent basis and in larger numbers than ever before in the region.
Dogs under urbanization: Isotopic insight from the Bronze Age Central Plains of China (ca. 2000–1000 BCE)
Xinyi Ouyang et al.
Journal of Anthropological Archaeology, September 2024
Abstract:
Although dogs played multifaceted roles during the early stages of urbanization in China’s Central Plains, research remains limited concerning the management of dogs, the dynamics of human–dog relationships, and dogs’ entanglements with the political economy, ritual, and daily life. Here, we compare stable carbon and nitrogen isotope data from 95 dogs and associated human skeletons from 15 Late Neolithic – Bronze Age sites. Results show two distinct dietary patterns in dogs. Early sites (Xinzhai-Erlitou period, 1900–1520 BCE) show more variability in dog diets, indicative of looser approaches to dog management. Later sites (Late Shang-Western Zhou periods, 1320–770 BCE) show a widespread, homogeneous diet among dogs characterized by higher consumption of C4 millet (greater than in humans’ diets), suggesting the possibility of the emergence of specialized, broadly shared dog management practices linked to increased ritual use of dogs. This study also underscores the complexity of management practices, which would have been influenced by site-specific conditions, including environment and available resources, the site’s position in hierarchical settlement networks, and the varying roles of the dogs. Importantly, this study demonstrates that the comparison of isotopic data from broad temporal and spatial contexts can shed light on animal management practices in early urban economic systems and political economies.