Paleolithic to Bronze Age Siberians Reveal Connections with First Americans and across Eurasia.

Modern humans have inhabited the Lake Baikal region since the Upper Paleolithic, though the precise history of its peoples over this long time span is still largely unknown. Here, we report genome-wide data from 19 Upper Paleolithic to Early Bronze Age individuals from this Siberian region. An Upper Paleolithic genome shows a direct link with the First Americans by sharing the admixed ancestry that gave rise to all non-Arctic Native Americans. We also demonstrate the formation of Early Neolithic and Bronze Age Baikal populations as the result of prolonged admixture throughout the eighth to sixth millennium BP. Moreover, we detect genetic interactions with western Eurasian steppe populations and reconstruct Yersinia pestis genomes from two Early Bronze Age individuals without western Eurasian ancestry. Overall, our study demonstrates the most deeply divergent connection between Upper Paleolithic Siberians and the First Americans and reveals human and pathogen mobility across Eurasia during the Bronze Age.

Analysis of biogeographic ancestry reveals complex genetic histories for indigenous communities of St. Vincent and Trinidad.

OBJECTIVES: From a genetic perspective, relatively little is known about how mass emigrations of African, European, and Asian peoples beginning in the 16th century affected Indigenous Caribbean populations. Therefore, we explored the impact of serial colonization on the genetic variation of the first Caribbean islanders. MATERIALS AND METHODS: Sixty-four members of St. Vincent's Garifuna Community and 36 members of Trinidad's Santa Rosa First People's Community (FPC) of Arima were characterized for mitochondrial DNA and Y-chromosome diversity via direct sequencing and targeted SNP and STR genotyping. A subset of 32 Garifuna and 18 FPC participants were genotyped using the GenoChip 2.0 microarray. The resulting data were used to examine genetic diversity, admixture, and sex biased gene flow in the study communities. RESULTS: The Garifuna were most genetically comparable to African descendant populations, whereas the FPC were more similar to admixed American groups. Both communities also exhibited moderate frequencies of Indigenous American matrilines and patrilines. Autosomal SNP analysis indicated modest Indigenous American ancestry in these populations, while both showed varying degrees of African, European, South Asian, and East Asian ancestry, with patterns of sex-biased gene flow differing between the island communities. DISCUSSION: These patterns of genetic variation are consistent with historical records of migration, forced, or voluntary, and suggest that different migration events shaped the genetic make-up of each island community. This genomic study is the highest resolution analysis yet conducted with these communities, and provides a fuller understanding of the complex bio-histories of Indigenous Caribbean peoples in the Lesser Antilles.

["Human races": history of a dangerous illusion]. / Les "races humaines": histoire d'une illusion dangereuse.

The multiplication of offences prompted by racism and the increase of complaints for racism leads us to consider the illusory concept of "human races". This idea crossed the history, and was reinforced by the discovery of remote tribes and human fossils, and by the development of sociobiology and quantitative psychology. Deprived of scientific base, the theory of the "races" must bow before the notions of genetic variation and unicity of mankind.

Strange history: the fall of Rome explained in Hereditas.

In 1921 Hereditas published an article on the fall of Rome written by the famous classical scholar Martin P:son Nilsson. Why was a paper on this unexpected topic printed in the newly founded journal? To Nilsson, the demise of the Roman Empire was explained by the "bastardization" occurring between "races" from different parts of the realm. Offspring from mixed couples were of a less stable "type" than their parents, due to the breaking up by recombination of the original hereditary dispositions, which led to a general loss of competence to rule and govern. Thus, the "hardness" of human genes, together with their recombination, was - according to Nilsson - the main cause of the fall of Rome. Nilsson's argument is not particularly convincingly presented. Human "races" are taken to have the same genetic structure as inbred crop strains, and Nilsson believes in a metaphysical unity between the individual and the race to which it belongs. However, in my view, Martin P:son Nilsson and his friend Herman Nilsson-Ehle had wider aims with the article than to explain a historical event. The article can be read as indicating strong support from the classical human sciences to the ambitious new science of genetics. Support is also transferred from genetics to the conservative worldview, where the immutability and inflexibility of the Mendelian genes are used to strengthen the wish for greater stability in politics and life. The strange article in Hereditas can, thus, be read as an early instance in the - still ongoing - tug-of-war between the conservative and the liberal ideological poles over how genetic results best are socially interpreted.

Ciência, estética e raça: observando imagens e textos no periódico O Brasil Médico, 1928-1945 / Science, aesthetics and race: images and texts in O Brasil Médico, 1928-1945

Aborda formações discursivas sobre raça e eugenia em textos e imagens de O Brasil Médico , entre 1928 e 1945. A análise documental inspirada na perspectiva teórico-metodológica de Foucault, especialmente em sua concepção de biopolítica, encontrou referências aos problemas eugênicos da população brasileira e um conjunto de ilustrações, em sua maioria fotografias de corpos negros. Constatou-se a contradição de se promover um discurso universalista sobre raça concomitante aos discursos eugênicos e biotipológicos que revelavam preocupação com a degeneração na formação da raça brasileira. Os discursos descreviam um tipo racial brasileiro idealizado a partir de um padrão de normalidade física e moral como modelo adequado ao projeto de desenvolvimento e modernização da nação.

This study addresses the formation of discourse about race and eugenics in texts and images published in O Brasil Médico, between 1928 and 1945. The documental analysis inspired on Foucault’s theoretical and methodological perspectives, especially the concept of biopolitics, encountered references to the problems of eugenics amongst the Brazilian population, as well as a set of illustrations, mostly photographs of black people’s bodies. A contradiction was identified, where a universalistic discourse about race was expressed at the same time that discourses about eugenics and biotypes revealed concerns about the degeneration of the formation of the Brazilian race. These discourses describe a Brazilian race with an idealized standard of physical and moral normality to serve as a model for the development and modernization of the nation.

Recombination gives a new insight in the effective population size and the history of the old world human populations.

The information left by recombination in our genomes can be used to make inferences on our recent evolutionary history. Specifically, the number of past recombination events in a population sample is a function of its effective population size (Ne). We have applied a method, Identifying Recombination in Sequences (IRiS), to detect specific past recombination events in 30 Old World populations to infer their Ne. We have found that sub-Saharan African populations have an Ne that is approximately four times greater than those of non-African populations and that outside of Africa, South Asian populations had the largest Ne. We also observe that the patterns of recombinational diversity of these populations correlate with distance out of Africa if that distance is measured along a path crossing South Arabia. No such correlation is found through a Sinai route, suggesting that anatomically modern humans first left Africa through the Bab-el-Mandeb strait rather than through present Egypt.

The Ayala Mazar-Xiaohe culture: new archaeological discoveries in the Taklamakan desert, China.

This article, accompanied by colour photos, records the author's recent archaeological expedition in the Taklamakan Desert. His advance northwards along the now mostly sand-covered beds of the Keriya River proved to be a march backward through time, from the Iron Age city of Jumbulakum to the early Bronze Age necropolis of Ayala Mazar. The artifacts he found are contemporary with, and similar to Chinese discoveries at Xiaohe. This proves that Xiaohe was not an isolated case and provides evidence for a whole culture based on some sort of fertility cult. The remains also suggest that some, at least, of the peoples concerned had Indo-European affiliations.

The end of the Kachemak tradition on the Kenai Peninsula, southcentral Alaska.

The Kachemak tradition was established by ca. 3000 B.P. in Kachemak Bay. Probably somewhat later a variant termed Riverine Kachemak, with a population adapted to salmon and terrestrial resources, appeared on the northern Kenai Peninsula. The Kachemak tradition people seem to have abandoned Kachemak Bay by ca. 1400 B.P. Seven of 12 available Kachemak tradition dates predate 1400 B.P. even at two sigma. Scattered younger dates are thus suspect outliers. The end of Riverine Kachemak tradition has been placed at ca. 1000 B.P., at which time the population was supposedly replaced by in-migrating groups ancestral to the Dena'ina Athapaskans. Close examination of the numerous available radiocarbon dates shows that most Riverine Kachemak dates cluster in the early centuries of the First Millennium A.D. and most Dena'ina dates substantially postdate 1000 A.D. Probably the Riverine Kachemak and Dena'ina peoples never met on the Kenai River. However, the correspondence in date ranges between Kachemak Bay and Riverine Kachemak is striking, suggesting their fates were linked. Both traditions collapsed by 1400-1500 B.P. The causes are probably multiple but do not include cultural replacement.

Inferring the joint demographic history of multiple populations from multidimensional SNP frequency data.

Demographic models built from genetic data play important roles in illuminating prehistorical events and serving as null models in genome scans for selection. We introduce an inference method based on the joint frequency spectrum of genetic variants within and between populations. For candidate models we numerically compute the expected spectrum using a diffusion approximation to the one-locus, two-allele Wright-Fisher process, involving up to three simultaneous populations. Our approach is a composite likelihood scheme, since linkage between neutral loci alters the variance but not the expectation of the frequency spectrum. We thus use bootstraps incorporating linkage to estimate uncertainties for parameters and significance values for hypothesis tests. Our method can also incorporate selection on single sites, predicting the joint distribution of selected alleles among populations experiencing a bevy of evolutionary forces, including expansions, contractions, migrations, and admixture. We model human expansion out of Africa and the settlement of the New World, using 5 Mb of noncoding DNA resequenced in 68 individuals from 4 populations (YRI, CHB, CEU, and MXL) by the Environmental Genome Project. We infer divergence between West African and Eurasian populations 140 thousand years ago (95% confidence interval: 40-270 kya). This is earlier than other genetic studies, in part because we incorporate migration. We estimate the European (CEU) and East Asian (CHB) divergence time to be 23 kya (95% c.i.: 17-43 kya), long after archeological evidence places modern humans in Europe. Finally, we estimate divergence between East Asians (CHB) and Mexican-Americans (MXL) of 22 kya (95% c.i.: 16.3-26.9 kya), and our analysis yields no evidence for subsequent migration. Furthermore, combining our demographic model with a previously estimated distribution of selective effects among newly arising amino acid mutations accurately predicts the frequency spectrum of nonsynonymous variants across three continental populations (YRI, CHB, CEU).

Biohistorical approaches to "race" in the United States: Biological distances among African Americans, European Americans, and their ancestors.

Folk taxonomies of race are the categorizations used by people in their everyday judgments concerning the persons around them. As cultural traditions, folk taxonomies may shape gene flow so that it is unequal among groups sharing geography. The history of the United States is one of disparate people being brought together from around the globe, and provides a natural experiment for exploring the relationship between culture and gene flow. The biohistories of African Americans and European Americans were compared to examine whether population histories are shaped by culture when geography and language are shared. Dental morphological data were used to indicate phenotypic similarity, allowing diachronic change through United States history to be considered. Samples represented contemporary and historic African Americans and European Americans and their West African and European ancestral populations (N = 1445). Modified Mahalanobis' D(2) and Mean Measure of Divergence statistics examined how biological distances change through time among the samples. Results suggest the social acceptance for mating between descendents of Western Europeans and Eastern and Southern European migrants to the United States produced relatively rapid gene flow between the groups. Although African Americans have been in the United States much longer than most Eastern and Southern Europeans, social barriers have been historically stronger between them and European Americans. These results indicate that gene flow is in part shaped by cultural factors such as folk taxonomies of race, and have implications for understanding contemporary human variation, relationships among prehistoric populations, and forensic anthropology.

Going east: new genetic and archaeological perspectives on the modern human colonization of Eurasia.

The pattern of dispersal of biologically and behaviorally modern human populations from their African origins to the rest of the occupied world between approximately 60,000 and 40,000 years ago is at present a topic of lively debate, centering principally on the issue of single versus multiple dispersals. Here I argue that the archaeological and genetic evidence points to a single successful dispersal event, which took genetically and culturally modern populations fairly rapidly across southern and southeastern Asia into Australasia, and with only a secondary and later dispersal into Europe.

Observaciones de antropólogos sobre la dentadura de los Guayakis / Remarks of anthropologists about Guayakis´teeth

Se hace referencia a observaciones que sobre la dentadura del grupo étnico Guayaki, efectuaron desde fines del siglo XIX hasta mediados del XX, prestigiosos antropólogos que actuaron en nuestro país. Hoy, desaparecido su hábitat ante el avance de la civilización, lo que llevó a esa raza a su ocaso, esas observaciones pueden resultar interesantes como antecedente histórico para quienes cultivan la antropología dental

Orientalism in Euro-American and Indian psychology: historical representations of "natives" in Colonial and postcolonial contexts.

The author examines the historical role of Euro-American psychology in constructing Orientalist representations of the natives who were colonized by the European colonial powers. In particular, the author demonstrates how the power to represent the non-Western "Other" has always resided, and still continues to reside, primarily with psychologists working in Europe and America. It is argued that the theoretical frameworks that are used to represent non-Westerners in contemporary times continue to emerge from Euro-American psychology. Finally, the author discusses how non-Western psychologists internalized these Orientalist images and how such a move has led to a virtual abandonment of pursuing "native" forms of indigenous psychologies in Third World psychology departments.