scholarly journals Genetic structure and sex-biased gene flow in the history of southern African populations

2017 ◽  
Author(s):  
Vladimir Bajić ◽  
Chiara Barbieri ◽  
Alexander Hübner ◽  
Tom Güldemann ◽  
Christfried Naumann ◽  
...  
Keyword(s):  
Gene Flow ◽  
Y Chromosome ◽  
Southern Africa ◽  
Social Dynamics ◽  
Population History ◽  
Eastern Africa ◽  
The Social ◽  
African Populations ◽  
History Of ◽  
Over Time

ABSTRACTObjectivesWe investigated the genetic history of southern African populations with a special focus on their paternal history. We reexamined previous claims that the Y-chromosome haplogroup E1b1b was brought to southern Africa by pastoralists from eastern Africa, and investigated patterns of sex-biased gene flow in southern Africa.Material and MethodsWe analyzed previously published complete mtDNA genome sequences and ~900 kb of NRY sequences from 23 populations from Namibia, Botswana and Zambia, as well as haplogroup frequencies from a large sample of southern African populations and 23 newly genotyped Y-linked STR loci for samples assigned to haplogroup E1b1b.ResultsOur results support an eastern African origin for Y-chromosome haplogroup E1b1b; however, its current distribution in southern Africa is not strongly associated with pastoralism, suggesting a more complex origin for pastoralism in this region. We confirm that the Bantu expansion had a notable genetic impact in southern Africa, and that in this region it was probably a rapid, male-dominated expansion. Furthermore, we find a significant increase in the intensity of sex-biased gene flow from north to south, which may reflect changes in the social dynamics between Khoisan and Bantu groups over time.ConclusionsOur study shows that the population history of southern Africa has been very complex, with different immigrating groups mixing to different degrees with the autochthonous populations. The Bantu expansion led to heavily sex-biased admixture as a result of interactions between Khoisan females and Bantu males, with a geographic gradient which may reflect changes in the social dynamics between Khoisan and Bantu groups over time.

scholarly journals Fine-scale human population structure in southern Africa reflects ecogeographic boundaries

2017 ◽  
Author(s):  
Caitlin Uren ◽  
Minju Kim ◽  
Alicia R. Martin ◽  
Dean Bobo ◽  
Christopher R. Gignoux ◽  
...  
Keyword(s):  
Population Structure ◽  
Southern Africa ◽  
Population History ◽  
Eastern Africa ◽  
Fine Scale ◽  
Kalahari Desert ◽  
African Populations ◽  
Scale Population ◽  
Genetic Impact ◽  
Northern Cape

AbstractRecent genetic studies have established that the KhoeSan populations of southern Africa are distinct from all other African populations and have remained largely isolated during human prehistory until about 2,000 years ago. Dozens of different KhoeSan groups exist, belonging to three different language families, but very little is known about their population history. We examine new genome-wide polymorphism data and whole mitochondrial genomes for more than one hundred South Africans from the ≠Khomani San and Nama populations of the Northern Cape, analyzed in conjunction with 19 additional southern African populations. Our analyses reveal fine-scale population structure in and around the Kalahari Desert. Surprisingly, this structure does not always correspond to linguistic or subsistence categories as previously suggested, but rather reflects the role of geographic barriers and the ecology of the greater Kalahari Basin. Regardless of subsistence strategy, the indigenous Khoe-speaking Nama pastoralists and the N|u-speaking ≠Khomani (formerly hunter-gatherers) share ancestry with other Khoe-speaking forager populations that form a rim around the Kalahari Desert. We reconstruct earlier migration patterns and estimate that the southern Kalahari populations were among the last to experience gene flow from Bantu-speakers, approximately 14 generations ago. We conclude that local adoption of pastoralism, at least by the Nama, appears to have been primarily a cultural process with limited genetic impact from eastern Africa.Data depositionData files are freely available on the Henn Lab website: http://ecoevo.stonybrook.edu/hennlab/data-software/SummaryDistinct, spatially organized ancestries demonstrate fine-scale population structure in southern Africa, implying a more complex history of the KhoeSan than previously thought. Southern KhoeSan ancestry in the Nama and ≠Khomani is shared in a rim around the Kalahari Desert. We hypothesize that there was recent migration of pastoralists from East Africa into southern Africa, independent of the Bantu-expansion, but the spread of pastoralism within southern Africa occurred largely by cultural diffusion.

The Social Dynamics of Dedication

2017 ◽  
Author(s):  
Christy Constantakopoulou
Keyword(s):  
Social History ◽  
Social Dynamics ◽  
Annual Basis ◽  
The Social ◽  
History Of

This chapter provides a methodological discussion on how to use the evidence included in the Delian inventories in order to write the social history of the dedicants. The inventories were produced by the Delian hieropoioi and recorded on an annual basis the dedications kept in the Delian treasuries. The chapter focuses particularly on dedications which are attached to named individuals and communities. It then discusses the material according to the parameters of gender, individual versus community dedications, elite dedicants, and distance of travel. Using the inventories we are able to reconstruct who came to the Delian sanctuary to dedicate objects.

scholarly journals The Politics of Credentials: A Commentary and Critique of the Presbyterian Church in Southern Africa

2018 ◽  
Vol 20 (3) ◽  
pp. 305-327
Author(s):  
Graham A Duncan
Keyword(s):  
Southern Africa ◽  
Research Question ◽  
Primary Sources ◽  
Presbyterian Church ◽  
History Of ◽  
The Church ◽  
Over Time ◽  
Church Tradition

The use of credentials in an ecclesiastical context is a means of assuring that a minister is who he or she claims to be and is therefore trained and qualified to exercise ministry within a particular church tradition as determined by individual denominations. The concept and use of credentials has developed over time. Using primary sources in the main, this article examines the use of credentials as a tool for ‘inclusion’ or a means of ‘exclusion’, or both, in the history of the largest Presbyterian church in Southern Africa and its predecessors. The research question under study is to what degree, if any, were credentials used to control ministers and to cleanse and purify the church of radical – such as anti-apartheid – elements?

scholarly journals Self-organizing dominance hierarchies in a wild primate population

2015 ◽  
Vol 282 (1814) ◽  
pp. 20151512 ◽  
Author(s):  
Mathias Franz ◽  
Emily McLean ◽  
Jenny Tung ◽  
Jeanne Altmann ◽  
Susan C. Alberts
Keyword(s):  
Individual Differences ◽  
Social Dynamics ◽  
Experimental Studies ◽  
Self Organization ◽  
Social Self ◽  
Dominance Hierarchies ◽  
Change Over Time ◽  
Winner And Loser Effects ◽  
The Social ◽  
Over Time

Linear dominance hierarchies, which are common in social animals, can profoundly influence access to limited resources, reproductive opportunities and health. In spite of their importance, the mechanisms that govern the dynamics of such hierarchies remain unclear. Two hypotheses explain how linear hierarchies might emerge and change over time. The ‘prior attributes hypothesis’ posits that individual differences in fighting ability directly determine dominance ranks. By contrast, the ‘social dynamics hypothesis’ posits that dominance ranks emerge from social self-organization dynamics such as winner and loser effects. While the prior attributes hypothesis is well supported in the literature, current support for the social dynamics hypothesis is limited to experimental studies that artificially eliminate or minimize individual differences in fighting abilities. Here, we present the first evidence supporting the social dynamics hypothesis in a wild population. Specifically, we test for winner and loser effects on male hierarchy dynamics in wild baboons, using a novel statistical approach based on the Elo rating method for cardinal rank assignment, which enables the detection of winner and loser effects in uncontrolled group settings. Our results demonstrate (i) the presence of winner and loser effects, and (ii) that individual susceptibility to such effects may have a genetic basis. Taken together, our results show that both social self-organization dynamics and prior attributes can combine to influence hierarchy dynamics even when agonistic interactions are strongly influenced by differences in individual attributes. We hypothesize that, despite variation in individual attributes, winner and loser effects exist (i) because these effects could be particularly beneficial when fighting abilities in other group members change over time, and (ii) because the coevolution of prior attributes and winner and loser effects maintains a balance of both effects.

scholarly journals The role of matrilineality in shaping patterns of Y chromosome and mtDNA sequence variation in southwestern Angola

2018 ◽  
Author(s):  
Sandra Oliveira ◽  
Alexander Hübner ◽  
Anne-Maria Fehn ◽  
Teresa Aço ◽  
Fernanda Lages ◽  
...  
Keyword(s):  
Y Chromosome ◽  
Sequence Data ◽  
Population History ◽  
Female Population ◽  
Bantu Languages ◽  
Mtdna Sequence ◽  
Population Sizes ◽  
Group Variation ◽  
History Of ◽  
Previous Demonstration

AbstractSouthwestern Angola is a region characterized by contact between indigenous foragers and incoming food-producers, involving genetic and cultural exchanges between peoples speaking Kx’a, Khoe-Kwadi and Bantu languages. Although present-day Bantu-speakers share a patrilocal residence pattern and matrilineal principle of clan and group membership, a highly stratified social setting divides dominant pastoralists from marginalized groups that subsist on alternative strategies and have previously been though to have pre-Bantu origins. Here, we compare new high-resolution sequence data from 2.3 Mb of the non-recombining Y chromosome (NRY) from 170 individuals with previously reported mitochondrial genomes (mtDNA), to investigate the population history of seven representative southwestern Angolan groups (Himba, Kuvale, Kwisi, Kwepe, Twa, Tjimba, !Xun) and to study the causes and consequences of sex-biased processes in their genetic variation. We found no clear link between the formerly Kwadi-speaking Kwepe and pre-Bantu eastern African migrants, and no pre-Bantu NRY lineages among Bantu-speaking groups, except for small amounts of “Khoisan” introgression. We therefore propose that irrespective of their subsistence strategies, all Bantu-speaking groups of the area share a male Bantu origin. Additionally, we show that in Bantu-speaking groups, the levels of among-group and between-group variation are higher for mtDNA than for NRY. These results, together with our previous demonstration that the matriclanic systems of southwestern Angolan Bantu groups are genealogically consistent, suggest that matrilineality strongly enhances both female population sizes and interpopulation mtDNA variation.

scholarly journals Population structure and demographic history of the chukar partridge Alectoris chukar in China

2013 ◽  
Vol 59 (4) ◽  
pp. 458-474 ◽  
Author(s):  
Sen Song ◽  
Shijie Bao ◽  
Ying Wang ◽  
Xinkang Bao ◽  
Bei An ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
North America ◽  
Demographic History ◽  
Population Expansion ◽  
Northwest China ◽  
Population History ◽  
Extant Species ◽  
History Of ◽  
Chukar Partridge

Abstract Pleistocene climate fluctuations have shaped the patterns of genetic diversity observed in extant species. Although the effects of recent glacial cycles on genetic diversity have been well studied on species in Europe and North America, genetic legacy of species in the Pleistocene in north and northwest of China where glaciations was not synchronous with the ice sheet development in the Northern Hemisphere or or had little or no ice cover during the glaciations’ period, remains poorly understood. Here we used phylogeographic methods to investigate the genetic structure and population history of the chukar partridge Alec-toris chukar in north and northwest China. A 1,152 – 1,154 bp portion of the mtDNA CR were sequenced for all 279 specimens and a total number of 91 haplotypes were defined by 113 variable sites. High levels of gene flow were found and gene flow estimates were greater than 1 for most population pairs in our study. The AMOVA analysis showed that 81% and 16% of the total genetic variability was found within populations and among populations within groups, respectively. The demographic history of chukar was examined using neutrality tests and mismatch distribution analyses and results indicated Late Pleistocene population expansion. Results revealed that most populations of chukar experienced population expansion during 0.027 ? 0.06 Ma. These results are at odds with the results found in Europe and North America, where population expansions occurred after Last Glacial Maximum (LGM, 0.023 to 0.018 Ma). Our results are not consistent with the results from avian species of Tibetan Plateau, either, where species experienced population expansion following the retreat of the extensive glaciation period (0.5 to 0.175 Ma).

scholarly journals Denisovan ancestry and population history of early East Asians

2020 ◽  
Author(s):  
Diyendo Massilani ◽  
Laurits Skov ◽  
Mateja Hajdinjak ◽  
Byambaa Gunchinsuren ◽  
Damdinsuren Tseveendorj ◽  
...  
Keyword(s):  
Gene Flow ◽  
Human Population ◽  
Modern Human ◽  
Population History ◽  
East Asians ◽  
Aboriginal Australians ◽  
North East ◽  
History Of ◽  
Female Member ◽  
Admixture Event

AbstractWe present analyses of the genome of a ~34,000-year-old hominin skull cap discovered in the Salkhit Valley in North East Mongolia. We show that this individual was a female member of a modern human population that, following the split between East and West Eurasians, experienced substantial gene flow from West Eurasians. Both she and a 40,000-year-old individual from Tianyuan outside Beijing carried genomic segments of Denisovan ancestry. These segments derive from the same Denisovan admixture event(s) that contributed to present-day mainland Asians but are distinct from the Denisovan DNA segments in present-day Papuans and Aboriginal Australians.

scholarly journals On the issue of scientific research of rural youth of Yakutia 1970-1980-s

2019 ◽  
Vol 72 ◽  
pp. 04001
Author(s):  
Petr Egorov ◽  
Anna Adamenko ◽  
Terenty Ermolaev
Keyword(s):  
Social Dynamics ◽  
Agricultural Sector ◽  
Scientific Research ◽  
Rural Youth ◽  
Youth Movement ◽  
The Social ◽  
History Of ◽  
The Impact ◽  
The Village ◽  
Scientific Ideas

The article discusses the history of the study of rural youth in Yakutia in the 70-80s. XX century through a historiographic review of scientific works on the youth problem. During the period under review, the role of rural youth increased, she began to actively participate in the socio-economic processes taking place in the countryside, and represented a significant share and the main resource of labor replenishment for the agricultural sector of the economy. In studies of the 70s - early 80s. emphasis was placed on the social aspects of scientific and technological progress, the impact of industrialization and intensification of agricultural production on the social structure of the rural population, and the improvement of its professional, cultural and technical level. Since the mid-1980s, research has begun to raise many complex problems related to rural lifestyles, and especially on such important changes as rural life, spiritual and material needs and needs of various population groups, in particular rural youth, factors and prospects of youth movement between the village and the city. It was established that scientific research allowed to expand scientific ideas about the rural youth of Yakutia, its social dynamics, determining its place and role in society.

Gene flow from multiple sources maintains high genetic diversity and stable population history of Common MoorhenGallinula chloropusin China

Ibis ◽  
2018 ◽  
Vol 160 (4) ◽  
pp. 855-869 ◽  
Author(s):  
Luzhang Ruan ◽  
Wei Xu ◽  
Yuqing Han ◽  
Chaoying Zhu ◽  
Bicai Guan ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Population History ◽  
Stable Population ◽  
Multiple Sources ◽  
High Genetic Diversity ◽  
History Of

scholarly journals Denisovan ancestry and population history of early East Asians

Science ◽  
2020 ◽  
Vol 370 (6516) ◽  
pp. 579-583
Author(s):  
Diyendo Massilani ◽  
Laurits Skov ◽  
Mateja Hajdinjak ◽  
Byambaa Gunchinsuren ◽  
Damdinsuren Tseveendorj ◽  
...  
Keyword(s):  
Gene Flow ◽  
Human Population ◽  
Modern Human ◽  
Population History ◽  
East Asians ◽  
Aboriginal Australians ◽  
History Of ◽  
East And West ◽  
Female Member ◽  
Admixture Event

We present analyses of the genome of a ~34,000-year-old hominin skull cap discovered in the Salkhit Valley in northeastern Mongolia. We show that this individual was a female member of a modern human population that, following the split between East and West Eurasians, experienced substantial gene flow from West Eurasians. Both she and a 40,000-year-old individual from Tianyuan outside Beijing carried genomic segments of Denisovan ancestry. These segments derive from the same Denisovan admixture event(s) that contributed to present-day mainland Asians but are distinct from the Denisovan DNA segments in present-day Papuans and Aboriginal Australians.

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