scholarly journals Population inter-connectivity over the past 120,000 years explains distribution and diversity of Central African hunter-gatherers

2021 ◽  
Author(s):  
Cecilia Padilla-Iglesias ◽  
Lane Atmore ◽  
Jesus Olivero ◽  
Karen Lupo ◽  
Andrea Manica ◽  
...  
Keyword(s):  
Homo Sapiens ◽  
Central Africa ◽  
Modern Human ◽  
Archaeological Sites ◽  
Effective Population ◽  
Hunter Gatherers ◽  
The Past ◽  
Population Sizes ◽  
History Of ◽  
Local Differentiation

The evolutionary history of African hunter-gatherers holds key insights into modern human diversity. Here we combine ethnographic and genetic data on Central African hunter-gatherers (CAHG) to show that their current distribution and density is explained by ecology rather than by a displacement to marginal habitats due to recent farming expansions, as commonly assumed. We also predicted hunter-gatherer presence across Central Africa over the past 120,000 years using paleoclimatic reconstructions, which were statistically validated by dated archaeological sites. Finally, we show that genomic estimates of separation times between CAHG groups match our ecological estimates of periods favouring population splits, and that recoveries of connectivity would have facilitated subsequent gene-flow. Our results reveal that CAHG stem from a deep history of partially connected populations. This form of sociality allowed the coexistence of relatively large effective population sizes and local differentiation, with important implications for the evolution of genetic and cultural diversity in Homo sapiens.

Introduction

2018 ◽  
Author(s):  
Gianfranco Pacchioni
Keyword(s):  
Industrial Revolution ◽  
Homo Sapiens ◽  
Modern Society ◽  
Full Time ◽  
Human Race ◽  
Hunter Gatherers ◽  
The Past ◽  
The World ◽  
The Universe ◽  
Radical Transformation

About 10,000 years ago, at the beginning of the agriculturalrevolution, on the whole earth lived between 5 and 8 million hunter-gatherers, all belonging to the Homo sapiens species. Five thousand years later, freed from the primary needs for survival, some belonging to that species enjoyed the privilege of devoting themselves to philosophical speculation and the search for transcendental truths. It was only in the past two hundred years, however, with the advent of the Industrial Revolution, that reaping nature’s secrets and answering fundamental questions posed by the Universe have become for many full-time activities, on the way to becoming a real profession. Today the number of scientists across the globe has reached and exceeded 10 million, that is, more than the whole human race 10,000 years ago. If growth continues at the current rate, in 2050 we will have 35 million people committed full-time to scientific research. With what consequences, it remains to be understood. For almost forty years I myself have been concerned with science in a continuing, direct, and passionate way. Today I perceive, along with many colleagues, especially of my generation, that things are evolving and have changed deeply, in ways unimaginable until a few years ago and, in some respects, not without danger. What has happened in the world of science in recent decades is more than likely a mirror of a similar and equally radical transformation taking place in modern society, particularly with the advent ...

Fyodor Fyodorovich Martens (1845–1909) a humanist of modern times

1996 ◽  
Vol 36 (312) ◽  
pp. 300-314 ◽  
Author(s):  
Vladimir Pustogarov
Keyword(s):  
Oral Tradition ◽  
Archaeological Sites ◽  
Mutual Aid ◽  
Modern Times ◽  
Contemporary World ◽  
The Past ◽  
History Of ◽  
Ancient Record ◽  
Peace And War ◽  
The Ideal

In the history of humankind, no matter how far back we look into the past, peaceful relations between people and nations have always been the ideal, and yet this history abounds in wars and bloodshed. The documentary evidence, oral tradition and the mute testimony of archaeological sites tell an incontrovertible tale of man's cruelty and violence against his fellow man. Nevertheless, manifestations of compassion, mercy and mutual aid have a no less ancient record. Peace and war, goodneighbourly attitudes and aggression, brutality and humanity exist side by side in the contemporary world as well.

scholarly journals The Genetic History of France

2019 ◽  
Author(s):  
Aude Saint Pierre ◽  
Joanna Giemza ◽  
Matilde Karakachoff ◽  
Isabel Alves ◽  
Philippe Amouyel ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Demographic History ◽  
Migration Routes ◽  
Effective Population ◽  
Genetic Studies ◽  
Independent Population ◽  
Genome Wide Data ◽  
Population Sizes ◽  
History Of ◽  
Exhaustive Study

ABSTRACTThe study of the genetic structure of different countries within Europe has provided significant insights into their demographic history and their actual stratification. Although France occupies a particular location at the end of the European peninsula and at the crossroads of migration routes, few population genetic studies have been conducted so far with genome-wide data. In this study, we analyzed SNP-chip genetic data from 2 184 individuals born in France who were enrolled in two independent population cohorts. Using FineStructure, six different genetic clusters of individuals were found that were very consistent between the two cohorts. These clusters match extremely well the geography and overlap with historical and linguistic divisions of France. By modeling the relationship between genetics and geography using EEMS software, we were able to detect gene flow barriers that are similar in the two cohorts and corresponds to major French rivers or mountains. Estimations of effective population sizes using IBDNe program also revealed very similar patterns in both cohorts with a rapid increase of effective population sizes over the last 150 generations similar to what was observed in other European countries. A marked bottleneck is also consistently seen in the two datasets starting in the fourteenth century when the Black Death raged in Europe. In conclusion, by performing the first exhaustive study of the genetic structure of France, we fill a gap in the genetic studies in Europe that would be useful to medical geneticists but also historians and archeologists.

Frameworks for Europe’s Past

2013 ◽  
Author(s):  
T. Douglas Price
Keyword(s):  
Iron Age ◽  
Small Groups ◽  
Archaeological Sites ◽  
Archaeological Research ◽  
Stone Age ◽  
The Past ◽  
History Of ◽  
Growth And Change ◽  
Early Human ◽  
Prehistoric Time

This book is about the prehistoric archaeology of Europe—the lives and deaths of peoples and cultures—about how we became human; the rise of hunters; the birth and growth of society; the emergence of art; the beginnings of agriculture, villages, towns and cities, wars and conquest, peace and trade—the plans and ideas, achievements and failures, of our ancestors across hundreds of thousands of years. It is a story of humanity on planet Earth. It’s also about the study of the past—how archaeologists have dug into the ground, uncovered the remaining traces of these ancient peoples, and begun to make sense of that past through painstaking detective work. This book is about prehistoric societies from the Stone Age into the Iron Age. The story of European prehistory is one of spectacular growth and change. It begins more than a million years ago with the first inhabitants. The endpoint of this journey through the continent’s past is marked by the emergence of the literate societies of classical Greece and Rome. Because of a long history of archaeological research and the richness of the prehistoric remains, we know more about the past of Europe than almost anywhere else. The prehistory of Europe is, in fact, one model of the evolution of society, from small groups of early human ancestors to bands of huntergatherers, through the arrival of the first farmers to the emergence of hierarchical societies and powerful states in the Bronze and Iron Ages. The chapters of our story are the major ages of prehistoric time (Stone, Bronze, and Iron). The content involves the places, events, and changes of those ages from ancient to more recent times. The focus of the chapters is on exceptional archaeological sites that provide the background for much of this story. Before we can begin, however, it is essential to review the larger context in which these developments took place. This chapter is concerned with the time and space setting of the archaeology of Europe.

Hunter-gatherers on the best-seller list: Steven Pinker and the “Bellicose School's” treatment of forager violence

2014 ◽  
Vol 6 (4) ◽  
pp. 216-228 ◽  
Author(s):  
Richard B. Lee
Keyword(s):  
Homo Sapiens ◽  
Human Populations ◽  
Hunter Gatherers ◽  
Content Type ◽  
Lethal Violence ◽  
Use Of Data ◽  
Hunting And Gathering ◽  
History Of ◽  
Early Farmers ◽  
Philosophical Debates

Purpose – The question of violence in hunter-gatherer society has animated philosophical debates since at least the seventeenth century. Steven Pinker has sought to affirm that civilization, is superior to the state of humanity during its long history of hunting and gathering. The purpose of this paper is to draw upon a series of recent studies that assert a baseline of primordial violence by hunters and gatherers. In challenging this position the author draws on four decades of ethnographic and historical research on hunting and gathering peoples. Design/methodology/approach – At the empirical heart of this question is the evidence pro- and con- for high rates of violent death in pre-farming human populations. The author evaluates the ethnographic and historical evidence for warfare in recorded hunting and gathering societies, and the archaeological evidence for warfare in pre-history prior to the advent of agriculture. Findings – The view of Steven Pinker and others of high rates of lethal violence in hunters and gatherers is not sustained. In contrast to early farmers, their foraging precursors lived more lightly on the land and had other ways of resolving conflict. With little or no fixed property they could easily disperse to diffuse conflict. The evidence points to markedly lower levels of violence for foragers compared to post-Neolithic societies. Research limitations/implications – This conclusion raises serious caveats about the grand evolutionary theory asserted by Steven Pinker, Richard Wrangham and others. Instead of being “killer apes” in the Pleistocene and Holocene, the evidence indicates that early humans lived as relatively peaceful hunter-gathers for some 7,000 generations, from the emergence of Homo sapiens up until the invention of agriculture. Therefore there is a major gap between the purported violence of the chimp-like ancestors and the documented violence of post-Neolithic humanity. Originality/value – This is a critical analysis of published claims by authors who contend that ancient and recent hunter-gatherers typically committed high levels of violent acts. It reveals a number of serious flaws in their arguments and use of data.

scholarly journals Sporadic Genetic Connectivity among Small Insular Populations of the Rare Geoendemic Plant Caulanthus amplexicaulis var. barbarae (Santa Barbara Jewelflower)

2019 ◽  
Vol 110 (5) ◽  
pp. 587-600
Author(s):  
A Millie Burrell ◽  
Jeffrey H R Goddard ◽  
Paul J Greer ◽  
Ryan J Williams ◽  
Alan E Pepper
Keyword(s):  
Gene Flow ◽  
Genetic Connectivity ◽  
Effective Population ◽  
Evolutionary Potential ◽  
Isolated Populations ◽  
Long Distance ◽  
Population Sizes ◽  
History Of ◽  
Small Set ◽  
Nuclear Microsatellite

Abstract Globally, a small number of plants have adapted to terrestrial outcroppings of serpentine geology, which are characterized by soils with low levels of essential mineral nutrients (N, P, K, Ca, Mo) and toxic levels of heavy metals (Ni, Cr, Co). Paradoxically, many of these plants are restricted to this harsh environment. Caulanthus ampexlicaulis var. barbarae (Brassicaceae) is a rare annual plant that is strictly endemic to a small set of isolated serpentine outcrops in the coastal mountains of central California. The goals of the work presented here were to 1) determine the patterns of genetic connectivity among all known populations of C. ampexlicaulis var. barbarae, and 2) estimate contemporary effective population sizes (Ne), to inform ongoing genomic analyses of the evolutionary history of this taxon, and to provide a foundation upon which to model its future evolutionary potential and long-term viability in a changing environment. Eleven populations of this taxon were sampled, and population-genetic parameters were estimated using 11 nuclear microsatellite markers. Contemporary effective population sizes were estimated using multiple methods and found to be strikingly small (typically Ne < 10). Further, our data showed that a substantial component of genetic connectivity of this taxon is not at equilibrium, and instead showed sporadic gene flow. Several lines of evidence indicate that gene flow between isolated populations is maintained through long-distance seed dispersal (e.g., >1 km), possibly via zoochory.

The Prehistoric Sequence at Nakapapula Rockshelter, Zambia

1970 ◽  
Vol 35 ◽  
pp. 172-202 ◽  
Author(s):  
D. W. Phillipson
Keyword(s):  
Iron Age ◽  
Central Africa ◽  
Archaeological Sites ◽  
Early Iron Age ◽  
Stone Age ◽  
Hunter Gatherers ◽  
Late Stone Age ◽  
Age Sequence ◽  
Relationship Of ◽  
The Relationship

Considerable attention has recently been paid to the start of the Iron Age in East and Central Africa. One of the most interesting problems concerning this period is that of the relationship of the Early Iron Age farming people to the hunter-gatherers of the Late Stone Age whom they eventually displaced. Very few archaeological sites are known, and none have yet been published, which illustrate the Late Stone Age/Iron Age transition in Central Africa, and discussions of this and related problems have so far been largely based on conjecture. Evidence concerning this important transition was recently unearthed at Nakapapula rockshelter in the Serenje District of central Zambia. Here a long and relatively homogeneous Late Stone Age sequence of Nachikufan type was seen to continue into the 2nd millennium A.D., that is, well after the first appearance of Early Iron Age pottery at this site and elsewhere in Zambia. Nakapapula has also yielded the first archaeological evidence for the date of schematic rock art in Central Africa and confirmed its contemporaneity with the Early Iron Age.

scholarly journals Estimating required ‘lockdown’ cycles before immunity to SARS-CoV-2: Model-based analyses of susceptible population sizes, ‘S0’, in seven European countries including the UK and Ireland

2020 ◽  
Author(s):  
Rosalyn J. Moran ◽  
Erik D. Fagerholm ◽  
Maell Cullen ◽  
Jean Daunizeau ◽  
Mark P. Richardson ◽  
...  
Keyword(s):  
Continuous Time ◽  
Total Population ◽  
European Countries ◽  
Effective Population ◽  
Susceptible Population ◽  
Death Rates ◽  
Seir Model ◽  
The Past ◽  
Population Sizes ◽  
The Uk

AbstractBackgroundFollowing stringent social distancing measures, some European countries are beginning to report a slowed or negative rate of growth of daily case numbers testing positive for the novel coronavirus. The notion that the first wave of infection is close to its peak begs the question of whether future peaks or ‘second waves’ are likely. We sought to determine the current size of the effective (i.e. susceptible) population for seven European countries—to estimate immunity levels following this first wave. We compare these numbers to the total population sizes of these countries, in order to investigate the potential for future peaks.MethodsWe used Bayesian model inversion to estimate epidemic parameters from the reported case and death rates from seven countries using data from late January 2020 to April 5th 2020. Two distinct generative model types were employed: first a continuous time dynamical-systems implementation of a Susceptible-Exposed-Infectious-Recovered (SEIR) model and second: a partially observable Markov Decision Process (MDP) or hidden Markov model (HMM) implementation of an SEIR model. Both models parameterise the size of the initial susceptible population (‘S0’), as well as epidemic parameters. Parameter estimation (‘data fitting’) was performed using a standard Bayesian scheme (variational Laplace) designed to allow for latent unobservable states and uncertainty in model parameters.ResultsBoth models recapitulated the dynamics of transmissions and disease as given by case and death rates. The peaks of the current waves were predicted to be in the past for four countries (Italy, Spain, Germany and Switzerland) and to emerge in 0.5 – 2 weeks in Ireland and 1-3 weeks in the UK. For France one model estimated the peak within the past week and the other in the future in two weeks. Crucially, Maximum a posteriori (MAP) estimates of S0 for each country indicated effective population sizes of below 20% (of total population size), under both the continuous time and HMM models. Using for all countries—with a Bayesian weighted average across all seven countries and both models, we estimated that 6.4% of the total population would be immune. From the two models the maximum percentage of the effective population was estimated at 19.6% of the total population for the UK, 16.7% for Ireland, 11.4% for Italy, 12.8% for Spain, 18.8% for France, 4.7% for Germany and 12.9% for Switzerland.ConclusionOur results indicate that after the current wave, a large proportion of the total population will remain without immunity. This suggests that in the absence of strong seasonal effects, new medications or more comprehensive contact tracing, a further set of epidemic waves in different geographic centres are likely. These findings may have implications for ‘exit strategies’ from any lockdown stage.

scholarly journals Continuous vegetation record of the Greater Cape Floristic Region (South Africa) covering the past 300 thousand years (IODP U1479)

2021 ◽  
Author(s):  
Lydie M. Dupont ◽  
Xueqin Zhao ◽  
Chistopher Charles ◽  
J. Tyler Faith ◽  
David Braun
Keyword(s):  
South Africa ◽  
Vegetation History ◽  
Modern Human ◽  
Cape Floristic Region ◽  
Archaeological Record ◽  
The Past ◽  
Modern Human Origins ◽  
Last Glaciation ◽  
History Of ◽  
The Last Glacial

Abstract. The flora of the Greater Cape Floristic Region (GCFR) of South Africa is a biodiversity hotspot of global significance, and its archaeological record has contributed substantially to the understanding of modern human origins. For both reasons, the climate and vegetation history of south-western South Africa is of interest to numerous fields. Currently known paleo-environmental records cover the Holocene, the last glacial-interglacial transition and parts of the last glaciation but do not encompass a full glacial-interglacial cycle. To obtain a continuous vegetation record of the last Pleistocene glacial-interglacial cycles, we studied pollen, spores and micro-charcoal of deep-sea sediments from IODP Site U1479 retrieved from SW of Cape Town. We compare our palynological results of the Pleistocene with previously published results of Pliocene material from the same site. We find that the vegetation of the GCFR, in particular Fynbos and Afrotemperate forest, respond to precessional forcing of climate. The micro-charcoal record confirms the importance of fires in the Fynbos vegetation. Ericaceae-rich and Asteraceae-rich types of Fynbos could extend on the western part of the Palaeo-Agulhas Plain (PAP), which emerged during periods of low sea-level of the Pleistocene.

scholarly journals The infinite alleles model revisited: a Gibbs sampling approach

2021 ◽  
Author(s):  
Marc Manceau
Keyword(s):  
Viral Sequence ◽  
Mutation Process ◽  
Effective Population ◽  
Viral Genomes ◽  
Joint Reconstruction ◽  
The Past ◽  
Simplifying Assumptions ◽  
Population Sizes ◽  
New Perspective ◽  
Infinite Alleles Model

The SARS-CoV-2 outbreak started in late 2019 in the Hubei province in China and the first viral sequence was made available to the scientific community on early January 2020. From there, viral genomes from all over the world have followed at an outstanding rate, reaching already more than 10^5 on early May 2020, and more than 10^6 by early March 2021. Phylodynamics methods have been designed in recent years to process such datasets and infer population dynamics and sampling intensities in the past. However, the unprecedented scale of the SARS-CoV-2 dataset now calls for new methodological developments, relying e.g. on simplifying assumptions of the mutation process. In this article, I build on the infinite alleles model stemming from the field of population genetics to develop a new Bayesian statistical method allowing the joint reconstruction of the outbreak's effective population sizes and sampling intensities through time. This relies on prior conjugacy properties that prove useful both to develop a Gibbs sampler and to gain intuition on the way different parameters of the model are linked and inferred. I finally illustrate the use of this method on SARS-CoV-2 genomes sequenced during the first wave of the outbreak in four distinct European countries, thus offering a new perspective on the evolution of the sampling intensity through time in these countries from genetic data only.

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