Population and Society in Southeast Asia: a Historical Perspective

Total Page:16

File Type:pdf, Size:1020Kb

Population and Society in Southeast Asia: a Historical Perspective In Linda Williams and Philip Guest, eds. Demography of Southeast Asia. (2012) Southeast Asia Program, Cornell University, Ithaca, NY. CHAPTER 1 POPULATION AND SOCIETY IN SOUTHEAST ASIA: A HISTORICAL PERSPECTIVE Charles Hirschman and Sabrina Bonaparte One of the characteristics of Southeast Asia before 1750, in contrast to adjacent India and China, was low population density. Most of the region was still covered by jungle as late as 1800, so that attacks by tigers were not uncommon even on the outskirts of substantial population centers.1 Prior to the twentieth century, there were a number of medium-size cities in Southeast Asia as well as some densely settled rice-growing regions, but much of Southeast Asia remained a sparsely settled region relative to East and South Asia.2 The low population density of Southeast Asia reflected the character of a peripheral region with relatively weak states and large frontiers inhabited by populations of shifting cultivators. In 1900, the population of Southeast Asia was only about 80 million and almost one-third of this number was concentrated in Java alone.3 Southeast Asia is no longer at the periphery—demographically, economically, or politically. Characterized by sprawling megacities and a densely settled countryside, it is hard to imagine that tigers were once a major threat to those who lived on the outskirts of large Southeast Asian cities. With wild animals banished to zoos, and even the once ubiquitous trishaws and bicycles almost gone, the major features of Southeast Asia cities are shopping malls, congested roadways, and pervasive smog arising from urban industries and motorized transport. The subsistence economies of the Southeast Asian past have grown into dynamic economic engines producing 1Anthony Reid, “Economic and Social Change, c. 1400–1800,” in The Cambridge History of Southeast Asia, Volume Two: The Nineteenth and Twentieth Centuries, ed. Nicholas Tarling (Cambridge: Cambridge University Press, 1992), pp. 460–461. 2 Wilbur Zelinsky, “The Indochinese Peninsula: A Demographic Anomaly,” Far Eastern Quarterly 9 (1950): 115–45. 3 Colin McEvedy and Richard Jones, Atlas of World Population History (New York, NY: Penguin Books, 1978), pp. 190–203. 2 Charles Hirschman and Sabrina Bonaparte electronic goods, clothing and footwear, and household appliances for world markets. The economic, political, and strategic centrality of contemporary Southeast Asia is evident in the annual meetings of ASEAN (Association of Southeast Asian Nations, the influential, quasi-political association of the region), which draw representatives from all the major industrial blocs in the world. These economic and political changes in Southeast Asia have been accompanied by extraordinary rates of population growth, especially during the second half of the twentieth century. At the end of the colonial era, circa 1950, the population of Southeast Asia was only one-third as large as that of Europe—the home of the primary colonial powers that ruled almost all of Southeast Asia for the first half of the twentieth century. Over the course of the last century, there was a dramatic reversal in the demographic balance between Southeast Asia and Europe. At the dawn of the twenty-first century, the population of Indonesia exceeded that of Russia—the largest European country—by almost 100 million. There are currently more Vietnamese and Filipinos than Germans. Thailand—a medium-size Southeast Asian country—has a larger population than either Italy or the United Kingdom. Even tiny Laos, with a population of 6 million in 2010, is home to more people than are many European countries, including Ireland, Finland, Denmark, and Norway. The combined population of the Southeast Asian countries of Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar (Burma), Philippines, Singapore, Thailand, Timor-Leste and Vietnam was near 600 million at the end of the first decade of the twenty-first century. Southeast Asia is projected to be the home of more than 760 million by the middle of the century.4 The role of population in the development of Southeast Asia is generally neglected in both historical and contemporary studies. For example, the celebrated two-volume Cambridge History of Southeast Asia,5 with the exception of essays by Anthony Reid and Norman Owen, largely ignores the role of population in Southeast Asian history. Yet, changes in population size, distribution, and structure are closely intertwined with the economic, social, and political transformations of the last one hundred years. In this chapter, we present a historical overview of contemporary demographic changes in Southeast Asia with primary attention to twentieth-century patterns of population growth, including factors driving fertility and mortality. THE GEOGRAPHICAL CONTEXT There is enormous diversity in all dimensions of Southeast Asian life. The demographic and geographic enormity of Indonesia stands in sharp relief to the tiny microstates of Brunei and Timor-Leste. Over the course of history, variations in topography have created ecological niches within Southeast Asia that have given rise to an incredible diversity of cultures. Rivers and calm seas led to the settlement of fishing villages and coastal trading centers. Lowland areas with natural irrigation or possibilities for flooded fields allowed for wet rice cultivation and the emergence of 4 United Nations (Population Division of the Department of Economic and Social Affairs of the United Nations Secretariat), World Population Prospects: The 2010 Revision (New York, NY: United Nations, 2011), http://esa.un.org/unpd/wpp/Excel-Data/population.htm, accessed January 10, 2012. 5 Tarling, ed., The Cambridge History of Southeast Asia, Volume Two. Population and Society 3 peasant societies and despotic ruling classes. The uplands, which were more difficult for states to control and exploit, were generally inhabited by vibrant and diverse peoples were free from the grip of civilization. The sea, which sometimes serves to isolate Southeast Asia, also brought settlers and visitors from distant shores. For more than a millennium there have been frequent contact, trade, migration, and social exchange from other parts of Asia, and for the past five hundred years, European gunboats and merchants, along with adventurers and missionaries, have arrived as well. Outsiders have been drawn to Southeast Asia by the monsoons and by a desire for the natural and cultivated products of the region. Cultural influences from the outside have blended with local traditions in religion, economic organization, and statecraft. The most significant geographical division has been between the regions, roughly defined as mainland and island Southeast Asia, but there is wide topographical diversity within both areas. Coastal plains, river valleys, highlands, and mountainous regions are found in every country, and often on the same island. Tropical forests have been pushed back for human settlement and cultivation over the centuries. Much of what was once frontier has been settled, to accommodate the major wave of population growth during the twentieth century, but there still remain large expanses of forested areas (although the lucrative timber industry has taken a significant toll on forests in recent decades). Historically, settlement patterns in Southeast Asia were shaped by access to the sea and rivers. Fishing was a ubiquitous means of subsistence, and seaborne exchange and trade were central features of most societies throughout the region. Overland transportation of people and goods was made difficult by tortuous, primitive roadways until well into the twentieth century. Transportation and communication infrastructure were expanded during the colonial era, but priority was given to connecting major cities and selected rural areas where European-owned economic enterprises, such as mines and plantations, were located. Only with the development-minded policies following political independence did modern roads and transportation extend to most of the rural hinterland of Southeast Asia. The primary agricultural crop of Southeast Asia is rice, which is grown in dry fields and in rain-fed or irrigated fields. Since wet rice (grown in irrigated fields) is a more productive crop than dry rice, there has been an evolutionary drift toward wet- rice cultivation accompanying population growth, although the historical trend has been interrupted from time to time. Over the last century, most frontier areas have been settled and irrigated rice fields dot the landscape.6 The scale of human effort necessary to transform tropical forests or swampland into irrigated agricultural fields is possible only with a high population density and a centralized polity to coordinate the construction of irrigation systems.7 The classical civilizations of Angkor, Majapahit, and the Red River Delta, based on large expanses of irrigated rice cultivation, were not determined by favorable geographical settings alone. The differences between the mainland and island Southeast Asia also reflect the influences of culture, religion, and history. Buddhist beliefs, institutions, and traditions have shaped the historical evolution of social patterns and cultures in Burma, Thailand, Laos, Cambodia, and Vietnam. The primary cultural attribute of 6 Lucien Hanks, Rice and Man: Agricultural Ecology in Southeast Asia (Chicago, IL: Aldine, 1972). 7 Ester Boserup, Population and Technological Change (Chicago, IL: University of Chicago Press, 1981). 4 Charles Hirschman and Sabrina
Recommended publications
  • The Great Human Expansion
    The great human expansion Brenna M. Henna, L. L. Cavalli-Sforzaa,1, and Marcus W. Feldmanb,2 aDepartment of Genetics, Stanford University School of Medicine, Stanford, CA 94305; and bDepartment of Biology, Stanford University, Stanford, CA 94305-5020 Edited by C. Owen Lovejoy, Kent State University, Kent, OH, and approved September 25, 2012 (received for review July 19, 2012) Genetic and paleoanthropological evidence is in accord that today’s human population is the result of a great demic (demographic and geographic) expansion that began approximately 45,000 to 60,000 y ago in Africa and rapidly resulted in human occupation of almost all of the Earth’s habitable regions. Genomic data from contemporary humans suggest that this expansion was accompanied by a continuous loss of genetic diversity, a result of what is called the “serial founder effect.” In addition to genomic data, the serial founder effect model is now supported by the genetics of human parasites, morphology, and linguistics. This particular population history gave rise to the two defining features of genetic variation in humans: genomes from the substructured populations of Africa retain an exceptional number of unique variants, and there is a dramatic reduction in genetic diversity within populations living outside of Africa. These two patterns are relevant for medical genetic studies mapping genotypes to phenotypes and for inferring the power of natural selection in human history. It should be appreciated that the initial expansion and subsequent serial founder effect were determined by demographic and sociocultural factors associated with hunter-gatherer populations. How do we reconcile this major demic expansion with the population stability that followed for thousands years until the inventions of agriculture? We review advances in understanding the genetic diversity within Africa and the great human expansion out of Africa and offer hypotheses that can help to establish a more synthetic view of modern human evolution.
    [Show full text]
  • The Interplay of Demographic, Economic
    Journal of Interdisciplinary History, L:4 (Spring, 2020), 495–515. The 50th Year: Special Essay 8 E. Anthony Wrigley The Interplay of Demographic, Economic, and Social History The wealth of source material for various aspects of the demographic, economic, and social history of England Downloaded from http://direct.mit.edu/jinh/article-pdf/50/4/495/1702688/jinh_a_01483.pdf by guest on 27 September 2021 over the past half millennium makes it possible to describe, for ex- ample, urban growth and related changes in occupational structure, or changes in county population densities and their concomitants, often in considerable detail. However, although description may be feasible, explanation often presents problems. It is normally the case that a number of factors are involved, and determining their relative importance often presents severe difficulties and results in arbitrary decisions. In many sciences, if a similar problem is faced, controlled experiments can sometimes overcome it. The nature of historical in- formation rules out comparable procedures. For example, one of the most striking changes taking place in England in the early modern period was the rapid increase in the proportion of the population living in towns with a matching rise in agricultural productivity to supply town dwellers with the necessities of life. It is reasonable to assume that the urban growth that occurred would have been re- duced if agricultural productivity had risen more slowly, but it is not possible to test this assumption to establish, for example, the scale of the impact on urban growth if gross cereal yields had risen by a half between 1600 and 1800 rather than doubling.
    [Show full text]
  • The Comparative Study of Population Dynamics in Late Imperial China
    Center for Studies in Demography and Ecology Revising the Malthusian Narrative: the Comparative Study of Population Dynamics in Late Imperial China by WILLIAM LAVELY University of Washington R. BIN WONG University of California-Irvine UNIVERSITY OF WASHINGTON CSDE Working Paper No. 98-05 REVISING THE MALTHUSIAN NARRATIVE: THE COMPARATIVE STUDY OF POPULATION DYNAMICS IN LATE IMPERIAL CHINA WILLIAM LAVELY University of Washington R. BIN WONG University of California-Irvine 3 February 1998. A preliminary paper addressing some of these issues was presented at the Annual Meeting of the Association for Asian Studies, New Orleans, April 11-14, 1991. G. William Skinner and Susan Watkins made constructive criticisms of that effort which inspired the present work. G. William Skinner, James Lee, Timothy Brook, Kenneth Pommeranz and an anonymous reviewer provided valuable comments on an earlier draft of this article. The authors alone are responsible for remaining errors. This article complements the comparisons of Chinese and European patterns of economic and political change in Wong’s China Transformed: Historical change and the limits of European experience (Cornell 1997). William Lavely and R. Bin Wong, page 3 Ever since Malthus, it has been conventional to cast the Chinese and European pre-industrial demographic systems as opposing archetypes. Europe's system was characterized by moderate population growth, fertility control keyed to economic conditions, and favorable living standards, compared with China’s rapid growth, periodic mortality crises, and precarious balance of population and resources. Although there is some variation in approaches and vocabularies reflecting disciplinary divisions, and recognition of the substantial variability of institutions within Europe and China, this stylized contrast continues to flourish in the demographic and historical literatures.
    [Show full text]
  • Why Hunter-Gatherer Populations Do Not Show Signs of Pleistocene Demographic Expansions
    Proc. Natl. Acad. Sci. USA Vol. 96, pp. 10597–10602, September 1999 Anthropology Why hunter-gatherer populations do not show signs of Pleistocene demographic expansions LAURENT EXCOFFIER† AND STEFAN SCHNEIDER Genetics and Biometry Laboratory, Department of Anthropology, University of Geneva, CP 24, 1211 Geneva 24, Switzerland Communicated by Henry C. Harpending, University of Utah, Salt Lake City, UT, July 13, 1999 (received for review January 26, 1999) ABSTRACT The mitochondrial DNA diversity of 62 hu- some Amerindian populations and some hunter-gatherer pop- man population samples was examined for potential signals of ulations (HGPs) from different continents. A multivariate population expansions. Stepwise expansion times were esti- analysis of genetic distances reveals that the most divergent mated by taking into account heterogeneity of mutation rates populations do not show signs of Pleistocene expansions, among sites. Assuming an mtDNA divergence rate of 33% per particularly in Africa and in America. Otherwise, the genetic million years, most populations show signals of Pleistocene affinities among populations are found in good agreement with expansions at around 70,000 years (70 KY) ago in Africa and geography. The puzzling lack of signal of Pleistocene expan- Asia, 55 KY ago in America, and 40 KY ago in Europe and the sions in hunter-gatherers is discussed. We propose that the Middle East, whereas the traces of the oldest expansions are Holocene HGPs lost previous signals of Pleistocene expan- found in East Africa (110 KY ago for the Turkana). The sions because of post-Neolithic population bottlenecks; this genetic diversity of two groups of populations (most Amerin- conclusion is supported by computer simulations.
    [Show full text]
  • Historical Demogrphy Sources
    DEMOGRAPHY AND SOCIOLOGY PROGRAM RESEARCH SCHOOL OF SOCIAL SCIENCES SOURCES FOR AUSTRALIAN HISTORICAL DEMOGRAPHY Rebecca Kippen David Lucas Working Papers in Demography No. 93 March 2004 Working Papers in Demography No. 93 SOURCES FOR AUSTRALIAN HISTORICAL DEMOGRAPHY Rebecca Kippen, Demography and Sociology Program, Australian National University David Lucas, Demography and Sociology Program, Australian National University In addition to providing the story of past populations, historical demography helps inform us why populations are the way they are, and allows us some insight into population futures. Historical demography uses a plethora of sources, however these sources are scattered and not always easily accessible. This paper draws attention to a number of sources for Australian historical demography, both those that are currently exploited and others that we hope may be exploited in the future. This paper adopts broader definitions than do Pressat and Wilson (1985: 52, 95–96), who define historical demography as the ‘application of techniques of demographic analysis to historical source material’, and demographic analysis as a ‘form of statistical analysis which employs, for the most part, a modest array of mathematical and statistical techniques to deal with the data produced by censuses, surveys and vital registration systems’. According to Kertzer (1997: 843–844), ‘the traditional questions of interest to demographers cannot be satisfactorily answered by quantitative materials and statistical analysis alone’. Quantitative methods need to be combined with ‘more traditional historiographical methods, drawing upon various sorts of archival materials’. Kertzer feels that ‘demographic change cannot be wholly understood without paying attention to historical detail that is not in itself discoverable through quantitative materials’ (Kertzer 1997: 841).
    [Show full text]
  • Genomic Insights Into the Demographic History of Southern
    bioRxiv preprint doi: https://doi.org/10.1101/2020.11.08.373225; this version posted November 8, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC 4.0 International license. Genomic Insights into the Demographic History of Southern Chinese Xiufeng Huang1,#, Zi-Yang Xia2,3,4,#*, Xiaoyun Bin1,#, Guanglin He2, Jianxin Guo2, Chaowen Lin1, Lianfei Yin1, Jing Zhao2, Zhuofei Ma1, Fuwei Ma1, Yingxiang Li2, Rong Hu2, Lan-Hai Wei2, Chuan-Chao Wang2,* 1. College of Basic Medical Sciences, Youjiang Medical University for Nationalities, Baise, Guangxi 533000, China 2. Department of Anthropology and Ethnology, Institute of Anthropology, School of Sociology and Anthropology, and National Institute for Data Science in Health and Medicine, School of Life Sciences, Xiamen University, Xiamen 361005, China 3. Division of Biosciences, University College London, London WC1E 6BT, United Kingdom 4. Ministry of Education Key Laboratory of Contemporary Anthropology, Department of Anthropology and Human Genetics, School of Life Sciences, Fudan University, Shanghai 200438, China # These authors contributed equally to this work. * Corresponding author: Professor Chuan-Chao Wang ([email protected]) and Zi-Yang Xia ([email protected]). ABSTRACT Southern China is the birthplace of rice-cultivating agriculture, different language families, and human migrations that facilitated these cultural diffusions. The fine-scale demographic history in situ, however, remains unclear. To comprehensively cover the genetic diversity in East and Southeast Asia, we generated genome-wide SNP data from 211 present-day Southern Chinese and co-analyzed them with more than 1,200 ancient and modern genomes.
    [Show full text]
  • Past and Projected Growth of Australia's Older Migrant Populations
    Wilson et al. Genus (2020) 76:20 https://doi.org/10.1186/s41118-020-00091-6 Genus ORIGINAL ARTICLE Open Access Past and projected growth of Australia’s older migrant populations Tom Wilson1 , Peter McDonald1 , Jeromey Temple1* , Bianca Brijnath2 and Ariane Utomo3 * Correspondence: jeromey. [email protected] Abstract 1 Demography and Ageing Unit, ’ Melbourne School of Population In recent years, Australia s older population (aged 65 and over) has been growing and Global Health, University of rapidly, accompanied by a shift in its country of birth composition. Although a great Melbourne, 207 Bouverie St, deal of research has been undertaken on past and current aspects of Australia’s Melbourne, Victoria 3010, Australia Full list of author information is migrant groups, little attention has been paid to future demographic trends in older available at the end of the article populations. The aim of this paper is to examine recent and possible future demographic trends of Australia’s migrant populations at the older ages. We present population estimates by country and broad global region of birth from 1996 to 2016, and then new birthplace-specific population projections for the 2016 to 2056 period. Our findings show that substantial growth of the 65+ population will occur in the coming decades, and that the overseas-born will shift from a Europe-born dominance to an Asia-born dominance. Cohort flow (the effect of varying sizes of cohorts moving into the 65+ age group over time) will be the main driver of growth for most older birthplace populations. The shifting demography of Australia’s older population signals many policy, planning, service delivery and funding challenges for government and private sector providers.
    [Show full text]
  • Measuring Race and Ethnicity in the Censuses of Australia, Canada, and the United States: Parallels and Paradoxes
    Canadian Studies in Population 42, no. 1–2 (2015): 13–34. Measuring race and ethnicity in the censuses of Australia, Canada, and the United States: Parallels and paradoxes Gillian Stevens1 Hiromi Ishizawa Douglas Grbic Abstract Most national censuses include questions about race, colour, national origins, ethnicity, ancestry, and tribe in an effort to describe subgroups within their population. In this paper, we focus on changes over the last half-century in the racial and ethnic classification schemes of the censuses in three countries that share important historical and demographic features—Australia, Canada, and the United States. We show that there are similarities, as well as some idiosyncratic features, in how these three nations define and describe racial and ethnic subgroups. We then argue that the gathering of data on the racial/ethnic subgroups in these three nations has followed a similar progression over the last half-century because of shifts in the understanding of race and ethnicity, data-gathering procedures, and the ongoing dialogue between each national population and its data-gathering institution. Keywords: census; measurement; race; ethnicity. Résumé La plupart des recensements nationaux incluent des questions sur la race, la couleur, les origines ethniques, l’ascendance et la tribu dans le but de décrire les sous-groupes de la population. Dans cet article, nous ciblons les changements des cinquante dernières années dans les schémas de classification raciale et ethnique des recensements de trois pays, à savoir l’Australie, le Canada et les États-Unis, qui partagent tous d’importantes caractéristiques sur le plan historique et démographique. Nous démontrons qu’il existe des similarités et des caractéristiques idiosyncratiques dans la manière dont ces trois pays définissent et décrivent les sous-groupes raciaux et ethniques.
    [Show full text]
  • Colonialism, Globalization and the Economy of South-East India, C.1700-1900 David Washbrook
    Colonialism, Globalization And The Economy Of South-East India, C.1700-1900 David Washbrook It is not easy to write the ‘long-term’ economic history of any region in India -- which may account for the fact that very few such histories have been written. One obvious problem concerns the availability of data: where a paucity of sources for the pre-colonial period suddenly becomes replaced by a superfluity for the colonial epoch, but many of doubtful validity. Also, it is difficult to think through the economic implications of the profound social changes, which took place in the 19th century and which challenge any simple notions of continuity. Indian regional economies may have been as ultimately dependent on the plough in 1900 as in 1700 but, surrounding that, virtually everything else was different. Whereas in 1700, south-east India had been an important part of a textile manufacturing industry of world significance, by 1900 it stood on the agrarian periphery of an entirely different global economic order. Whereas in 1700, it possessed large centres of local expenditure and consumption (in the palaces of its rulers and the bazaars of its many armies), by 1900 much of its surplus was being expended and consumed elsewhere. Whereas, still in 1700, much of its population was highly mobile and moved sub-regionally to take advantage of opportunities, by 1900 they had become more sedentary and, indeed, were beginning to experience shortages of land and resources. But, conversely, history did not only chart out a course of increasing hardship and decline. Whereas in 1700, society lived with the ever-present threat of famine, by 1900 total crop-failures had become rarer – and better means to cope with them had been devised.
    [Show full text]
  • A Malthusian-Frontier Interpretation of United States Demographic History Before C
    Document generated on 09/27/2021 6:43 a.m. Urban History Review Revue d'histoire urbaine A Malthusian-Frontier Interpretation of United States Demographic History Before c. 1815 Daniel Scott Smith Urbanization in the Americas : The Background in Comparative Article abstract Perspective The combination of a three per cent rate of population growth and an absence Special Issue, 1980 of per capita economic growth was fundamental to the history of the British colonies in North America and the early United States. These characteristics URI: https://id.erudit.org/iderudit/1020691ar sharply differed from the economy and demography of the nineteenth century DOI: https://doi.org/10.7202/1020691ar United States and from the experience of other societies. These distinctive features had significant consequences; the "Malthusian-frontier" regime helps to explain the extremely slow pace of urbanization, the stability in the See table of contents inequality of wealth, and the pattern of conflict and elite domination in politics. Although rapid natural increase created economic, social, and political difficulties, migration toward the frontier served to equilibrate the system. Publisher(s) Using data from late eighteenth century New England towns, the paper demonstrates how migration tended to act as a homeostatic mechanism but Urban History Review / Revue d'histoire urbaine also argues that out-migrants from more densely-settled areas were pushed rather than pulled. Several factors account for the "stickiness" of the migration ISSN process. Throughout, the essay illustrates the utility of a systemic approach to 0703-0428 (print) demographic history. 1918-5138 (digital) Explore this journal Cite this article Smith, D.
    [Show full text]
  • The Y Chromosome As a Storyteller Jaume Bertranpetit* Facultat De Cie`Ncies De La Salut I De La Vida, Universitat Pompeu Fabra, Barcelona, Catalonia, Spain
    Commentary Genome, diversity, and origins: The Y chromosome as a storyteller Jaume Bertranpetit* Facultat de Cie`ncies de la Salut i de la Vida, Universitat Pompeu Fabra, Barcelona, Catalonia, Spain nalysis of human genome variation concerning the accuracy of our knowledge tion. The new analysis (2) on the same Amay focus on one of two possible goals: of genome dynamics, worries concerning chromosome gives only one-third of the understanding the genome region under the ability and power to detect specific pro- time. It is thus an interesting new proposal study or solving historical and evolutionary cesses and disentangle cases where more not only in human evolution but also in questions specific to the population(s) ana- than one mechanism may have produced human evolutionary genetics. It could mean lyzed. Understanding of variation of a given similar genetic patterns, and worries con- that a population with modern characteris- genome region has a genetic interest be- cerning the appropriateness of evolutionary tics had to exist in Africa 50,000 ya and cause it is a consequence of the dynamics of models needed for the inference. And fi- spread later to Eurasia and the rest of the the genome and thus the evolutionary forces nally there have been worries from anthro- world. Besides the concordance of this pro- (mutation, selection in its varieties, drift, pologists who do not perceive the interface posal with archaeological evidence, there recombination, . ) may be understood. It between the evolutionary biology of a spe- are more strictly genetic issues to be dis- is thus a way to understand the mechanisms cies and that of tiny fragments of DNA, cussed, namely the limitations of the theory that produce variation in the genome.
    [Show full text]
  • The Great Human Expansion
    The great human expansion Brenna M. Henna, L. L. Cavalli-Sforzaa,1, and Marcus W. Feldmanb,2 aDepartment of Genetics, Stanford University School of Medicine, Stanford, CA 94305; and bDepartment of Biology, Stanford University, Stanford, CA 94305-5020 Edited by C. Owen Lovejoy, Kent State University, Kent, OH, and approved September 25, 2012 (received for review July 19, 2012) Genetic and paleoanthropological evidence is in accord that today’s human population is the result of a great demic (demographic and geographic) expansion that began approximately 45,000 to 60,000 y ago in Africa and rapidly resulted in human occupation of almost all of the Earth’s habitable regions. Genomic data from contemporary humans suggest that this expansion was accompanied by a continuous loss of genetic diversity, a result of what is called the “serial founder effect.” In addition to genomic data, the serial founder effect model is now supported by the genetics of human parasites, morphology, and linguistics. This particular population history gave rise to the two defining features of genetic variation in humans: genomes from the substructured populations of Africa retain an exceptional number of unique variants, and there is a dramatic reduction in genetic diversity within populations living outside of Africa. These two patterns are relevant for medical genetic studies mapping genotypes to phenotypes and for inferring the power of natural selection in human history. It should be appreciated that the initial expansion and subsequent serial founder effect were determined by demographic and sociocultural factors associated with hunter-gatherer populations. How do we reconcile this major demic expansion with the population stability that followed for thousands years until the inventions of agriculture? We review advances in understanding the genetic diversity within Africa and the great human expansion out of Africa and offer hypotheses that can help to establish a more synthetic view of modern human evolution.
    [Show full text]