scholarly journals Male Demography in East Asia: A North–South Contrast in Human Population Expansion Times

Genetics ◽  
2006 ◽  
Vol 172 (4) ◽  
pp. 2431-2439 ◽  
Author(s):  
Yali Xue ◽  
Tatiana Zerjal ◽  
Weidong Bao ◽  
Suling Zhu ◽  
Qunfang Shu ◽  
...  
2000 ◽  
Vol 17 (5) ◽  
pp. 757-767 ◽  
Author(s):  
Lev A. Zhivotovsky ◽  
Lynda Bennett ◽  
Anne M. Bowcock ◽  
Marcus W. Feldman

1980 ◽  
Vol 7 (3) ◽  
pp. 207-212 ◽  
Author(s):  
Timothy A. Afolayan

Conservation and utilization of wildlife resources are not new among our local communities in Nigeria, although the present approach to the management of these resources is very recent. Modern technology, urbanization, and human population expansion, have caused the destruction of many indigenous animal and plant species in Nigeria.This paper highlights the recent developments in the overall conservation programme in Nigeria. It describes the important role which wildlife is playing in helping to feed the nation, in creating employment opportunities, in education, in research, in recreation, and in local medicine. Inadequacy of Nigerian wildlife legislation and of trained manpower to protect and manage the wildlife resources are among the crucial wildlife management problems identified in this paper. It is also stressed that the basic information for effective management is often lacking where Nigerian wildlife reserves are concerned.


2020 ◽  
Vol 12 (5) ◽  
pp. 553-565 ◽  
Author(s):  
Jungeun Kim ◽  
Sungwon Jeon ◽  
Jae-Pil Choi ◽  
Asta Blazyte ◽  
Yeonsu Jeon ◽  
...  

Abstract Koreans are thought to be an ethnic group of admixed northern and southern subgroups. However, the exact genetic origins of these two remain unclear. In addition, the past admixture is presumed to have taken place on the Korean peninsula, but there is no genomic scale analysis exploring the origin, composition, admixture, or the past migration of Koreans. Here, 88 Korean genomes compared with 91 other present-day populations showed two major genetic components of East Siberia and Southeast Asia. Additional paleogenomic analysis with 115 ancient genomes from Pleistocene hunter-gatherers to Iron Age farmers showed a gradual admixture of Tianyuan (40 ka) and Devil’s gate (8 ka) ancestries throughout East Asia and East Siberia up until the Neolithic era. Afterward, the current genetic foundation of Koreans may have been established through a rapid admixture with ancient Southern Chinese populations associated with Iron Age Cambodians. We speculate that this admixing trend initially occurred mostly outside the Korean peninsula followed by continuous spread and localization in Korea, corresponding to the general admixture trend of East Asia. Over 70% of extant Korean genetic diversity is explained to be derived from such a recent population expansion and admixture from the South.


1970 ◽  
Vol 11 (2) ◽  
pp. 239-257
Author(s):  
Arafaine Zenebe ◽  
Asefa Addisu

Kafta-Sheraro National Park (KSNP) is one of the most important protected areas in Ethiopia and provides a number of important ecological and hydrological benefits to the local people. However, the park is under immense pressure as a result of a rapidly increasing human population that resulted from a voluntary resettlement program launched by the government in 2003. Using satellite imageries taken in the years 2003, 2009 and 2015, this study examined patterns of changes in land use/cover throughout the park over a 12 year period (2003 to 2015), during which human population pressure is known to have increased over time and changes in government policies were taken place. The results showed that, over the period of 12 years, wood land experienced the most changeover the study period, with a loss of cover of 862.3 km2 (i.e. from 77.8% coverage of the total park area in 2003 to 38.0% in 2015) at annual rate of 79.3 km2). Conversely, the other land cover types showed increasing pattern, particularly, bush land and agricultural land were increasing at a rate of 44.96 and 18.90 km2 per year, respectively. Overall, the rate of land cover change was higher during the first period (2003 to 2009) compared with the second period (2009 to 2015) for all land use and land cover types, except grass land, suggesting that human impacts were higher following the resettlement program in 2003 and then slowed down following establishment of the park in 2007. The major causes of land cover change in the area were settlement and population expansion, cultivation, fire, mining and grazing. We suggest that better effective park protection systems should be in place to mitigate and restore habitats.


Science ◽  
2020 ◽  
pp. eaba0909 ◽  
Author(s):  
Melinda A. Yang ◽  
Xuechun Fan ◽  
Bo Sun ◽  
Chungyu Chen ◽  
Jianfeng Lang ◽  
...  

Human genetic history in East Asia is poorly understood. To clarify population relationships, we obtained genome wide data from 26 ancient individuals from northern and southern East Asia spanning 9,500-300 years ago. Genetic differentiation was higher in the past than the present, reflecting a major episode of admixture involving northern East Asian ancestry spreading across southern East Asia after the Neolithic, transforming the genetic ancestry of southern China. Mainland southern East Asian and Taiwan Strait island samples from the Neolithic show clear connections with modern and ancient samples with Austronesian-related ancestry, supporting a southern China origin for proto-Austronesians. Connections among Neolithic coastal groups from Siberia and Japan to Vietnam indicate that migration and gene flow played an important role in the prehistory of coastal Asia.


The Holocene ◽  
2019 ◽  
Vol 29 (5) ◽  
pp. 816-829 ◽  
Author(s):  
Rachid Cheddadi ◽  
Alessio Palmisano ◽  
José Antonio López-Sáez ◽  
Madja Nourelbait ◽  
Christoph Zielhofer ◽  
...  

The aim of this work is to reconstruct the periods of growth and decline of human populations in Morocco and their potential impacts on the landscape over the past 10,000 years. In order to estimate the trends in the human population size between 10,000 and 3000 years ago, we used a summed probability distribution (SPD) of radiocarbon dates from a wide range of archaeological sites throughout Morocco. Landscape changes were identified and quantified from a dataset of fossil pollen records. Different anthropogenic pollen markers, as well as natural vegetation groups and taxonomic richness were used to analyse the relationship between long-term trends in human population expansion or regression and type of impact on the landscape. The sub-regions of Morocco have different topographies and climates, which have either favoured or prevented the establishment and/or spread of human populations. In order to identify the areas most significantly impacted by humans and the timing of such impacts, we have reconstructed and compared the same past anthropogenic and landscape proxies along with the population trends within the lowlands and mountainous areas. The lowlands were more strongly impacted earlier in the Holocene than the mountainous areas. Anthropogenic markers indicate that farming expanded in the lowlands during the first major expansion of human populations between ca. 7200 and 6700 cal. yr BP at the start of the Neolithic period. In the Atlas and Rif Mountains, anthropogenic impact is not clearly detectable in any of these areas before 4000 cal. BP.


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