Population Continuity and Replacement in the Pre-contact Valley of Mexico

2018 ◽  
pp. 37-69
Author(s):  
COREY S. RAGSDALE ◽  
HEATHER J. H. EDGAR
Keyword(s):  
Population Continuity

The Peopling of the Baraba Forest-Steppe in the Neolithic: Cranial Evidence

2021 ◽  
Vol 49 (1) ◽  
pp. 133-146
Author(s):  
T. A. Chikisheva ◽  
D. V. Pozdnyakov
Keyword(s):  
Local Population ◽  
Principal Component ◽  
Early Holocene ◽  
Russian Plain ◽  
Northern Eurasia ◽  
Forest Steppe ◽  
Early Neolithic ◽  
Population Continuity ◽  
Lake Systems

On the basis of statistical analysis of craniometric data relating to Mesolithic and Neolithic samples from northern Eurasia, we discuss the peopling of the Baraba forest-steppe in the Early Holocene. This region is represented by samples from Sopka-2/1 (early sixth millennium BC), Protoka (late fifth to early fourth millennia BC), Korchugan (early-mid sixth millennium BC), and Vengerovo-2A (late sixth millennium BC). The results of the principal component analysis are interpreted in the context of debates over the role of autochthonous traditions in the Neolithic. During the Preboreal period (10 ka BP), large parts of the Baraba forest-steppe were flooded by the transgression of lake systems during climatic warming. This may have caused depopulation, lasting for at least a millennium. The Early Holocene people of Baraba were an offshoot of Meso-Neolithic populations of the northwestern Russian Plain. On that basis, the Early Neolithic populations of Baraba were formed. Direct population continuity is traceable only through the Chalcolithic. Since the late sixth millennium BC, however, the local population had incorporated migrants from the Pit-Comb Ware area in the central Russian Plain and, indirectly (via the Neolithic Altai), from the Cis-Baikal area.

scholarly journals An Ancient Baboon Genome Demonstrates Long-Term Population Continuity in Southern Africa

2020 ◽  
Vol 12 (4) ◽  
pp. 407-412 ◽  
Author(s):  
Iain Mathieson ◽  
Federico Abascal ◽  
Lasse Vinner ◽  
Pontus Skoglund ◽  
Cristina Pomilla ◽  
...  
Keyword(s):  
Southern Africa ◽  
Nonhuman Primates ◽  
Demographic History ◽  
Structured Populations ◽  
Human Populations ◽  
Papio Ursinus ◽  
Anthropological Research ◽  
Population Continuity ◽  
High Degree

Abstract Baboons are one of the most abundant large nonhuman primates and are widely studied in biomedical, behavioral, and anthropological research. Despite this, our knowledge of their evolutionary and demographic history remains incomplete. Here, we report a 0.9-fold coverage genome sequence from a 5800-year-old baboon from the site of Ha Makotoko in Lesotho. The ancient baboon is closely related to present-day Papio ursinus individuals from southern Africa—indicating a high degree of continuity in the southern African baboon population. This level of population continuity is rare in recent human populations but may provide a good model for the evolution of Homo and other large primates over similar timespans in structured populations throughout Africa.

scholarly journals Effect of population structure and migration when investigating genetic continuity using ancient DNA

2016 ◽  
Author(s):  
NM Silva ◽  
S Kreutzer ◽  
C Papageorgopoulou ◽  
M Currat
Keyword(s):  
Population Structure ◽  
Ancient Dna ◽  
Isolated Populations ◽  
Hunter Gatherers ◽  
History Of ◽  
Genetic Continuity ◽  
Population Continuity ◽  
Local Hunter ◽  
And Migration ◽  
Genetic Pool

AbstractRecent advances in sequencing techniques provide means to access direct genetic snapshots from the past with ancient DNA data (aDNA) from diverse periods of human prehistory. Comparing samples taken in the same region but at different time periods may indicate if there is continuity in the peopling history of that area or if a large genetic input, such as an immigration wave, has occurred. Here we propose a new modeling approach for investigating population continuity using aDNA, including two fundamental elements in human evolution that were absent from previous methods: population structure and migration. The method also considers the extensive temporal and geographic heterogeneity commonly found in aDNA datasets. We compare our spatially-explicit approach to the previous non-spatial method and show that it is more conservative and thus suitable for testing population continuity, especially when small, isolated populations, such as prehistoric ones, are considered. Moreover, our approach also allows investigating partial population continuity and we apply it to a real dataset of ancient mitochondrial DNA. We estimate that 91% of the current genetic pool in central Europe entered the area with immigrant Neolithic farmers, but a genetic contribution of local hunter-gatherers as large as 83% cannot be entirely ruled out.

scholarly journals Diapause of Cameraria ohridella Deschka et Dimic and its impact on the species population dynamics

2012 ◽  
Vol 49 (No. 6) ◽  
pp. 252-258 ◽  
Author(s):  
T. Samek
Keyword(s):  
Regression Analysis ◽  
First Generation ◽  
Horse Chestnut ◽  
Third Generation ◽  
The Czech Republic ◽  
The Third ◽  
Species Population ◽  
Unfavourable Weather ◽  
Population Continuity ◽  
Actual Damage

Cameraria ohridella Deschka et Dimic is a polyvoltine species which can complete under suitable conditions the development of as many as three generations a year. In the Czech Republic, however, the third generation suffers from high mortality due to the shortage of food and later also unfavourable weather. If the third generation is not completed the population continuity is ensured by diapausing pupae occurring in each generation. The number of diapausing pupae is determined by the actual abundance of the species and thus also by the actual damage to the horse chestnut (Aesculus hippocastanum L.) foliage. Relationships of the parameters were investigated in the first generation of C. ohridella and their intensity was studied by methods of regression analysis.

scholarly journals Bayesian estimation of partial population continuity using ancient DNA and spatially explicit simulations

2018 ◽  
Vol 11 (9) ◽  
pp. 1642-1655 ◽  
Author(s):  
Nuno Miguel Silva ◽  
Jeremy Rio ◽  
Susanne Kreutzer ◽  
Christina Papageorgopoulou ◽  
Mathias Currat
Keyword(s):  
Bayesian Estimation ◽  
Ancient Dna ◽  
Spatially Explicit ◽  
Population Continuity ◽  
Partial Population

scholarly journals Building a method for the study of the Mesolithic Neolithic transition in Portugal

2004 ◽  
Vol 31 ◽  
pp. 88-111 ◽  
Author(s):  
Mary Jackes ◽  
Christopher Meiklejohn
Keyword(s):  
Age Assessment ◽  
Neolithic Transition ◽  
Agricultural Transition ◽  
Regional Population ◽  
Population Continuity ◽  
Historical Issues ◽  
Number Of Individuals ◽  
Skeletal Samples ◽  
Late Mesolithic

This paper focuses on the agricultural transition in Portugal and on demography across this transition, concentrating on two key skeletal samples, the Mesolithic shell midden of Cabeco da Arruda and the Neolithic burial cave of Casa da Moura. It extends our previous work on the demography of the transition and the methodology surrounding its determination. We explain our method for determination of the number of individuals in samples where whole skeletons cannot be used. We then concentrate on the estimation of fertility, placing it within limits of biological feasibility, sample inadequacies, and vagaries of age assessment. From our analysis, which includes an examination of historical issues with the sites, we argue for regional population continuity between 8000 and 6000 cal BP, and suggest that Neolithic life-ways slowly intensified, founded on important elements deriving from the late Mesolithic, with changes that included increased fertility through shortening of the birth interval

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