scholarly journals Craniometric data support a mosaic model of demic and cultural Neolithic diffusion to outlying regions of Europe

2011 ◽  
Vol 278 (1720) ◽  
pp. 2874-2880 ◽  
Author(s):  
Noreen von Cramon-Taubadel ◽  
Ron Pinhasi
Keyword(s):  
Gene Flow ◽  
Cultural Transmission ◽  
Complete Replacement ◽  
Cultural Elements ◽  
Near Eastern ◽  
Farming Communities ◽  
Geographical Regions ◽  
Significant Gene ◽  
Transition To Agriculture ◽  
Outlying Regions

The extent to which the transition to agriculture in Europe was the result of biological (demic) diffusion from the Near East or the adoption of farming practices by indigenous hunter–gatherers is subject to continuing debate. Thus far, archaeological study and the analysis of modern and ancient European DNA have yielded inconclusive results regarding these hypotheses. Here we test these ideas using an extensive craniometric dataset representing 30 hunter–gatherer and farming populations. Pairwise population craniometric distance was compared with temporally controlled geographical models representing evolutionary hypotheses of biological and cultural transmission. The results show that, following the physical dispersal of Near Eastern/Anatolian farmers into central Europe, two biological lineages were established with limited gene flow between them. Farming communities spread across Europe, while hunter–gatherer communities located in outlying geographical regions adopted some cultural elements from the farmers. Therefore, the transition to farming in Europe did not involve the complete replacement of indigenous hunter–gatherer populations despite significant gene flow from the Southwest Asia. This study suggests that a mosaic process of dispersal of farmers and their ideas was operating in outlying regions of Europe, thereby reconciling previously conflicting results obtained from genetic and archaeological studies.

Unexpected hybridization patterns in Near Eastern terrapins (Mauremys caspica,M. rivulata) indicate ancient gene flow across the Fertile Crescent

2016 ◽  
Vol 46 (4) ◽  
pp. 401-413 ◽  
Author(s):  
Melita Vamberger ◽  
Heiko Stuckas ◽  
Mario Vargas-Ramírez ◽  
Christian Kehlmaier ◽  
Dinçer Ayaz ◽  
...  
Keyword(s):  
Gene Flow ◽  
Near Eastern ◽  
Fertile Crescent ◽  
Ancient Gene ◽  
Mauremys Caspica

scholarly journals Genomic Adaptations to Salinity Resist Gene Flow in the Evolution of Floridian Watersnakes

2020 ◽  
Author(s):  
Rhett M Rautsaw ◽  
Tristan D Schramer ◽  
Rachel Acuña ◽  
Lindsay N Arick ◽  
Mark DiMeo ◽  
...  
Keyword(s):  
Gene Flow ◽  
Isolation By Distance ◽  
Species Boundaries ◽  
Selective Pressures ◽  
Nerodia Fasciata ◽  
Isolation By Environment ◽  
Significant Gene ◽  
Candidate Loci ◽  
Osmoregulatory Function ◽  
Ecological Differences

Abstract The migration-selection balance often governs the evolution of lineages, and speciation with gene flow is now considered common across the tree of life. Ecological speciation is a process that can facilitate divergence despite gene flow due to strong selective pressures caused by ecological differences; however, the exact traits under selection are often unknown. The transition from freshwater to saltwater habitats provides strong selection targeting traits with osmoregulatory function. Several lineages of North American watersnakes (Nerodia spp.) are known to occur in saltwater habitat and represent a useful system for studying speciation by providing an opportunity to investigate gene flow and evaluate how species boundaries are maintained or degraded. We use double digest restriction-site associated DNA sequencing to characterize the migration-selection balance and test for evidence of ecological divergence within the Nerodia fasciata-clarkii complex in Florida. We find evidence of high intraspecific gene flow with a pattern of isolation-by-distance underlying subspecific lineages. However, we identify genetic structure indicative of reduced gene flow between inland and coastal lineages suggesting divergence due to isolation-by-environment. This pattern is consistent with observed environmental differences where the amount of admixture decreases with increased salinity. Furthermore, we identify significantly enriched terms related to osmoregulatory function among a set of candidate loci, including several genes that have been previously implicated in adaptation to salinity stress. Collectively, our results demonstrate that ecological differences, likely driven by salinity, cause strong divergent selection which promotes divergence in the N. fasciata-clarkii complex despite significant gene flow.

scholarly journals Analysis of genetic population structure and diversity in Mallotus oblongifolius using ISSR and SRAP markers

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7173 ◽  
Author(s):  
Wuping Yan ◽  
Juanling Li ◽  
Daojun Zheng ◽  
Cynthia Friedman ◽  
Huafeng Wang
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Hainan Island ◽  
Issr Markers ◽  
Adaptive Divergence ◽  
Group Method ◽  
Market Demand ◽  
Srap Markers ◽  
Clustering Model ◽  
Geographical Regions

Background Mallotus oblongifolius, an evergreen shrub endemic to Hainan Island, China, is important both medicinally and economically. Due to its special medicinal significance and the continuing rise of market demand, its populations in the wild have been subject to long-term illegal and unrestrained collection. Hence, an evaluation of genetic variability is essential for the conservation and genetic reserve development of this species. Methods Sequence-related amplified polymorphism (SRAP) and inter-simple sequence repeat (ISSR) markers were employed to assess the genetic diversity and genetic structure of 20 natural populations of M. oblongifolius growing in different eco-geographical regions of Hainan Island, China. Results We revealed a considerable genetic diversity (h = 0.336, I = 0.5057, SRAP markers; h = 0.3068, I = 0.4657, ISSR markers) and weak genetic differentiation (Gst = 0.2764 for SRAP, Gst = 0.2709 for ISSR) with the same gene flow (Nm = 1.3092 for SRAP, Nm = 1.346 for ISSR) among the M. oblongifolius populations. The Mantel Test showed that the distribution of genetic variation among populations could not be explained by the pronounced geographical distances (r = 0.01255, p = 0.5538). All results of the Unweighted Pair Group Method with Arithmetic Mean (UPGMA), Neighbor-joining (NJ), Principal Coordinate Analysis (PCoA) and Bayesian analyses supported a habitat-specific genetic clustering model for M. oblongifolius, indicating a local adaptive divergence for the studied populations. Discussion We suggested that the habitat fragmentation and specificity for M. oblongifolius populations weakened the natural gene flow and promoted an adaptation to special habitats, which was the main reason for local adaptive divergence among M. oblongifolius.

scholarly journals Microsatellite Characterization of Malaysian Mahseer (Tor spp.) for Improvement of Broodstock Management and Utilization

Animals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2633
Author(s):  
Poh Chiang Chew ◽  
Annie Christianus ◽  
Jaapar M. Zudaidy ◽  
Md Yasin Ina-Salwany ◽  
Chou Min Chong ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Genetic Differentiation ◽  
Genetic Relatedness ◽  
Genetic Distances ◽  
Group Method ◽  
Genetic Management ◽  
Principal Coordinates Analysis ◽  
Principal Coordinates ◽  
Geographical Regions

In this study, a mixture of Tor tambra and T. tambroides with unknown genetic background were collected from 11 localities in Malaysia for broodstock development and sperm cryo-banking. This study aims to assess the microsatellite (simple sequence repeat, SSR) variation, genetic diversity, genetic differentiation, level of gene flow, population structure, genetic relatedness and their demographic aspects among these Tor populations, in addition to establishing their SSR profile by employing 22 SSR markers via fragment analysis. Total genomic DNA was extracted from 181 samples (91 cryopreserved milt samples and 90 scale samples of live broodfish). Results showed the Tor spp. collection retained their genetic variation but exhibited excessive homozygosity among individuals within population. Moderate genetic differentiation was shown among the populations, with highly significant (p < 0.001) fixation indices (FST, FIS and FIT). A low gene flow over all loci (Nm 1.548) indicates little genetic variation transfer between populations. The genetic structures of all the populations were successfully resolved into four main clusters by an unweighted pair group method with arithmetic mean (UPGMA) dendrogram generated based on Nei’s genetic distances. The population structures based on principal coordinates analysis (PCoA) and the Bayesian model also suggested four distinct clusters following geographical regions and eight closely related populations. This study provided a useful baseline reference for better genetic management and utilization of the Tor spp. stocks in their breeding and conservation programmes.

The Power of Pigs

2020 ◽  
pp. 1-9
Author(s):  
Max D. Price
Keyword(s):  
Near East ◽  
Cultural Elements ◽  
Cultural Contexts ◽  
Near Eastern ◽  
Eastern Cultures ◽  
History Of ◽  
Environmental Process ◽  
Previous Scholarship

This introductory chapter outlines the themes of the book. Pigs have long played important roles in the cultures of the Near East, especially in times of ethnoreligious conflict. The mass cull in 2009 of swine owned by the Zabaleen in Cairo is one of the most recent examples. Examining pigs provides a lens into the past, a unique means of studying Near Eastern cultures. Whereas previous scholarship has been content to study the pig in specific cultural contexts, often attempting to explain its history with reference to a single cultural or environmental process, this book covers the history of the pig from before its domestication to the present day. By adopting this long-term, wide-reaching perspective, I advance the argument that pigs, and the taboos placed upon them, can be understood only as evolving cultural elements.

Genetic diversity and biogeography of the boab Adansonia gregorii (Malvaceae: Bombacoideae)

2014 ◽  
Vol 62 (2) ◽  
pp. 164 ◽  
Author(s):  
Karen L. Bell ◽  
Haripriya Rangan ◽  
Rachael Fowler ◽  
Christian A. Kull ◽  
J. D. Pettigrew ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Population Bottleneck ◽  
Geographic Structure ◽  
Significant Gene ◽  
Spatial Principal Components ◽  
High Gene ◽  
Components Analysis ◽  
The Last Glacial Maximum ◽  
The Last Glacial

The Kimberley region of Western Australia is recognised for its high biodiversity and many endemic species, including the charismatic boab tree, Adansonia gregorii F.Muell. (Malvaceae: Bombacoideae). In order to assess the effects of biogeographic barriers on A. gregorii, we examined the genetic diversity and population structure of the tree species across its range in the Kimberley and adjacent areas to the east. Genetic variation at six microsatellite loci in 220 individuals from the entire species range was examined. Five weakly divergent populations, separated by west–east and coast–inland divides, were distinguished using spatial principal components analysis. However, the predominant pattern was low geographic structure and high gene flow. Coalescent analysis detected a population bottleneck and significant gene flow across these inferred biogeographic divides. Climate cycles and coastline changes following the last glacial maximum are implicated in decreases in ancient A. gregorii population size. Of all the potential gene flow vectors, various macropod species and humans are the most likely.

Abundant genetic diversity and maternal origins of modern horses

2019 ◽  
Vol 99 (4) ◽  
pp. 929-934
Author(s):  
Hongzhao Lu ◽  
Hao Bai ◽  
Ling Wang ◽  
Tao Zhang
Keyword(s):  
Genetic Diversity ◽  
Mitochondrial Dna ◽  
Gene Flow ◽  
Domestic Horse ◽  
European Regions ◽  
Geographical Regions ◽  
D Loop ◽  
Ancient Times

To clarify the origin and genetic diversity of modern horses, mitochondrial DNA (mtDNA) D-loop sequences were generated for 3965 horses from 12 geographical regions. From these sequences, we observed 439 haplotypes defined by 138 polymorphic nucleotide sites. All horses were genetically diverse (HD = 0.973 ± 0.001, π = 0.0243 ± 0.0005), which showed that maternal lineages of the domestic horse are worldwide highly diverse. In general, all 18 haplogroups were presented in the Asian horse. The majority of modern horse sequences belong to haplogroups L, Q, and A. At the same time, 194 archaeological samples from four geographical regions were obtained. Indeed, haplogroup distributions are overlapping in modern and ancient samples, indicating that most haplogroups were already present in ancient times at least in Europe and Asia. The network showed that breeds of Asian and Europe regions overlapped, suggesting that extensive gene flow had occurred between different horse breeds in Asian and European regions.

scholarly journals Extensive Female-Mediated Gene Flow from Sub-Saharan Africa into Near Eastern Arab Populations

2003 ◽  
Vol 72 (4) ◽  
pp. 1058-1064 ◽  
Author(s):  
Martin Richards ◽  
Chiara Rengo ◽  
Fulvio Cruciani ◽  
Fiona Gratrix ◽  
James F. Wilson ◽  
...  
Keyword(s):  
Gene Flow ◽  
Sub Saharan Africa ◽  
Near Eastern ◽  
Sub Saharan

Late Mesolithic Armature Variability in the Southern North Sea Basin: Implications for Forager-LinearbandkeramikContact Models of the Transition to Agriculture in Belgium and the Southern Netherlands

2013 ◽  
Vol 16 (1) ◽  
pp. 3-20 ◽  
Author(s):  
Erick Robinson ◽  
Joris Sergant ◽  
Philippe Crombé
Keyword(s):  
North Sea ◽  
Cultural Transmission ◽  
Regional Scale ◽  
Regional Variability ◽  
Hunter Gatherers ◽  
Southern North Sea ◽  
Southern Netherlands ◽  
Contact Models ◽  
Transition To Agriculture ◽  
Early Farmers

Lithic armatures have been widely noted as key evidence for interpreting the role of indigenous Mesolithic traditions in the spread of the Early Neolithic Linearbandkeramik (LBK) culture, and therefore early agriculture, across temperate Europe. Their role as evidence for the continuity of Mesolithic ‘identities’ has been emphasized without the use of a unified, systematic recording methodology of armatures from both Late–Final Mesolithic (LM–FM) and LBK sites that places armatures in their broader context as part of projectile technologies of late hunter-gatherers and early farmers. In this paper, we present the results of recent research in the southern North Sea basin that utilized a systematic and unified recording methodology to analyse armature assemblages from LM–FM and LBK sites on an inter-regional scale. We report that there is much more inter-regional variability in armature assemblages during the LM than traditionally considered in efforts to interpret similarities and possible cultural transmission processes between Mesolithic and LBK populations. This paper calls for a reassessment of inter-regional LM variability in the construction of Mesolithic-LBK contact models and a focus that places armatures in their broader social and technological contexts.

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