scholarly journals Genetic variation and population dispersal of Yangtze voles Microtus fortis calamorum in the Dongting Lake region

2012 ◽  
Vol 58 (2) ◽  
pp. 211-220 ◽  
Author(s):  
Zongming Guo ◽  
Pengfei Song ◽  
Cong GUO ◽  
Zhaobin Song ◽  
Yong Wang ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Isolation By Distance ◽  
Geographic Distance ◽  
Haplotype Diversity ◽  
Population Expansion ◽  
Dongting Lake ◽  
Distance Analysis ◽  
Population Dispersal ◽  
Lake Region ◽  
Nonparametric Correlation

Abstract To understand genetic variation and population dispersal in the Yangtze vole Microtus fortis calamorum distributed in the Dongting Lake region, 144 individuals were collected from six habitat patches. The mitochondrial DNA control region was sequenced and 17 haplotypes were observed. Of the six investigated populations, haplotype and nucleotide diversities of those from larger patches were higher than those from smaller patches. Nonparametric correlation analysis showed that patch size had a positive correlation with haplotype diversity (r = 0.943, P < 0.01). A neighbour-joining tree of the 17 haplotypes showed no geographic genetic structure among the six populations. Analysis of isolation by distance showed that genetic differentiation among the six populations was not positively related to geographic distance. Analysis of mismatch distribution indicated that the voles had passed through a population expansion. The pattern of haplotype distribution in the Changsha population suggests that the population was established by a founder effect [Current Zoology 58 (2): 211–220, 2012].

scholarly journals Population Genetics of the Black Citrus Aphid Aphis aurantii (Hemiptera, Aphididae) in China

2021 ◽  
Vol 9 ◽  
Author(s):  
Hong-Ling Liu ◽  
Zhi-Teng Chen ◽  
Chao Liu ◽  
Xing-Long Wu ◽  
Ke-Jun Xiao ◽  
...  
Keyword(s):  
Isolation By Distance ◽  
Genetic Difference ◽  
Geographic Distance ◽  
Flow Analysis ◽  
Haplotype Diversity ◽  
Population Expansion ◽  
Population Diversity ◽  
Recent Population Expansion ◽  
High Positive Correlation ◽  
Local Populations

The black citrus aphid, Aphis aurantiiBoyer de Fonscolombe, 1841, is one of the most destructive pests in commercial tea plantations and gardens in China. In this study, we investigated the population genetic structure of A. aurantii based on the concatenated sequences of two mitochondrial genes, cytochrome c oxidase I (cox1) and cytochrome b (cytb). A total of 166 haplotypes were identified from 177 individuals collected at 11 locations in China. The whole Chinese A. aurantii population showed a low nucleotide diversity (0.00968) and a high population diversity (haplotype diversity; 0.9991). The haplotypes of the 11 local populations were widely distributed in the neighbor-joining phylogenetic tree and haplotype network diagram, whereas no apparent lineages were detected. Gene flow analysis showed gene exchanges among local populations. The pairwise Fst values revealed a certain amount of genetic difference among local populations. Analysis of molecular variance (AMOVA) reflected genetic differences both within and among populations. The isolation by distance (IBD) analysis revealed a high positive correlation between the geographic distance and genetic distance of the different populations. Neutral test and mismatch distribution suggested that A. aurantii may have experienced recent population expansion events.

scholarly journals Genetic Variation and Population Genetics ofTaenia saginatain North and Northeast Thailand in relation toTaenia asiatica

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Malinee Anantaphruti ◽  
Urusa Thaenkham ◽  
Teera Kusolsuk ◽  
Wanna Maipanich ◽  
Surapol Saguankiat ◽  
...  
Keyword(s):  
Population Genetics ◽  
Genetic Variation ◽  
Endangered Species ◽  
Selective Sweep ◽  
Haplotype Diversity ◽  
Population Expansion ◽  
World Population ◽  
Taenia Saginata ◽  
Northeast Thailand ◽  
Haplotype A

Taenia saginatais the most common humanTaeniain Thailand. Bycox1sequences, 73 isolates from four localities in north and northeast were differentiated into 14 haplotypes, 11 variation sites and haplotype diversity of 0.683. Among 14 haplotypes, haplotype A was the major (52.1%), followed by haplotype B (21.9%). Clustering diagram of Thai and GenBank sequences indicated mixed phylogeny among localities. By MJ analysis, haplotype clustering relationships showed paired-stars-like network, having two main cores surrounded by minor haplotypes. Tajima’sDvalues were significantly negative inT. saginataworld population, suggesting population expansion. Significant Fu’sFsvalues in Thai, as well as world population, also indicate that population is expanding and may be hitchhiking as part of selective sweep. Haplotype B and its dispersion were only found in populations from Thailand. Haplotype B may evolve and ultimately become an ancestor of future populations in Thailand. Haplotype A seems to be dispersion haplotype, not just in Thailand, but worldwide. High geneticT. saginataintraspecies divergence was found, in contrast to its sister species,T. asiatica; among 30 samples from seven countries, its haplotype diversity was 0.067, while only 2 haplotypes were revealed. This extremely low intraspecific variation suggests thatT. asiaticacould be an endangered species.

scholarly journals Temporal genetic variation and dispersal patterns of Aedes albopictus (Diptera: Culicidae) among three different temperature regions of China

2020 ◽  
Author(s):  
Jian Gao ◽  
Hengduan Zhang ◽  
Xiaoxia Guo ◽  
Dan Xing ◽  
YanDe Dong ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Environmental Factors ◽  
Aedes Albopictus ◽  
Isolation By Distance ◽  
Population Expansion ◽  
Coi Gene ◽  
Tropical Region ◽  
Dispersal Patterns ◽  
Temperate Region ◽  
The Mean

Abstract Background Aedes albopictus is an indigenous and primary vector for Dengue and Zika viruses in China. Compare with its insecticide resistance, biology, and vector competence; little was known about its genetic variation, corresponding to environmental variations. Thus, the present study aims to discuss how Ae. albopictus population varies among different temperatures regions of China and decipher its potential dispersal patterns.Methods The genetic variation and population structure of all 17 Ae. albopictus populations, collected from three temperature regions of China, were investigated with 11 microsatellite loci and mitochondrial COI gene.Results 11 pairs out of 44 isolated microsatellite markers were chosen for genotyping analysis with the average PIC value of 0.713, which was high polymorphism. The number of alleles was high for each population, with the ne value increased from the Temperate region (3.876) to the Tropical region (4.144). 25 COI Haplotypes were detected, and the highest diversity was observed among the Tropical region. The mean Ho value (ca. 0.557) of all temperature regions, was significantly lower than the mean He values (ca. 0.684), with nearly all populations significantly departed from the HWE test and displayed significant population expansion ( p-value < 0.05).Two genetically isolated groups and three Haplotype clades were evaluated via STRUCTURE and Haplotype phylogenetic analyses, with Tropical populations isolated from other regions, significantly. Meanwhile, the majority genetic variation of Ae. albopictus populations were detected within populations and individuals at 31.40% and 63.04%, respectively, via AMOVA test, and a relatively significant positive correlation was merely observed among populations from the temperate region via Isolation by distance (IBD) analysis (R2 = 0.6614, p = 0.048). Recent dispersions were observed among different Ae. albopictus populations and a total of four major migration trends were rebuilt between the Tropical and the other two regions with the high genetic flows (Nm>0.5). Environmental factors, especially temperature and rainfall, may be the leading cause of genetic diversity differences of different temperature regions. Conclusions Continuous dispersion contributes to the similarity of Ae. albopictus populations among different temperature regions, and environmental factors, especially temperature and rainfall, may be the leading cause of genetic variation.

Characteristics of Species Diversity of Herb Community in the Polder of Returning Farmland to Lake in the Dongting Lake Region

2013 ◽  
Vol 19 (3) ◽  
pp. 434-443 ◽  
Author(s):  
Meiwen ZHANG ◽  
Bo LI ◽  
Yong WANG ◽  
Daosong JIANG ◽  
Huang HUANG ◽  
...  
Keyword(s):  
Species Diversity ◽  
Dongting Lake ◽  
Lake Region

BEHAVIORS ASSOCIATED WITH WATER CONTACT AND SCHISTOSOMA JAPONICUM INFECTION IN A RURAL VILLAGE, THE DONGTING LAKE REGION, CHINA

2006 ◽  
Vol 34 (3) ◽  
pp. 117-123
Author(s):  
Shouhei Takeuchi ◽  
Yuesheng Li ◽  
Yongkang He ◽  
Huan Zhou ◽  
Moji Kazuhiko ◽  
...  
Keyword(s):  
Schistosoma Japonicum ◽  
Dongting Lake ◽  
Water Contact ◽  
Rural Village ◽  
Lake Region

scholarly journals Population genetics of Aedes albopictus (Diptera: Culicidae) in its native range in Lao People’s Democratic Republic

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Maysa Tiemi Motoki ◽  
Dina Madera Fonseca ◽  
Elliott Frederic Miot ◽  
Bruna Demari-Silva ◽  
Phoutmany Thammavong ◽  
...  
Keyword(s):  
Population Structure ◽  
Gene Flow ◽  
Aedes Albopictus ◽  
Isolation By Distance ◽  
Genetic Locus ◽  
Lao Pdr ◽  
Phylogenetic Network ◽  
Population Expansion ◽  
Recent Population Expansion ◽  
The Usa

Abstract Background The Asian tiger mosquito, Aedes (Stegomyia) albopictus (Skuse) is an important worldwide invasive species and can be a locally important vector of chikungunya, dengue and, potentially, Zika. This species is native to Southeast Asia where populations thrive in both temperate and tropical climates. A better understanding of the population structure of Ae. albopictus in Lao PDR is very important in order to support the implementation of strategies for diseases prevention and vector control. In the present study, we investigated the genetic variability of Ae. albopictus across a north-south transect in Lao PDR. Methods We used variability in a 1337-bp fragment of the mitochondrial cytochrome c oxidase subunit 1 gene (cox1), to assess the population structure of Ae. albopictus in Lao PDR. For context, we also examined variability at the same genetic locus in samples of Ae. albopictus from Thailand, China, Taiwan, Japan, Singapore, Italy and the USA. Results We observed very high levels of genetic polymorphism with 46 novel haplotypes in Ae. albopictus from 9 localities in Lao PDR and Thailand populations. Significant differences were observed between the Luangnamtha population and other locations in Lao PDR. However, we found no evidence of isolation by distance. There was overall little genetic structure indicating ongoing and frequent gene flow among populations or a recent population expansion. Indeed, the neutrality test supported population expansion in Laotian Ae. albopictus and mismatch distribution analyses showed a lack of low frequency alleles, a pattern often seen in bottlenecked populations. When samples from Lao PDR were analyzed together with samples from Thailand, China, Taiwan, Japan, Singapore, Italy and the USA, phylogenetic network and Bayesian cluster analysis showed that most populations from tropical/subtropical regions are more genetically related to each other, than populations from temperate regions. Similarly, most populations from temperate regions are more genetically related to each other, than those from tropical/subtropical regions. Conclusions Aedes albopictus in Lao PDR are genetically related to populations from tropical/subtropical regions (i.e. Thailand, Singapore, and California and Texas in the USA). The extensive gene flow among locations in Lao PDR indicates that local control is undermined by repeated introductions from untreated sites.

Population Genetics ofCaenorhabditis elegans: The Paradox of Low Polymorphism in a Widespread Species

Genetics ◽  
2003 ◽  
Vol 163 (1) ◽  
pp. 147-157 ◽  
Author(s):  
Arjun Sivasundar ◽  
Jody Hey
Keyword(s):  
Genetic Variation ◽  
Microsatellite Loci ◽  
Population Expansion ◽  
Widespread Species ◽  
C Elegans ◽  
Model Research ◽  
The World ◽  
Natural Isolates ◽  
History Of ◽  
Low Levels

AbstractCaenorhabditis elegans has become one of the most widely used model research organisms, yet we have little information on evolutionary processes and recent evolutionary history of this widespread species. We examined patterns of variation at 20 microsatellite loci in a sample of 23 natural isolates of C. elegans from various parts of the world. One-half of the loci were monomorphic among all strains, and overall genetic variation at microsatellite loci was low, relative to most other species. Some population structure was detected, but there was no association between the genetic and geographic distances among different natural isolates. Thus, despite the nearly worldwide occurrence of C. elegans, little evidence was found for local adaptation in strains derived from different parts of the world. The low levels of genetic variation within and among populations suggest that recent colonization and population expansion might have occurred. However, the patterns of variation are not consistent with population expansion. A possible explanation for the observed patterns is the action of background selection to reduce polymorphism, coupled with ongoing gene flow among populations worldwide.

scholarly journals Phylogeography of Prunus armeniaca L. revealed by chloroplast DNA and nuclear ribosomal sequences

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wen-Wen Li ◽  
Li-Qiang Liu ◽  
Qiu-Ping Zhang ◽  
Wei-Quan Zhou ◽  
Guo-Quan Fan ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Variation ◽  
Chloroplast Dna ◽  
Population Expansion ◽  
Prunus Armeniaca ◽  
River Valley ◽  
Nuclear Ribosomal Dna ◽  
Glacial Refugium ◽  
Ili River Valley ◽  
Wild Apricot

AbstractTo clarify the phytogeography of Prunus armeniaca L., two chloroplast DNA fragments (trnL-trnF and ycf1) and the nuclear ribosomal DNA internal transcribed spacer (ITS) were employed to assess genetic variation across 12 P. armeniaca populations. The results of cpDNA and ITS sequence data analysis showed a high the level of genetic diversity (cpDNA: HT = 0.499; ITS: HT = 0.876) and a low level of genetic differentiation (cpDNA: FST = 0.1628; ITS: FST = 0.0297) in P. armeniaca. Analysis of molecular variance (AMOVA) revealed that most of the genetic variation in P. armeniaca occurred among individuals within populations. The value of interpopulation differentiation (NST) was significantly higher than the number of substitution types (GST), indicating genealogical structure in P. armeniaca. P. armeniaca shared genotypes with related species and may be associated with them through continuous and extensive gene flow. The haplotypes/genotypes of cultivated apricot populations in Xinjiang, North China, and foreign apricot populations were mixed with large numbers of haplotypes/genotypes of wild apricot populations from the Ili River Valley. The wild apricot populations in the Ili River Valley contained the ancestral haplotypes/genotypes with the highest genetic diversity and were located in an area considered a potential glacial refugium for P. armeniaca. Since population expansion occurred 16.53 kyr ago, the area has provided a suitable climate for the population and protected the genetic diversity of P. armeniaca.

Genetic Relationships of Cory's Shearwater: Parentage, Mating Assortment, and Geographic Differentiation Revealed by DNA Fingerprinting

The Auk ◽  
2000 ◽  
Vol 117 (3) ◽  
pp. 651-662 ◽  
Author(s):  
Corinne Rabouam ◽  
Vincent Bretagnolle ◽  
Yves Bigot ◽  
Georges Periquet
Keyword(s):  
Genetic Variation ◽  
Genetic Structure ◽  
Dna Fingerprinting ◽  
Genetic Relatedness ◽  
Isolation By Distance ◽  
Genetic Relationships ◽  
Cory’S Shearwater ◽  
Genetic Structure Of Populations ◽  
The Social ◽  
Calonectris Diomedea

Abstract We used DNA fingerprinting to assess genetic structure of populations in Cory's Shearwater (Calonectris diomedea). We analyzed mates and parent-offspring relationships, as well as the amount and distribution of genetic variation within and among populations, from the level of subcolony to subspecies. We found no evidence of extrapair fertilization, confirming that the genetic breeding system matches the social system that has been observed in the species. Mates were closely related, and the level of genetic relatedness within populations was within the range usually found in inbred populations. In contrast to previous studies based on allozymes and mtDNA polymorphism, DNA fingerprinting using microsatellites revealed consistent levels of genetic differentiation among populations. However, analyzing the two subspecies separately revealed that the pattern of genetic variation among populations did not support the model of isolation by distance. Natal dispersal, as well as historic and/or demographic events, probably contributed to shape the genetic structure of populations in the species.

Significant genetic differences among Heterodera schachtii populations within and among sugar beet production areas

Nematology ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 165-177 ◽  
Author(s):  
Rasha Haj Nuaima ◽  
Johannes Roeb ◽  
Johannes Hallmann ◽  
Matthias Daub ◽  
Holger Heuer
Keyword(s):  
Genetic Variation ◽  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Spatial Scales ◽  
Geographic Distance ◽  
Heterodera Schachtii ◽  
Parasitic Nematodes ◽  
Neutral Genetic Variation ◽  
Production Areas

Summary Characterising the non-neutral genetic variation within and among populations of plant-parasitic nematodes is essential to determine factors shaping the population genetic structure. This study describes the genetic variation of the parasitism gene vap1 within and among geographic populations of the beet cyst nematode Heterodera schachtii. Forty populations of H. schachtii were sampled at four spatial scales: 695 km, 49 km, 3.1 km and 0.24 km. DGGE fingerprinting showed significant differences in vap1 patterns among populations. High similarity of vap1 patterns appeared between geographically close populations, and occasionally among distant populations. Analysis of spatially sampled populations within fields revealed an effect of tillage direction on the vap1 similarity for two of four studied fields. Overall, geographic distance and similarity of vap1 patterns of H. schachtii populations were negatively correlated. In conclusion, the population genetic structure was shaped by the interplay between the genetic adaptation and the passive transport of this nematode.

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