Gene flow contributes to genetic diversity of tetraploid populations of the North American plant genusHoustonia(Rubiaceae)

Rhodora ◽  
10.3119/14-10 ◽  
2015 ◽  
Vol 117 (969) ◽  
pp. 41-66 ◽  
Author(s):  
Kelsey L. Glennon ◽  
Sheri A. Church
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
North American ◽  
The North

scholarly journals Genetic studies of human diversity in East Asia

2007 ◽  
Vol 362 (1482) ◽  
pp. 987-996 ◽  
Author(s):  
Feng Zhang ◽  
Bing Su ◽  
Ya-ping Zhang ◽  
Li Jin
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
East Asia ◽  
Pacific Islands ◽  
East Asian ◽  
Human Populations ◽  
Genetic Studies ◽  
The North ◽  
Asian Populations ◽  
Genetic Diversity And Structure

East Asia is one of the most important regions for studying evolution and genetic diversity of human populations. Recognizing the relevance of characterizing the genetic diversity and structure of East Asian populations for understanding their genetic history and designing and interpreting genetic studies of human diseases, in recent years researchers in China have made substantial efforts to collect samples and generate data especially for markers on Y chromosomes and mtDNA. The hallmark of these efforts is the discovery and confirmation of consistent distinction between northern and southern East Asian populations at genetic markers across the genome. With the confirmation of an African origin for East Asian populations and the observation of a dominating impact of the gene flow entering East Asia from the south in early human settlement, interpretation of the north–south division in this context poses the challenge to the field. Other areas of interest that have been studied include the gene flow between East Asia and its neighbouring regions (i.e. Central Asia, the Sub-continent, America and the Pacific Islands), the origin of Sino-Tibetan populations and expansion of the Chinese.

scholarly journals Phylogenetics of a Fungal Invasion: Origins and Widespread Dispersal of White-Nose Syndrome

mBio ◽  
2017 ◽  
Vol 8 (6) ◽  
Author(s):  
Kevin P. Drees ◽  
Jeffrey M. Lorch ◽  
Sebastien J. Puechmaille ◽  
Katy L. Parise ◽  
Gudrun Wibbelt ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
North America ◽  
North American ◽  
Fungal Pathogen ◽  
Phylogenetic Study ◽  
Pseudogymnoascus Destructans ◽  
Long Distance ◽  
Recent Introduction ◽  
White Nose Syndrome ◽  
The North

ABSTRACT Globalization has facilitated the worldwide movement and introduction of pathogens, but epizoological reconstructions of these invasions are often hindered by limited sampling and insufficient genetic resolution among isolates. Pseudogymnoascus destructans , a fungal pathogen causing the epizootic of white-nose syndrome in North American bats, has exhibited few genetic polymorphisms in previous studies, presenting challenges for both epizoological tracking of the spread of this fungus and for determining its evolutionary history. We used single nucleotide polymorphisms (SNPs) from whole-genome sequencing and microsatellites to construct high-resolution phylogenies of P. destructans . Shallow genetic diversity and the lack of geographic structuring among North American isolates support a recent introduction followed by expansion via clonal reproduction across the epizootic zone. Moreover, the genetic relationships of isolates within North America suggest widespread mixing and long-distance movement of the fungus. Genetic diversity among isolates of P. destructans from Europe was substantially higher than in those from North America. However, genetic distance between the North American isolates and any given European isolate was similar to the distance between the individual European isolates. In contrast, the isolates we examined from Asia were highly divergent from both European and North American isolates. Although the definitive source for introduction of the North American population has not been conclusively identified, our data support the origin of the North American invasion by P. destructans from Europe rather than Asia. IMPORTANCE This phylogenetic study of the bat white-nose syndrome agent, P. destructans , uses genomics to elucidate evolutionary relationships among populations of the fungal pathogen to understand the epizoology of this biological invasion. We analyze hypervariable and abundant genetic characters (microsatellites and genomic SNPs, respectively) to reveal previously uncharacterized diversity among populations of the pathogen from North America and Eurasia. We present new evidence supporting recent introduction of the fungus to North America from a diverse Eurasian population, with limited increase in genetic variation in North America since that introduction.

scholarly journals Climate change and conservation in a warm North American desert: effect in shrubby plants

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6572 ◽  
Author(s):  
Victoria Sosa ◽  
Israel Loera ◽  
Diego F. Angulo ◽  
Marilyn Vásquez-Cruz ◽  
Etelvina Gándara
Keyword(s):  
Climate Change ◽  
Genetic Diversity ◽  
Gene Flow ◽  
North American ◽  
Chihuahuan Desert ◽  
Haplotype Diversity ◽  
Sierra Madre Oriental ◽  
Ecological Resistance ◽  
Sierra Madre ◽  
Shrubby Species

Background Deserts are biologically rich habitats with a vast array of animals and plants adapted to xeric conditions, and most deserts are among the planet’s last remaining areas of total wilderness. Among North American deserts, the Chihuahuan Desert has the highest levels of diversity and endemism. To understand the effect of future climate change on plants distributed in this arid land and propose effective conservation planning, we focused on five endemic shrubby species that characterize the Chihuahuan Desert and used an integrative approach. Methods Ecological niche-based modeling, spatial genetics and ecological resistance analyses were carried out to identify the effect of global warming on the studied five shrubby species. Key areas that need to be preserved were identified taking into account the existing protected areas within the Chihuahuan Desert. Results The extent of future distribution will vary among these species, and on average expansion will occur in the western part of the Chihuahuan Desert. For most species low environmental resistance to gene flow was predicted, while higher future resistance was predicted for one species that would lead to increased population isolation. The highest haplotype diversity was identified in three hotspots. Based on future suitability of habitat and in the haplotype diversity we suggest preserving two hotspots of genetic diversity in the Sierra Madre Oriental, located in areas without protection. The third hotspot was detected in the well preserved Tehuacán-Cuicatlán Man and Biosphere Reserve. Conclusion Global climate change will have an effect in arid adapted plants, favoring expansion in the western of the Chihuahuan Desert however negatively affecting others with high ecological resistance disrupting gene flow. Two hotspots of genetic diversity in the Sierra Madre Oriental should be protected.

The North American Plums (Prunus Spp.): A Review of the Taxonomic and Phylogenetic Relationships

Prunus ◽  
2020 ◽  
Author(s):  
Dario J. Chavez ◽  
José X. Chaparro
Keyword(s):  
Genetic Diversity ◽  
North American ◽  
Fruit Size ◽  
Chilling Requirement ◽  
Prunus Species ◽  
The North ◽  
Phylogenetic Studies ◽  
Center Of Diversity ◽  
Heat Requirement ◽  
Prunus Spp

North America is a center of diversity for Prunus species. Tree architecture, chilling requirement, heat requirement, fruit development period, fruit size, fruit texture, disease resistance, and adaptive changes to multiple environmental conditions are a few examples of the traits of which tremendous genetic variability is available in the native plum species. Wild native Prunus species constitute an important potential source of genetic diversity for stone fruit breeding and selection. A review of the North American plum taxonomic treatment and phylogenetic studies is described. Various studies have been done with three major groups being identified: Americana series, Chickasaw series, and Beach series.

Assessing prehistoric genetic structure and diversity of North American elk (Cervus elaphus) populations in Alberta, Canada

2014 ◽  
Vol 92 (4) ◽  
pp. 285-298 ◽  
Author(s):  
C.F. Speller ◽  
B. Kooyman ◽  
A.T. Rodrigues ◽  
E.G. Langemann ◽  
R.M. Jobin ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
National Parks ◽  
Cervus Elaphus ◽  
North American ◽  
Rocky Mountain ◽  
Population Declines ◽  
Natural Ecosystems ◽  
North American Elk ◽  
Common Era

North American elk (Cervus elaphus L., 1758) are an important component of Canada’s natural ecosystems. Overhunting and habitat decline in the 19th century led to the near eradication of Rocky Mountain elk (Cervus elaphus nelsoni Bailey, 1935) and Manitoban elk (Cervus elaphus manitobensis Millais, 1915) within Alberta. Though elk populations have been restored within provincial and national parks, it is unknown to what degree historic population declines affected overall genetic diversity and population structuring of the two subspecies. This study targeted 551 bp of mitochondrial D-loop DNA from 50 elk remains recovered from 16 archaeological sites (2260 BCE (before common era) to 1920 CE (common era)) to examine the former genetic diversity and population structure of Alberta’s historic elk populations. Comparisons of ancient and modern haplotype and nucleotide diversity suggest that historic population declines reduced the mitochondrial diversity of Manitoban elk, while translocation of animals from Yellowstone National Park in the early 20th century served to maintain the diversity of Rocky Mountain populations. Gene flow between the two subspecies was significantly higher in the past than today, suggesting that the two subspecies previously formed a continuous population. These data on precontact genetic diversity and gene flow in Alberta elk provide essential baseline data integral for elk management and conservation in the province.

scholarly journals Genetic Diversity among Witchhazel Cultivars Based on Randomly Amplified Polymorphic DNA Markers

1997 ◽  
Vol 122 (4) ◽  
pp. 529-535 ◽  
Author(s):  
Robert D. Marquard ◽  
Eric P. Davis ◽  
Emily L. Stowe
Keyword(s):  
Genetic Diversity ◽  
Cluster Analysis ◽  
North American ◽  
Dna Markers ◽  
Rapd Markers ◽  
North American Species ◽  
The Other ◽  
Randomly Amplified Polymorphic Dna ◽  
The North ◽  
Sib Families

Forty selections, including 37 cultivars of Hamamelis spp., were evaluated for genetic similarities using randomly amplified polymorphic DNA (RAPD) markers. Cluster analysis identified seven groups, which included three groups of H. ×intermedia cultivars, two groups of H. vernalis, and one group each of H. mollis and H. japonica. Three H. ×intermedia cultivars, `Arnold Promise', `Westerstede', and `Carmine Red', did not group closely with the other 20 cultivars of H. ×intermedia. Selections of the North American species H. vernalis were quite distinct from the Asiatic selections. However, data are presented that suggest hybridization exist between Asiatic Hamamelis spp. and H. vernalis. Genetic similarities between known half-sib families provides evidence that the cultivar pairs `Arnold Promise'—`Winter Beauty' and `Carmine Red'—`Hiltingbury' are, themselves, not likely half-sibs.

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