scholarly journals Influence of northern limit range on genetic diversity and structure in a widespread North American tree, sugar maple (Acer saccharumMarshall)

2018 ◽  
Vol 8 (5) ◽  
pp. 2766-2780 ◽  
Author(s):  
Noémie Graignic ◽  
Francine Tremblay ◽  
Yves Bergeron
Keyword(s):  
Genetic Diversity ◽  
North American ◽  
Sugar Maple ◽  
Northern Limit ◽  
Genetic Diversity And Structure

scholarly journals Do founder size, genetic diversity and structure influence rates of expansion of North American grey squirrels in Europe?

2014 ◽  
Vol 20 (8) ◽  
pp. 918-930 ◽  
Author(s):  
A. L. Signorile ◽  
J. Wang ◽  
P. W. W. Lurz ◽  
S. Bertolino ◽  
C. Carbone ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
North American ◽  
Genetic Diversity And Structure ◽  
Grey Squirrels

Genetic structure after forest fragmentation: a landscape ecology perspective on Acer saccharum

1992 ◽  
Vol 70 (8) ◽  
pp. 1659-1668 ◽  
Author(s):  
Stephanie A. Foré ◽  
R. James Hickey ◽  
John L. Vankat ◽  
Sheldon I. Guttman ◽  
Robert L. Schaefer
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Forest Fragmentation ◽  
Acer Saccharum ◽  
Sugar Maple ◽  
Fragmented Landscape ◽  
Starch Gel Electrophoresis ◽  
Long Distance ◽  
Local Populations ◽  
Genetic Diversity And Structure

Fragmentation of large expanses of forests into small stands has isolated local populations of organisms. Sugar maple (Acer saccharum) was used to determine if the degree of forest fragment isolation affects genetic diversity and structure of local populations. Genetic data were collected from canopy (prefragmentation) and juvenile (postfragmentation) individuals in 15 woodlots. Genotypes were inferred from phenotypic enzyme patterns of seven enzymes representing eight loci extracted from cambium and resolved with starch gel electrophoresis. Analyses of allelic data indicated that genetic diversity was not significantly different between juvenile or canopy subdivisions, or between woodlots with low and high degrees of isolation. Genetic differentiation among woodlots was significantly greater for the canopy than for the juvenile subdivision. Estimates of gene flow indicate that postfragmentation gene flow rates are higher than prefragmentation rates. Apparently, sugar maple's high potential for long-distance gene flow is enhanced by altered wind flux across a fragmented landscape. The results also show that forest fragmentation does not always result in greater isolation of local populations. Key words: sugar maple, gene flow, conservation, isolation, allozymes.

scholarly journals Rhipicephalus sanguineus Complex in the Americas: Systematic, Genetic Diversity, and Geographic Insights

Pathogens ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1118
Author(s):  
Sokani Sánchez-Montes ◽  
Beatriz Salceda-Sánchez ◽  
Sergio E. Bermúdez ◽  
Gabriela Aguilar-Tipacamú ◽  
Gerardo G. Ballados-González ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Rhipicephalus Sanguineus ◽  
Northern Limit ◽  
High Genetic Diversity ◽  
Mitochondrial Markers ◽  
Genetic Diversity And Structure ◽  
Morphological Variants ◽  
Wide Geographic Distribution ◽  
Rhipicephalus Sanguineus Group ◽  
Vectorial Competence

The Rhipicephalus sanguineus group encompasses at least 12 validated species of Palearctic and Afrotropical hard ticks, which are relevant in veterinary medicine and public health. The taxonomy of R. sanguineus s.s., has been particularly intensely debated, due to its wide geographic distribution, morphological variants, parasite-host associations, and its capacity and vectorial competence for the transmission of several pathogens. By sequencing mitochondrial markers, it was possible to identify the existence of multiple lineages, among which the Tropical and the Temperate lineages stand out, particularly in America. However, the northern limit between these lineages is not clear due to the lack of extensive sampling across Mexico. For this reason, the aim of the present study was to determine the genetic diversity and structure of the R. sanguineus group in Mexico and to compare it with the populations reported in the Americas, in order to propose the northern limit of the R. sanguineus Tropical lineage and the potential regions of sympatry with R. sanguineus s.s. The findings of this study now confirm the presence of R. sanguineus s.s. in Mexico, showing a subtle genetic structure and high genetic diversity throughout its distribution in the Americas. In contrast, the Tropical lineage seems to be genetically less diverse in its overall distribution in the Americas. The genetic diversity of these two independent lineages could have important epidemiological implications in the transmission of tick pathogens.

scholarly journals Genetic Diversity and Population Structure Analysis of Chinese Wild Grape Using Simple Sequence Repeat Markers

2021 ◽  
pp. 1-11
Author(s):  
Beibei Li ◽  
Xiucai Fan ◽  
Ying Zhang ◽  
Chonghuai Liu ◽  
Jianfu Jiang
Keyword(s):  
Genetic Diversity ◽  
Cluster Analysis ◽  
Ssr Markers ◽  
Structure Analysis ◽  
North American ◽  
Simple Sequence Repeat ◽  
North American Species ◽  
Sequence Repeat ◽  
Genetic Diversity And Structure ◽  
Simple Sequence

Chinese wild Vitis is a useful gene source for resistance to biotic and abiotic stresses, although there is little research on its genetic diversity and structure. In this study, nine simple sequence repeat (SSR) markers were used to assess the genetic diversity and genetic structure among 100 Vitis materials. These materials included 77 indigenous accessions representing 23 of 38 wild Vitis species/cultivars in China, 18 V. vinifera cultivars, and the five North American species V. aestivalis, V. girdiana, V. monticola, V. acerifolia, and V. riparia. The SSR loci used in this study for establishing an international database (Vitis International Variety Catalogue) revealed a total of 186 alleles in 100 Vitis accessions. The mean values for the gene diversity (GD) and polymorphism information content (PIC) per locus were 0.91 and 0.90, respectively, which indicates that the discriminatory power of the markers is high. Based on the genetic distance data, the 100 Vitis accessions were divided into five primary clusters by cluster analysis, and five populations by structure analysis; these results indicate these Chinese wild grapes were more genetically close to European grapes than to North American species. In addition, the clustering patterns of most accessions correlated with the geographic distribution. An analysis of molecular variance (AMOVA) revealed that 3.28%, 3.27%, and 93.46% of the variance occurred between populations, between individuals within populations, and between individuals within the entire population, respectively. In addition, we identified three previously undescribed accessions (Wuzhi-1, MZL-5, and MZL-6) by cluster analysis. Our results reveal a high level of genetic diversity and variability in Vitis from China, which will be helpful in the use of genetic resources in future breeding programs. In addition, our study demonstrates that SSR markers are highly suitable for further genetic diversity analyses of Chinese wild grapes.

Clonality and genetic diversity in the eastern North American spring ephemeral Erythronium americanum Ker-Gawl. (American Trout Lily)1,2

2019 ◽  
Vol 146 (3) ◽  
pp. 143 ◽  
Author(s):  
Richard L. Stokes ◽  
Megan Philpott ◽  
Theresa M. Culley
Keyword(s):  
Genetic Diversity ◽  
North American ◽  
Spring Ephemeral ◽  
Erythronium Americanum

Variation in Genetic Diversity across the Range of North American Brown Bears

1998 ◽  
Vol 12 (2) ◽  
pp. 418-429 ◽  
Author(s):  
David Paetkau ◽  
Lisette P. Waits ◽  
Peter L. Clarkson ◽  
Lance Craighead ◽  
Ernie Vyse ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
North American ◽  
Brown Bears

scholarly journals Genetic diversity and population structure of Plasmodium falciparum in Nigeria: insights from microsatellite loci analysis

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Fehintola V. Ajogbasile ◽  
Adeyemi T. Kayode ◽  
Paul E. Oluniyi ◽  
Kazeem O. Akano ◽  
Jessica N. Uwanibe ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Plasmodium Falciparum ◽  
Population Structure ◽  
Microsatellite Loci ◽  
Control Strategies ◽  
Population Diversity ◽  
Parasite Population ◽  
Nested Polymerase Chain Reaction ◽  
Public Health Burden ◽  
Genetic Diversity And Structure

Abstract Background Malaria remains a public health burden especially in Nigeria. To develop new malaria control and elimination strategies or refine existing ones, understanding parasite population diversity and transmission patterns is crucial. Methods In this study, characterization of the parasite diversity and structure of Plasmodium falciparum isolates from 633 dried blood spot samples in Nigeria was carried out using 12 microsatellite loci of P. falciparum. These microsatellite loci were amplified via semi-nested polymerase chain reaction (PCR) and fragments were analysed using population genetic tools. Results Estimates of parasite genetic diversity, such as mean number of different alleles (13.52), effective alleles (7.13), allelic richness (11.15) and expected heterozygosity (0.804), were high. Overall linkage disequilibrium was weak (0.006, P < 0.001). Parasite population structure was low (Fst: 0.008–0.105, AMOVA: 0.039). Conclusion The high level of parasite genetic diversity and low population structuring in this study suggests that parasite populations circulating in Nigeria are homogenous. However, higher resolution methods, such as the 24 SNP barcode and whole genome sequencing, may capture more specific parasite genetic signatures circulating in the country. The results obtained can be used as a baseline for parasite genetic diversity and structure, aiding in the formulation of appropriate therapeutic and control strategies in Nigeria.

scholarly journals Genetic diversity and structure of the endemic and endangered species Aristolochia delavayi growing along the Jinsha River

2021 ◽  
Author(s):  
Yu-Long Yu ◽  
Hui-Chun Wang ◽  
Zhi-Xiang Yu ◽  
Johann Schinnerl ◽  
Rong Tang ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Endangered Species ◽  
Jinsha River ◽  
Genetic Diversity And Structure

scholarly journals Genetic diversity of North American captive-born gorillas (Gorilla gorilla gorilla)

2013 ◽  
Vol 3 (1) ◽  
pp. 80-88 ◽  
Author(s):  
Noah D. Simons ◽  
Ronald S. Wagner ◽  
Joseph G. Lorenz
Keyword(s):  
Genetic Diversity ◽  
North American ◽  
Gorilla Gorilla ◽  
Gorilla Gorilla Gorilla
Sign in / Sign up

Export Citation Format

Share Document