Genetic variation and phylogeographic history of Picea likiangensis revealed by RAPD markers

Trees ◽  
2007 ◽  
Vol 21 (4) ◽  
pp. 457-464 ◽  
Author(s):  
Xiao-Li Peng ◽  
Chang-Ming Zhao ◽  
Gui-Li Wu ◽  
Jian-Quan Liu
Keyword(s):  
Genetic Variation ◽  
Rapd Markers ◽  
Phylogeographic History ◽  
History Of

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.

Phylogeographic history of Japanese macaques

2021 ◽  
Author(s):  
Tsuyoshi Ito ◽  
Takashi Hayakawa ◽  
Nami Suzuki–Hashido ◽  
Yuzuru Hamada ◽  
Yosuke Kurihara ◽  
...  
Keyword(s):  
Japanese Macaques ◽  
Phylogeographic History ◽  
History Of

scholarly journals The phylogeographic history of tomato mosaic virus in Eurasia

Virology ◽  
2021 ◽  
Vol 554 ◽  
pp. 42-47
Author(s):  
Yuting Xu ◽  
Shuling Zhang ◽  
Jianguo Shen ◽  
Zujian Wu ◽  
Zhenguo Du ◽  
...  
Keyword(s):  
Mosaic Virus ◽  
Tomato Mosaic Virus ◽  
Phylogeographic History ◽  
History Of

scholarly journals Detection and analysis of genetic variation in Salicornieae (Chenopodiaceae) using random amplified polymorphic DNA (RAPD) markers

Taxon ◽  
1995 ◽  
Vol 44 (1) ◽  
pp. 53-63 ◽  
Author(s):  
T. Luque ◽  
C. Ruiz ◽  
J. Avalos ◽  
I. L. Calderón ◽  
M. E. Figueroa
Keyword(s):  
Genetic Variation ◽  
Rapd Markers ◽  
Random Amplified Polymorphic Dna

Genetic variation in allozymes of western larch

1986 ◽  
Vol 16 (5) ◽  
pp. 1013-1018 ◽  
Author(s):  
Lauren Fins ◽  
Lisa W. Seeb
Keyword(s):  
Genetic Variation ◽  
Genetic Drift ◽  
Fire History ◽  
Glacial History ◽  
Geographic Proximity ◽  
Electrophoretic Variation ◽  
Inland Empire ◽  
Genetic History ◽  
Expected Heterozygosity ◽  
History Of

Seed samples from 19 stands of Larixoccidentalis Nutt. were analyzed for electrophoretic variation at 23 loci. Because sample sizes consisted of only 9 or 10 trees per stand (18–20 alleles per locus per stand), samples were grouped by geographic proximity into four larger samples. For all measures of variation, this species scored lower than most, but within the range observed for other western conifers. Most of the variation was found within rather than between the population groups. The single southern sample appeared to be genetically distinct from the others. Although some variation was observed between individual stand samples in expected heterozygosity, the consistently low values for all samples suggest that genetic drift has played a major role in the genetic history of the species in the Inland Empire, both through its glacial history in postulated refugia and through fire history in recent times.

Genetic Variation in Three Endangered Species of Encholirium (Bromeliaceae) from Cadeia do Espinhaço, Brazil, Setected using RAPD Markers

2006 ◽  
Vol 15 (14) ◽  
pp. 4357-4373 ◽  
Author(s):  
Marcelo Mattos Cavallari ◽  
Rafaela Campostrini Forzza ◽  
Elizabeth Ann Veasey ◽  
Maria Imaculada Zucchi ◽  
Giancarlo Conde Xavier Oliveira
Keyword(s):  
Genetic Variation ◽  
Endangered Species ◽  
Rapd Markers ◽  
Cadeia Do Espinhaço

scholarly journals Genetic variation in native and farmed populations of Tambaqui (Colossoma macropomum) in the Brazilian Amazon: regional discrepancies in farming systems

2013 ◽  
Vol 85 (4) ◽  
pp. 1439-1447 ◽  
Author(s):  
Jonas Aguiar ◽  
Horacio Schneider ◽  
Fatima Gomes ◽  
Jeferson Carneiro ◽  
Simoni Santos ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Variation ◽  
Dna Sequences ◽  
Amazon Basin ◽  
Farming Systems ◽  
Wild Populations ◽  
The West ◽  
Colossoma Macropomum ◽  
Breeding Stock ◽  
History Of

The tambaqui, Colossoma macropomum, is the most popular fish species used for aquaculture in Brazil but there is no study comparing genetic variation among native and farmed populations of this species. In the present study, we analyzed DNA sequences of the mitochondrial DNA to evaluate the genetic diversity among two wild populations, a fry-producing breeding stock, and a sample of fish farm stocks, all from the region of Santarém, in the west of the Brazilian state of Pará. Similar levels of genetic diversity were found in all the samples and surprisingly the breeding stock showed expressive representation of the genetic diversity registered on wild populations. These results contrast considerably with those of the previous study of farmed stocks in the states of Amapá, Pará, Piauí, and Rondônia, which recorded only two haplotypes, indicating a long history of endogamy in the breeding stocks used to produce fry. The results of the two studies show two distinct scenarios of tambaqui farming in the Amazon basin, which must be better evaluated in order to guarantee the successful expansion of this activity in the region, and the rest of Brazil, given that the tambaqui and its hybrids are now farmed throughout the country.

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