Genetic structure in parasitic Rhinanthus angustifolius is determined by geographical distance rather than habitat - implications for taxonomy and conservation

2018 ◽  
Vol 36 (12) ◽  
Author(s):  
Anneli Jonstrup ◽  
Stefan Andersson ◽  
Mikael Hedrén
Keyword(s):  
Genetic Structure ◽  
Geographical Distance ◽  
Rhinanthus Angustifolius

Linking between genetic structure and geographical distance: Study of the maternal gene pool in the Ethiopian population

2016 ◽  
Vol 44 (1) ◽  
pp. 53-69 ◽  
Author(s):  
Francesco Messina ◽  
Giuseppina Scano ◽  
Irene Contini ◽  
Cristina Martínez-Labarga ◽  
Gian Franco De Stefano ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Gene Pool ◽  
Geographical Distance ◽  
Maternal Gene

scholarly journals Isozyme and RAPD studies in Prosopis glandulosa and P. Velutina (Leguminosae, Mimosoideae)

2000 ◽  
Vol 23 (3) ◽  
pp. 639-648 ◽  
Author(s):  
Cecilia Bessega ◽  
Beatriz O. Saidman ◽  
Juan C. Vilardi
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
Genetic Variability ◽  
Genetic Differentiation ◽  
Rapd Markers ◽  
Random Amplified Polymorphic Dna ◽  
Mantel Test ◽  
Prosopis Glandulosa ◽  
Geographical Distance ◽  
Taxonomic Studies

Allozyme and random amplified polymorphic DNA (RAPD) techniques have been compared for their usefulness for genetic and taxonomic studies in Prosopis glandulosa and P. velutina populations. Isozymes and RAPDs yielded similarly high estimates of genetic variability. Genetic structure and differentiation were analyzed through non-hierarchical Wright's F DT. For all populations considered, both markers produced low gene flow (Nm < 1) estimates. When only P. glandulosa populations were analyzed, isozyme data yielded higher gene flow estimates (Nm > 1), in agreement with that expected for conspecific populations. However, in RAPD data the expected reduction in F DT and the increase in Nm were not observed. Correlation between F DT and geographical distance matrices (Mantel test) for all populations was significant (P = 0.02) when based on isozymes, but not so (P = 0.33) when based on RAPDs. No significant associations among genetic and geographical or climatic variables were observed. Two isoenzyme systems (GOT and PRX) enabled us to distinguish between P. glandulosa and P. velutina, but no diagnostic band for recognition of populations or species studied here were detected by RAPD. However, RAPD markers showed higher values for genetic differentiation among conspecific populations of P. glandulosa and a lower coefficient of variation than those obtained from isozymes.

scholarly journals High genetic diversity and strong genetic structure of Strongyllodes variegatus populations in oilseed rape production areas of China

2020 ◽  
Author(s):  
HaiXia Zhan ◽  
ZhongPing Hao ◽  
Rui Tang ◽  
LiNi Zhu ◽  
JingJiang Zhou ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Oilseed Rape ◽  
Demographic History ◽  
Insect Pest ◽  
Distribution Analysis ◽  
Geographical Distance ◽  
Geographical Regions ◽  
Genetic Diversity And Structure ◽  
Production Areas

Abstract Background: Strongyllodes variegatus (Fairmaire) is a major insect pest of oilseed rape in China. Despite its economic importance, the contribution of its population genetics in the development of any suitable protection control strategy for the management of oilseed rape crops is poorly studied. It is a much urgent need to prevent its spread to the rest of the world. Results: Using the sequences of mitochondrial DNA cytochrome c oxidase subunit I (COI) and cytochrome b (Cytb) as genetic markers, we analyzed the population genetic diversity and structure of 437 individuals collected from 15 S. variegates populations located in different oilseed rape production areas in China. In addition, we estimated the demographic history using neutrality test and mismatch distribution analysis. The high level of genetic diversity was detected among the COI and Cytb sequences of S. variegates. The population structure analyses strongly suggested three distinct genetic and geographical regions in China with limited gene flow. The Mantel test showed that the genetic distance was greatly influenced by the geographical distance. The demographic analyses showed that S. variegates had experienced population fluctuation during the Pleistocene Epoch, which was likely to be related to the climatic changes.Conclusion: Overall, these results demonstrate that the strong genetic structure of S. variegates populations in China, which is attributed by the isolation through the geographical distance among populations, their weak flight capacity and subsequent adaptation to the regional ecological conditions.

Meso-scale genetic structure of the intertidal, crevice-dwelling, stalked barnacleIbla cumingi(Crustacea: Cirripedia): an interplay of life history and local hydrographic conditions

2010 ◽  
Vol 91 (1) ◽  
pp. 173-180 ◽  
Author(s):  
Priscilla T.Y. Leung ◽  
Brian Morton ◽  
W.C. Ng
Keyword(s):  
Life History ◽  
Hong Kong ◽  
Genetic Structure ◽  
Random Amplified Polymorphic Dna ◽  
Geographical Distance ◽  
Genetic Structuring ◽  
Open Coast ◽  
Hydrographic Conditions ◽  
Tolo Harbour ◽  
Meso Scale

Variation in life history characteristics is believed to play an important role in dispersal and thus shaping the population and genetic structure of marine invertebrates. The genetic structure ofIbla cumingi, a small intertidal stalked barnacle that broods lecithotrophic larvae, was evaluated using 145 random amplified polymorphic DNA markers on 100 individuals from five locations across Hong Kong waters. Shallow genetic structure was observed along open-coast shores, and there was no indication of isolation by geographical distance. A significant genetic divergence, however, was observed between samples inside and outside Tolo Harbour, a semi-enclosed, sheltered and estuarine bay located in the north-eastern quadrant of Hong Kong, indicating the presence of a genetic sub-structuring pattern. In addition, relatively lower genetic diversities were described for samples inside Tolo Harbour than those from open-coast shores. This could be associated with an increase in inbreeding events attributed to local settlement caused by larval retention. This study provides an insight into how the interaction of life history and local, enclosed, hydrographic conditions could result in a substantial genetic structuring ofI. cumingiover a meso-scale geographical distance.

scholarly journals The influence of environmental heterogeneity on the morphological and genetic diversity of Circaea lutetiana (Onagraceae) in Hyrcanian forests

2021 ◽  
Vol 78 (1) ◽  
pp. e110
Author(s):  
Sedigheh Nikzat ◽  
Somayeh Ghasemzadeh-Baraki ◽  
Somayeh Naghiloo
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Environmental Heterogeneity ◽  
Environmental Gradients ◽  
Annual Rainfall ◽  
Gene Pools ◽  
Geographical Distance ◽  
Hyrcanian Forests ◽  
Genetic Clustering ◽  
Genetic Pool

Environmental gradients are important factors that can potentially influence the genetic diversity and differentiation of populations. The present study examines the effect of environmental heterogeneity of the Hyrcanian forests on populations of Circaea lutetiana L. (Onagraceae). Using morphometrics, scanning electron microscopy (SEM) of leaf epidermis, and molecular markers, we analyzed genetic diversity and differentiation among nine populations from environmentally divergent habitats. Three different gene pools were observed. Our results indicate that the genetic structure is significantly correlated to environmental factors, but not to the geographical distance. Genetic clustering in C. lutetiana is affected by temperature, humidity, elevation, and average annual rainfall. Overall, our data indicate that gene flow does not contribute to explaining spatial patterns of genetic structure and the adaptation to the environment is the main factor shaping the genetic structure of the C. lutetiana populations. The populations belonging to each of the three gene pools have similarities in microclimate parameters, despite their geographical proximity, and populations from the same genetic pool can be up to 470 km apart. This evidence, as well as morphological and genetic similarities of the populations with greater geographical distance, suggest the possibility of cryptic speciation in this species.

Geographical distance and physical barriers shape the genetic structure of Eurasian red squirrels (Sciurus vulgaris) in the Italian Alps

2005 ◽  
Vol 14 (2) ◽  
pp. 469-481 ◽  
Author(s):  
I. TRIZIO ◽  
B. CRESTANELLO ◽  
P. GALBUSERA ◽  
L. A. WAUTERS ◽  
G. TOSI ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Geographical Distance ◽  
Sciurus Vulgaris ◽  
Italian Alps ◽  
Red Squirrels ◽  
Physical Barriers

scholarly journals Geographical range size and latitude predict population genetic structure in a global survey

2018 ◽  
Vol 14 (1) ◽  
pp. 20170566 ◽  
Author(s):  
Tara A. Pelletier ◽  
Bryan C. Carstens
Keyword(s):  
Machine Learning ◽  
Genetic Diversity ◽  
Genetic Structure ◽  
Dna Sequences ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Environmental Gradients ◽  
Geographical Distance ◽  
Total Size ◽  
Learning Framework

While genetic diversity within species is influenced by both geographical distance and environmental gradients, it is unclear what other factors are likely to promote population genetic structure. Using a machine learning framework and georeferenced DNA sequences from more than 8000 species, we demonstrate that geographical attributes of the species range, including total size, latitude and elevation, are the most important predictors of which species are likely to contain structured genetic variation. While latitude is well known as an important predictor of biodiversity, our work suggests that it also plays a key role in shaping diversity within species.

scholarly journals High genetic diversity and strong genetic structure of Strongyllodes variegatus (Coleoptera: Nitidulidae) demonstrate the population history of its distribution in oilseed rape production areas in China

2020 ◽  
Author(s):  
HaiXia Zhan ◽  
ZhongPing Hao ◽  
Rui Tang ◽  
LiNi Zhu ◽  
JingJiang Zhou ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Oilseed Rape ◽  
Population Genetic ◽  
Distribution Analysis ◽  
Geographical Distance ◽  
Population Structure Analysis ◽  
Geographical Regions ◽  
Genetic Diversity And Structure ◽  
Production Areas

Abstract Background: Strongyllodes variegatus (Fairmaire) is a major insect pest of oilseed rape in China. Despite its economic importance, the contribution of its population genetics in the development of suitable protection control strategy for oilseed rape crops is poorlys tudied. Using the sequences mitochondrial DNA cytochrome c oxidase subunit I (COI ) and cytochrome b (Cytb ) as genetic markers, we analyzed population genetic diversity and structure of 437 individuals collected from 15 S. variegates populations located in different oilseed rape production areas in China. In addition, we estimated the demographic history using neutrality test and mismatch distribution analysis. Results: The high level of genetic diversity was detected among the COI and Cytb sequences of S. variegates . The population structure analysis strongly suggested three distinct genetic and geographical regions in China with limited gene flow. The Mantel test showed that the genetic distance was greatly influenced by the geographical distance. The demographic analyses showed that S. variegates experienced population fluctuation during the Pleistocene Epoch, which was likely to be related to the climatic changes. Conclusion: Overall, these results demonstrate that the strong population genetic structure of S. variegates in China may is attributed to the isolation through the geographical distance among populations, their weak flight capacity and subsequently adaptation to the regional ecological conditions.

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