Exploring the role of asexual multiplication in poplar rust epidemics: impact on diversity and genetic structure

2012 ◽  
Vol 21 (20) ◽  
pp. 4996-5008 ◽  
Author(s):  
Benoît Barrès ◽  
Cyril Dutech ◽  
Axelle Andrieux ◽  
Fabien Halkett ◽  
Pascal Frey
Keyword(s):  
Genetic Structure ◽  
Asexual Multiplication

Extensive hybridization between two Andean warbler species with shallow divergence in mtDNA

The Auk ◽  
2021 ◽  
Vol 138 (1) ◽  
Author(s):  
Laura N Céspedes-Arias ◽  
Andrés M Cuervo ◽  
Elisa Bonaccorso ◽  
Marialejandra Castro-Farias ◽  
Alejandro Mendoza-Santacruz ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Contact Zone ◽  
Hybrid Zone ◽  
Secondary Contact ◽  
Tropical Andes ◽  
Phenotypic Data ◽  
Geographic Ranges ◽  
Intermediate Phenotypes ◽  
Ecological Barriers

Abstract Studying processes acting on differentiated populations upon secondary contact, such as hybridization, is important to comprehensively understand how species are formed and maintained over time. However, avian speciation studies in the tropical Andes have largely focused on the role of topographic and ecological barriers promoting divergence in allopatry, seldom examining hybridization and introgression. We describe a hybrid zone involving 2 closely related Andean warblers (Parulidae), the Golden-fronted Redstart (Myioborus ornatus), and the Spectacled Redstart (Myioborus melanocephalus). Geographic ranges of these species abut near the Colombia-Ecuador border and many specimens from the region exhibit intermediate phenotypes, but a formal description of phenotypic variation in the contact zone was heretofore lacking. We collected specimens across a transect encompassing the area where ranges abut and areas where only “pure” parental phenotypes of M. ornatus chrysops and M. melanocephalus ruficoronatus occur. We described variation in plumage traits including patterns of head and ventral coloration and tail markings based on 321 specimens. To describe genetic variation in the contact zone and over a broader phylogeographic context, we used sequences of the mitochondrial ND2 gene for 219 individuals across the transect and the entire range of both species, including all subspecies, from Venezuela to Bolivia. We documented a hybrid zone ~200 km wide based on head coloration, where intermediate plumage phenotypes are most common and “pure” forms do not overlap geographically, consistent with extensive hybridization. Across the range of the M. ornatus–M. melanocephalus complex, mitochondrial genetic structure was shallow, with genetic breaks only coinciding clearly with one topographic feature. Such a low genetic structure is striking given the high diversity in plumage phenotypes and the current taxonomy of the group. Our phenotypic data suggest that barriers to hybridization are not strong, and allow us to postulate hypotheses to be tested using forthcoming genomic data.

The role of life-history traits, selective pressure and hydrographic boundaries in shaping the genetic structure of the transparent goby,Aphia minuta

2015 ◽  
Vol 37 (3) ◽  
pp. 518-531 ◽  
Author(s):  
Paolo Ruggeri ◽  
Andrea Splendiani ◽  
Massimo Giovannotti ◽  
Tatiana Fioravanti ◽  
Giulia Occhipinti ◽  
...  
Keyword(s):  
Life History ◽  
Genetic Structure ◽  
Life History Traits ◽  
Selective Pressure

scholarly journals Genetic structure and demographic inference of the regular sea urchin Sterechinus neumayeri (Meissner, 1900) in the Southern Ocean: The role of the last glaciation

PLoS ONE ◽  
2018 ◽  
Vol 13 (6) ◽  
pp. e0197611 ◽  
Author(s):  
Angie Díaz ◽  
Karin Gérard ◽  
Claudio González-Wevar ◽  
Claudia Maturana ◽  
Jean-Pierre Féral ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Southern Ocean ◽  
Sea Urchin ◽  
Sterechinus Neumayeri ◽  
Last Glaciation ◽  
Demographic Inference

Abstract PR08: The role of genetic structure in Colombian coastal and Andean populations on disparities in colorectal adenomas and cancer risk

2016 ◽  
Author(s):  
Maria Carolina Sanabria-Salas ◽  
Gustavo Adolfo Hernández-Suárez ◽  
Adriana Umaña-Pérez ◽  
Martha Lucía Serrano-Pérez ◽  
Myriam Sánchez de Gómez ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Cancer Risk ◽  
Colorectal Adenomas

scholarly journals The Genetic Structure of a Maize Population: The Role of Dominance

Crop Science ◽  
2007 ◽  
Vol 47 (2) ◽  
pp. 467-474 ◽  
Author(s):  
Brandon M. Wardyn ◽  
Jode W. Edwards ◽  
Kendall R. Lamkey
Keyword(s):  
Genetic Structure ◽  
Maize Population

Flatworm asexual multiplication implicates stem cells and regeneration

2004 ◽  
Vol 82 (2) ◽  
pp. 334-356 ◽  
Author(s):  
Maria Reuter ◽  
Natalia Kreshchenko
Keyword(s):  
Stem Cells ◽  
Pluripotent Stem Cells ◽  
Early Stage ◽  
Gradient System ◽  
Decisive Importance ◽  
Present Information ◽  
Asexual Multiplication ◽  
Primitive Feature ◽  
Head Regeneration

The phenomenon of asexual multiplication is rare in the animal kingdom, but it occurs in all main flatworm taxa. In the present paper, we review data regarding the presence of different forms of asexual multiplication in flatworms and argue that the presence of a population of totipotent or pluripotent stem cells, "neoblasts", is a primitive feature of decisive importance for the developing potential of flatworms. Next we present information on the role of stem cells in fission, head regeneration, and pharynx regeneration of planarians. Furthermore, the tracing of neoblasts in lower flatworms and cestodes is presented, and the results indicating heterogeneity of the neoblast pool are discussed. Finally, the mode by which the neoblasts are stimulated to divide, migrate, and differentiate and the nature of the interactions are discussed. We focus on (i) biogenic amines and neuropeptides, (ii) the role of neuropeptides in the early stage of regeneration, (iii) the evidence for the influences of growth factors and nitric oxide, and (iv) the influence of weak electromagnetic fields. We discuss the pattern in which a gradient system of morphogens and (or) a hierarchical system of inductions is expressed in development.

The subtle role of climate change on population genetic structure in Canada lynx

2014 ◽  
Vol 20 (7) ◽  
pp. 2076-2086 ◽  
Author(s):  
Jeffrey R. Row ◽  
Paul J. Wilson ◽  
Celine Gomez ◽  
Erin L. Koen ◽  
Jeff Bowman ◽  
...  
Keyword(s):  
Climate Change ◽  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Canada Lynx
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