scholarly journals Genetic analysis of a contact zone between two lineages of the ocellated lizard (Lacerta lepidaDaudin 1802) in south-eastern Iberia reveal a steep and narrow hybrid zone

2012 ◽  
Vol 51 (1) ◽  
pp. 45-54 ◽  
Author(s):  
Andreia Miraldo ◽  
Christiana Faria ◽  
Godfrey M. Hewitt ◽  
Octavio S. Paulo ◽  
Brent C. Emerson
Keyword(s):  
Genetic Analysis ◽  
Contact Zone ◽  
Hybrid Zone ◽  
South Eastern

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.

How often do they do it? An in-depth analysis of the hybrid zone of two grass snake species (Natrix astreptophora and Natrix helvetica)

2020 ◽  
Vol 131 (4) ◽  
pp. 756-773
Author(s):  
Marika Asztalos ◽  
Nadine Schultze ◽  
Flora Ihlow ◽  
Philippe Geniez ◽  
Matthieu Berroneau ◽  
...  
Keyword(s):  
Contact Zone ◽  
Hybrid Zone ◽  
Climatic Conditions ◽  
Secondary Contact ◽  
Distribution Models ◽  
Long Distance ◽  
Depth Analysis ◽  
Grass Snake ◽  
Genetic Signatures ◽  
Cline Width

Abstract We examined the contact zone of two parapatric species of grass snake (Natrix astreptophora and Natrix helvetica) in southern France. To this end, we used comprehensive sampling, analysed mtDNA sequences and microsatellite loci, and built Species Distribution Models for current and past climatic conditions. The contact zone had established by the mid-Holocene during range expansions from glacial refuges in the Iberian Peninsula (N. astreptophora) and southern or western France (N. helvetica). The contact zone represents a narrow bimodal hybrid zone, with steep genetic transition from one taxon to the other and rare hybridization, supporting species status for N. astreptophora and N. helvetica. Our results suggest that the steepness of the clines is a more robust tool for species delimitation than cline width. In addition, we discovered in western France, beyond the hybrid zone, a remote population of N. helvetica with genetic signatures of hybridization with N. astreptophora, most likely the result of human-mediated long-distance dispersal. For N. helvetica, we identified a southern and a northern population cluster, connected by broad-scale gene flow in a unimodal hybrid zone running across France. This pattern either reflects genetic divergence caused by allopatry in two microrefuges and subsequent secondary contact or introgression of foreign alleles into the southern cluster.

Genetic Analysis of a Broad Hybrid Zone in Aesculus (Sapindaceae): Is There Evidence of Long‐Distance Pollen Dispersal?

2008 ◽  
Vol 169 (5) ◽  
pp. 647-657 ◽  
Author(s):  
David T. Thomas ◽  
Adjoa R. Ahedor ◽  
Charles F. Williams ◽  
Claude dePamphilis ◽  
Daniel J. Crawford ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Hybrid Zone ◽  
Pollen Dispersal ◽  
Long Distance

The Litoria-Ewingi Complex (Anura, Hylidae) in South-Eastern Australia .9. Variation in Mitochondrial-Dna Across a Narrow Zone of Hybridization Between Litoria-Ewingi and Litoria-Paraewingi

1990 ◽  
Vol 38 (1) ◽  
pp. 53 ◽  
Author(s):  
SL Dennington
Keyword(s):  
Mitochondrial Dna ◽  
Hybrid Zone ◽  
Enzyme Analysis ◽  
Advertisement Call ◽  
Restriction Enzyme Analysis ◽  
Southern Limit ◽  
Allopatric Populations ◽  
South Eastern ◽  
Eastern Australia ◽  
South Eastern Australia

The mitochondrial DNA (mtDNA) of Litoria ewingi and L. paraewingi, two species of hylid frog occurring in south-eastern Australia, was investigated by restriction enzyme analysis. Clear diagnostic differences between allopatric populations of these two species were shown in several of the fragment patterns. MtDNA haplotypes of individuals from populations along a transect across the southern hybrid zone between L. ewingi and L. paraewingi were identified. Four individuals from these hybrid populations had inherited a unique haplotype of mtDNA. The width of the hybrid zone based on variation in mtDNA, is at least 5 km. The southern limit of introgression of mtDNA typical of L. paraewingi coincides with the southern limit based on call variation. However, mtDNA typical of L. ewingi was not found as far north as expected by other criteria. The relationship between mtDNA haplotype and structure of advertisement call in individuals from populations in the hybrid zone was analysed. The species-specificity of mtDNA established for allopatric populations held for all but two of the ten recorded putative parental males. Surprisingly, three of the four hybrids based on call structure had inherited mtDNA characteristic of L. ewingi.

scholarly journals Genetic Analysis of a Cryptic Contact Zone between Mitochondrial Clades of the Eastern Red-Backed Salamander, Plethodon cinereus

2019 ◽  
Vol 53 (2) ◽  
pp. 144 ◽  
Author(s):  
Brian P. Waldron ◽  
Shawn R. Kuchta ◽  
Maggie M. Hantak ◽  
Cari-Ann M. Hickerson ◽  
Carl D. Anthony
Keyword(s):  
Genetic Analysis ◽  
Contact Zone ◽  
Plethodon Cinereus

scholarly journals GENETIC ANALYSIS OF A CHROMOSOMAL HYBRID ZONE IN THE AUSTRALIAN MORABINE GRASSHOPPERS (VANDIEMENELLA,VIATICASPECIES GROUP)

Evolution ◽  
2009 ◽  
Vol 63 (1) ◽  
pp. 139-152 ◽  
Author(s):  
Takeshi Kawakami ◽  
Roger K. Butlin ◽  
Mark Adams ◽  
David. J. Paull ◽  
Steven J. B. Cooper
Keyword(s):  
Genetic Analysis ◽  
Hybrid Zone
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