Consulta: subjectFacets:"Introgression"
Registros recuperados: 14
Data/hora: 06/06/2024 02:44:11

Variación morfológica y enzimática en una población de abejas (Apis mellifera) en proceso de africanización.
Provedor de dados: 32
Autores: Utrera Quintana, Fernando.
El impacto causado por la abeja africanizada en su llegada a México ha motivado la realización de pocos trabajos de investigación para aprovechar las características útiles de esta especie. El presente estudio se realizó con el objetivo de conocer el grado de hibridación de una muestra de la población formada por 37 colmenas de abejas euroafricanas establecidas en Montecillo. Se utilizaron tres pruebas para estimar el grado de africanización en la población. La prueba de Rinderer agrupó a las colmenas en cuatro grupos: abejas africanizadas (48.65%); africanizadas con introgresión de genes europeos (18.92%); europeas con introgresión de genes africanizados (8.11%); y europea (24.32%). El análisis de componentes principales (CP) con base en caracteres...
Palavras-chave: Introgresión; Euroafricanas; Morfología; Isoenzimas; Introgression; European honey bees Africanized; Morphology; Isozymes; Genética; Doctorado.
Ano: 2011
URL: http://hdl.handle.net/10521/652

Can habitat specialisation maintain a mosaic hybrid zone in marine bivalves?
Provedor de dados: 5
Autores: Bierne, Nicolas; David, Pierre; Langlade, Aime; Bonhomme, F.
Maintaining the integrity of differentiated genomes in marine organisms needs efficient isolation mechanisms, because planktonic larval dispersion provides contacts between taxa. Habitat specialisation is interesting in this respect, because it can both prevent interspecific crosses (each taxon reproduces in its own habitat) and eliminate hybrids (typically less fit than a parental taxon in each habitat). The contact zone between smooth-shelled mussels Mytilus edulis and M. galloprovincialis in Europe is a good example, as allozyme genotypes typical of both taxa seem to segregate into different habitats. However, allozymes may be selected directly and it is not known whether the same pattern can be extended to the whole genome. Here, we used 6 presumably...
Tipo: Text
Palavras-chave: Habitat specialisation; Hybrid zone; Introgression; Mytilus edulis; Mytilus galloprovincialis.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00000/10228/7597.pdf

The contribution of ancient admixture to reproductive isolation between European sea bass lineages
Provedor de dados: 5
Autores: Duranton, Maud; Allal, Francois; Valiere, Sophie; Bouchez, Olivier; Bonhomme, Francois; Gagnaire, Pierre-alexandre.
Understanding how new species arise through the progressive establishment of reproductive isolation (RI) barriers between diverging populations is a major goal in Evolutionary Biology. An important result of speciation genomics studies is that genomic regions involved in RI frequently harbor anciently diverged haplotypes that predate the reconstructed history of species divergence. The possible origins of these old alleles remain much debated, as they relate to contrasting mechanisms of speciation that are not yet fully understood. In the European sea bass (Dicentrarchus labrax), the genomic regions involved in RI between Atlantic and Mediterranean lineages are enriched for anciently diverged alleles of unknown origin. Here, we used haplotype-resolved...
Tipo: Text
Palavras-chave: Ancient admixture; Introgression; Reproductive isolation; Genomic conflicts; Marine fish.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00636/74768/74920.pdf

Genetic Characterization of Cupped Oyster Resources in Europe Using Informative Single Nucleotide Polymorphism (SNP) Panels
Provedor de dados: 5
Autores: Lapegue, Sylvie; Heurtebise, Serge; Cornette, Florence; Guichoux, Erwan; Gagnaire, Pierre-alexandre.
The Pacific oyster, Crassostrea gigas, was voluntarily introduced from Japan and British Columbia into Europe in the early 1970s, mainly to replace the Portuguese oyster, Crassostrea angulata, in the French shellfish industry, following a severe disease outbreak. Since then, the two species have been in contact in southern Europe and, therefore, have the potential to exchange genes. Recent evolutionary genomic works have provided empirical evidence that C. gigas and C. angulata exhibit partial reproductive isolation. Although hybridization occurs in nature, the rate of interspecific gene flow varies across the genome, resulting in highly heterogeneous genome divergence. Taking this biological property into account is important to characterize genetic...
Tipo: Text
Palavras-chave: Cupped oysters; Population genetics; Introgression; Conservation; Shellfisheries.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00623/73544/72938.pdf

SSR-based analysis of clonality, spatial genetic structure and introgression from the Lombardy poplar into a natural population of Populus nigra L. along the Loire River
Provedor de dados: 5
Autores: Chenault, Nicolas; Arnaud-haond, Sophie; Juteau, Mary; Valade, Romain; Almeida, Jose-luis; Villar, Marc; Bastien, Catherine; Dowkiw, Arnaud.
A scarcity of favourable habitats and introgression from exotic cultivars are two major threats to black poplars (Populus nigra L.) in Europe. Natural vegetative propagation contributes to maintenance of the species in areas where seedling recruitment is limited. Exhaustive sampling of all mature trees in a natural P. nigra stand (413 individuals at recorded positions), genotyping at 11 SSR loci, and a standardized analysis framework resulted in a precise description of clonality in terms of (a) frequency, (b) spatial growth form, and (c) impacts on the overall spatial genetic structure (SGS). The high proportion of replicated genotypes detected resulted in a genotypic richness (R) of 0.47. Up to 18 ramets were found per multilocus lineage (MLL), but 95%...
Tipo: Text
Palavras-chave: Populus nigra; Lombardy poplar; Clonality; Spatial genetic structure; Introgression; Clonal growth form.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00065/17617/18016.pdf

Systematic notes on Asian birds. 49. A preliminary review of the Aegithalidae, Remizidae and Paridae
Provedor de dados: 16
Autores: Eck, S.; Martens, J.
Proposed recent taxonomic changes in Paridae, Aegithalidae, and Remizidae are reviewed within the geographic scope of this series and their reliability is discussed in terms of the Biological Species Concept with respect to secondary contacts, hybridization, introgression, bioacoustics, and molecular genetics. Certain previously unpublished data are added to support the taxonomic decisions.
Tipo: Article / Letter to the editor
Palavras-chave: Paridae; Aegithalidae; Remizidae; Species limits; Systematics; Taxonomy; Eastern Palaearctic region; Indo-Malayan region; Morphology; Bioacoustics; Molecular genetics; Secondary contacts; Hybridisation; Introgression; 42.83.
Ano: 2006
URL: http://www.repository.naturalis.nl/record/209958

Evolutionary history of the sequestrate genus Rossbeevera (Boletaceae) reveals a new genus Turmalinea and highlights the utility of ITS minisatellite-like insertions for molecular identification
Provedor de dados: 16
Autores: Orihara, T.; Lebel, T.; Ge, Z.-W.; Smith, M.E.; Maekawa, N.
The sequestrate (truffle-like) basidiomycete genera Rossbeevera, Chamonixia, and Octaviania are closely related to the epigeous mushroom genera Leccinum and Leccinellum. In order to elucidate the properties and placement of several undescribed sequestrate taxa in the group and to reveal the evolutionary history of Rossbeevera and its allies, we conducted phylogenetic analyses based on three nuclear (ITS, nLSU, EF-1α) and two mitochondrial DNA loci (ATP6 and mtSSU) as well as precise morphological observations. Phylogenetic analyses of three nuclear loci suggest a complex evolutionary history with sequestrate fruiting bodies present in several clades, including a previously unrecognized sister clade to Rossbeevera. Here we propose a new sequestrate genus,...
Tipo: Article / Letter to the editor
Palavras-chave: Biogeography; Cryptic species; DNA barcoding; Hypogeous fungi; Introgression; Species tree.
Ano: 2016
URL: http://www.repository.naturalis.nl/record/611857

Genetic identification of interspecific hybrid of Neotropical catfish species (Pseudoplatystoma corruscans vs. Pseudoplatystoma reticulatum) in rivers of Mato Grosso do Sul State, Brazil
Provedor de dados: 83
Autores: Vaini,Jussara Oliveira; Grisolia,Alexéia Barufatti; Prado,Fernanda Dotti do; Porto-Foresti,Fábio.
Hybrids of the species Pseudoplatystoma corruscansvs.Pseudoplatystoma reticulatum are extensively traded because they are more docile and precocious compared to their parents. This study aimed to identify the occurrence of hybrid 'Surubim' in rivers of the State of Mato Grosso do Sul, applying molecular techniques. Pseudoplatystoma corruscans, Pseudoplatystoma reticulatum and hybrid 'Surubim' were detected using multiplex PCR and PCR-RFLP in RAG2, GLOBIN, EF1α, 18S rRNA nuclear genes, and mitochondrial 16S rRNA gene. The results revealed the presence of F1 hybrids in rivers and the occurrence of genetic introgression, evidenced by the Post-F1 hybrids. Furthermore, discrepancies between the morphological and genetic identification were observed,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Fish; Hybridization; Introgression; Molecular markers.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000300635

Production of fertile progeny from interspecific incompatible cross Cajanus platycarpus × C. cajan
Provedor de dados: 30
Autores: Mallikarjuna, N.,( Nalini Mallikarjuna ).
Palavras-chave: Pigeonpeas; Gene pools; Backcrossing; Hybrids; Genes; Genomes; Introgression; Mosses; Chickpeas; Self pollination.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3291

Evidence of natural hybridization and introgression in Bulbophyllum involutum Borba, Semir &amp;amp; F. Barros and B. weddellii (Lindl.) Rchb. f. (Orchidaceae) in the Chapada Diamantina, Brazil, by using allozyme markers
Provedor de dados: 88
Autores: Azevedo,Cecília O.; Borba,Eduardo L.; Van Den Berg,Cássio.
Hybridization between B. involutum and B. weddellii (Orchidaceae) has been first observed in the Serra do Cipó, Minas Gerais State, Brazil, the hybrid being described as B. ×cipoense Borba &amp;amp; Semir. In this study, allozime electrophoresis was used to test the hypothesis of occurrence of hybridization between these two species, as suggested by morphological characters, in the Chapada Diamantina, Bahia State, Brazil. The lack of a diagnostic locus does not allow definite confirmation of the natural hybridization, although this hypotheses is reinforced by the absence of exclusive alleles in the putative hybrid individuals. The existence of several different genotypes points out to either population derived from multiple hybridization events or the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bulbophyllum; Genetic variability; Hybridization; Introgression; Orchidaceae.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000300008

Hybrids between Pseudoplatystoma corruscans and P. reticulatum (Siluriformes: Pimelodidae) previously reported in the Upper Paraná River are likely escapes from aquaculture farms: evidence from microsatellite markers
Provedor de dados: 103
Autores: Baggio,Rafael A.; Moretti,Caroline B.; Bialetzki,Andréa; Boeger,Walter A.
ABSTRACT The production of hybrids of the 'pintado', Pseudoplatystoma corruscans (Spix &amp; Agassiz, 1829) and 'cachara', Pseudoplatystoma reticulatum (Eigenmann &amp; Eigenmann, 1889) in captivity has generated many concerns about the possibility of introduction of farmed hybrids into natural environments. In the last decade, hybrids between these species, known as 'pintachara' or 'cachapinta', were reported from different regions of the Upper Paraná River basin. Prospection of these hybrids is important in order to orient conservation programs for the species involved. Knowledge of the presence of these hybrids will direct conservation strategies towards prevention and/or mitigation of the effects of cross breeding in natural populations of P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation genetics; Fish larvae; Interspecific hybrids; Introgression; Molecular markers.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702016000201303

Morphological and genetic perspectives of hybridization in two contact zones of closely related species of Petunia (Solanaceae) in southern Brazil
Provedor de dados: 39
Autores: Teixeira,Marcelo C.; Turchetto,Caroline; Hartke,Sara; Schnitzler,Carolina K.; Freitas,Loreta B.
ABSTRACT Interspecific hybridization has several consequences for parental species, from blurring species limits to the emergence of new taxa. Petunia axillaris and P. exserta occur in sympatry in southernmost Brazil and naturally hybridize despite their different pollination syndromes and habitat requirements. We employed genetic and morphological analyses to characterize two contact zones between the species with the aim of determining the effect of interspecific hybridization. Microsatellite loci and a morphometric evaluation of the corolla shape were used to classify individuals based on their origin as pure parental or hybrids. Corolla color was used to classify individuals a priori (white, red or intermediate, for P. axillaris, P. exserta or hybrid,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic diversity; Hybridization; Introgression; Morphometric analysis; Petunia.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000400734

Species boundary and extensive hybridization and introgression in Petunia
Provedor de dados: 39
Autores: Turchetto,Caroline; Schnitzler,Carolina K.; Freitas,Loreta B.
ABSTRACT Studying the role of hybridization in the speciation of plants is one of the most thrilling areas of evolutionary biology. Hybridization in natural populations can act in opposition to divergence, contribute to adaptation through introgression or foster the emergence of new lineages via hybrid speciation. Species of the plant genus Petunia grow in open areas in southern South America. Some natural interspecific hybrid events have been described for the genus, such as between the endemic P. exserta and the widespread P. axillaris. Both species occur in sympatry in Serra do Sudeste (Brazil), where they occur in diverse habitats and exhibit floral divergence, which has been related to the attraction of different primary pollinators. The present study...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gene exchange; Hybridization; Inbreeding; Introgression; Microsatellite; Petunia; Species limits.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000400724

A hybrid swarm of manatees along the Guianas coastline, a peculiar environment under the influence of the Amazon River plume
Provedor de dados: 42
Autores: LIMA,CAMILLA S.; MAGALHÃES,RAFAEL F.; MARMONTEL,MIRIAM; MEIRELLES,ANA CAROLINA; CARVALHO,VITOR LUZ; LAVERGNE,ANNE; THOISY,BENOIT DE; SANTOS,FABRÍCIO R.
Abstract: The West Indian (Trichechus manatus) and Amazonian (T. inunguis) manatees have a sympatric occurrence at the mouth of the Amazon River. A result of this interspecific encounter is the occurrence of hybrids, which are frequently found along the coasts of Amapá state in Brazil, French Guiana and Guyana. Here we present new genetic evidence indicating the occurrence of a hybrid swarm along the Guianas Shield coastline, which is an interspecific hybrid zone that also separates T. manatus populations located east (Brazil) and west (Caribbean, Gulf of Mexico, Florida and Antilles). In addition, we suggest that this hybrid population occupies a peculiar mangrove-rich environment under strong influence of the Amazon River plume, which requires an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation Genetics; Hybrid zone; Introgression; Amazon River plume; Guianas coastline; Trichechus.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600615