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Registros recuperados: 8
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Bridgehead effect in the worldwide invasion of the biocontrol Harlequin Ladybird Inra
Lombaert, E.; Guillemaud, T.; Cornuet, J.M.; Malausa, T.; Facon, B.; Estoup, A..
Recent studies of the routes of worldwide introductions of alien organisms suggest that many widespread invasions could have stemmed not from the native range, but from a particularly successful invasive population, which serves as the source of colonists for remote new territories. We call here this phenomenon the invasive bridgehead effect. Evaluating the likelihood of such a scenario is heuristically challenging. We solved this problem by using approximate Bayesian computation methods to quantitatively compare complex invasion scenarios based on the analysis of population genetics (microsatellite variation) and historical (first observation dates) data. We applied this approach to the Harlequin ladybird Harmonia axyridis (HA), a coccinellid native to...
Tipo: Journal Article Palavras-chave: ESPECE INVASIVE; COCCINELLE; COLONISATION; PREVENTION DES RISQUES COCCINELLIDAE; HARMONIA AXYRIDIS.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010951f6b93&uri=/notices/prodinra1/2010/11/
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Differences in oviposition behaviour of two sympatric sibling species of the Ostrinia genus Inra
Malausa, T.; Pélissié, B.; Piveteau, V.; Bourguet, D.; Ponsard, S..
Changes in host preferences are thought to be a major source of genetic divergence between phytophagous insect taxa. In western Europe, two sympatric taxa, O. nubilalis (the European corn borer) and O. scapulalis, feed mainly on maize and hop or mugwort, respectively. These two species may have diverged without geographic isolation after a host shift of ancestral populations onto maize or another cultivated species (e.g. sorghum). A previous study using inbred laboratory strains revealed that the two species differ in their oviposition choices in maize-mugwort tests. We sampled four natural populations in France (two of each taxon) and tested their oviposition behaviour toward four of their main host plant species: maize, sorghum, mugwort and hop. O....
Tipo: Journal Article Palavras-chave: SYMPATRIC SPECIATION; ECOLOGICAL SPECIATION; OSTRINIA NUBILALIS; OSTRINIA SCAPULALIS; EUROPEAN CORN BORER; HOST RACE; OST PREFERENCE; INSECT; COMPORTEMENT; COMPORTEMENT; EESPECE SYMPATRIQUE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200960c6c0b&uri=/notices/prodinra1/2011/04/
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Genetic structure and gene flow in French populations of two Ostrinia taxa: host races or sibling species? Inra
Malausa, T.; Dalecky, A.; Ponsard, S.; Audiot, P.; Streiff, R.; Chaval, Y.; Bourguet, D..
Most models of ecological speciation concern phytophagous insects in which speciation is thought to be driven by host shifts and subsequent adaptations of populations. Despite the ever-increasing number of studies, the current evolutionary status of most models remains incompletely resolved, as estimates of gene flow between taxa remain extremely rare. We studied the population genetics of two taxa of the Ostrinia genus — one feeding mainly on maize and the other on mugwort and hop — occurring in sympatry throughout France. The actual level of divergence of these taxa was unknown because the genetic structure of populations had been investigated over a limited geographical area and the magnitude of gene flow between populations had not been estimated. We...
Tipo: Journal Article Palavras-chave: PYRALE DU MAIS; APPROCHE BAYESIENNE; SPECIATION BAYESIAN APPROACHES; ECOLOGICAL SPECIATION; EUROPEAN CORN BORER; GENE FLOW; HOST RACE; HYBRIDIZATION; MICROSATELLITE; SYMPATRIC SPECIATION.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008363d5674&uri=/notices/prodinra1/2008/05/
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Genome-wide survey and analysis of microsatellites in nematodes, with a focus on the plant-parasitic species Meloidogyne incognita Inra
Castagnone, P.; Danchin, E.; Deleury, E.; Guillemaud, T.; Malausa, T.; Abad, P..
Background.Microsatellites are the most popular source of molecular markers for studying population genetic variation in eukaryotes. However, few data are currently available about their genomic distribution and abundance across the phylum Nematoda. The recent completion of the genomes of several nematode species, including Meloidogyne incognita, a major agricultural pest worldwide, now opens the way for a comparative survey and analysis of microsatellites in these organisms.Results.Using MsatFinder, the total numbers of 1-6 bp perfect microsatellites detected in the complete genomes of five nematode species (Brugia malayi, Caenorhabditis elegans, M. hapla, M. incognita, Pristionchus pacificus) ranged from 2,842 to 61,547, and covered from 0.09 to 1.20% of...
Tipo: Journal Article Palavras-chave: DIVERSITE GENETIQUE GENETIC DIVERSITY; POPULATION GENETICS; MICROSATELLITE MARKERS.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010b0148310&uri=/notices/prodinra1/2010/11/
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Isolation and characterization of microsatellites in the harlequin ladybird Harmonia axyridis (Coleoptera, Coccinellidae) and cross-species amplification within the family Coccinellidae Inra
Loiseau, A.; Malausa, T.; Lombaert, E.; Martin, J.F.; Estoup, A..
A total of 18 microsatellite DNA loci were isolated and characterized from the harlequin ladybird, Harmonia axyridis (Coleoptera: Coccinellidae). We optimized a multiplex panel consisting of two polymerase chain reactions, allowing the genotyping of all loci. The number of alleles and heterozygosity observed at each locus ranged from 1 to 12 and from 0 to 100%, respectively. After Bonferroni correction for multiple tests, none of the loci deviated significantly from Hardy-Weinberg equilibrium and there was no indication of significant linkage disequilibrium among pairs of loci. Successful cross-species amplification was obtained for only three of the seven tested species of Coccinellidae
Tipo: Journal Article Palavras-chave: COCCINELLE; COLEOPTERE; ESPECE INVASIVE; MICROSATELLITE BIOLOGICAL INVASION; INSECT; INVASIVE SPECIES; MICROSATELLITES; NUCLEAR MARKER.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200946b6d228&uri=/notices/prodinra1/2010/08/
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Molecular differentiation at nuclear loci in French host races of the European corn borer (Ostrinia nubilalis) Inra
Malausa, T.; Leniaud, L.; Martin, J.F.; Audiot, P.; Bourguet, D.; Ponsard, S.; Lee, S.F.; Harrison, R.G.; Dopman, E..
French populations of the European corn borer consist of two sympatric and genetically differentiated host races. As such, they are well suited to study processes that could be involved in sympatric speciation, but the initial conditions of host-race divergence need to be elucidated. Gene genealogies can provide insight into the processes involved in speciation. We used DNA sequences of four nuclear genes to (1) document the genetic structure of the two French host races previously delineated with allozyme markers, (2) find genes directly or indirectly involved in reproductive isolation between host races, and (3) estimate the time since divergence of the two taxa and see whether this estimate is compatible with this divergence being the result of a host...
Tipo: Journal Article Palavras-chave: PYRALE DU MAÏS; SPECIATION SYMPATRIQUE; POLYMORPHISME GENETIQUE OSTRINIA NUBILALIS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008292c351f&uri=/notices/prodinra1/2008/08/
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Phenotypic variation in invasive and biocontrol populations of the harlequin ladybird, Harmonia axyridis Inra
Lombaert, E.; Malausa, T.; Devred, R.; Estoup, A..
Despite numerous releases for biological control purposes during more than 20 years in Europe, Harmonia axyridis failed to become established until the beginning of the 21st century. Its status as invasive alien species is now widely recognised. Theory suggests that invasive populations should evolve toward greater phenotypic plasticity because they encounter differing environments during the invasion process. On the contrary, populations used for biological control have been maintained under artificial rearing conditions for many generations; they are hence expected to become specialised on a narrow range of environments and show lower phenotypic plasticity. Here we compared phenotypic traits and the extent of adaptive phenotypic plasticity in two...
Tipo: Journal Article Palavras-chave: ADAPTATIVE PHENOTYPIC PLASTICITY; ALIEN SPECIES; BIOLOGICAL CONTROL; HARMONIA AXYRIDIS; BIOLOGICAL INVASION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008bad0878a&uri=/notices/prodinra1/2010/11/
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Representativeness of microsatellite distributions in genomes, as revealed by 454 GS-FLX Titanium pyrosequencing Inra
Martin, J.F.; Pech, N.; Meglécz, E.; Ferreira, S.; Costedoat, C.; Dubut, V.; Malausa, T.; Gilles, A..
Background : Microsatellites are markers of choice in population genetics and genomics, as they provide useful insight into patterns and processes as diverse as genome evolutionary dynamics and demographic processes. The acquisition of microsatellites through multiplex-enriched libraries and 454 GS-FLX Titanium pyrosequencing is a promising new tool for the isolation of new markers in unknown genomes. This approach can also be used to evaluate the extent to which microsatellite-enriched libraries are representative of the genome from which they were isolated. In this study, we deciphered potential discrepancies in microsatellite content recovery for two reference genomes (Apis mellifera and Danio rerio), selected on the basis of their extreme heterogeneity...
Tipo: Journal Article Palavras-chave: MICROSATELLITE.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20108ec8cfc7&uri=/notices/prodinra1/2010/12/
Registros recuperados: 8
Primeira ... 1 ... Última
 

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