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Registros recuperados: 4
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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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Dispersal strategies of phytophagous insects at a local scale: adaptive potential of aphids in an agricultural environment Inra
Lombaert, E.; Boll, R.; Lapchin, L..
Background: The spread of agriculture greatly modified the selective pressures exerted by plants on phytophagous insects, by providing these insects with a high-level resource, structured in time and space. The life history, behavioural and physiological traits of some insect species may have evolved in response to these changes, allowing them to crowd on crops and to become agricultural pests. Dispersal, which is one of these traits, is a key concept in evolutionary biology but has been over-simplified in most theoretical studies. We evaluated the impact of the local-scale dispersal strategy of phytophagous insects on their fitness, using an individual-based model to simulate population dynamics and dispersal between leaves and plants, by walking and...
Tipo: Journal Article Palavras-chave: APHIDS; PHYTOPHAGOUS; POPULATION DYNAMICS; DISPERSAL STRATEGY; MODEL; PLANT CHARACTERISTICS; EVOLUTION.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007b56bf41e&uri=/notices/prodinra1/2009/10/
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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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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/
Registros recuperados: 4
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