References of "Mahy, Grégory"
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See detailLe cotoneaster horizontal sur pelouses calcicoles: de l'ornement à la gestion
Piqueray, Julien ULg; Halford, Mathieu ULg; Massoz, Aurélie ULg et al

in Parcs & Réserves (2009), 64(4), 23-26

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See detailÉvolution des traits d’histoire de vie lors des invasions végétales
Monty, Arnaud ULg; Mahy, Grégory ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2009), 13(3), 449-458

Les invasions par les plantes, malgré les problèmes qu’elles engendrent, sont des opportunités d’étude des phénomènes évolutifs rapides. Dans cet article sont présentés les principaux changements ... [more ▼]

Les invasions par les plantes, malgré les problèmes qu’elles engendrent, sont des opportunités d’étude des phénomènes évolutifs rapides. Dans cet article sont présentés les principaux changements évolutifs d’histoire de vie accompagnant les invasions végétales. Ceux-ci peuvent avoir lieu lors des différentes phases de l’invasion que sont l’introduction, la naturalisation et l’expansion proprement dite. Leur étude s’articule généralement en deux approches : les comparaisons entre populations de l’aire d’indigénat et de l’aire d’invasion d’une part, et d’autre part, les études de la différenciation au sein de l’aire d’invasion. [less ▲]

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See detailLes plantes exotiques envahissantes en Belgique ont-elles des impacts?
Saad, Layla ULg; Jacquemart, Anne-Laure; Cawoy, Valérie et al

in Parcs & Réserves (2009), 64(4), 10-16

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See detailCLANIMAE:Climatic and Anthropogenic Impacts on African Ecosystems. Final Report Phase 1 (2007-2008)
Verschuren, Dirk; Plisnier, Pierre-Denis; Hugues, Harold et al

Report (2009)

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See detailInvasive plant species management tests in Southern Belgium
Delbart, Emmanuel ULg; Halford, Mathieu ULg; Pieret, Nora et al

Poster (2009)

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See detailClinal differentiation during invasion: Senecio inaequidens (Asteraceae) along altitudinal gradients in Europe.
Monty, Arnaud ULg; Mahy, Grégory ULg

Poster (2009)

Plant population differentiation may play a role in decreasing the ability to predict whether, where, and when an introduced species will invade. However, few studies have addressed the level of genetic ... [more ▼]

Plant population differentiation may play a role in decreasing the ability to predict whether, where, and when an introduced species will invade. However, few studies have addressed the level of genetic change an alien species may undergo during range expansion, e.g. in response to climatic variation with altitude. In the present study, we tested the hypothesis that invasive populations of Senecio inaequidens (Asteraceae) differentiated during migration from two independent introduction sites into divergent altitudinal and climatic zones. We carried out two years of common garden experiments with eight populations from a Belgian altitudinal transect and ten populations from similar French transect. Climatic analysis revealed that the Belgian transect followed a temperature and precipitation gradient. A temperature and summer drought gradient characterized the French study site. We evaluated differentiation and clinal variation in the following characters: days to germination, days to flowering, height at maturity, final plant height and aboveground biomass. Results showed that S. inaequidens populations differentiated in growth traits during invasion. First year of experiment, regressing population growth trait means against source population altitude indicated the presence of clinal variation along both transects. Second year, similar results were found along the French transect, i.e. a reduction in height at maturity, plant height and aboveground biomass with increasing altitude. Including seed mass as a covariate did not change the outcome of the analysis. The possible evolutionary causes for the differentiation observed are discussed. [less ▲]

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See detailEditorial : Les invasions biologiques ... appréhender la démesure
Vanderhoeven, Sonia ULg; Branquart, Etienne; Mahy, Grégory ULg

in Parcs & Réserves (2009), 3

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See detailSources of phenotypic variation of life history traits in an invasive species, Senecio inaequidens DC. (Asteraceae)
Monty, Arnaud ULg; Mahy, Grégory ULg

Conference (2009)

The importance of different sources of phenotypic variation, namely adaptation, phenotypic plasticity, environmental maternal effects, ploidy level and genetic drift, were estimated in several life ... [more ▼]

The importance of different sources of phenotypic variation, namely adaptation, phenotypic plasticity, environmental maternal effects, ploidy level and genetic drift, were estimated in several life history traits among populations of an invasive plant species within its invasion range. Several common garden experiments were set out, two of which in a reciprocal transplants experiment. The populations considered in this study were located in Belgium, in France and in the native range of the model species. Senecio inaequidens DC. (Asteraceae) is native to Africa. It was introduced in Europe via wool trade in the late 19th century. In the native range, the species occurs at two co-existing cytotypes: diploid and tetraploid. Only tetraploid individuals are reported in Europe. The particular and well-documented invasion history of S. inaequidens makes it an excellent plant model for evolutionary studies. Several life history traits were measured, related to germination, growth and sexual reproduction. The sources of phenotypic variation in those traits were analysed with respect to climatic variation along altitudinal gradients in the invaded areas. The influence of the ploidy level and the range (native vs introduced) on those traits was also analysed. Results showed that diploid and tetraploid populations differed, mainly in winter survival capacity. Along altitudinal gradients, clinal phenotypic differentiations with a genetic basis were observed among populations. However, environmental maternal effects were found to significantly influence phenotypic variation in areas with harsh climatic conditions. Monty A., Mahy G. 2009. Clinal differentiation during invasion: Senecio inaequidens (Asteraceae) along altitudinal gradients in Europe. Oecologia 159:305–315. Monty A., Lebeau J., Meerts P., Mahy G. 2009. An explicit test for the contribution of environmental maternal effects to rapid clinal differentiation in an invasive plant. Journal of Evolutionary Biology22: 917-936 [less ▲]

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See detailEvolutionary potential of the Fallopia spp. complex in Europe
Vanderhoeven, Sonia ULg; Krebs, Christine; Schaffner, Urs et al

Conference (2009)

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See detailDette d'extinction dans un hotspot de biodiversité: approches communauté et espèces
Piqueray, Julien ULg; Bisteau, Emmanuelle; Cristofoli, Sara et al

Conference (2009)

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See detailFiche synthétique de gestion: Les Jussies
Delbart, Emmanuel ULg; Mahy, Grégory ULg

Learning material (2009)

Detailed reference viewed: 28 (9 ULg)