References of "Mahy, Grégory"
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See detailFiche descriptive - Les spirées nord-américaines (Spiraea spp.)
Halford, Mathieu ULiege; Frisson, Gwenn ULiege; Delbart, Emmanuel ULiege et al

Learning material (2010)

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See detailFiche synthétique de gestion - Erable jaspé de gris (Acer rufinerve)
Halford, Mathieu ULiege; Frisson, Gwenn ULiege; Delbart, Emmanuel ULiege et al

Learning material (2010)

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See detailFiche descriptive - Erable jaspé de gris (Acer rufinerve)
Halford, Mathieu ULiege; Frisson, Gwenn ULiege; Delbart, Emmanuel ULiege et al

Learning material (2010)

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See detailPhenotypic traits variation among native diploid, native tetraploid and invasive tetraploid Senecio inaequidens DC. (Asteraceae)
Monty, Arnaud ULiege; Maurice, Sandrine; Mahy, Grégory ULiege

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010), 14(4), 627-632

Senecio inaequidens DC. is a rapidly spreading plant invader in Europe. In its native range, it occurs at two co-existing diploid and tetraploid cytotypes. To date, only tetraploids are reported in Europe ... [more ▼]

Senecio inaequidens DC. is a rapidly spreading plant invader in Europe. In its native range, it occurs at two co-existing diploid and tetraploid cytotypes. To date, only tetraploids are reported in Europe, even though invasive diploids were recorded in other parts of the world. We compared native diploid and both native and invasive tetraploid populations in common gardens in Europe for a suite of life history traits. Diploids were able to develop, showed high biomass production and produced more flower heads than tetraploids. In contrast, winter survival was null for diploids. It was low for native tetraploids, but reached 40% in invasive tetraploids. Results suggested that diploid cytotype tends to an annual life form when grown in Western Europe, with earlier and more abundant flowering. In contrast, the tetraploid cytotype was mainly perennial which may enhance its invasiveness. [less ▲]

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See detailEvolution of dispersal traits along an invasion route in the wind-dispersed Senecio inaequidens (Asteraceae)
Monty, Arnaud ULiege; Mahy, Grégory ULiege

in Oikos (2010), 119

In introduced organisms, dispersal propensity is expected to increase during range expansion. This prediction is based on the assumption that phenotypic plasticity is low compared to genetic diversity ... [more ▼]

In introduced organisms, dispersal propensity is expected to increase during range expansion. This prediction is based on the assumption that phenotypic plasticity is low compared to genetic diversity, and an increase in dispersal can be counteracted by the Allee effect. Empirical evidence in support of these hypotheses is however lacking. The present study tested for evidence of differentiation in dispersal-related traits and the Allee effect in the wind-dispersed invasive Senecio inaequidens (Asteraceae). We collected capitula from individuals in ten field populations, along an invasion route including the original introduction site in southern France. In addition, we conducted a common garden experiment from field-collected seeds and obtained capitula from individuals representing the same ten field populations. We analysed phenotypic variation in dispersal traits between field and common garden environments as a function of the distance between populations and the introduction site. Our results revealed low levels of phenotypic differentiation among populations. However, significant clinal variation in dispersal traits was demonstrated in common garden plants representing the invasion route. In field populations, similar trends in dispersal-related traits and evidence of an Allee effect were not detected. In part, our results supported expectations of increased dispersal capacity with range expansion, and emphasized the contribution of phenotypic plasticity under natural conditions. [less ▲]

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See detailRestauration écologique: contexte, contraintes et indicateurs de suivi
Cristofoli, Sara ULiege; Mahy, Grégory ULiege

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010), 14(1), 203-211

Dans un contexte global de perturbations anthropiques toujours croissantes des écosystèmes naturels et semi-naturels, l’unique conservation de ces écosystèmes ne suffit plus. La restauration écologique ... [more ▼]

Dans un contexte global de perturbations anthropiques toujours croissantes des écosystèmes naturels et semi-naturels, l’unique conservation de ces écosystèmes ne suffit plus. La restauration écologique peut ainsi se révéler un complément essentiel à la conservation s.l. L’article consiste en une synthèse de la littérature scientifique dédiée aux concepts de la restauration écologique. Nous abordons la notion d’objectifs de la restauration notamment au travers de la référence écologique. Outre la définition d’objectifs clairs de restauration, la référence permet ensuite d’évaluer les efforts de restauration, par le biais d’indicateurs de suivi. Les indicateurs peuvent par ailleurs fournir des informations quant aux attributs de l’écosystème restauré et/ou la trajectoire écologique empruntée. Les éventuelles contraintes rencontrées par les espèces au travers de filtres à la restauration pourront être détectées et des mesures de compensation adéquates pourront être proposées. [less ▲]

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See detailMucilage and polysaccharides in the halophyte plant species Kosteletzkya virginica : Localozation and composition in relation to salt stress
Ghanem, Michel Edmond; Han, Rui-Ming; Classen, Birgit et al

in Journal of Plant Physiology (2010), 167

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See detailSpider communities as evaluation tools for wet heathland restoration
Cristofoli, Sara ULiege; Mahy, Grégory ULiege; Kekenbosh, Robert et al

in Ecological Indicators (2010), 10

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See detailColonisation credit in recent wet heathland butterfly communities
Cristofoli, Sara ULiege; Mahy, Grégory ULiege

in Insect Conservation and Diversity (2010), 3

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See detailAgriculture et Biodiversité
Hance, Thierry; Demeter, Sébastien; Le Roi, Alain et al

Book published by Direction Générale de Opérationnelle des l'Agriculture, des Ressources Naturelles et de l'Environnement (2010)

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See detailRevue bibliographique sur la restauration des pelouses calcicoles en Europe : contraintes rencontrées et solutions proposées
Piqueray, Julien ULiege; Mahy, Grégory ULiege

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010), 14(3), 471-484

Calcareous grasslands, that are considered as biodiversity hotspots in Europe, have suffered an important decline during the last century. In this context, restoration of suitable habitats has been ... [more ▼]

Calcareous grasslands, that are considered as biodiversity hotspots in Europe, have suffered an important decline during the last century. In this context, restoration of suitable habitats has been promoted as a conservation strategy. Restoration consists in the recreation of favourable abiotic and biotic conditions that permit the recolonization by typical species. Depending on the degradations, several constraints can be encountered during restoration, such as soil enrichment, the presence of competitive species, or harsh conditions for plant growth. In order to overcome these constraints, scientists have proposed techniques that were demonstrated to be more or less efficient. In this article, the different constraints that can occur while restoring calcareous grasslands are described as well as the techniques proposed in the scientific literature. We also describe restoration objectives specific to calcareous grasslands, taking the history of these habitats into account and considering global change issue. Different parameters can be considered to value restoration success. Here again, an analysis of the scientific literature is needed in order to best assess restoration monitoring. [less ▲]

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