References of "Mahy, Grégory"
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See detailCopper endemism in the Congolese flora: a database of copper affinity and conservational value of cuprophytes.
Faucon, M. P.; Meerseman, A.; Shuta, A. et al

in Plant Ecology and Evolution (2010), 143

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See detailHistorical landscape structure affects plant species richness in wet heathlands with complex landscape dynamics
Cristofoli, Sara; Monty, Arnaud ULg; Mahy, Grégory ULg

in Landscape & Urban Planning (2010), 98

The spatio-temporal dynamics of wet heathlands from two landscapes in high Ardenne (Belgium), as well as the consequences of such dynamics on plant communities were investigated. Past and present ... [more ▼]

The spatio-temporal dynamics of wet heathlands from two landscapes in high Ardenne (Belgium), as well as the consequences of such dynamics on plant communities were investigated. Past and present destruction and origin of habitat patches have resulted in a complex network of different aged habitat patches. Current specialist and generalist species richness were assessed in 59 patches and analyzed with respect to present and past patch spatial metrics (controlled for habitat quality). Current patch area affected specialist species richness and current patch connectivity influenced both specialist and generalist species richness. Thirteen of the 59 patches were historical patches, i.e. patches that have remained since the 1770s. In these historical patches, including past landscape structure in the analysis explained more of the variability in current species richness than the current landscape structure alone, suggesting the existence of an extinction debt. [less ▲]

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See detailMapping of soil-sediment systems contaminations around a metal-ore smelter. The example of Cu in Lubumbashi (R.D. Congo)
Mpundu, Michel; Kaya Muyumba, Donato ULg; N'gongo, Michel et al

Conference (2009, December 02)

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See detailLes invasions biologiques ... quand Darwin s'en mêle
Vanderhoeven, Sonia ULg; Mahy, Grégory ULg; Vanparys, Valérie et al

in Parcs & Réserves (2009), 64(4), 7-9

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See detailBiodiversity Conservation and Mining : a Study Case of Ecosystem Reconstruction in Katanga (DRC)
Lebrun, Julie ULg; Seleck, Maxime ULg; Semereab, Ezana et al

Conference (2009, September 03)

The South of the Democratic Republic of Congo (Katanga) and adjoining regions in the North of Zambia comprise some of the largest ore bodies of cobalt and copper in the world. Katangan copper hills harbor ... [more ▼]

The South of the Democratic Republic of Congo (Katanga) and adjoining regions in the North of Zambia comprise some of the largest ore bodies of cobalt and copper in the world. Katangan copper hills harbor about 40 endemics as well as particular steppic plant communities. This Biological Diversity Action Plan (BDAP) is an activity program for the conservation of copper-cobalt flora and vegetation and mitigation of potential species extinction risk, during the early construction phase of the Tenke Fungurume Mining Corp. (TFM) project. Six potential taxa of concern (IUCN criteria) have been identified in the TFM concession. In situ conservation is fulfilled through the setting of a single large reserve. In parallel, important efforts have been devoted to ex-situ conservation strategy to re-establish vegetation and species after mining activities cessation. This includes: - Translocation of 3500 individuals of plants of concern to the nature reserve. - Ecosystem engineering with the reconstruction of an artificial copper/cobalt ecosystem. - Ex-situ seed bank with 300 seed samples (at least 50 seeds) collected belonging to 40 species and used for short and long term conservation, germination tests and micro-propagation tests. All these efforts represent an important step towards the conservation of copper-cobalt flora. [less ▲]

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See detailBiodiversity Action Plan - Tenke Fungurume Mining - 2007-2009
Mahy, Grégory ULg; Weiskopf, Tom; Malaisse, François ULg et al

Report (2009)

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See detailMéthodes de gestion des principales plantes invasives en zones humides - 4 ème partie
Delbart, Emmanuel ULg; Pieret, Nora; Vanderhoeven, SONIA ULg et al

in Silva Belgica (2009)

Detailed reference viewed: 105 (16 ULg)
See detailLes mesures agri-environnementales en région wallonne (Belgique) et plus particulièrement le cas des messicoles.
Legast, Marie ULg; Mahy, Grégory ULg

Conference given outside the academic context (2009)

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See detailEvaluation appropriée des incidences sur Natura 2000 : Projet de RAVeL sur la ligne 98a : Commune des Honnelles : Rapport final
Taymans, Julien ULg; Mahy, Grégory ULg

Report (2009)

La présente évaluation spécifique des incidences du projet est exigée par le Département Nature et Forêts (DNF) de la Région wallonne en application de la directive européenne 92/43/CEE relative à la ... [more ▼]

La présente évaluation spécifique des incidences du projet est exigée par le Département Nature et Forêts (DNF) de la Région wallonne en application de la directive européenne 92/43/CEE relative à la conservation des sites Natura 2000 ainsi que de la faune et de la flore sauvages (« directive habitats »). Elle concerne l’évaluation appropriée des incidences du projet sur le site Natura 2000 « Haut-Pays des Honnelles » (site BE32025). Le projet prévoit l’établissement d’un RAVeL sur la ligne de chemin de fer désaffectée 98a, qui traverse le site Natura 2000 sur la Commune des Honnelles. [less ▲]

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See detailContamination des sols par les activités minières à Lubumbashi (RDC). Incidences en matière de diagnostic et de choix de solutions de gestion.
Mpundu Mubemba, Michel; Ngoy Shutcha, Mylor; Faucon, Michel-Pierre et al

in Schwartz, Dominique (Ed.) Actes des 10emes JES (2009, May)

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See detailPlant species extinction debt in a biodiversity hotspot: community and species approaches
Piqueray, Julien ULg; Bisteau, Emmanuelle; Cristofoli, Sara et al

Conference (2009, April)

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See detailEnvironmental Controls on the Distribution of Aquatic Macrophytes in Ugandan Crater-lakes
Lebrun, Julie ULg; Mahy, Grégory ULg

Poster (2009, March 27)

This research is part of an integrated paleoecological project which aims at coupling reconstructions of past vegetation and water-quality changes with climate variability. Crater-lakes from East Africa ... [more ▼]

This research is part of an integrated paleoecological project which aims at coupling reconstructions of past vegetation and water-quality changes with climate variability. Crater-lakes from East Africa are favourable to the conservation of proxy indicators such as plant macrofossils used to reconstruct the lake ecosystem. The study of modern macrophytic communities related to present environmental parameters was the first step of this research. Phytosociologic and environmental data were collected in 36 crater-lakes in South-western Uganda. Species abundance and habitat conditions were described in 216 relevés arranged along transects from the lakeshore to the depth limit of aquatic plant development. A cluster analysis identified 8 macrophytes communities and their indicator species were highlighted. Combining two levels of analysis (lake or relevé) with different kind of ordinations (CA and CCA), main parameters explaining community variability were conductivity, pH, Human Impact index, vegetation zonation and productivity (Chlorophyll-a and total nitrogen). Multiple species response curves to environmental parameters were performed to assess the ecological amplitude at the individual level and select species with a good proxy-indicator value. These results give some trends about the ecology of macrophytes communities and the ecological significations of macrofossils. [less ▲]

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See detailAn explicit test for the contribution of environmental maternal effects to rapid clinal differentiation in an invasive plant
Monty, Arnaud ULg; Lebeau, Julie; Meerts, Pierre et al

in Journal of Evolutionary Biology (2009), 22(5), 917-926

Population differentiation of alien invasive plants within their non-native range has received increasingly more attention. Common gardens are typically used to assess the levels of genotypic ... [more ▼]

Population differentiation of alien invasive plants within their non-native range has received increasingly more attention. Common gardens are typically used to assess the levels of genotypic differentiation among populations. However, in such experiments, environmental maternal effects can influence phenotypic variation among individuals if seed sources are collected from field populations under variable environmental regimes. In the present study, we investigated the causes of an altitudinal cline in an invasive plant. Seeds were collected from Senecio inaequidens (Asteraceae) populations along an altitudinal gradient in southern France. In addition, seeds from the same populations were generated by intra-population crossings in a climatic chamber. The two seed lots were grown in a common garden in Central Belgium to identify any evidence of environmentally induced maternal effects and/or an altitudinal cline in a suite of life-history traits. Results failed to detect any environmental maternal effects. However, an altitudinal cline in plant height and above-ground biomass was found to be independent of the maternal environment. [less ▲]

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

in Oecologia (2009), 159(2), 305-315

The dynamics of plant population differentiation may be integral in predicting aspects of introduced species invasion. In the present study, we tested the hypothesis that European populations of Senecio ... [more ▼]

The dynamics of plant population differentiation may be integral in predicting aspects of introduced species invasion. In the present study, we tested the hypothesis that European populations of Senecio inaequidens (Asteraceae), an invasive species with South African origins, differentiated during migration from two independent introduction sites into divergent altitudinal and climatic zones. We carried out 2 years of common garden experiments with eight populations sampled from Belgian and ten populations from French altitudinal transects. The Belgian transect followed a temperature and precipitation gradient. A temperature and summer drought gradient characterized the French transect. We evaluated differentiation and clinal variation in plants germinated from field-collected seed using the following traits: 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. During the 1st year of sampling, the results indicated clinal variation for growth traits along both the Belgium and French altitudinal transects. Data from the 2nd year of study demonstrated that with increasing altitude, a reduction in three growth traits, including plant height at maturity, final plant height and aboveground biomass, was detected along the French transect, but no longer along the Belgian one. Phenological traits did not exhibit a clear clinal variation along altitudinal transects. The possible evolutionary causes for the observed differentiation are discussed. [less ▲]

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See detailMéthodes de gestion des principales plantes invasives en zones humides - 3 ème partie
pieret, Nora; Delbart, Emmanuel ULg; Vanderhoeven, SONIA ULg et al

in Silva Belgica (2009)

Detailed reference viewed: 45 (6 ULg)