References of "Graitson, Eric"
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See detailLa Salamandre tachetée Salamandra salamandra (Linnaeus, 1758)
de Wavrin, Hellin; Graitson, Eric ULg

in Jacob, Jean-Paul; Percsy, Christiane; de Wavrin, Hellin (Eds.) et al Amphibiens et Reptiles de Wallonie (2007)

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See detailLa Vipère péliade Vipera berus (Linnaeus, 1758)
Paquay, Marc; Graitson, Eric ULg

in Jacob, Jean-Paul; Perscy, Christiane; de Wavrin, Hellin (Eds.) et al Amphibiens et Reptiles de Wallonie (2007)

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See detailLe Lézard vivipare Zootoca vivipara (Jacquin, 1758)
Graitson, Eric ULg

in Jacob, Jean-Paul; Percsy, Christiane; de Wavrin, Hellin (Eds.) et al Amphibiens et Reptiles de Wallonie (2007)

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See detailL'orvet fragile Anguis fragilis (Linnaeus ,1758)
Graitson, Eric ULg

in Jacob, Jean-Paul; Percsy, Christiane; de Wavrin, Hellin (Eds.) et al Amphibiens et Reptiles de Wallonie (2007)

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See detailLa couleuvre à collier Natrix natrix (Linnaeus, 1758)
Graitson, Eric ULg

in Jacob, Jean-Paul; Percsy, Christiane; de Wavrin, Hellin (Eds.) et al Amphibiens et Reptiles de Wallonie (2007)

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See detailLa Coronelle lisse Coronella austriaca (Laurenti, 1768)
Graitson, Eric ULg; Jacob, Jean-Paul

in Jacob, Jean-Paul; Percsy, Christiane; de Wavrin, Hellin (Eds.) et al Amphibiens et Reptiles de Wallonie (2007)

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See detailLe lézard des murailles Podarcis muralis (laurenti, 1768)
Graitson, Eric ULg; Jacob, Jean-Paul

in Jacob, Jean-Paul; Percsy, Christiane; de Wavrin, Hellin (Eds.) et al Amphibiens et Reptiles de Wallonie (2007)

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See detailLe Crapaud calamite, Bufo calamita Laurenti, 1768
Graitson, Eric ULg; Denoël, Mathieu ULg

in Jacob, Jean-Paul; Percsy, Christiane; de Wavrin, Hellin (Eds.) et al Amphibiens et Reptiles de Wallonie (2007)

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See detailL’évolution du peuplement herpétologique en Région wallonne (Belgique)
Jacob, Jean-Paul; Percsy, Christiane; De Wavrin, Hellin et al

Conference (2007)

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See detailL'herpétofaune des bords de route en Wallonie: analyse de 101 stations
Graitson, Eric ULg

in Naturalistes Belges (Les) (2006), 87(3), 73-80

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See detailInventaire et caractérisation des sites calaminaires en Région Wallonne
Graitson, Eric ULg

in Natura Mosana (2006), vol.58, n° 4(1), 83-124

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See detailRépartition et écologie des reptiles sur le réseau ferroviaire en Wallonie
Graitson, Eric ULg

in Bulletin de la Société Herpétologique de France (2006), 120

In Wallonia, railways constitute valuable habitats for reptile conservation. All autochthonous species have colonized these man-made habitats, but their presence and abundance largely vary among the ... [more ▼]

In Wallonia, railways constitute valuable habitats for reptile conservation. All autochthonous species have colonized these man-made habitats, but their presence and abundance largely vary among the natural regions and the kinds of railways. Reptiles are more frequent along railways with remaining rails than along dismounted unused ways, which represents one half of the network. Although representing only a small part of the network, the unused railways not dismounted are particularly rich in reptiles. This is also the case of some active lines in sunny areas of large valleys and in some large switchyards. Anguis fragilis is the most widespread species on the Walloon railways, but P o d a rcis muralisis the most abundant. In Wallonia, railways seemed to have contributed to the local, more rarely regional, dispersion of at least five species of reptiles: Anguis fragilis, Lacerta agilis, Podarcis muralis, Zootoca viviparaa and Coronella austriaca. Some of these species – specifically Podarcis muralis– have most probably colonized new regions through unexpected transportation by merchandise cars. Finally, reptile populations inhabiting the Walloon railways face several threads. [less ▲]

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See detailMise en oeuvre du réseau Natura 2000 en Wallonie: Finalisation de la typologie WALEUNIS et synthèse des états de conservation, critères de restauration et mesures de gestion pour les milieux rocheux et pelouses calaminaires
Graitson, Eric ULg; Rouxhet, Serge ULg; Guillitte, Olivier ULg

Report (2005)

Résumé exécutif - Le premier volet de ce programme de travail a été consacré à la finalisation de la typologie WALEUNIS ainsi qu'en l'alimentation d'une base de données phytosociologiques pour ces milieux ... [more ▼]

Résumé exécutif - Le premier volet de ce programme de travail a été consacré à la finalisation de la typologie WALEUNIS ainsi qu'en l'alimentation d'une base de données phytosociologiques pour ces milieux. Il ressort de cette première partie que les données relatives aux milieux rocheux sont peu nombreuses en Région wallonne contrairement aux pelouses calaminaires pour lesquelles les travaux scientifiques sont abondants. Les principales modifications ont porté sur la typologie des milieux rocheux. Un second volet a consisté en l'établissement d'une méthode objective d'évaluation de l'état de conservation, en la proposition de critères pour la restauration de ces habitats et en une synthèse des mesures de gestion. Cette étude a permis de mettre en évidence que les critères utiles à l'évaluation de l'état des pelouses calaminaires et des milieux rocheux sont moins nombreux que pour les autres types d'habitats naturels présents en région wallonne, principalement en raison de la stabilité de leur végétation. Les critères proposés pour l'évaluation de l'état de conservation appartiennent à trois catégories: structure spatiale, structure et fonctionnement de l'écosystème, perturbations anthropiques. L'évaluation de la représentativité de l'habitat (sur base de la présence des espèces végétales typiques) doit permettre de dégager des priorités en matière de restauration de ces milieux. Les mesures de gestion (habituellement légères) et de restauration (qui peuvent être plus conséquentes) à mettre en œuvre dans ces habitats doivent prendre en compte leur origine. Les données récoltées au cours de cette étude ont été utiles à la réalisation de cahiers d'habitats pour les pelouses calaminaires et les milieux rocheux. [less ▲]

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See detailLes abris artificiels: un outil pour les inventaires herpétologiques et le suivi des populations de reptiles
Graitson, Eric ULg; Naulleau, Guy

in Bulletin de la Société Herpétologique de France (2005), 115

We present a bibliographic review on the use of artificial shelters to obtain herpetological species check-lists in Western Europe. The methodologies in the different studies are compared. Three different ... [more ▼]

We present a bibliographic review on the use of artificial shelters to obtain herpetological species check-lists in Western Europe. The methodologies in the different studies are compared. Three different kinds of listing are distinguished: qualitative, semi-qualitative, and quantitative. Comparisons across studies show that the use of shelter-plates highly favours the detection of at least five species (Anguis fragilis, Coluber viridiflavus, Coronella austriaca, Elaphe longissima, and Natrix natrix). Plates also allow the detection of juvenile individuals more reliably than the visual searching method. Shelter use increases with time. More variation was found in the detection of Viperids, Lacertids and some amphibians. For these species, artificial shelter use is useful for qualitative listings but the procedure should be improved for quantitative listings. [less ▲]

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See detailRésultats d'un inventaire des reptiles par la méthode des "Plaques Refuges" en Région Wallonne
Graitson, Eric ULg

in Natura Mosana (2004), 56(4), 73-83

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See detailEcology And Conservation Of Belgian Populations Of Viola Calaminaria, A Metallophyte With A Restricted Geographic Distribution
Bizoux, Jean-Philippe ULg; Brevers, F.; Meerts, P. et al

in Belgian Journal of Botany (2004), 137(1), 91-104

Viola calaminaria (Gingins) Lej. is a rare and threatened species, endemic to metalliferous soils in E Belgium, S Netherlands and W Germany. In order to provide basic information for a conservation ... [more ▼]

Viola calaminaria (Gingins) Lej. is a rare and threatened species, endemic to metalliferous soils in E Belgium, S Netherlands and W Germany. In order to provide basic information for a conservation strategy, we performed an ecogeographic survey of almost all V. calaminaria populations currently existing in Belgium. Twenty-four populations were found, distributed in three geographic groups all in the Province of Liège. The area covered by V. calaminaria ranged from < 1 m2 to 3.2 ha. The largest populations were found in sites contaminated by atmospheric deposits from metal smelters. Soils were extremely variable in heavy metal and nutrient concentrations, but concentrations of Zn, Pb and Cd were consistently higher than reference values for normal soils. V. calaminaria was most often found in association with other metallophyte and pseudometallophyte taxa typical of metalliferous sites. Plant communities identified by TWINSPAN analysis generally fitted the heavy metal associations previously described but two unusual heavy metal plant communities were identified. Based on a canonical correspondence analysis, pH was the only factor that was clearly correlated with the floristic composition of plant communities associated to V. calaminaria. This study confirmed the ecological endemic status of V. calaminaria and the importance of the conservation of metalliferous sites. [less ▲]

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