Consequences of ploidy level on the reproductive isolation, ecological niche differentiation and plasticity of two subspecies of Saxifraga rosacea

Abstract Despite technological advances at the molecular level, it is still difficult to differentiate two subspecies of closely related taxa. It is often necessary to combine genetic techniques with ecological studies to distinguish each of them. The main purpose of the present project is to assess the importance of ecological niche differentiation that can be.. Lire la suite

population biology, research projects |

Biologie des populations de la plante menacée Scorzonera humilis

Responsable de projet: Guy Colling (Service Biologie des Populations, Musée national d’histoire naturelle, Luxembourg ; Universität Zürich, Institut für Umweltwissenschaften )). Collaborateurs: Diethart Matthies (Department of Biology, Plant Ecology, University of Marburg), Claude Reckinger (Collaborateur scientifique du Musée national d’histoire naturelle). Scorzonera humilis est une plante pérenne, caractéristique des prairies et landes humides peu amendées... Lire la suite

botany, life sciences, population biology, research projects |

Effet de la fragmentation des habitats sur des espèces végétales du genre Saxifraga et du genre Lychnis

Nous étudions deux couples d’espèces végétales des genres Saxifraga et Lychnis, dont l’une habite les prairies mésophiles et l’autre les pentes rocheuses siliceuses, deux habitats protégés au niveau européen. Les pentes rocheuses sont fragmentées de par leur nature alors que les prairies mésophiles, jadis répandues, ont diminués à cause de l’intensification de l’agriculture.

botany, life sciences, population biology, research projects |

Population biology of endangered plant species in newly available habitats

Habitat fragmentation and habitat deterioration are considered to be the major reasons for the decline in the number of populations of many plant species, which are now often threatened with local extinction. Today, nutrient-poor calcareous grasslands are among the most threatened habitat types and often exist only as remnant islands in a matrix of unsuitable environment.

botany, life sciences, population biology, research projects |

Mountain areas and their importance for the conservation of plant diversity in Central European grasslands

Many formerly common plant species of nutrient-poor grasslands have strongly declined in Europe in the last decades due to changes in land use practices and the use of mineral fertilizers, resulting in the destruction and fragmentation of these grasslands. In mountain areas the intensification of land use practices has only recently begun and many grasslands are still nutrient-poor and traditionally managed.

botany, life sciences, population biology, research projects |

Genetic diversity and population structure of Juniperus communis L. in Luxembourg. Is the conservation of small fragmented populations a priority?

Juniperus communis L. is a dioecious wind-pollinated gymnosperm, native for Luxembourg where its distribution is limited on sandstone and keuper marl. The shrub appears only in the centre of Luxembourg, knowing a south-west to north-east distribution. In the last decades its occurrence has declined from 27 to 21 populations, which seems rather low, but only.. Lire la suite

botany, life sciences, Living plants collections, population biology, research projects |