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
biologie des populations, projets de recherche |
• Tous les projets de recherche en biologie des populations Abstract The biological diversity of montane regions may be threatened by predicted climate change. Low mountain species frequently cannot respond to climate change by migrating upward, but only by plasticity or genetic adaptation. Predicted climate change will not only result in changed environmental conditions, but.. Lire la suite
biologie des populations, projets de recherche, sciences de la vie |
Example from the genus Saxifraga studied with phylogenetic and phylogeographic approaches. Abstract This research project focuses on the forces that shape patterns of molecular genetic variation in plants. These can be historical factors (e.g. climate fluctuations) or genomic modifications like polyploidization events or hybridization between different species. A multidisciplinary approach combining statistical phylogeography and species.. Lire la suite
biologie des populations, botanique, projets de recherche, sciences de la vie |
Scorzonera humilis est une plante pérenne, caractéristique des prairies et landes humides peu amendées. Autrefois l’espèce était assez répandue mais elle est devenue beaucoup plus rare durant les dernières décennies. Actuellement elle est menacée dans une grande partie de l’Europe.
biologie des populations, botanique, projets de recherche, sciences de la vie |
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.
biologie des populations, botanique, projets de recherche, sciences de la vie |
Abstract 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.. Lire la suite
biologie des populations, botanique, projets de recherche, sciences de la vie |
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.
biologie des populations, botanique, projets de recherche, sciences de la vie |
Abstract Accurate information about population levels of badgers is important in monitoring the impact of human pressure on badger numbers and assessing the conservation status of the population. However, at present there is no reliable and cost-effective badger census technique. The project aims to develop a hair collection protocol for the estimation of badger social.. Lire la suite
biologie des populations, projets de recherche, sciences de la vie, zoologie des vertébrés |
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
biologie des populations, botanique, collection des plantes vivantes, projets de recherche, sciences de la vie |
