Tim Sierens

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Ceratophyllum spp., Callitriche spp., Zannichellia spp. and Potamogeton pectinatus L. are widespread submerged macrophyte species, often occurring at high abundance and forming an integral part of the vegetation of many types of shallow aquatic systems. Several species occur in both freshwater and brackish water habitats. Most have a mixed reproduction(More)
Understanding how landscape structure shapes the genetic structure of populations of keystone species is important for their long-term management. We tested the unidirectional dispersal hypothesis on the linear river landscape of the Wouri River and the one catchment-one gene pool hypothesis on red mangrove (Rhizophora racemosa) populations of the Cameroon(More)
Many aquatic plant and seagrass species are widespread and the origin of their continent-wide ranges might result from high gene flow levels. The response of species when extending northwards since the Last Glacial Maximum can be opposed to the structuring of their populations that survived glaciation cycles in southern regions. The peri-Mediterranean is a(More)
Saline inland and coastal waterbodies are valuable habitats that deserve attention for the protection of their unique submerged macrophyte beds that render the water clear, stabilize sediments and provide a habitat for high biomasses of invertebrates as food for waterfowl. The ‘continental seagrass’ Ruppia has the widest salinity tolerance among the(More)
Primula vulgaris is a perennial herb from moist native forest vegetation. In western European lowlands, it has become rare, still declining and occurring in forest remnants embedded within an agricultural matrix. In Belgium and The Netherlands, it received special attention for conservation. We developed 12 novel polymorphic microsatellite loci and two(More)
Papyrus in tropical swamps regenerate vegetatively and through seeds. The study investigated clonal diversity of Cyperus papyrus bordering Lake Naivasha (Kenya). Three regions within the lake were investigated aiming to detect fine-scaled structure in a lakeward transect, including two sites subject to recent dynamic changes, namely a seedling zone and a(More)
In 2006 a test rig was built by Ghent University to measure patellofemoral pressures. The main goal of the current study is to improve and upgrade the Ghent Knee Rig (GKR). The improvement consists of a better approach of the Q angle. The mechanical connection between the linear actuator and the rectus femoris tendon represents the force of the quadriceps.(More)
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