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Défense de thèse de doctorat en sciences biologiques "quagga mussel"

Invasion of Western Europe by the quagga mussel : Phylogeography, population genetics and potential impact assessment

Catégorie : défense de thèse
Date : 10/12/2014 15:00 - 10/12/2014 17:00
Lieu : Auditoire L12, rue Grafé, 1, 5000 Namur
Orateur(s) : Jonathan MARESCAUX
Organisateur(s) : Karine VAN DONINCK

Jean-Nicolas BEISEL (ENGEES), Thierry HANCE (UCL), Eric DEPIEREUX, président (UNamur), Jean-Pierre DESCY (UNamur), Lise-Marie PIGNEUR (UNamur), Karine VAN DONINCK, promoteur (UNamur)



Biofouling invaders constitute one of the major threats to freshwater biodiversity not only because they have an impact on both aquatic ecosystems and biodiversity but also because they negatively influence industrial activities. The best-known example is the invasion of Western Europe and North America by the zebra mussel (Dreissena polymorpha, Pallas 1771). In the meantime, a second dreissenid species, the quagga mussel (Dreissena rostriformis bugensis, Andrusov 1897) recently became invasive in both the Old and New World with a first observation in Western Europe in 2006.

Although the spread of the quagga mussel into Western Europe is still in its infancy, place and time of first records and subsequent spread of the species is well described. But the invasion pathways and the ecology of the species, which are crucial to estimate potential impacts and to develop effective management strategies, are only poorly documented, especially in Western Europe. Therefore, an integrative approach combining phylogeography, population genetics and ecology was chosen to fill the gaps in the present knowledge on the Western European invasion by the quagga mussel. This Ph.D. project addresses the following questions:

- Within the genus Dreissena, did the quagga mussel invade the Meuse River and since when?

- What were the colonization pathways of the quagga mussel in Western Europe?

- What are the impacts of invasive bivalves on the phytoplankton community of European rivers?

- What are the population dynamics of the Dreissena species in the Meuse River and their relationships with other benthic macro-invertebrates?

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