La végétation aquatique des cours d'eau de Lorraine : typologie floristique et écologique : contribution à l'étude de l'autoécologie des espèces de la flore aquatique lorraine

Abstract : The knowledge of aquatic vegetation and its environmental parameters appears essential in comprehension of macrophyte proliferations occuring more and more frequently in streams and producing many inconveniences. As part of elaboration of a method to describe and organize abiotic parameters in river ecosystem, a typology built on aquatic vegetation was considered. Twenty-one streams were examined, as a sampling, all being located on watershed's head and representing the geological diversity of the Lorraine area. The study sites were chosen in relation to abiotic cut-off points defined by zones of sreams, homogeneous in terms of their geology, gradient and size. A qualitative inventory of aquatic macrophytes was realized and species was listed according to quantitative criteria (cover percentages). The environmental parameters study includes morphometric surveys, chemical analyses and luminosity measures on the water surface. Four major types of streams were determined through this analysis : on granite, sandstone, limestone and marl. The relevance of using geology as first hierarchical criterion to classify streams was confirmed. Some typical vegetation successions have been observed with qualitative and quantitative variations in function of their position from source to river moth. These successions were compared to those existing in other lands and countries. Multivariate analyses and hierarchical ascending classifications have brought to the fore the correlations of chemical, morphometrical and environmental parameters with vegetation species. Ecological profiles study confirmed these results. This thesis forms the basis for a typology of Lorraine's streams, using the aquatic vegetation. It enables to increase knowledge of macrophyte vegetation in Lorraine, to test a method of rivers characterization according to aquatic vegetation and to deepen the bioindication concept by aquatic vegetation
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Nathalie Grasmuck. La végétation aquatique des cours d'eau de Lorraine : typologie floristique et écologique : contribution à l'étude de l'autoécologie des espèces de la flore aquatique lorraine. Sciences agricoles. Université Paul Verlaine - Metz, 1994. Français. ⟨NNT : 1994METZ071S⟩. ⟨tel-01777155⟩

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