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Five-year study of consequences of fluvial maintenance operations on the biodiversity in the Mareau-aux-Prés islands (National Reserve of Saint-Mesmin, Loire River, France)

Abstract : The Mareau-aux-Prés islands, along the Loire river, are characterized by a multiple channel pattern, where natural limestone riffles influence the morphology and spatial distribution of vegetated islands, secondary channels and alluvial bars. In September 2012, within these islands, the vegetation of the central 3 ha sandy-gravelly bar was uprooted and the bar level lowered in order to maintain the flow capacity of the river. A new sandy-gravelly bar appeared in spring 2013, ideal field support to study long-term ecological issues. A multidisciplinary research programme (‘BioMareau’ project) is currently being conducted from 2012 to 2019, focusing on physical and biological compartments. Field measurements on annual basis were performed on hydrosedimentary processes. Biotic components focus on colonization dynamics by Populus nigra seedlings (studying small-scale DNA spatial genetic structure and through plot survey), by native and invasive flora (through seed bank and summer inventories), by community assemblages of ground beetles Coleoptera Carabidae, by gravel nesting birds and on the consequence of the modification of the feeding habitat by the European beaver (as the island constituted the main source of wood). We will present 5 years of results after fluvial maintenance operations. The applied objectives of such study are to guide river managers in order to perform optimal useful management operations with a minimum loss of biodiversity.
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  • HAL Id : hal-02736217, version 1
  • PRODINRA : 479569

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Marc Villar, Sylvie Augustin, Michel Chantereau, Michel Chevalier, Olivier Denux, et al.. Five-year study of consequences of fluvial maintenance operations on the biodiversity in the Mareau-aux-Prés islands (National Reserve of Saint-Mesmin, Loire River, France). 3. conférence internationale I.S Rivers. Recherches et actions au service des fleuves et grandes rivières. Integrative sciences and sustainable development of rivers, Jun 2018, Lyon, France. 2018, Recherches et actions au service des fleuves et grandes rivières. Integrative sciences and sustainable development of rivers. Programme et résumés. Programme and abstacts. ⟨hal-02736217⟩

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