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Updated: Jul 19, 2026

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
Published on: September 26, 2017
[Temporal variations of physicochemical and microbiological parameters in three freshwater ecosystems (southeastern
Sophie Dandelot1, Robert Matheron, Jean Le Petit
1Institut Méditerranéen d'Ecologie et de Paléoécologie, UMR 6116, Faculté des Sciences et Techniques de Saint-Jérôme, Université Paul-Cézanne, 13397 Marseille cedex 20, France. sophie.dandelot@netcourrier.com
Abstract:
In France, two amphibious hydrophytes of alien Ludwigia (Onagraceae) have for about the past twenty years been causing serious ecological and economic problems: L. peploides (Kunth) Raven et L. grandiflora (Michaux) Greuter & Burdet. This bacteriological and physicochemical study, focused on three different Mediterranean aquatic ecosystems, reveals, for the first time, a direct negative impact of these American invaders. During summer, while plant growth is intensive, and the appearance in the water column of anoxic conditions and production of toxic compounds may be observed, notably in L. grandiflora stands. The toxicity is linked to a proliferation of sulphate-reducing bacteria producing sulphides that are very harmful for aquatic organisms.
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