Articles | Volume 16, issue 6
Biogeosciences, 16, 1361–1380, 2019
Biogeosciences, 16, 1361–1380, 2019
Research article
02 Apr 2019
Research article | 02 Apr 2019

Reduced phosphorus loads from the Loire and Vilaine rivers were accompanied by increasing eutrophication in the Vilaine Bay (south Brittany, France)

Widya Ratmaya et al.

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Cited articles

91/271/EEC: Directive 91/271/EEC concerning urban waste-water treatment, Official Journal L, 135, 40–52, 1991. 
91/676/EEC: Directive 91/676/EEC concerning the protection of waters against pollution caused by nitrates from agricultural sources, Official Journal L, 375, 1–8, 1991. 
Abril, G., Riou, S. A., Etcheber, H., Frankignoulle, M., de Wit, R., and Middelburg, J. J.: Transient, tidal time-scale, nitrogen transformations in an estuarine turbidity maximum – fluid mud system (The Gironde, South-west France), Estuar. Coast. Shelf S., 50, 703–715,, 2000. 
Aquilina, L., Vergnaud-Ayraud, V., Labasque, T., Bour, O., Molenat, J., Ruiz, L., de Montety, V., De Ridder, J., Roques, C., and Longuevergne, L.: Nitrate dynamics in agricultural catchments deduced from groundwater dating and long-term nitrate monitoring in surface- and groundwaters, Sci. Total Environ., 435–436, 167–178,, 2012. 
Belin, C. and Neaud-Masson, N.: Cahier de Procédures REPHY, Document de prescription, Version 1, 61 pp., Ifremer, Nantes, France, 2017 (in French). 
Short summary
This work reports the consequences of nutrient management strategy, an example from southwestern Europe focused mainly on P reduction. Upstream rivers reveal indices of recoveries following the significant diminution of P, while eutrophication continues to increase downstream, especially when N is the limiting factor. This long-term ecosystem-scale analysis provides more arguments for a dual-nutrient (N and P) management strategy to mitigate eutrophication along the freshwater–marine continuum.
Final-revised paper