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Nutrient Retention Efficiency in Streams Receiving Inputs from Wastewater Treatment Plants

^a Laboratori d'Enginyeria Química i Ambiental, Facultat de Ciències, Universitat de Girona, Campus Montilivi, s/n, 17071 Girona, Spain
^b Agència Catalana de l'Aigua, Departament de Medi Ambient, Generalitat de Catalunya, Provença 204-208, 08036 Barcelona, Spain
^c Departament d'Ecologia, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
^d Centre d'Estudis Avançats de Blanes (CSIC), Accés a la Cala St. Francesc 14, 17300 Blanes, Girona, Spain

View larger version (24K): [in a new window]   Fig. 1. Location of study sites within the Catalonian region (40°30'–42°30' N and 0°15'–3° 15' E).

View larger version (21K): [in a new window]   Fig. 2. Relationship between stream discharge and (a) phosphate–phosphorus uptake length, (b) ammonium-N uptake length, and (c) nitrate-N uptake length in streams located in nonpolluted areas (open circles) and in polluted streams (solid circles). Figures (a) and (b) are modified from Butturini and Sabater (1998) for nonpolluted streams, and expanded with data from this study for polluted streams and data from Davis and Minshall (1999) for nonpolluted streams. Data for polluted streams in figure (c) are from this study, and data for nonpolluted streams are from the following studies: Munn and Meyer (1990), Webster et al. (1991), Wallace et al. (1995), Marti and Sabater (1996), Valett et al. (1996), Marti et al. (1997), and Davis and Minshall (1999).