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We studied the effect of point-source and non-point-source pollution on the retention capacity of\udthe stream and its link with the metabolic state (primary production and respiration) and invertebrates assemblages\udin a third order Mediterranean stream. Two experimental sites were chosen: one in the upper part of\udthe catchment (Monte´gut site) characterized by low concentrations in nitrate and phosphate and one in the\udlower part of the catchment (Le´zat site) characterized by high nitrate and phosphorus concentrations. Both\udexperimental sites were located on reaches that included a Waste Water Treatment Plant (WWTP) point\udnutrient source allowing discussion of the relative effects of point-source and non-point-source nutrients\udloads on ecosystem function (respiration and uptake rates) and aquatic organism assemblages. NH4\ud+-N, and\udPO43x-P uptake rates were determined using solute additions conducted at constant rates (short-term nutrient\udaddition procedure) and NO3\udx-N uptake rates were determined using instantaneous solute addition (slug\udaddition procedure). Rates of gross primary production (GPP) and ecosystem respiration were determined\udusing the open system, two-stations diurnal oxygen change method. Benthic invertebrate communities were\udinvestigated for species and functional feeding groups diversities measurements. Results show that autotrophy\udin the river results from nutrients of two distinct origins: point sources for phosphorus (urban area and\udWWTP) and non-point sources for nitrogen (agricultural zones) with local additions from WWTP inputs.\udComparison between the two sites shows that the WWTP did not affect uptake rates, respiration or primary\udproduction of the ecosystem in the low-nutrient Monte´gut reach despite increase of invertebrates communities\udbiomass density. Inputs from the WWTP, in the high nitrate and phosphate Le´zat reach, increased respiration,\udlower benthic biomass and led to changes in the species composition and did not affect uptake rates

Effects of wastewater treatment plant pollution on in-stream ecosystems functions in an agricultural watershed